zoxel.js

// include: shell.js
// The Module object: Our interface to the outside world. We import
// and export values on it. There are various ways Module can be used:
// 1. Not defined. We create it here
// 2. A function parameter, function(Module) { ..generated code.. }
// 3. pre-run appended it, var Module = {}; ..generated code..
// 4. External script tag defines var Module.
// We need to check if Module already exists (e.g. case 3 above).
// Substitution will be replaced with actual code on later stage of the build,
// this way Closure Compiler will not mangle it (e.g. case 4. above).
// Note that if you want to run closure, and also to use Module
// after the generated code, you will need to define   var Module = {};
// before the code. Then that object will be used in the code, and you
// can continue to use Module afterwards as well.
var Module = typeof Module != 'undefined' ? Module : {};

// --pre-jses are emitted after the Module integration code, so that they can
// refer to Module (if they choose; they can also define Module)

  if (!Module.expectedDataFileDownloads) {
    Module.expectedDataFileDownloads = 0;
  }

  Module.expectedDataFileDownloads++;
  (function() {
    // Do not attempt to redownload the virtual filesystem data when in a pthread or a Wasm Worker context.
    if (Module['ENVIRONMENT_IS_PTHREAD'] || Module['$ww']) return;
    var loadPackage = function(metadata) {

      var PACKAGE_PATH = '';
      if (typeof window === 'object') {
        PACKAGE_PATH = window['encodeURIComponent'](window.location.pathname.toString().substring(0, window.location.pathname.toString().lastIndexOf('/')) + '/');
      } else if (typeof process === 'undefined' && typeof location !== 'undefined') {
        // web worker
        PACKAGE_PATH = encodeURIComponent(location.pathname.toString().substring(0, location.pathname.toString().lastIndexOf('/')) + '/');
      }
      var PACKAGE_NAME = 'zoxel.data';
      var REMOTE_PACKAGE_BASE = 'zoxel.data';
      if (typeof Module['locateFilePackage'] === 'function' && !Module['locateFile']) {
        Module['locateFile'] = Module['locateFilePackage'];
        err('warning: you defined Module.locateFilePackage, that has been renamed to Module.locateFile (using your locateFilePackage for now)');
      }
      var REMOTE_PACKAGE_NAME = Module['locateFile'] ? Module['locateFile'](REMOTE_PACKAGE_BASE, '') : REMOTE_PACKAGE_BASE;
var REMOTE_PACKAGE_SIZE = metadata['remote_package_size'];

      function fetchRemotePackage(packageName, packageSize, callback, errback) {
        if (typeof process === 'object' && typeof process.versions === 'object' && typeof process.versions.node === 'string') {
          require('fs').readFile(packageName, function(err, contents) {
            if (err) {
              errback(err);
            } else {
              callback(contents.buffer);
            }
          });
          return;
        }
        var xhr = new XMLHttpRequest();
        xhr.open('GET', packageName, true);
        xhr.responseType = 'arraybuffer';
        xhr.onprogress = function(event) {
          var url = packageName;
          var size = packageSize;
          if (event.total) size = event.total;
          if (event.loaded) {
            if (!xhr.addedTotal) {
              xhr.addedTotal = true;
              if (!Module.dataFileDownloads) Module.dataFileDownloads = {};
              Module.dataFileDownloads[url] = {
                loaded: event.loaded,
                total: size
              };
            } else {
              Module.dataFileDownloads[url].loaded = event.loaded;
            }
            var total = 0;
            var loaded = 0;
            var num = 0;
            for (var download in Module.dataFileDownloads) {
            var data = Module.dataFileDownloads[download];
              total += data.total;
              loaded += data.loaded;
              num++;
            }
            total = Math.ceil(total * Module.expectedDataFileDownloads/num);
            if (Module['setStatus']) Module['setStatus']('Downloading data... (' + loaded + '/' + total + ')');
          } else if (!Module.dataFileDownloads) {
            if (Module['setStatus']) Module['setStatus']('Downloading data...');
          }
        };
        xhr.onerror = function(event) {
          throw new Error("NetworkError for: " + packageName);
        }
        xhr.onload = function(event) {
          if (xhr.status == 200 || xhr.status == 304 || xhr.status == 206 || (xhr.status == 0 && xhr.response)) { // file URLs can return 0
            var packageData = xhr.response;
            callback(packageData);
          } else {
            throw new Error(xhr.statusText + " : " + xhr.responseURL);
          }
        };
        xhr.send(null);
      };

      function handleError(error) {
        console.error('package error:', error);
      };

      var fetchedCallback = null;
      var fetched = Module['getPreloadedPackage'] ? Module['getPreloadedPackage'](REMOTE_PACKAGE_NAME, REMOTE_PACKAGE_SIZE) : null;

      if (!fetched) fetchRemotePackage(REMOTE_PACKAGE_NAME, REMOTE_PACKAGE_SIZE, function(data) {
        if (fetchedCallback) {
          fetchedCallback(data);
          fetchedCallback = null;
        } else {
          fetched = data;
        }
      }, handleError);

    function runWithFS() {

      function assert(check, msg) {
        if (!check) throw msg + new Error().stack;
      }
Module['FS_createPath']("/", "resources", true, true);
Module['FS_createPath']("/resources", "textures", true, true);
Module['FS_createPath']("/resources", "voxes", true, true);
Module['FS_createPath']("/resources/voxes", "monsters", true, true);

      /** @constructor */
      function DataRequest(start, end, audio) {
        this.start = start;
        this.end = end;
        this.audio = audio;
      }
      DataRequest.prototype = {
        requests: {},
        open: function(mode, name) {
          this.name = name;
          this.requests[name] = this;
          Module['addRunDependency']('fp ' + this.name);
        },
        send: function() {},
        onload: function() {
          var byteArray = this.byteArray.subarray(this.start, this.end);
          this.finish(byteArray);
        },
        finish: function(byteArray) {
          var that = this;
          // canOwn this data in the filesystem, it is a slide into the heap that will never change
          Module['FS_createDataFile'](this.name, null, byteArray, true, true, true);
          Module['removeRunDependency']('fp ' + that.name);
          this.requests[this.name] = null;
        }
      };

      var files = metadata['files'];
      for (var i = 0; i < files.length; ++i) {
        new DataRequest(files[i]['start'], files[i]['end'], files[i]['audio'] || 0).open('GET', files[i]['filename']);
      }

      function processPackageData(arrayBuffer) {
        assert(arrayBuffer, 'Loading data file failed.');
        assert(arrayBuffer.constructor.name === ArrayBuffer.name, 'bad input to processPackageData');
        var byteArray = new Uint8Array(arrayBuffer);
        var curr;
        // Reuse the bytearray from the XHR as the source for file reads.
          DataRequest.prototype.byteArray = byteArray;
          var files = metadata['files'];
          for (var i = 0; i < files.length; ++i) {
            DataRequest.prototype.requests[files[i].filename].onload();
          }          Module['removeRunDependency']('datafile_zoxel.data');

      };
      Module['addRunDependency']('datafile_zoxel.data');

      if (!Module.preloadResults) Module.preloadResults = {};

      Module.preloadResults[PACKAGE_NAME] = {fromCache: false};
      if (fetched) {
        processPackageData(fetched);
        fetched = null;
      } else {
        fetchedCallback = processPackageData;
      }

    }
    if (Module['calledRun']) {
      runWithFS();
    } else {
      if (!Module['preRun']) Module['preRun'] = [];
      Module["preRun"].push(runWithFS); // FS is not initialized yet, wait for it
    }

    }
    loadPackage({"files": [{"filename": "/resources/textures/game_icon.png", "start": 0, "end": 2445}, {"filename": "/resources/voxes/monsters/chicken.vox", "start": 2445, "end": 5717}, {"filename": "/resources/voxes/monsters/mrpenguin.vox", "start": 5717, "end": 66721}, {"filename": "/resources/voxes/monsters/slime.vox", "start": 66721, "end": 86169}], "remote_package_size": 86169});

  })();


    // All the pre-js content up to here must remain later on, we need to run
    // it.
    if (Module['ENVIRONMENT_IS_PTHREAD'] || Module['$ww']) Module['preRun'] = [];
    var necessaryPreJSTasks = Module['preRun'].slice();
  

    if (!Module['preRun']) throw 'Module.preRun should exist because file support used it; did a pre-js delete it?';
    necessaryPreJSTasks.forEach(function(task) {
      if (Module['preRun'].indexOf(task) < 0) throw 'All preRun tasks that exist before user pre-js code should remain after; did you replace Module or modify Module.preRun?';
    });
  


// Sometimes an existing Module object exists with properties
// meant to overwrite the default module functionality. Here
// we collect those properties and reapply _after_ we configure
// the current environment's defaults to avoid having to be so
// defensive during initialization.
var moduleOverrides = Object.assign({}, Module);

var arguments_ = [];
var thisProgram = './this.program';
var quit_ = (status, toThrow) => {
  throw toThrow;
};

// Determine the runtime environment we are in. You can customize this by
// setting the ENVIRONMENT setting at compile time (see settings.js).

// Attempt to auto-detect the environment
var ENVIRONMENT_IS_WEB = typeof window == 'object';
var ENVIRONMENT_IS_WORKER = typeof importScripts == 'function';
// N.b. Electron.js environment is simultaneously a NODE-environment, but
// also a web environment.
var ENVIRONMENT_IS_NODE = typeof process == 'object' && typeof process.versions == 'object' && typeof process.versions.node == 'string';
var ENVIRONMENT_IS_SHELL = !ENVIRONMENT_IS_WEB && !ENVIRONMENT_IS_NODE && !ENVIRONMENT_IS_WORKER;

if (Module['ENVIRONMENT']) {
  throw new Error('Module.ENVIRONMENT has been deprecated. To force the environment, use the ENVIRONMENT compile-time option (for example, -sENVIRONMENT=web or -sENVIRONMENT=node)');
}

// `/` should be present at the end if `scriptDirectory` is not empty
var scriptDirectory = '';
function locateFile(path) {
  if (Module['locateFile']) {
    return Module['locateFile'](path, scriptDirectory);
  }
  return scriptDirectory + path;
}

// Hooks that are implemented differently in different runtime environments.
var read_,
    readAsync,
    readBinary,
    setWindowTitle;

if (ENVIRONMENT_IS_NODE) {
  if (typeof process == 'undefined' || !process.release || process.release.name !== 'node') throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');

  var nodeVersion = process.versions.node;
  var numericVersion = nodeVersion.split('.').slice(0, 3);
  numericVersion = (numericVersion[0] * 10000) + (numericVersion[1] * 100) + numericVersion[2] * 1;
  var minVersion = 101900;
  if (numericVersion < 101900) {
    throw new Error('This emscripten-generated code requires node v10.19.19.0 (detected v' + nodeVersion + ')');
  }

  // `require()` is no-op in an ESM module, use `createRequire()` to construct
  // the require()` function.  This is only necessary for multi-environment
  // builds, `-sENVIRONMENT=node` emits a static import declaration instead.
  // TODO: Swap all `require()`'s with `import()`'s?
  // These modules will usually be used on Node.js. Load them eagerly to avoid
  // the complexity of lazy-loading.
  var fs = require('fs');
  var nodePath = require('path');

  if (ENVIRONMENT_IS_WORKER) {
    scriptDirectory = nodePath.dirname(scriptDirectory) + '/';
  } else {
    scriptDirectory = __dirname + '/';
  }

// include: node_shell_read.js
read_ = (filename, binary) => {
  // We need to re-wrap `file://` strings to URLs. Normalizing isn't
  // necessary in that case, the path should already be absolute.
  filename = isFileURI(filename) ? new URL(filename) : nodePath.normalize(filename);
  return fs.readFileSync(filename, binary ? undefined : 'utf8');
};

readBinary = (filename) => {
  var ret = read_(filename, true);
  if (!ret.buffer) {
    ret = new Uint8Array(ret);
  }
  assert(ret.buffer);
  return ret;
};

readAsync = (filename, onload, onerror) => {
  // See the comment in the `read_` function.
  filename = isFileURI(filename) ? new URL(filename) : nodePath.normalize(filename);
  fs.readFile(filename, function(err, data) {
    if (err) onerror(err);
    else onload(data.buffer);
  });
};

// end include: node_shell_read.js
  if (process.argv.length > 1) {
    thisProgram = process.argv[1].replace(/\\/g, '/');
  }

  arguments_ = process.argv.slice(2);

  if (typeof module != 'undefined') {
    module['exports'] = Module;
  }

  process.on('uncaughtException', function(ex) {
    // suppress ExitStatus exceptions from showing an error
    if (ex !== 'unwind' && !(ex instanceof ExitStatus) && !(ex.context instanceof ExitStatus)) {
      throw ex;
    }
  });

  // Without this older versions of node (< v15) will log unhandled rejections
  // but return 0, which is not normally the desired behaviour.  This is
  // not be needed with node v15 and about because it is now the default
  // behaviour:
  // See https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode
  var nodeMajor = process.versions.node.split(".")[0];
  if (nodeMajor < 15) {
    process.on('unhandledRejection', function(reason) { throw reason; });
  }

  quit_ = (status, toThrow) => {
    process.exitCode = status;
    throw toThrow;
  };

  Module['inspect'] = function () { return '[Emscripten Module object]'; };

} else
if (ENVIRONMENT_IS_SHELL) {

  if ((typeof process == 'object' && typeof require === 'function') || typeof window == 'object' || typeof importScripts == 'function') throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');

  if (typeof read != 'undefined') {
    read_ = function shell_read(f) {
      return read(f);
    };
  }

  readBinary = function readBinary(f) {
    let data;
    if (typeof readbuffer == 'function') {
      return new Uint8Array(readbuffer(f));
    }
    data = read(f, 'binary');
    assert(typeof data == 'object');
    return data;
  };

  readAsync = function readAsync(f, onload, onerror) {
    setTimeout(() => onload(readBinary(f)), 0);
  };

  if (typeof clearTimeout == 'undefined') {
    globalThis.clearTimeout = (id) => {};
  }

  if (typeof scriptArgs != 'undefined') {
    arguments_ = scriptArgs;
  } else if (typeof arguments != 'undefined') {
    arguments_ = arguments;
  }

  if (typeof quit == 'function') {
    quit_ = (status, toThrow) => {
      // Unlike node which has process.exitCode, d8 has no such mechanism. So we
      // have no way to set the exit code and then let the program exit with
      // that code when it naturally stops running (say, when all setTimeouts
      // have completed). For that reason, we must call `quit` - the only way to
      // set the exit code - but quit also halts immediately.  To increase
      // consistency with node (and the web) we schedule the actual quit call
      // using a setTimeout to give the current stack and any exception handlers
      // a chance to run.  This enables features such as addOnPostRun (which
      // expected to be able to run code after main returns).
      setTimeout(() => {
        if (!(toThrow instanceof ExitStatus)) {
          let toLog = toThrow;
          if (toThrow && typeof toThrow == 'object' && toThrow.stack) {
            toLog = [toThrow, toThrow.stack];
          }
          err('exiting due to exception: ' + toLog);
        }
        quit(status);
      });
      throw toThrow;
    };
  }

  if (typeof print != 'undefined') {
    // Prefer to use print/printErr where they exist, as they usually work better.
    if (typeof console == 'undefined') console = /** @type{!Console} */({});
    console.log = /** @type{!function(this:Console, ...*): undefined} */ (print);
    console.warn = console.error = /** @type{!function(this:Console, ...*): undefined} */ (typeof printErr != 'undefined' ? printErr : print);
  }

} else

// Note that this includes Node.js workers when relevant (pthreads is enabled).
// Node.js workers are detected as a combination of ENVIRONMENT_IS_WORKER and
// ENVIRONMENT_IS_NODE.
if (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER) {
  if (ENVIRONMENT_IS_WORKER) { // Check worker, not web, since window could be polyfilled
    scriptDirectory = self.location.href;
  } else if (typeof document != 'undefined' && document.currentScript) { // web
    scriptDirectory = document.currentScript.src;
  }
  // blob urls look like blob:http://site.com/etc/etc and we cannot infer anything from them.
  // otherwise, slice off the final part of the url to find the script directory.
  // if scriptDirectory does not contain a slash, lastIndexOf will return -1,
  // and scriptDirectory will correctly be replaced with an empty string.
  // If scriptDirectory contains a query (starting with ?) or a fragment (starting with #),
  // they are removed because they could contain a slash.
  if (scriptDirectory.indexOf('blob:') !== 0) {
    scriptDirectory = scriptDirectory.substr(0, scriptDirectory.replace(/[?#].*/, "").lastIndexOf('/')+1);
  } else {
    scriptDirectory = '';
  }

  if (!(typeof window == 'object' || typeof importScripts == 'function')) throw new Error('not compiled for this environment (did you build to HTML and try to run it not on the web, or set ENVIRONMENT to something - like node - and run it someplace else - like on the web?)');

  // Differentiate the Web Worker from the Node Worker case, as reading must
  // be done differently.
  {
// include: web_or_worker_shell_read.js
read_ = (url) => {
      var xhr = new XMLHttpRequest();
      xhr.open('GET', url, false);
      xhr.send(null);
      return xhr.responseText;
  }

  if (ENVIRONMENT_IS_WORKER) {
    readBinary = (url) => {
        var xhr = new XMLHttpRequest();
        xhr.open('GET', url, false);
        xhr.responseType = 'arraybuffer';
        xhr.send(null);
        return new Uint8Array(/** @type{!ArrayBuffer} */(xhr.response));
    };
  }

  readAsync = (url, onload, onerror) => {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'arraybuffer';
    xhr.onload = () => {
      if (xhr.status == 200 || (xhr.status == 0 && xhr.response)) { // file URLs can return 0
        onload(xhr.response);
        return;
      }
      onerror();
    };
    xhr.onerror = onerror;
    xhr.send(null);
  }

// end include: web_or_worker_shell_read.js
  }

  setWindowTitle = (title) => document.title = title;
} else
{
  throw new Error('environment detection error');
}

var out = Module['print'] || console.log.bind(console);
var err = Module['printErr'] || console.warn.bind(console);

// Merge back in the overrides
Object.assign(Module, moduleOverrides);
// Free the object hierarchy contained in the overrides, this lets the GC
// reclaim data used e.g. in memoryInitializerRequest, which is a large typed array.
moduleOverrides = null;
checkIncomingModuleAPI();

// Emit code to handle expected values on the Module object. This applies Module.x
// to the proper local x. This has two benefits: first, we only emit it if it is
// expected to arrive, and second, by using a local everywhere else that can be
// minified.

if (Module['arguments']) arguments_ = Module['arguments'];legacyModuleProp('arguments', 'arguments_');

if (Module['thisProgram']) thisProgram = Module['thisProgram'];legacyModuleProp('thisProgram', 'thisProgram');

if (Module['quit']) quit_ = Module['quit'];legacyModuleProp('quit', 'quit_');

// perform assertions in shell.js after we set up out() and err(), as otherwise if an assertion fails it cannot print the message
// Assertions on removed incoming Module JS APIs.
assert(typeof Module['memoryInitializerPrefixURL'] == 'undefined', 'Module.memoryInitializerPrefixURL option was removed, use Module.locateFile instead');
assert(typeof Module['pthreadMainPrefixURL'] == 'undefined', 'Module.pthreadMainPrefixURL option was removed, use Module.locateFile instead');
assert(typeof Module['cdInitializerPrefixURL'] == 'undefined', 'Module.cdInitializerPrefixURL option was removed, use Module.locateFile instead');
assert(typeof Module['filePackagePrefixURL'] == 'undefined', 'Module.filePackagePrefixURL option was removed, use Module.locateFile instead');
assert(typeof Module['read'] == 'undefined', 'Module.read option was removed (modify read_ in JS)');
assert(typeof Module['readAsync'] == 'undefined', 'Module.readAsync option was removed (modify readAsync in JS)');
assert(typeof Module['readBinary'] == 'undefined', 'Module.readBinary option was removed (modify readBinary in JS)');
assert(typeof Module['setWindowTitle'] == 'undefined', 'Module.setWindowTitle option was removed (modify setWindowTitle in JS)');
assert(typeof Module['TOTAL_MEMORY'] == 'undefined', 'Module.TOTAL_MEMORY has been renamed Module.INITIAL_MEMORY');
legacyModuleProp('read', 'read_');
legacyModuleProp('readAsync', 'readAsync');
legacyModuleProp('readBinary', 'readBinary');
legacyModuleProp('setWindowTitle', 'setWindowTitle');
var IDBFS = 'IDBFS is no longer included by default; build with -lidbfs.js';
var PROXYFS = 'PROXYFS is no longer included by default; build with -lproxyfs.js';
var WORKERFS = 'WORKERFS is no longer included by default; build with -lworkerfs.js';
var NODEFS = 'NODEFS is no longer included by default; build with -lnodefs.js';

assert(!ENVIRONMENT_IS_SHELL, "shell environment detected but not enabled at build time.  Add 'shell' to `-sENVIRONMENT` to enable.");


// end include: shell.js
// include: preamble.js
// === Preamble library stuff ===

// Documentation for the public APIs defined in this file must be updated in:
//    site/source/docs/api_reference/preamble.js.rst
// A prebuilt local version of the documentation is available at:
//    site/build/text/docs/api_reference/preamble.js.txt
// You can also build docs locally as HTML or other formats in site/
// An online HTML version (which may be of a different version of Emscripten)
//    is up at http://kripken.github.io/emscripten-site/docs/api_reference/preamble.js.html

var wasmBinary;
if (Module['wasmBinary']) wasmBinary = Module['wasmBinary'];legacyModuleProp('wasmBinary', 'wasmBinary');
var noExitRuntime = Module['noExitRuntime'] || true;legacyModuleProp('noExitRuntime', 'noExitRuntime');

if (typeof WebAssembly != 'object') {
  abort('no native wasm support detected');
}

// Wasm globals

var wasmMemory;

//========================================
// Runtime essentials
//========================================

// whether we are quitting the application. no code should run after this.
// set in exit() and abort()
var ABORT = false;

// set by exit() and abort().  Passed to 'onExit' handler.
// NOTE: This is also used as the process return code code in shell environments
// but only when noExitRuntime is false.
var EXITSTATUS;

/** @type {function(*, string=)} */
function assert(condition, text) {
  if (!condition) {
    abort('Assertion failed' + (text ? ': ' + text : ''));
  }
}

// We used to include malloc/free by default in the past. Show a helpful error in
// builds with assertions.

// include: runtime_strings.js
// runtime_strings.js: String related runtime functions that are part of both
// MINIMAL_RUNTIME and regular runtime.

var UTF8Decoder = typeof TextDecoder != 'undefined' ? new TextDecoder('utf8') : undefined;

/**
 * Given a pointer 'idx' to a null-terminated UTF8-encoded string in the given
 * array that contains uint8 values, returns a copy of that string as a
 * Javascript String object.
 * heapOrArray is either a regular array, or a JavaScript typed array view.
 * @param {number} idx
 * @param {number=} maxBytesToRead
 * @return {string}
 */
function UTF8ArrayToString(heapOrArray, idx, maxBytesToRead) {
  var endIdx = idx + maxBytesToRead;
  var endPtr = idx;
  // TextDecoder needs to know the byte length in advance, it doesn't stop on
  // null terminator by itself.  Also, use the length info to avoid running tiny
  // strings through TextDecoder, since .subarray() allocates garbage.
  // (As a tiny code save trick, compare endPtr against endIdx using a negation,
  // so that undefined means Infinity)
  while (heapOrArray[endPtr] && !(endPtr >= endIdx)) ++endPtr;

  if (endPtr - idx > 16 && heapOrArray.buffer && UTF8Decoder) {
    return UTF8Decoder.decode(heapOrArray.subarray(idx, endPtr));
  }
  var str = '';
  // If building with TextDecoder, we have already computed the string length
  // above, so test loop end condition against that
  while (idx < endPtr) {
    // For UTF8 byte structure, see:
    // http://en.wikipedia.org/wiki/UTF-8#Description
    // https://www.ietf.org/rfc/rfc2279.txt
    // https://tools.ietf.org/html/rfc3629
    var u0 = heapOrArray[idx++];
    if (!(u0 & 0x80)) { str += String.fromCharCode(u0); continue; }
    var u1 = heapOrArray[idx++] & 63;
    if ((u0 & 0xE0) == 0xC0) { str += String.fromCharCode(((u0 & 31) << 6) | u1); continue; }
    var u2 = heapOrArray[idx++] & 63;
    if ((u0 & 0xF0) == 0xE0) {
      u0 = ((u0 & 15) << 12) | (u1 << 6) | u2;
    } else {
      if ((u0 & 0xF8) != 0xF0) warnOnce('Invalid UTF-8 leading byte ' + ptrToString(u0) + ' encountered when deserializing a UTF-8 string in wasm memory to a JS string!');
      u0 = ((u0 & 7) << 18) | (u1 << 12) | (u2 << 6) | (heapOrArray[idx++] & 63);
    }

    if (u0 < 0x10000) {
      str += String.fromCharCode(u0);
    } else {
      var ch = u0 - 0x10000;
      str += String.fromCharCode(0xD800 | (ch >> 10), 0xDC00 | (ch & 0x3FF));
    }
  }
  return str;
}

/**
 * Given a pointer 'ptr' to a null-terminated UTF8-encoded string in the
 * emscripten HEAP, returns a copy of that string as a Javascript String object.
 *
 * @param {number} ptr
 * @param {number=} maxBytesToRead - An optional length that specifies the
 *   maximum number of bytes to read. You can omit this parameter to scan the
 *   string until the first \0 byte. If maxBytesToRead is passed, and the string
 *   at [ptr, ptr+maxBytesToReadr[ contains a null byte in the middle, then the
 *   string will cut short at that byte index (i.e. maxBytesToRead will not
 *   produce a string of exact length [ptr, ptr+maxBytesToRead[) N.B. mixing
 *   frequent uses of UTF8ToString() with and without maxBytesToRead may throw
 *   JS JIT optimizations off, so it is worth to consider consistently using one
 * @return {string}
 */
function UTF8ToString(ptr, maxBytesToRead) {
  assert(typeof ptr == 'number');
  return ptr ? UTF8ArrayToString(HEAPU8, ptr, maxBytesToRead) : '';
}

/**
 * Copies the given Javascript String object 'str' to the given byte array at
 * address 'outIdx', encoded in UTF8 form and null-terminated. The copy will
 * require at most str.length*4+1 bytes of space in the HEAP.  Use the function
 * lengthBytesUTF8 to compute the exact number of bytes (excluding null
 * terminator) that this function will write.
 *
 * @param {string} str - The Javascript string to copy.
 * @param {ArrayBufferView|Array<number>} heap - The array to copy to. Each
 *                                               index in this array is assumed
 *                                               to be one 8-byte element.
 * @param {number} outIdx - The starting offset in the array to begin the copying.
 * @param {number} maxBytesToWrite - The maximum number of bytes this function
 *                                   can write to the array.  This count should
 *                                   include the null terminator, i.e. if
 *                                   maxBytesToWrite=1, only the null terminator
 *                                   will be written and nothing else.
 *                                   maxBytesToWrite=0 does not write any bytes
 *                                   to the output, not even the null
 *                                   terminator.
 * @return {number} The number of bytes written, EXCLUDING the null terminator.
 */
function stringToUTF8Array(str, heap, outIdx, maxBytesToWrite) {
  // Parameter maxBytesToWrite is not optional. Negative values, 0, null,
  // undefined and false each don't write out any bytes.
  if (!(maxBytesToWrite > 0))
    return 0;

  var startIdx = outIdx;
  var endIdx = outIdx + maxBytesToWrite - 1; // -1 for string null terminator.
  for (var i = 0; i < str.length; ++i) {
    // Gotcha: charCodeAt returns a 16-bit word that is a UTF-16 encoded code
    // unit, not a Unicode code point of the character! So decode
    // UTF16->UTF32->UTF8.
    // See http://unicode.org/faq/utf_bom.html#utf16-3
    // For UTF8 byte structure, see http://en.wikipedia.org/wiki/UTF-8#Description
    // and https://www.ietf.org/rfc/rfc2279.txt
    // and https://tools.ietf.org/html/rfc3629
    var u = str.charCodeAt(i); // possibly a lead surrogate
    if (u >= 0xD800 && u <= 0xDFFF) {
      var u1 = str.charCodeAt(++i);
      u = 0x10000 + ((u & 0x3FF) << 10) | (u1 & 0x3FF);
    }
    if (u <= 0x7F) {
      if (outIdx >= endIdx) break;
      heap[outIdx++] = u;
    } else if (u <= 0x7FF) {
      if (outIdx + 1 >= endIdx) break;
      heap[outIdx++] = 0xC0 | (u >> 6);
      heap[outIdx++] = 0x80 | (u & 63);
    } else if (u <= 0xFFFF) {
      if (outIdx + 2 >= endIdx) break;
      heap[outIdx++] = 0xE0 | (u >> 12);
      heap[outIdx++] = 0x80 | ((u >> 6) & 63);
      heap[outIdx++] = 0x80 | (u & 63);
    } else {
      if (outIdx + 3 >= endIdx) break;
      if (u > 0x10FFFF) warnOnce('Invalid Unicode code point ' + ptrToString(u) + ' encountered when serializing a JS string to a UTF-8 string in wasm memory! (Valid unicode code points should be in range 0-0x10FFFF).');
      heap[outIdx++] = 0xF0 | (u >> 18);
      heap[outIdx++] = 0x80 | ((u >> 12) & 63);
      heap[outIdx++] = 0x80 | ((u >> 6) & 63);
      heap[outIdx++] = 0x80 | (u & 63);
    }
  }
  // Null-terminate the pointer to the buffer.
  heap[outIdx] = 0;
  return outIdx - startIdx;
}

/**
 * Copies the given Javascript String object 'str' to the emscripten HEAP at
 * address 'outPtr', null-terminated and encoded in UTF8 form. The copy will
 * require at most str.length*4+1 bytes of space in the HEAP.
 * Use the function lengthBytesUTF8 to compute the exact number of bytes
 * (excluding null terminator) that this function will write.
 *
 * @return {number} The number of bytes written, EXCLUDING the null terminator.
 */
function stringToUTF8(str, outPtr, maxBytesToWrite) {
  assert(typeof maxBytesToWrite == 'number', 'stringToUTF8(str, outPtr, maxBytesToWrite) is missing the third parameter that specifies the length of the output buffer!');
  return stringToUTF8Array(str, HEAPU8,outPtr, maxBytesToWrite);
}

/**
 * Returns the number of bytes the given Javascript string takes if encoded as a
 * UTF8 byte array, EXCLUDING the null terminator byte.
 *
 * @param {string} str - JavaScript string to operator on
 * @return {number} Length, in bytes, of the UTF8 encoded string.
 */
function lengthBytesUTF8(str) {
  var len = 0;
  for (var i = 0; i < str.length; ++i) {
    // Gotcha: charCodeAt returns a 16-bit word that is a UTF-16 encoded code
    // unit, not a Unicode code point of the character! So decode
    // UTF16->UTF32->UTF8.
    // See http://unicode.org/faq/utf_bom.html#utf16-3
    var c = str.charCodeAt(i); // possibly a lead surrogate
    if (c <= 0x7F) {
      len++;
    } else if (c <= 0x7FF) {
      len += 2;
    } else if (c >= 0xD800 && c <= 0xDFFF) {
      len += 4; ++i;
    } else {
      len += 3;
    }
  }
  return len;
}

// end include: runtime_strings.js
// Memory management

var HEAP,
/** @type {!Int8Array} */
  HEAP8,
/** @type {!Uint8Array} */
  HEAPU8,
/** @type {!Int16Array} */
  HEAP16,
/** @type {!Uint16Array} */
  HEAPU16,
/** @type {!Int32Array} */
  HEAP32,
/** @type {!Uint32Array} */
  HEAPU32,
/** @type {!Float32Array} */
  HEAPF32,
/** @type {!Float64Array} */
  HEAPF64;

function updateMemoryViews() {
  var b = wasmMemory.buffer;
  Module['HEAP8'] = HEAP8 = new Int8Array(b);
  Module['HEAP16'] = HEAP16 = new Int16Array(b);
  Module['HEAP32'] = HEAP32 = new Int32Array(b);
  Module['HEAPU8'] = HEAPU8 = new Uint8Array(b);
  Module['HEAPU16'] = HEAPU16 = new Uint16Array(b);
  Module['HEAPU32'] = HEAPU32 = new Uint32Array(b);
  Module['HEAPF32'] = HEAPF32 = new Float32Array(b);
  Module['HEAPF64'] = HEAPF64 = new Float64Array(b);
}

assert(!Module['STACK_SIZE'], 'STACK_SIZE can no longer be set at runtime.  Use -sSTACK_SIZE at link time')

assert(typeof Int32Array != 'undefined' && typeof Float64Array !== 'undefined' && Int32Array.prototype.subarray != undefined && Int32Array.prototype.set != undefined,
       'JS engine does not provide full typed array support');

// If memory is defined in wasm, the user can't provide it, or set INITIAL_MEMORY
assert(!Module['wasmMemory'], 'Use of `wasmMemory` detected.  Use -sIMPORTED_MEMORY to define wasmMemory externally');
assert(!Module['INITIAL_MEMORY'], 'Detected runtime INITIAL_MEMORY setting.  Use -sIMPORTED_MEMORY to define wasmMemory dynamically');

// include: runtime_init_table.js
// In regular non-RELOCATABLE mode the table is exported
// from the wasm module and this will be assigned once
// the exports are available.
var wasmTable;

// end include: runtime_init_table.js
// include: runtime_stack_check.js
// Initializes the stack cookie. Called at the startup of main and at the startup of each thread in pthreads mode.
function writeStackCookie() {
  var max = _emscripten_stack_get_end();
  assert((max & 3) == 0);
  // If the stack ends at address zero we write our cookies 4 bytes into the
  // stack.  This prevents interference with the (separate) address-zero check
  // below.
  if (max == 0) {
    max += 4;
  }
  // The stack grow downwards towards _emscripten_stack_get_end.
  // We write cookies to the final two words in the stack and detect if they are
  // ever overwritten.
  HEAPU32[((max)>>2)] = 0x02135467;
  HEAPU32[(((max)+(4))>>2)] = 0x89BACDFE;
  // Also test the global address 0 for integrity.
  HEAPU32[0] = 0x63736d65; /* 'emsc' */
}

function checkStackCookie() {
  if (ABORT) return;
  var max = _emscripten_stack_get_end();
  // See writeStackCookie().
  if (max == 0) {
    max += 4;
  }
  var cookie1 = HEAPU32[((max)>>2)];
  var cookie2 = HEAPU32[(((max)+(4))>>2)];
  if (cookie1 != 0x02135467 || cookie2 != 0x89BACDFE) {
    abort('Stack overflow! Stack cookie has been overwritten at ' + ptrToString(max) + ', expected hex dwords 0x89BACDFE and 0x2135467, but received ' + ptrToString(cookie2) + ' ' + ptrToString(cookie1));
  }
  // Also test the global address 0 for integrity.
  if (HEAPU32[0] !== 0x63736d65 /* 'emsc' */) {
    abort('Runtime error: The application has corrupted its heap memory area (address zero)!');
  }
}

// end include: runtime_stack_check.js
// include: runtime_assertions.js
// Endianness check
(function() {
  var h16 = new Int16Array(1);
  var h8 = new Int8Array(h16.buffer);
  h16[0] = 0x6373;
  if (h8[0] !== 0x73 || h8[1] !== 0x63) throw 'Runtime error: expected the system to be little-endian! (Run with -sSUPPORT_BIG_ENDIAN to bypass)';
})();

// end include: runtime_assertions.js
var __ATPRERUN__  = []; // functions called before the runtime is initialized
var __ATINIT__    = []; // functions called during startup
var __ATMAIN__    = []; // functions called when main() is to be run
var __ATEXIT__    = []; // functions called during shutdown
var __ATPOSTRUN__ = []; // functions called after the main() is called

var runtimeInitialized = false;

var runtimeKeepaliveCounter = 0;

function keepRuntimeAlive() {
  return noExitRuntime || runtimeKeepaliveCounter > 0;
}

function preRun() {
  if (Module['preRun']) {
    if (typeof Module['preRun'] == 'function') Module['preRun'] = [Module['preRun']];
    while (Module['preRun'].length) {
      addOnPreRun(Module['preRun'].shift());
    }
  }
  callRuntimeCallbacks(__ATPRERUN__);
}

function initRuntime() {
  assert(!runtimeInitialized);
  runtimeInitialized = true;

  checkStackCookie();

  
if (!Module["noFSInit"] && !FS.init.initialized)
  FS.init();
FS.ignorePermissions = false;

TTY.init();
SOCKFS.root = FS.mount(SOCKFS, {}, null);
  callRuntimeCallbacks(__ATINIT__);
}

function preMain() {
  checkStackCookie();
  
  callRuntimeCallbacks(__ATMAIN__);
}

function postRun() {
  checkStackCookie();

  if (Module['postRun']) {
    if (typeof Module['postRun'] == 'function') Module['postRun'] = [Module['postRun']];
    while (Module['postRun'].length) {
      addOnPostRun(Module['postRun'].shift());
    }
  }

  callRuntimeCallbacks(__ATPOSTRUN__);
}

function addOnPreRun(cb) {
  __ATPRERUN__.unshift(cb);
}

function addOnInit(cb) {
  __ATINIT__.unshift(cb);
}

function addOnPreMain(cb) {
  __ATMAIN__.unshift(cb);
}

function addOnExit(cb) {
}

function addOnPostRun(cb) {
  __ATPOSTRUN__.unshift(cb);
}

// include: runtime_math.js
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/imul

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/fround

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/clz32

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc

assert(Math.imul, 'This browser does not support Math.imul(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill');
assert(Math.fround, 'This browser does not support Math.fround(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill');
assert(Math.clz32, 'This browser does not support Math.clz32(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill');
assert(Math.trunc, 'This browser does not support Math.trunc(), build with LEGACY_VM_SUPPORT or POLYFILL_OLD_MATH_FUNCTIONS to add in a polyfill');

// end include: runtime_math.js
// A counter of dependencies for calling run(). If we need to
// do asynchronous work before running, increment this and
// decrement it. Incrementing must happen in a place like
// Module.preRun (used by emcc to add file preloading).
// Note that you can add dependencies in preRun, even though
// it happens right before run - run will be postponed until
// the dependencies are met.
var runDependencies = 0;
var runDependencyWatcher = null;
var dependenciesFulfilled = null; // overridden to take different actions when all run dependencies are fulfilled
var runDependencyTracking = {};

function getUniqueRunDependency(id) {
  var orig = id;
  while (1) {
    if (!runDependencyTracking[id]) return id;
    id = orig + Math.random();
  }
}

function addRunDependency(id) {
  runDependencies++;

  if (Module['monitorRunDependencies']) {
    Module['monitorRunDependencies'](runDependencies);
  }

  if (id) {
    assert(!runDependencyTracking[id]);
    runDependencyTracking[id] = 1;
    if (runDependencyWatcher === null && typeof setInterval != 'undefined') {
      // Check for missing dependencies every few seconds
      runDependencyWatcher = setInterval(function() {
        if (ABORT) {
          clearInterval(runDependencyWatcher);
          runDependencyWatcher = null;
          return;
        }
        var shown = false;
        for (var dep in runDependencyTracking) {
          if (!shown) {
            shown = true;
            err('still waiting on run dependencies:');
          }
          err('dependency: ' + dep);
        }
        if (shown) {
          err('(end of list)');
        }
      }, 10000);
    }
  } else {
    err('warning: run dependency added without ID');
  }
}

function removeRunDependency(id) {
  runDependencies--;

  if (Module['monitorRunDependencies']) {
    Module['monitorRunDependencies'](runDependencies);
  }

  if (id) {
    assert(runDependencyTracking[id]);
    delete runDependencyTracking[id];
  } else {
    err('warning: run dependency removed without ID');
  }
  if (runDependencies == 0) {
    if (runDependencyWatcher !== null) {
      clearInterval(runDependencyWatcher);
      runDependencyWatcher = null;
    }
    if (dependenciesFulfilled) {
      var callback = dependenciesFulfilled;
      dependenciesFulfilled = null;
      callback(); // can add another dependenciesFulfilled
    }
  }
}

/** @param {string|number=} what */
function abort(what) {
  if (Module['onAbort']) {
    Module['onAbort'](what);
  }

  what = 'Aborted(' + what + ')';
  // TODO(sbc): Should we remove printing and leave it up to whoever
  // catches the exception?
  err(what);

  ABORT = true;
  EXITSTATUS = 1;

  // Use a wasm runtime error, because a JS error might be seen as a foreign
  // exception, which means we'd run destructors on it. We need the error to
  // simply make the program stop.
  // FIXME This approach does not work in Wasm EH because it currently does not assume
  // all RuntimeErrors are from traps; it decides whether a RuntimeError is from
  // a trap or not based on a hidden field within the object. So at the moment
  // we don't have a way of throwing a wasm trap from JS. TODO Make a JS API that
  // allows this in the wasm spec.

  // Suppress closure compiler warning here. Closure compiler's builtin extern
  // defintion for WebAssembly.RuntimeError claims it takes no arguments even
  // though it can.
  // TODO(https://github.com/google/closure-compiler/pull/3913): Remove if/when upstream closure gets fixed.
  /** @suppress {checkTypes} */
  var e = new WebAssembly.RuntimeError(what);

  // Throw the error whether or not MODULARIZE is set because abort is used
  // in code paths apart from instantiation where an exception is expected
  // to be thrown when abort is called.
  throw e;
}

// include: memoryprofiler.js
// end include: memoryprofiler.js
// include: URIUtils.js
// Prefix of data URIs emitted by SINGLE_FILE and related options.
var dataURIPrefix = 'data:application/octet-stream;base64,';

// Indicates whether filename is a base64 data URI.
function isDataURI(filename) {
  // Prefix of data URIs emitted by SINGLE_FILE and related options.
  return filename.startsWith(dataURIPrefix);
}

// Indicates whether filename is delivered via file protocol (as opposed to http/https)
function isFileURI(filename) {
  return filename.startsWith('file://');
}

// end include: URIUtils.js
/** @param {boolean=} fixedasm */
function createExportWrapper(name, fixedasm) {
  return function() {
    var displayName = name;
    var asm = fixedasm;
    if (!fixedasm) {
      asm = Module['asm'];
    }
    assert(runtimeInitialized, 'native function `' + displayName + '` called before runtime initialization');
    if (!asm[name]) {
      assert(asm[name], 'exported native function `' + displayName + '` not found');
    }
    return asm[name].apply(null, arguments);
  };
}

// include: runtime_exceptions.js
// end include: runtime_exceptions.js
var wasmBinaryFile;
  wasmBinaryFile = 'zoxel.wasm';
  if (!isDataURI(wasmBinaryFile)) {
    wasmBinaryFile = locateFile(wasmBinaryFile);
  }

function getBinary(file) {
  try {
    if (file == wasmBinaryFile && wasmBinary) {
      return new Uint8Array(wasmBinary);
    }
    if (readBinary) {
      return readBinary(file);
    }
    throw "both async and sync fetching of the wasm failed";
  }
  catch (err) {
    abort(err);
  }
}

function getBinaryPromise(binaryFile) {
  // If we don't have the binary yet, try to to load it asynchronously.
  // Fetch has some additional restrictions over XHR, like it can't be used on a file:// url.
  // See https://github.com/github/fetch/pull/92#issuecomment-140665932
  // Cordova or Electron apps are typically loaded from a file:// url.
  // So use fetch if it is available and the url is not a file, otherwise fall back to XHR.
  if (!wasmBinary && (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER)) {
    if (typeof fetch == 'function'
      && !isFileURI(binaryFile)
    ) {
      return fetch(binaryFile, { credentials: 'same-origin' }).then(function(response) {
        if (!response['ok']) {
          throw "failed to load wasm binary file at '" + binaryFile + "'";
        }
        return response['arrayBuffer']();
      }).catch(function () {
          return getBinary(binaryFile);
      });
    }
    else {
      if (readAsync) {
        // fetch is not available or url is file => try XHR (readAsync uses XHR internally)
        return new Promise(function(resolve, reject) {
          readAsync(binaryFile, function(response) { resolve(new Uint8Array(/** @type{!ArrayBuffer} */(response))) }, reject)
        });
      }
    }
  }

  // Otherwise, getBinary should be able to get it synchronously
  return Promise.resolve().then(function() { return getBinary(binaryFile); });
}

function instantiateArrayBuffer(binaryFile, imports, receiver) {
  return getBinaryPromise(binaryFile).then(function(binary) {
    return WebAssembly.instantiate(binary, imports);
  }).then(function (instance) {
    return instance;
  }).then(receiver, function(reason) {
    err('failed to asynchronously prepare wasm: ' + reason);

    // Warn on some common problems.
    if (isFileURI(wasmBinaryFile)) {
      err('warning: Loading from a file URI (' + wasmBinaryFile + ') is not supported in most browsers. See https://emscripten.org/docs/getting_started/FAQ.html#how-do-i-run-a-local-webserver-for-testing-why-does-my-program-stall-in-downloading-or-preparing');
    }
    abort(reason);
  });
}

function instantiateAsync(binary, binaryFile, imports, callback) {
  if (!binary &&
      typeof WebAssembly.instantiateStreaming == 'function' &&
      !isDataURI(binaryFile) &&
      // Don't use streaming for file:// delivered objects in a webview, fetch them synchronously.
      !isFileURI(binaryFile) &&
      // Avoid instantiateStreaming() on Node.js environment for now, as while
      // Node.js v18.1.0 implements it, it does not have a full fetch()
      // implementation yet.
      //
      // Reference:
      //   https://github.com/emscripten-core/emscripten/pull/16917
      !ENVIRONMENT_IS_NODE &&
      typeof fetch == 'function') {
    return fetch(binaryFile, { credentials: 'same-origin' }).then(function(response) {
      // Suppress closure warning here since the upstream definition for
      // instantiateStreaming only allows Promise<Repsponse> rather than
      // an actual Response.
      // TODO(https://github.com/google/closure-compiler/pull/3913): Remove if/when upstream closure is fixed.
      /** @suppress {checkTypes} */
      var result = WebAssembly.instantiateStreaming(response, imports);

      return result.then(
        callback,
        function(reason) {
          // We expect the most common failure cause to be a bad MIME type for the binary,
          // in which case falling back to ArrayBuffer instantiation should work.
          err('wasm streaming compile failed: ' + reason);
          err('falling back to ArrayBuffer instantiation');
          return instantiateArrayBuffer(binaryFile, imports, callback);
        });
    });
  } else {
    return instantiateArrayBuffer(binaryFile, imports, callback);
  }
}

// Create the wasm instance.
// Receives the wasm imports, returns the exports.
function createWasm() {
  // prepare imports
  var info = {
    'env': wasmImports,
    'wasi_snapshot_preview1': wasmImports,
  };
  // Load the wasm module and create an instance of using native support in the JS engine.
  // handle a generated wasm instance, receiving its exports and
  // performing other necessary setup
  /** @param {WebAssembly.Module=} module*/
  function receiveInstance(instance, module) {
    var exports = instance.exports;

    Module['asm'] = exports;

    wasmMemory = Module['asm']['memory'];
    assert(wasmMemory, "memory not found in wasm exports");
    // This assertion doesn't hold when emscripten is run in --post-link
    // mode.
    // TODO(sbc): Read INITIAL_MEMORY out of the wasm file in post-link mode.
    //assert(wasmMemory.buffer.byteLength === 16777216);
    updateMemoryViews();

    wasmTable = Module['asm']['__indirect_function_table'];
    assert(wasmTable, "table not found in wasm exports");

    addOnInit(Module['asm']['__wasm_call_ctors']);

    removeRunDependency('wasm-instantiate');

    return exports;
  }
  // wait for the pthread pool (if any)
  addRunDependency('wasm-instantiate');

  // Prefer streaming instantiation if available.
  // Async compilation can be confusing when an error on the page overwrites Module
  // (for example, if the order of elements is wrong, and the one defining Module is
  // later), so we save Module and check it later.
  var trueModule = Module;
  function receiveInstantiationResult(result) {
    // 'result' is a ResultObject object which has both the module and instance.
    // receiveInstance() will swap in the exports (to Module.asm) so they can be called
    assert(Module === trueModule, 'the Module object should not be replaced during async compilation - perhaps the order of HTML elements is wrong?');
    trueModule = null;
    // TODO: Due to Closure regression https://github.com/google/closure-compiler/issues/3193, the above line no longer optimizes out down to the following line.
    // When the regression is fixed, can restore the above PTHREADS-enabled path.
    receiveInstance(result['instance']);
  }

  // User shell pages can write their own Module.instantiateWasm = function(imports, successCallback) callback
  // to manually instantiate the Wasm module themselves. This allows pages to run the instantiation parallel
  // to any other async startup actions they are performing.
  // Also pthreads and wasm workers initialize the wasm instance through this path.
  if (Module['instantiateWasm']) {
    try {
      return Module['instantiateWasm'](info, receiveInstance);
    } catch(e) {
      err('Module.instantiateWasm callback failed with error: ' + e);
        return false;
    }
  }

  instantiateAsync(wasmBinary, wasmBinaryFile, info, receiveInstantiationResult);
  return {}; // no exports yet; we'll fill them in later
}

// Globals used by JS i64 conversions (see makeSetValue)
var tempDouble;
var tempI64;

// include: runtime_debug.js
function legacyModuleProp(prop, newName) {
  if (!Object.getOwnPropertyDescriptor(Module, prop)) {
    Object.defineProperty(Module, prop, {
      configurable: true,
      get: function() {
        abort('Module.' + prop + ' has been replaced with plain ' + newName + ' (the initial value can be provided on Module, but after startup the value is only looked for on a local variable of that name)');
      }
    });
  }
}

function ignoredModuleProp(prop) {
  if (Object.getOwnPropertyDescriptor(Module, prop)) {
    abort('`Module.' + prop + '` was supplied but `' + prop + '` not included in INCOMING_MODULE_JS_API');
  }
}

// forcing the filesystem exports a few things by default
function isExportedByForceFilesystem(name) {
  return name === 'FS_createPath' ||
         name === 'FS_createDataFile' ||
         name === 'FS_createPreloadedFile' ||
         name === 'FS_unlink' ||
         name === 'addRunDependency' ||
         // The old FS has some functionality that WasmFS lacks.
         name === 'FS_createLazyFile' ||
         name === 'FS_createDevice' ||
         name === 'removeRunDependency';
}

function missingGlobal(sym, msg) {
  if (typeof globalThis !== 'undefined') {
    Object.defineProperty(globalThis, sym, {
      configurable: true,
      get: function() {
        warnOnce('`' + sym + '` is not longer defined by emscripten. ' + msg);
        return undefined;
      }
    });
  }
}

missingGlobal('buffer', 'Please use HEAP8.buffer or wasmMemory.buffer');

function missingLibrarySymbol(sym) {
  if (typeof globalThis !== 'undefined' && !Object.getOwnPropertyDescriptor(globalThis, sym)) {
    Object.defineProperty(globalThis, sym, {
      configurable: true,
      get: function() {
        // Can't `abort()` here because it would break code that does runtime
        // checks.  e.g. `if (typeof SDL === 'undefined')`.
        var msg = '`' + sym + '` is a library symbol and not included by default; add it to your library.js __deps or to DEFAULT_LIBRARY_FUNCS_TO_INCLUDE on the command line';
        // DEFAULT_LIBRARY_FUNCS_TO_INCLUDE requires the name as it appears in
        // library.js, which means $name for a JS name with no prefix, or name
        // for a JS name like _name.
        var librarySymbol = sym;
        if (!librarySymbol.startsWith('_')) {
          librarySymbol = '$' + sym;
        }
        msg += " (e.g. -sDEFAULT_LIBRARY_FUNCS_TO_INCLUDE=" + librarySymbol + ")";
        if (isExportedByForceFilesystem(sym)) {
          msg += '. Alternatively, forcing filesystem support (-sFORCE_FILESYSTEM) can export this for you';
        }
        warnOnce(msg);
        return undefined;
      }
    });
  }
  // Any symbol that is not included from the JS libary is also (by definition)
  // not exported on the Module object.
  unexportedRuntimeSymbol(sym);
}

function unexportedRuntimeSymbol(sym) {
  if (!Object.getOwnPropertyDescriptor(Module, sym)) {
    Object.defineProperty(Module, sym, {
      configurable: true,
      get: function() {
        var msg = "'" + sym + "' was not exported. add it to EXPORTED_RUNTIME_METHODS (see the FAQ)";
        if (isExportedByForceFilesystem(sym)) {
          msg += '. Alternatively, forcing filesystem support (-sFORCE_FILESYSTEM) can export this for you';
        }
        abort(msg);
      }
    });
  }
}

// Used by XXXXX_DEBUG settings to output debug messages.
function dbg(text) {
  // TODO(sbc): Make this configurable somehow.  Its not always convenient for
  // logging to show up as errors.
  console.error(text);
}

// end include: runtime_debug.js
// === Body ===

var ASM_CONSTS = {
  631529: ($0) => { var str = UTF8ToString($0) + '\n\n' + 'Abort/Retry/Ignore/AlwaysIgnore? [ariA] :'; var reply = window.prompt(str, "i"); if (reply === null) { reply = "i"; } return allocate(intArrayFromString(reply), 'i8', ALLOC_NORMAL); },  
 631754: () => { if (typeof(AudioContext) !== 'undefined') { return true; } else if (typeof(webkitAudioContext) !== 'undefined') { return true; } return false; },  
 631901: () => { if ((typeof(navigator.mediaDevices) !== 'undefined') && (typeof(navigator.mediaDevices.getUserMedia) !== 'undefined')) { return true; } else if (typeof(navigator.webkitGetUserMedia) !== 'undefined') { return true; } return false; },  
 632135: ($0) => { if(typeof(Module['SDL2']) === 'undefined') { Module['SDL2'] = {}; } var SDL2 = Module['SDL2']; if (!$0) { SDL2.audio = {}; } else { SDL2.capture = {}; } if (!SDL2.audioContext) { if (typeof(AudioContext) !== 'undefined') { SDL2.audioContext = new AudioContext(); } else if (typeof(webkitAudioContext) !== 'undefined') { SDL2.audioContext = new webkitAudioContext(); } if (SDL2.audioContext) { autoResumeAudioContext(SDL2.audioContext); } } return SDL2.audioContext === undefined ? -1 : 0; },  
 632628: () => { var SDL2 = Module['SDL2']; return SDL2.audioContext.sampleRate; },  
 632696: ($0, $1, $2, $3) => { var SDL2 = Module['SDL2']; var have_microphone = function(stream) { if (SDL2.capture.silenceTimer !== undefined) { clearTimeout(SDL2.capture.silenceTimer); SDL2.capture.silenceTimer = undefined; } SDL2.capture.mediaStreamNode = SDL2.audioContext.createMediaStreamSource(stream); SDL2.capture.scriptProcessorNode = SDL2.audioContext.createScriptProcessor($1, $0, 1); SDL2.capture.scriptProcessorNode.onaudioprocess = function(audioProcessingEvent) { if ((SDL2 === undefined) || (SDL2.capture === undefined)) { return; } audioProcessingEvent.outputBuffer.getChannelData(0).fill(0.0); SDL2.capture.currentCaptureBuffer = audioProcessingEvent.inputBuffer; dynCall('vi', $2, [$3]); }; SDL2.capture.mediaStreamNode.connect(SDL2.capture.scriptProcessorNode); SDL2.capture.scriptProcessorNode.connect(SDL2.audioContext.destination); SDL2.capture.stream = stream; }; var no_microphone = function(error) { }; SDL2.capture.silenceBuffer = SDL2.audioContext.createBuffer($0, $1, SDL2.audioContext.sampleRate); SDL2.capture.silenceBuffer.getChannelData(0).fill(0.0); var silence_callback = function() { SDL2.capture.currentCaptureBuffer = SDL2.capture.silenceBuffer; dynCall('vi', $2, [$3]); }; SDL2.capture.silenceTimer = setTimeout(silence_callback, ($1 / SDL2.audioContext.sampleRate) * 1000); if ((navigator.mediaDevices !== undefined) && (navigator.mediaDevices.getUserMedia !== undefined)) { navigator.mediaDevices.getUserMedia({ audio: true, video: false }).then(have_microphone).catch(no_microphone); } else if (navigator.webkitGetUserMedia !== undefined) { navigator.webkitGetUserMedia({ audio: true, video: false }, have_microphone, no_microphone); } },  
 634348: ($0, $1, $2, $3) => { var SDL2 = Module['SDL2']; SDL2.audio.scriptProcessorNode = SDL2.audioContext['createScriptProcessor']($1, 0, $0); SDL2.audio.scriptProcessorNode['onaudioprocess'] = function (e) { if ((SDL2 === undefined) || (SDL2.audio === undefined)) { return; } SDL2.audio.currentOutputBuffer = e['outputBuffer']; dynCall('vi', $2, [$3]); }; SDL2.audio.scriptProcessorNode['connect'](SDL2.audioContext['destination']); },  
 634758: ($0, $1) => { var SDL2 = Module['SDL2']; var numChannels = SDL2.capture.currentCaptureBuffer.numberOfChannels; for (var c = 0; c < numChannels; ++c) { var channelData = SDL2.capture.currentCaptureBuffer.getChannelData(c); if (channelData.length != $1) { throw 'Web Audio capture buffer length mismatch! Destination size: ' + channelData.length + ' samples vs expected ' + $1 + ' samples!'; } if (numChannels == 1) { for (var j = 0; j < $1; ++j) { setValue($0 + (j * 4), channelData[j], 'float'); } } else { for (var j = 0; j < $1; ++j) { setValue($0 + (((j * numChannels) + c) * 4), channelData[j], 'float'); } } } },  
 635363: ($0, $1) => { var SDL2 = Module['SDL2']; var numChannels = SDL2.audio.currentOutputBuffer['numberOfChannels']; for (var c = 0; c < numChannels; ++c) { var channelData = SDL2.audio.currentOutputBuffer['getChannelData'](c); if (channelData.length != $1) { throw 'Web Audio output buffer length mismatch! Destination size: ' + channelData.length + ' samples vs expected ' + $1 + ' samples!'; } for (var j = 0; j < $1; ++j) { channelData[j] = HEAPF32[$0 + ((j*numChannels + c) << 2) >> 2]; } } },  
 635843: ($0) => { var SDL2 = Module['SDL2']; if ($0) { if (SDL2.capture.silenceTimer !== undefined) { clearTimeout(SDL2.capture.silenceTimer); } if (SDL2.capture.stream !== undefined) { var tracks = SDL2.capture.stream.getAudioTracks(); for (var i = 0; i < tracks.length; i++) { SDL2.capture.stream.removeTrack(tracks[i]); } SDL2.capture.stream = undefined; } if (SDL2.capture.scriptProcessorNode !== undefined) { SDL2.capture.scriptProcessorNode.onaudioprocess = function(audioProcessingEvent) {}; SDL2.capture.scriptProcessorNode.disconnect(); SDL2.capture.scriptProcessorNode = undefined; } if (SDL2.capture.mediaStreamNode !== undefined) { SDL2.capture.mediaStreamNode.disconnect(); SDL2.capture.mediaStreamNode = undefined; } if (SDL2.capture.silenceBuffer !== undefined) { SDL2.capture.silenceBuffer = undefined } SDL2.capture = undefined; } else { if (SDL2.audio.scriptProcessorNode != undefined) { SDL2.audio.scriptProcessorNode.disconnect(); SDL2.audio.scriptProcessorNode = undefined; } SDL2.audio = undefined; } if ((SDL2.audioContext !== undefined) && (SDL2.audio === undefined) && (SDL2.capture === undefined)) { SDL2.audioContext.close(); SDL2.audioContext = undefined; } },  
 637015: ($0, $1, $2) => { var w = $0; var h = $1; var pixels = $2; if (!Module['SDL2']) Module['SDL2'] = {}; var SDL2 = Module['SDL2']; if (SDL2.ctxCanvas !== Module['canvas']) { SDL2.ctx = Module['createContext'](Module['canvas'], false, true); SDL2.ctxCanvas = Module['canvas']; } if (SDL2.w !== w || SDL2.h !== h || SDL2.imageCtx !== SDL2.ctx) { SDL2.image = SDL2.ctx.createImageData(w, h); SDL2.w = w; SDL2.h = h; SDL2.imageCtx = SDL2.ctx; } var data = SDL2.image.data; var src = pixels >> 2; var dst = 0; var num; if (typeof CanvasPixelArray !== 'undefined' && data instanceof CanvasPixelArray) { num = data.length; while (dst < num) { var val = HEAP32[src]; data[dst ] = val & 0xff; data[dst+1] = (val >> 8) & 0xff; data[dst+2] = (val >> 16) & 0xff; data[dst+3] = 0xff; src++; dst += 4; } } else { if (SDL2.data32Data !== data) { SDL2.data32 = new Int32Array(data.buffer); SDL2.data8 = new Uint8Array(data.buffer); SDL2.data32Data = data; } var data32 = SDL2.data32; num = data32.length; data32.set(HEAP32.subarray(src, src + num)); var data8 = SDL2.data8; var i = 3; var j = i + 4*num; if (num % 8 == 0) { while (i < j) { data8[i] = 0xff; i = i + 4 | 0; data8[i] = 0xff; i = i + 4 | 0; data8[i] = 0xff; i = i + 4 | 0; data8[i] = 0xff; i = i + 4 | 0; data8[i] = 0xff; i = i + 4 | 0; data8[i] = 0xff; i = i + 4 | 0; data8[i] = 0xff; i = i + 4 | 0; data8[i] = 0xff; i = i + 4 | 0; } } else { while (i < j) { data8[i] = 0xff; i = i + 4 | 0; } } } SDL2.ctx.putImageData(SDL2.image, 0, 0); },  
 638484: ($0, $1, $2, $3, $4) => { var w = $0; var h = $1; var hot_x = $2; var hot_y = $3; var pixels = $4; var canvas = document.createElement("canvas"); canvas.width = w; canvas.height = h; var ctx = canvas.getContext("2d"); var image = ctx.createImageData(w, h); var data = image.data; var src = pixels >> 2; var dst = 0; var num; if (typeof CanvasPixelArray !== 'undefined' && data instanceof CanvasPixelArray) { num = data.length; while (dst < num) { var val = HEAP32[src]; data[dst ] = val & 0xff; data[dst+1] = (val >> 8) & 0xff; data[dst+2] = (val >> 16) & 0xff; data[dst+3] = (val >> 24) & 0xff; src++; dst += 4; } } else { var data32 = new Int32Array(data.buffer); num = data32.length; data32.set(HEAP32.subarray(src, src + num)); } ctx.putImageData(image, 0, 0); var url = hot_x === 0 && hot_y === 0 ? "url(" + canvas.toDataURL() + "), auto" : "url(" + canvas.toDataURL() + ") " + hot_x + " " + hot_y + ", auto"; var urlBuf = _malloc(url.length + 1); stringToUTF8(url, urlBuf, url.length + 1); return urlBuf; },  
 639473: ($0) => { if (Module['canvas']) { Module['canvas'].style['cursor'] = UTF8ToString($0); } },  
 639556: () => { if (Module['canvas']) { Module['canvas'].style['cursor'] = 'none'; } },  
 639625: () => { return window.innerWidth; },  
 639655: () => { return window.innerHeight; }
};
function get_canvas_width() { return window.innerWidth; }
function get_canvas_height() { return window.innerHeight; }



// end include: preamble.js

  /** @constructor */
  function ExitStatus(status) {
      this.name = 'ExitStatus';
      this.message = 'Program terminated with exit(' + status + ')';
      this.status = status;
    }

  function listenOnce(object, event, func) {
      object.addEventListener(event, func, { 'once': true });
    }
  /** @param {Object=} elements */
  function autoResumeAudioContext(ctx, elements) {
      if (!elements) {
        elements = [document, document.getElementById('canvas')];
      }
      ['keydown', 'mousedown', 'touchstart'].forEach(function(event) {
        elements.forEach(function(element) {
          if (element) {
            listenOnce(element, event, () => {
              if (ctx.state === 'suspended') ctx.resume();
            });
          }
        });
      });
    }

  function callRuntimeCallbacks(callbacks) {
      while (callbacks.length > 0) {
        // Pass the module as the first argument.
        callbacks.shift()(Module);
      }
    }

  function dynCallLegacy(sig, ptr, args) {
      assert(('dynCall_' + sig) in Module, 'bad function pointer type - dynCall function not found for sig \'' + sig + '\'');
      if (args && args.length) {
        // j (64-bit integer) must be passed in as two numbers [low 32, high 32].
        assert(args.length === sig.substring(1).replace(/j/g, '--').length);
      } else {
        assert(sig.length == 1);
      }
      var f = Module['dynCall_' + sig];
      return args && args.length ? f.apply(null, [ptr].concat(args)) : f.call(null, ptr);
    }
  
  var wasmTableMirror = [];
  
  function getWasmTableEntry(funcPtr) {
      var func = wasmTableMirror[funcPtr];
      if (!func) {
        if (funcPtr >= wasmTableMirror.length) wasmTableMirror.length = funcPtr + 1;
        wasmTableMirror[funcPtr] = func = wasmTable.get(funcPtr);
      }
      assert(wasmTable.get(funcPtr) == func, "JavaScript-side Wasm function table mirror is out of date!");
      return func;
    }
  
  /** @param {Object=} args */
  function dynCall(sig, ptr, args) {
      // Without WASM_BIGINT support we cannot directly call function with i64 as
      // part of thier signature, so we rely the dynCall functions generated by
      // wasm-emscripten-finalize
      if (sig.includes('j')) {
        return dynCallLegacy(sig, ptr, args);
      }
      assert(getWasmTableEntry(ptr), 'missing table entry in dynCall: ' + ptr);
      var rtn = getWasmTableEntry(ptr).apply(null, args);
      return rtn;
    }

  
    /**
     * @param {number} ptr
     * @param {string} type
     */
  function getValue(ptr, type = 'i8') {
    if (type.endsWith('*')) type = '*';
    switch (type) {
      case 'i1': return HEAP8[((ptr)>>0)];
      case 'i8': return HEAP8[((ptr)>>0)];
      case 'i16': return HEAP16[((ptr)>>1)];
      case 'i32': return HEAP32[((ptr)>>2)];
      case 'i64': return HEAP32[((ptr)>>2)];
      case 'float': return HEAPF32[((ptr)>>2)];
      case 'double': return HEAPF64[((ptr)>>3)];
      case '*': return HEAPU32[((ptr)>>2)];
      default: abort('invalid type for getValue: ' + type);
    }
  }

  function ptrToString(ptr) {
      assert(typeof ptr === 'number');
      return '0x' + ptr.toString(16).padStart(8, '0');
    }

  
    /**
     * @param {number} ptr
     * @param {number} value
     * @param {string} type
     */
  function setValue(ptr, value, type = 'i8') {
    if (type.endsWith('*')) type = '*';
    switch (type) {
      case 'i1': HEAP8[((ptr)>>0)] = value; break;
      case 'i8': HEAP8[((ptr)>>0)] = value; break;
      case 'i16': HEAP16[((ptr)>>1)] = value; break;
      case 'i32': HEAP32[((ptr)>>2)] = value; break;
      case 'i64': (tempI64 = [value>>>0,(tempDouble=value,(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[((ptr)>>2)] = tempI64[0],HEAP32[(((ptr)+(4))>>2)] = tempI64[1]); break;
      case 'float': HEAPF32[((ptr)>>2)] = value; break;
      case 'double': HEAPF64[((ptr)>>3)] = value; break;
      case '*': HEAPU32[((ptr)>>2)] = value; break;
      default: abort('invalid type for setValue: ' + type);
    }
  }

  function warnOnce(text) {
      if (!warnOnce.shown) warnOnce.shown = {};
      if (!warnOnce.shown[text]) {
        warnOnce.shown[text] = 1;
        if (ENVIRONMENT_IS_NODE) text = 'warning: ' + text;
        err(text);
      }
    }

  function ___assert_fail(condition, filename, line, func) {
      abort('Assertion failed: ' + UTF8ToString(condition) + ', at: ' + [filename ? UTF8ToString(filename) : 'unknown filename', line, func ? UTF8ToString(func) : 'unknown function']);
    }

  function setErrNo(value) {
      HEAP32[((___errno_location())>>2)] = value;
      return value;
    }
  
  var PATH = {isAbs:(path) => path.charAt(0) === '/',splitPath:(filename) => {
        var splitPathRe = /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
        return splitPathRe.exec(filename).slice(1);
      },normalizeArray:(parts, allowAboveRoot) => {
        // if the path tries to go above the root, `up` ends up > 0
        var up = 0;
        for (var i = parts.length - 1; i >= 0; i--) {
          var last = parts[i];
          if (last === '.') {
            parts.splice(i, 1);
          } else if (last === '..') {
            parts.splice(i, 1);
            up++;
          } else if (up) {
            parts.splice(i, 1);
            up--;
          }
        }
        // if the path is allowed to go above the root, restore leading ..s
        if (allowAboveRoot) {
          for (; up; up--) {
            parts.unshift('..');
          }
        }
        return parts;
      },normalize:(path) => {
        var isAbsolute = PATH.isAbs(path),
            trailingSlash = path.substr(-1) === '/';
        // Normalize the path
        path = PATH.normalizeArray(path.split('/').filter((p) => !!p), !isAbsolute).join('/');
        if (!path && !isAbsolute) {
          path = '.';
        }
        if (path && trailingSlash) {
          path += '/';
        }
        return (isAbsolute ? '/' : '') + path;
      },dirname:(path) => {
        var result = PATH.splitPath(path),
            root = result[0],
            dir = result[1];
        if (!root && !dir) {
          // No dirname whatsoever
          return '.';
        }
        if (dir) {
          // It has a dirname, strip trailing slash
          dir = dir.substr(0, dir.length - 1);
        }
        return root + dir;
      },basename:(path) => {
        // EMSCRIPTEN return '/'' for '/', not an empty string
        if (path === '/') return '/';
        path = PATH.normalize(path);
        path = path.replace(/\/$/, "");
        var lastSlash = path.lastIndexOf('/');
        if (lastSlash === -1) return path;
        return path.substr(lastSlash+1);
      },join:function() {
        var paths = Array.prototype.slice.call(arguments);
        return PATH.normalize(paths.join('/'));
      },join2:(l, r) => {
        return PATH.normalize(l + '/' + r);
      }};
  
  function getRandomDevice() {
      if (typeof crypto == 'object' && typeof crypto['getRandomValues'] == 'function') {
        // for modern web browsers
        var randomBuffer = new Uint8Array(1);
        return () => { crypto.getRandomValues(randomBuffer); return randomBuffer[0]; };
      } else
      if (ENVIRONMENT_IS_NODE) {
        // for nodejs with or without crypto support included
        try {
          var crypto_module = require('crypto');
          // nodejs has crypto support
          return () => crypto_module['randomBytes'](1)[0];
        } catch (e) {
          // nodejs doesn't have crypto support
        }
      }
      // we couldn't find a proper implementation, as Math.random() is not suitable for /dev/random, see emscripten-core/emscripten/pull/7096
      return () => abort("no cryptographic support found for randomDevice. consider polyfilling it if you want to use something insecure like Math.random(), e.g. put this in a --pre-js: var crypto = { getRandomValues: function(array) { for (var i = 0; i < array.length; i++) array[i] = (Math.random()*256)|0 } };");
    }
  
  
  
  var PATH_FS = {resolve:function() {
        var resolvedPath = '',
          resolvedAbsolute = false;
        for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
          var path = (i >= 0) ? arguments[i] : FS.cwd();
          // Skip empty and invalid entries
          if (typeof path != 'string') {
            throw new TypeError('Arguments to path.resolve must be strings');
          } else if (!path) {
            return ''; // an invalid portion invalidates the whole thing
          }
          resolvedPath = path + '/' + resolvedPath;
          resolvedAbsolute = PATH.isAbs(path);
        }
        // At this point the path should be resolved to a full absolute path, but
        // handle relative paths to be safe (might happen when process.cwd() fails)
        resolvedPath = PATH.normalizeArray(resolvedPath.split('/').filter((p) => !!p), !resolvedAbsolute).join('/');
        return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
      },relative:(from, to) => {
        from = PATH_FS.resolve(from).substr(1);
        to = PATH_FS.resolve(to).substr(1);
        function trim(arr) {
          var start = 0;
          for (; start < arr.length; start++) {
            if (arr[start] !== '') break;
          }
          var end = arr.length - 1;
          for (; end >= 0; end--) {
            if (arr[end] !== '') break;
          }
          if (start > end) return [];
          return arr.slice(start, end - start + 1);
        }
        var fromParts = trim(from.split('/'));
        var toParts = trim(to.split('/'));
        var length = Math.min(fromParts.length, toParts.length);
        var samePartsLength = length;
        for (var i = 0; i < length; i++) {
          if (fromParts[i] !== toParts[i]) {
            samePartsLength = i;
            break;
          }
        }
        var outputParts = [];
        for (var i = samePartsLength; i < fromParts.length; i++) {
          outputParts.push('..');
        }
        outputParts = outputParts.concat(toParts.slice(samePartsLength));
        return outputParts.join('/');
      }};
  
  
  /** @type {function(string, boolean=, number=)} */
  function intArrayFromString(stringy, dontAddNull, length) {
    var len = length > 0 ? length : lengthBytesUTF8(stringy)+1;
    var u8array = new Array(len);
    var numBytesWritten = stringToUTF8Array(stringy, u8array, 0, u8array.length);
    if (dontAddNull) u8array.length = numBytesWritten;
    return u8array;
  }
  var TTY = {ttys:[],init:function () {
        // https://github.com/emscripten-core/emscripten/pull/1555
        // if (ENVIRONMENT_IS_NODE) {
        //   // currently, FS.init does not distinguish if process.stdin is a file or TTY
        //   // device, it always assumes it's a TTY device. because of this, we're forcing
        //   // process.stdin to UTF8 encoding to at least make stdin reading compatible
        //   // with text files until FS.init can be refactored.
        //   process.stdin.setEncoding('utf8');
        // }
      },shutdown:function() {
        // https://github.com/emscripten-core/emscripten/pull/1555
        // if (ENVIRONMENT_IS_NODE) {
        //   // inolen: any idea as to why node -e 'process.stdin.read()' wouldn't exit immediately (with process.stdin being a tty)?
        //   // isaacs: because now it's reading from the stream, you've expressed interest in it, so that read() kicks off a _read() which creates a ReadReq operation
        //   // inolen: I thought read() in that case was a synchronous operation that just grabbed some amount of buffered data if it exists?
        //   // isaacs: it is. but it also triggers a _read() call, which calls readStart() on the handle
        //   // isaacs: do process.stdin.pause() and i'd think it'd probably close the pending call
        //   process.stdin.pause();
        // }
      },register:function(dev, ops) {
        TTY.ttys[dev] = { input: [], output: [], ops: ops };
        FS.registerDevice(dev, TTY.stream_ops);
      },stream_ops:{open:function(stream) {
          var tty = TTY.ttys[stream.node.rdev];
          if (!tty) {
            throw new FS.ErrnoError(43);
          }
          stream.tty = tty;
          stream.seekable = false;
        },close:function(stream) {
          // flush any pending line data
          stream.tty.ops.fsync(stream.tty);
        },fsync:function(stream) {
          stream.tty.ops.fsync(stream.tty);
        },read:function(stream, buffer, offset, length, pos /* ignored */) {
          if (!stream.tty || !stream.tty.ops.get_char) {
            throw new FS.ErrnoError(60);
          }
          var bytesRead = 0;
          for (var i = 0; i < length; i++) {
            var result;
            try {
              result = stream.tty.ops.get_char(stream.tty);
            } catch (e) {
              throw new FS.ErrnoError(29);
            }
            if (result === undefined && bytesRead === 0) {
              throw new FS.ErrnoError(6);
            }
            if (result === null || result === undefined) break;
            bytesRead++;
            buffer[offset+i] = result;
          }
          if (bytesRead) {
            stream.node.timestamp = Date.now();
          }
          return bytesRead;
        },write:function(stream, buffer, offset, length, pos) {
          if (!stream.tty || !stream.tty.ops.put_char) {
            throw new FS.ErrnoError(60);
          }
          try {
            for (var i = 0; i < length; i++) {
              stream.tty.ops.put_char(stream.tty, buffer[offset+i]);
            }
          } catch (e) {
            throw new FS.ErrnoError(29);
          }
          if (length) {
            stream.node.timestamp = Date.now();
          }
          return i;
        }},default_tty_ops:{get_char:function(tty) {
          if (!tty.input.length) {
            var result = null;
            if (ENVIRONMENT_IS_NODE) {
              // we will read data by chunks of BUFSIZE
              var BUFSIZE = 256;
              var buf = Buffer.alloc(BUFSIZE);
              var bytesRead = 0;
  
              try {
                bytesRead = fs.readSync(process.stdin.fd, buf, 0, BUFSIZE, -1);
              } catch(e) {
                // Cross-platform differences: on Windows, reading EOF throws an exception, but on other OSes,
                // reading EOF returns 0. Uniformize behavior by treating the EOF exception to return 0.
                if (e.toString().includes('EOF')) bytesRead = 0;
                else throw e;
              }
  
              if (bytesRead > 0) {
                result = buf.slice(0, bytesRead).toString('utf-8');
              } else {
                result = null;
              }
            } else
            if (typeof window != 'undefined' &&
              typeof window.prompt == 'function') {
              // Browser.
              result = window.prompt('Input: ');  // returns null on cancel
              if (result !== null) {
                result += '\n';
              }
            } else if (typeof readline == 'function') {
              // Command line.
              result = readline();
              if (result !== null) {
                result += '\n';
              }
            }
            if (!result) {
              return null;
            }
            tty.input = intArrayFromString(result, true);
          }
          return tty.input.shift();
        },put_char:function(tty, val) {
          if (val === null || val === 10) {
            out(UTF8ArrayToString(tty.output, 0));
            tty.output = [];
          } else {
            if (val != 0) tty.output.push(val); // val == 0 would cut text output off in the middle.
          }
        },fsync:function(tty) {
          if (tty.output && tty.output.length > 0) {
            out(UTF8ArrayToString(tty.output, 0));
            tty.output = [];
          }
        }},default_tty1_ops:{put_char:function(tty, val) {
          if (val === null || val === 10) {
            err(UTF8ArrayToString(tty.output, 0));
            tty.output = [];
          } else {
            if (val != 0) tty.output.push(val);
          }
        },fsync:function(tty) {
          if (tty.output && tty.output.length > 0) {
            err(UTF8ArrayToString(tty.output, 0));
            tty.output = [];
          }
        }}};
  
  
  function zeroMemory(address, size) {
      HEAPU8.fill(0, address, address + size);
      return address;
    }
  
  function alignMemory(size, alignment) {
      assert(alignment, "alignment argument is required");
      return Math.ceil(size / alignment) * alignment;
    }
  function mmapAlloc(size) {
      abort('internal error: mmapAlloc called but `emscripten_builtin_memalign` native symbol not exported');
    }
  var MEMFS = {ops_table:null,mount:function(mount) {
        return MEMFS.createNode(null, '/', 16384 | 511 /* 0777 */, 0);
      },createNode:function(parent, name, mode, dev) {
        if (FS.isBlkdev(mode) || FS.isFIFO(mode)) {
          // no supported
          throw new FS.ErrnoError(63);
        }
        if (!MEMFS.ops_table) {
          MEMFS.ops_table = {
            dir: {
              node: {
                getattr: MEMFS.node_ops.getattr,
                setattr: MEMFS.node_ops.setattr,
                lookup: MEMFS.node_ops.lookup,
                mknod: MEMFS.node_ops.mknod,
                rename: MEMFS.node_ops.rename,
                unlink: MEMFS.node_ops.unlink,
                rmdir: MEMFS.node_ops.rmdir,
                readdir: MEMFS.node_ops.readdir,
                symlink: MEMFS.node_ops.symlink
              },
              stream: {
                llseek: MEMFS.stream_ops.llseek
              }
            },
            file: {
              node: {
                getattr: MEMFS.node_ops.getattr,
                setattr: MEMFS.node_ops.setattr
              },
              stream: {
                llseek: MEMFS.stream_ops.llseek,
                read: MEMFS.stream_ops.read,
                write: MEMFS.stream_ops.write,
                allocate: MEMFS.stream_ops.allocate,
                mmap: MEMFS.stream_ops.mmap,
                msync: MEMFS.stream_ops.msync
              }
            },
            link: {
              node: {
                getattr: MEMFS.node_ops.getattr,
                setattr: MEMFS.node_ops.setattr,
                readlink: MEMFS.node_ops.readlink
              },
              stream: {}
            },
            chrdev: {
              node: {
                getattr: MEMFS.node_ops.getattr,
                setattr: MEMFS.node_ops.setattr
              },
              stream: FS.chrdev_stream_ops
            }
          };
        }
        var node = FS.createNode(parent, name, mode, dev);
        if (FS.isDir(node.mode)) {
          node.node_ops = MEMFS.ops_table.dir.node;
          node.stream_ops = MEMFS.ops_table.dir.stream;
          node.contents = {};
        } else if (FS.isFile(node.mode)) {
          node.node_ops = MEMFS.ops_table.file.node;
          node.stream_ops = MEMFS.ops_table.file.stream;
          node.usedBytes = 0; // The actual number of bytes used in the typed array, as opposed to contents.length which gives the whole capacity.
          // When the byte data of the file is populated, this will point to either a typed array, or a normal JS array. Typed arrays are preferred
          // for performance, and used by default. However, typed arrays are not resizable like normal JS arrays are, so there is a small disk size
          // penalty involved for appending file writes that continuously grow a file similar to std::vector capacity vs used -scheme.
          node.contents = null; 
        } else if (FS.isLink(node.mode)) {
          node.node_ops = MEMFS.ops_table.link.node;
          node.stream_ops = MEMFS.ops_table.link.stream;
        } else if (FS.isChrdev(node.mode)) {
          node.node_ops = MEMFS.ops_table.chrdev.node;
          node.stream_ops = MEMFS.ops_table.chrdev.stream;
        }
        node.timestamp = Date.now();
        // add the new node to the parent
        if (parent) {
          parent.contents[name] = node;
          parent.timestamp = node.timestamp;
        }
        return node;
      },getFileDataAsTypedArray:function(node) {
        if (!node.contents) return new Uint8Array(0);
        if (node.contents.subarray) return node.contents.subarray(0, node.usedBytes); // Make sure to not return excess unused bytes.
        return new Uint8Array(node.contents);
      },expandFileStorage:function(node, newCapacity) {
        var prevCapacity = node.contents ? node.contents.length : 0;
        if (prevCapacity >= newCapacity) return; // No need to expand, the storage was already large enough.
        // Don't expand strictly to the given requested limit if it's only a very small increase, but instead geometrically grow capacity.
        // For small filesizes (<1MB), perform size*2 geometric increase, but for large sizes, do a much more conservative size*1.125 increase to
        // avoid overshooting the allocation cap by a very large margin.
        var CAPACITY_DOUBLING_MAX = 1024 * 1024;
        newCapacity = Math.max(newCapacity, (prevCapacity * (prevCapacity < CAPACITY_DOUBLING_MAX ? 2.0 : 1.125)) >>> 0);
        if (prevCapacity != 0) newCapacity = Math.max(newCapacity, 256); // At minimum allocate 256b for each file when expanding.
        var oldContents = node.contents;
        node.contents = new Uint8Array(newCapacity); // Allocate new storage.
        if (node.usedBytes > 0) node.contents.set(oldContents.subarray(0, node.usedBytes), 0); // Copy old data over to the new storage.
      },resizeFileStorage:function(node, newSize) {
        if (node.usedBytes == newSize) return;
        if (newSize == 0) {
          node.contents = null; // Fully decommit when requesting a resize to zero.
          node.usedBytes = 0;
        } else {
          var oldContents = node.contents;
          node.contents = new Uint8Array(newSize); // Allocate new storage.
          if (oldContents) {
            node.contents.set(oldContents.subarray(0, Math.min(newSize, node.usedBytes))); // Copy old data over to the new storage.
          }
          node.usedBytes = newSize;
        }
      },node_ops:{getattr:function(node) {
          var attr = {};
          // device numbers reuse inode numbers.
          attr.dev = FS.isChrdev(node.mode) ? node.id : 1;
          attr.ino = node.id;
          attr.mode = node.mode;
          attr.nlink = 1;
          attr.uid = 0;
          attr.gid = 0;
          attr.rdev = node.rdev;
          if (FS.isDir(node.mode)) {
            attr.size = 4096;
          } else if (FS.isFile(node.mode)) {
            attr.size = node.usedBytes;
          } else if (FS.isLink(node.mode)) {
            attr.size = node.link.length;
          } else {
            attr.size = 0;
          }
          attr.atime = new Date(node.timestamp);
          attr.mtime = new Date(node.timestamp);
          attr.ctime = new Date(node.timestamp);
          // NOTE: In our implementation, st_blocks = Math.ceil(st_size/st_blksize),
          //       but this is not required by the standard.
          attr.blksize = 4096;
          attr.blocks = Math.ceil(attr.size / attr.blksize);
          return attr;
        },setattr:function(node, attr) {
          if (attr.mode !== undefined) {
            node.mode = attr.mode;
          }
          if (attr.timestamp !== undefined) {
            node.timestamp = attr.timestamp;
          }
          if (attr.size !== undefined) {
            MEMFS.resizeFileStorage(node, attr.size);
          }
        },lookup:function(parent, name) {
          throw FS.genericErrors[44];
        },mknod:function(parent, name, mode, dev) {
          return MEMFS.createNode(parent, name, mode, dev);
        },rename:function(old_node, new_dir, new_name) {
          // if we're overwriting a directory at new_name, make sure it's empty.
          if (FS.isDir(old_node.mode)) {
            var new_node;
            try {
              new_node = FS.lookupNode(new_dir, new_name);
            } catch (e) {
            }
            if (new_node) {
              for (var i in new_node.contents) {
                throw new FS.ErrnoError(55);
              }
            }
          }
          // do the internal rewiring
          delete old_node.parent.contents[old_node.name];
          old_node.parent.timestamp = Date.now()
          old_node.name = new_name;
          new_dir.contents[new_name] = old_node;
          new_dir.timestamp = old_node.parent.timestamp;
          old_node.parent = new_dir;
        },unlink:function(parent, name) {
          delete parent.contents[name];
          parent.timestamp = Date.now();
        },rmdir:function(parent, name) {
          var node = FS.lookupNode(parent, name);
          for (var i in node.contents) {
            throw new FS.ErrnoError(55);
          }
          delete parent.contents[name];
          parent.timestamp = Date.now();
        },readdir:function(node) {
          var entries = ['.', '..'];
          for (var key in node.contents) {
            if (!node.contents.hasOwnProperty(key)) {
              continue;
            }
            entries.push(key);
          }
          return entries;
        },symlink:function(parent, newname, oldpath) {
          var node = MEMFS.createNode(parent, newname, 511 /* 0777 */ | 40960, 0);
          node.link = oldpath;
          return node;
        },readlink:function(node) {
          if (!FS.isLink(node.mode)) {
            throw new FS.ErrnoError(28);
          }
          return node.link;
        }},stream_ops:{read:function(stream, buffer, offset, length, position) {
          var contents = stream.node.contents;
          if (position >= stream.node.usedBytes) return 0;
          var size = Math.min(stream.node.usedBytes - position, length);
          assert(size >= 0);
          if (size > 8 && contents.subarray) { // non-trivial, and typed array
            buffer.set(contents.subarray(position, position + size), offset);
          } else {
            for (var i = 0; i < size; i++) buffer[offset + i] = contents[position + i];
          }
          return size;
        },write:function(stream, buffer, offset, length, position, canOwn) {
          // The data buffer should be a typed array view
          assert(!(buffer instanceof ArrayBuffer));
          // If the buffer is located in main memory (HEAP), and if
          // memory can grow, we can't hold on to references of the
          // memory buffer, as they may get invalidated. That means we
          // need to do copy its contents.
          if (buffer.buffer === HEAP8.buffer) {
            canOwn = false;
          }
  
          if (!length) return 0;
          var node = stream.node;
          node.timestamp = Date.now();
  
          if (buffer.subarray && (!node.contents || node.contents.subarray)) { // This write is from a typed array to a typed array?
            if (canOwn) {
              assert(position === 0, 'canOwn must imply no weird position inside the file');
              node.contents = buffer.subarray(offset, offset + length);
              node.usedBytes = length;
              return length;
            } else if (node.usedBytes === 0 && position === 0) { // If this is a simple first write to an empty file, do a fast set since we don't need to care about old data.
              node.contents = buffer.slice(offset, offset + length);
              node.usedBytes = length;
              return length;
            } else if (position + length <= node.usedBytes) { // Writing to an already allocated and used subrange of the file?
              node.contents.set(buffer.subarray(offset, offset + length), position);
              return length;
            }
          }
  
          // Appending to an existing file and we need to reallocate, or source data did not come as a typed array.
          MEMFS.expandFileStorage(node, position+length);
          if (node.contents.subarray && buffer.subarray) {
            // Use typed array write which is available.
            node.contents.set(buffer.subarray(offset, offset + length), position);
          } else {
            for (var i = 0; i < length; i++) {
             node.contents[position + i] = buffer[offset + i]; // Or fall back to manual write if not.
            }
          }
          node.usedBytes = Math.max(node.usedBytes, position + length);
          return length;
        },llseek:function(stream, offset, whence) {
          var position = offset;
          if (whence === 1) {
            position += stream.position;
          } else if (whence === 2) {
            if (FS.isFile(stream.node.mode)) {
              position += stream.node.usedBytes;
            }
          }
          if (position < 0) {
            throw new FS.ErrnoError(28);
          }
          return position;
        },allocate:function(stream, offset, length) {
          MEMFS.expandFileStorage(stream.node, offset + length);
          stream.node.usedBytes = Math.max(stream.node.usedBytes, offset + length);
        },mmap:function(stream, length, position, prot, flags) {
          if (!FS.isFile(stream.node.mode)) {
            throw new FS.ErrnoError(43);
          }
          var ptr;
          var allocated;
          var contents = stream.node.contents;
          // Only make a new copy when MAP_PRIVATE is specified.
          if (!(flags & 2) && contents.buffer === HEAP8.buffer) {
            // We can't emulate MAP_SHARED when the file is not backed by the
            // buffer we're mapping to (e.g. the HEAP buffer).
            allocated = false;
            ptr = contents.byteOffset;
          } else {
            // Try to avoid unnecessary slices.
            if (position > 0 || position + length < contents.length) {
              if (contents.subarray) {
                contents = contents.subarray(position, position + length);
              } else {
                contents = Array.prototype.slice.call(contents, position, position + length);
              }
            }
            allocated = true;
            ptr = mmapAlloc(length);
            if (!ptr) {
              throw new FS.ErrnoError(48);
            }
            HEAP8.set(contents, ptr);
          }
          return { ptr: ptr, allocated: allocated };
        },msync:function(stream, buffer, offset, length, mmapFlags) {
          MEMFS.stream_ops.write(stream, buffer, 0, length, offset, false);
          // should we check if bytesWritten and length are the same?
          return 0;
        }}};
  
  /** @param {boolean=} noRunDep */
  function asyncLoad(url, onload, onerror, noRunDep) {
      var dep = !noRunDep ? getUniqueRunDependency('al ' + url) : '';
      readAsync(url, (arrayBuffer) => {
        assert(arrayBuffer, 'Loading data file "' + url + '" failed (no arrayBuffer).');
        onload(new Uint8Array(arrayBuffer));
        if (dep) removeRunDependency(dep);
      }, (event) => {
        if (onerror) {
          onerror();
        } else {
          throw 'Loading data file "' + url + '" failed.';
        }
      });
      if (dep) addRunDependency(dep);
    }
  
  
  var ERRNO_MESSAGES = {0:"Success",1:"Arg list too long",2:"Permission denied",3:"Address already in use",4:"Address not available",5:"Address family not supported by protocol family",6:"No more processes",7:"Socket already connected",8:"Bad file number",9:"Trying to read unreadable message",10:"Mount device busy",11:"Operation canceled",12:"No children",13:"Connection aborted",14:"Connection refused",15:"Connection reset by peer",16:"File locking deadlock error",17:"Destination address required",18:"Math arg out of domain of func",19:"Quota exceeded",20:"File exists",21:"Bad address",22:"File too large",23:"Host is unreachable",24:"Identifier removed",25:"Illegal byte sequence",26:"Connection already in progress",27:"Interrupted system call",28:"Invalid argument",29:"I/O error",30:"Socket is already connected",31:"Is a directory",32:"Too many symbolic links",33:"Too many open files",34:"Too many links",35:"Message too long",36:"Multihop attempted",37:"File or path name too long",38:"Network interface is not configured",39:"Connection reset by network",40:"Network is unreachable",41:"Too many open files in system",42:"No buffer space available",43:"No such device",44:"No such file or directory",45:"Exec format error",46:"No record locks available",47:"The link has been severed",48:"Not enough core",49:"No message of desired type",50:"Protocol not available",51:"No space left on device",52:"Function not implemented",53:"Socket is not connected",54:"Not a directory",55:"Directory not empty",56:"State not recoverable",57:"Socket operation on non-socket",59:"Not a typewriter",60:"No such device or address",61:"Value too large for defined data type",62:"Previous owner died",63:"Not super-user",64:"Broken pipe",65:"Protocol error",66:"Unknown protocol",67:"Protocol wrong type for socket",68:"Math result not representable",69:"Read only file system",70:"Illegal seek",71:"No such process",72:"Stale file handle",73:"Connection timed out",74:"Text file busy",75:"Cross-device link",100:"Device not a stream",101:"Bad font file fmt",102:"Invalid slot",103:"Invalid request code",104:"No anode",105:"Block device required",106:"Channel number out of range",107:"Level 3 halted",108:"Level 3 reset",109:"Link number out of range",110:"Protocol driver not attached",111:"No CSI structure available",112:"Level 2 halted",113:"Invalid exchange",114:"Invalid request descriptor",115:"Exchange full",116:"No data (for no delay io)",117:"Timer expired",118:"Out of streams resources",119:"Machine is not on the network",120:"Package not installed",121:"The object is remote",122:"Advertise error",123:"Srmount error",124:"Communication error on send",125:"Cross mount point (not really error)",126:"Given log. name not unique",127:"f.d. invalid for this operation",128:"Remote address changed",129:"Can   access a needed shared lib",130:"Accessing a corrupted shared lib",131:".lib section in a.out corrupted",132:"Attempting to link in too many libs",133:"Attempting to exec a shared library",135:"Streams pipe error",136:"Too many users",137:"Socket type not supported",138:"Not supported",139:"Protocol family not supported",140:"Can't send after socket shutdown",141:"Too many references",142:"Host is down",148:"No medium (in tape drive)",156:"Level 2 not synchronized"};
  
  var ERRNO_CODES = {};
  
  function demangle(func) {
      warnOnce('warning: build with -sDEMANGLE_SUPPORT to link in libcxxabi demangling');
      return func;
    }
  function demangleAll(text) {
      var regex =
        /\b_Z[\w\d_]+/g;
      return text.replace(regex,
        function(x) {
          var y = demangle(x);
          return x === y ? x : (y + ' [' + x + ']');
        });
    }
  var FS = {root:null,mounts:[],devices:{},streams:[],nextInode:1,nameTable:null,currentPath:"/",initialized:false,ignorePermissions:true,ErrnoError:null,genericErrors:{},filesystems:null,syncFSRequests:0,lookupPath:(path, opts = {}) => {
        path = PATH_FS.resolve(path);
  
        if (!path) return { path: '', node: null };
  
        var defaults = {
          follow_mount: true,
          recurse_count: 0
        };
        opts = Object.assign(defaults, opts)
  
        if (opts.recurse_count > 8) {  // max recursive lookup of 8
          throw new FS.ErrnoError(32);
        }
  
        // split the absolute path
        var parts = path.split('/').filter((p) => !!p);
  
        // start at the root
        var current = FS.root;
        var current_path = '/';
  
        for (var i = 0; i < parts.length; i++) {
          var islast = (i === parts.length-1);
          if (islast && opts.parent) {
            // stop resolving
            break;
          }
  
          current = FS.lookupNode(current, parts[i]);
          current_path = PATH.join2(current_path, parts[i]);
  
          // jump to the mount's root node if this is a mountpoint
          if (FS.isMountpoint(current)) {
            if (!islast || (islast && opts.follow_mount)) {
              current = current.mounted.root;
            }
          }
  
          // by default, lookupPath will not follow a symlink if it is the final path component.
          // setting opts.follow = true will override this behavior.
          if (!islast || opts.follow) {
            var count = 0;
            while (FS.isLink(current.mode)) {
              var link = FS.readlink(current_path);
              current_path = PATH_FS.resolve(PATH.dirname(current_path), link);
  
              var lookup = FS.lookupPath(current_path, { recurse_count: opts.recurse_count + 1 });
              current = lookup.node;
  
              if (count++ > 40) {  // limit max consecutive symlinks to 40 (SYMLOOP_MAX).
                throw new FS.ErrnoError(32);
              }
            }
          }
        }
  
        return { path: current_path, node: current };
      },getPath:(node) => {
        var path;
        while (true) {
          if (FS.isRoot(node)) {
            var mount = node.mount.mountpoint;
            if (!path) return mount;
            return mount[mount.length-1] !== '/' ? mount + '/' + path : mount + path;
          }
          path = path ? node.name + '/' + path : node.name;
          node = node.parent;
        }
      },hashName:(parentid, name) => {
        var hash = 0;
  
        for (var i = 0; i < name.length; i++) {
          hash = ((hash << 5) - hash + name.charCodeAt(i)) | 0;
        }
        return ((parentid + hash) >>> 0) % FS.nameTable.length;
      },hashAddNode:(node) => {
        var hash = FS.hashName(node.parent.id, node.name);
        node.name_next = FS.nameTable[hash];
        FS.nameTable[hash] = node;
      },hashRemoveNode:(node) => {
        var hash = FS.hashName(node.parent.id, node.name);
        if (FS.nameTable[hash] === node) {
          FS.nameTable[hash] = node.name_next;
        } else {
          var current = FS.nameTable[hash];
          while (current) {
            if (current.name_next === node) {
              current.name_next = node.name_next;
              break;
            }
            current = current.name_next;
          }
        }
      },lookupNode:(parent, name) => {
        var errCode = FS.mayLookup(parent);
        if (errCode) {
          throw new FS.ErrnoError(errCode, parent);
        }
        var hash = FS.hashName(parent.id, name);
        for (var node = FS.nameTable[hash]; node; node = node.name_next) {
          var nodeName = node.name;
          if (node.parent.id === parent.id && nodeName === name) {
            return node;
          }
        }
        // if we failed to find it in the cache, call into the VFS
        return FS.lookup(parent, name);
      },createNode:(parent, name, mode, rdev) => {
        assert(typeof parent == 'object')
        var node = new FS.FSNode(parent, name, mode, rdev);
  
        FS.hashAddNode(node);
  
        return node;
      },destroyNode:(node) => {
        FS.hashRemoveNode(node);
      },isRoot:(node) => {
        return node === node.parent;
      },isMountpoint:(node) => {
        return !!node.mounted;
      },isFile:(mode) => {
        return (mode & 61440) === 32768;
      },isDir:(mode) => {
        return (mode & 61440) === 16384;
      },isLink:(mode) => {
        return (mode & 61440) === 40960;
      },isChrdev:(mode) => {
        return (mode & 61440) === 8192;
      },isBlkdev:(mode) => {
        return (mode & 61440) === 24576;
      },isFIFO:(mode) => {
        return (mode & 61440) === 4096;
      },isSocket:(mode) => {
        return (mode & 49152) === 49152;
      },flagModes:{"r":0,"r+":2,"w":577,"w+":578,"a":1089,"a+":1090},modeStringToFlags:(str) => {
        var flags = FS.flagModes[str];
        if (typeof flags == 'undefined') {
          throw new Error('Unknown file open mode: ' + str);
        }
        return flags;
      },flagsToPermissionString:(flag) => {
        var perms = ['r', 'w', 'rw'][flag & 3];
        if ((flag & 512)) {
          perms += 'w';
        }
        return perms;
      },nodePermissions:(node, perms) => {
        if (FS.ignorePermissions) {
          return 0;
        }
        // return 0 if any user, group or owner bits are set.
        if (perms.includes('r') && !(node.mode & 292)) {
          return 2;
        } else if (perms.includes('w') && !(node.mode & 146)) {
          return 2;
        } else if (perms.includes('x') && !(node.mode & 73)) {
          return 2;
        }
        return 0;
      },mayLookup:(dir) => {
        var errCode = FS.nodePermissions(dir, 'x');
        if (errCode) return errCode;
        if (!dir.node_ops.lookup) return 2;
        return 0;
      },mayCreate:(dir, name) => {
        try {
          var node = FS.lookupNode(dir, name);
          return 20;
        } catch (e) {
        }
        return FS.nodePermissions(dir, 'wx');
      },mayDelete:(dir, name, isdir) => {
        var node;
        try {
          node = FS.lookupNode(dir, name);
        } catch (e) {
          return e.errno;
        }
        var errCode = FS.nodePermissions(dir, 'wx');
        if (errCode) {
          return errCode;
        }
        if (isdir) {
          if (!FS.isDir(node.mode)) {
            return 54;
          }
          if (FS.isRoot(node) || FS.getPath(node) === FS.cwd()) {
            return 10;
          }
        } else {
          if (FS.isDir(node.mode)) {
            return 31;
          }
        }
        return 0;
      },mayOpen:(node, flags) => {
        if (!node) {
          return 44;
        }
        if (FS.isLink(node.mode)) {
          return 32;
        } else if (FS.isDir(node.mode)) {
          if (FS.flagsToPermissionString(flags) !== 'r' || // opening for write
              (flags & 512)) { // TODO: check for O_SEARCH? (== search for dir only)
            return 31;
          }
        }
        return FS.nodePermissions(node, FS.flagsToPermissionString(flags));
      },MAX_OPEN_FDS:4096,nextfd:(fd_start = 0, fd_end = FS.MAX_OPEN_FDS) => {
        for (var fd = fd_start; fd <= fd_end; fd++) {
          if (!FS.streams[fd]) {
            return fd;
          }
        }
        throw new FS.ErrnoError(33);
      },getStream:(fd) => FS.streams[fd],createStream:(stream, fd_start, fd_end) => {
        if (!FS.FSStream) {
          FS.FSStream = /** @constructor */ function() {
            this.shared = { };
          };
          FS.FSStream.prototype = {};
          Object.defineProperties(FS.FSStream.prototype, {
            object: {
              /** @this {FS.FSStream} */
              get: function() { return this.node; },
              /** @this {FS.FSStream} */
              set: function(val) { this.node = val; }
            },
            isRead: {
              /** @this {FS.FSStream} */
              get: function() { return (this.flags & 2097155) !== 1; }
            },
            isWrite: {
              /** @this {FS.FSStream} */
              get: function() { return (this.flags & 2097155) !== 0; }
            },
            isAppend: {
              /** @this {FS.FSStream} */
              get: function() { return (this.flags & 1024); }
            },
            flags: {
              /** @this {FS.FSStream} */
              get: function() { return this.shared.flags; },
              /** @this {FS.FSStream} */
              set: function(val) { this.shared.flags = val; },
            },
            position : {
              /** @this {FS.FSStream} */
              get: function() { return this.shared.position; },
              /** @this {FS.FSStream} */
              set: function(val) { this.shared.position = val; },
            },
          });
        }
        // clone it, so we can return an instance of FSStream
        stream = Object.assign(new FS.FSStream(), stream);
        var fd = FS.nextfd(fd_start, fd_end);
        stream.fd = fd;
        FS.streams[fd] = stream;
        return stream;
      },closeStream:(fd) => {
        FS.streams[fd] = null;
      },chrdev_stream_ops:{open:(stream) => {
          var device = FS.getDevice(stream.node.rdev);
          // override node's stream ops with the device's
          stream.stream_ops = device.stream_ops;
          // forward the open call
          if (stream.stream_ops.open) {
            stream.stream_ops.open(stream);
          }
        },llseek:() => {
          throw new FS.ErrnoError(70);
        }},major:(dev) => ((dev) >> 8),minor:(dev) => ((dev) & 0xff),makedev:(ma, mi) => ((ma) << 8 | (mi)),registerDevice:(dev, ops) => {
        FS.devices[dev] = { stream_ops: ops };
      },getDevice:(dev) => FS.devices[dev],getMounts:(mount) => {
        var mounts = [];
        var check = [mount];
  
        while (check.length) {
          var m = check.pop();
  
          mounts.push(m);
  
          check.push.apply(check, m.mounts);
        }
  
        return mounts;
      },syncfs:(populate, callback) => {
        if (typeof populate == 'function') {
          callback = populate;
          populate = false;
        }
  
        FS.syncFSRequests++;
  
        if (FS.syncFSRequests > 1) {
          err('warning: ' + FS.syncFSRequests + ' FS.syncfs operations in flight at once, probably just doing extra work');
        }
  
        var mounts = FS.getMounts(FS.root.mount);
        var completed = 0;
  
        function doCallback(errCode) {
          assert(FS.syncFSRequests > 0);
          FS.syncFSRequests--;
          return callback(errCode);
        }
  
        function done(errCode) {
          if (errCode) {
            if (!done.errored) {
              done.errored = true;
              return doCallback(errCode);
            }
            return;
          }
          if (++completed >= mounts.length) {
            doCallback(null);
          }
        };
  
        // sync all mounts
        mounts.forEach((mount) => {
          if (!mount.type.syncfs) {
            return done(null);
          }
          mount.type.syncfs(mount, populate, done);
        });
      },mount:(type, opts, mountpoint) => {
        if (typeof type == 'string') {
          // The filesystem was not included, and instead we have an error
          // message stored in the variable.
          throw type;
        }
        var root = mountpoint === '/';
        var pseudo = !mountpoint;
        var node;
  
        if (root && FS.root) {
          throw new FS.ErrnoError(10);
        } else if (!root && !pseudo) {
          var lookup = FS.lookupPath(mountpoint, { follow_mount: false });
  
          mountpoint = lookup.path;  // use the absolute path
          node = lookup.node;
  
          if (FS.isMountpoint(node)) {
            throw new FS.ErrnoError(10);
          }
  
          if (!FS.isDir(node.mode)) {
            throw new FS.ErrnoError(54);
          }
        }
  
        var mount = {
          type: type,
          opts: opts,
          mountpoint: mountpoint,
          mounts: []
        };
  
        // create a root node for the fs
        var mountRoot = type.mount(mount);
        mountRoot.mount = mount;
        mount.root = mountRoot;
  
        if (root) {
          FS.root = mountRoot;
        } else if (node) {
          // set as a mountpoint
          node.mounted = mount;
  
          // add the new mount to the current mount's children
          if (node.mount) {
            node.mount.mounts.push(mount);
          }
        }
  
        return mountRoot;
      },unmount:(mountpoint) => {
        var lookup = FS.lookupPath(mountpoint, { follow_mount: false });
  
        if (!FS.isMountpoint(lookup.node)) {
          throw new FS.ErrnoError(28);
        }
  
        // destroy the nodes for this mount, and all its child mounts
        var node = lookup.node;
        var mount = node.mounted;
        var mounts = FS.getMounts(mount);
  
        Object.keys(FS.nameTable).forEach((hash) => {
          var current = FS.nameTable[hash];
  
          while (current) {
            var next = current.name_next;
  
            if (mounts.includes(current.mount)) {
              FS.destroyNode(current);
            }
  
            current = next;
          }
        });
  
        // no longer a mountpoint
        node.mounted = null;
  
        // remove this mount from the child mounts
        var idx = node.mount.mounts.indexOf(mount);
        assert(idx !== -1);
        node.mount.mounts.splice(idx, 1);
      },lookup:(parent, name) => {
        return parent.node_ops.lookup(parent, name);
      },mknod:(path, mode, dev) => {
        var lookup = FS.lookupPath(path, { parent: true });
        var parent = lookup.node;
        var name = PATH.basename(path);
        if (!name || name === '.' || name === '..') {
          throw new FS.ErrnoError(28);
        }
        var errCode = FS.mayCreate(parent, name);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        if (!parent.node_ops.mknod) {
          throw new FS.ErrnoError(63);
        }
        return parent.node_ops.mknod(parent, name, mode, dev);
      },create:(path, mode) => {
        mode = mode !== undefined ? mode : 438 /* 0666 */;
        mode &= 4095;
        mode |= 32768;
        return FS.mknod(path, mode, 0);
      },mkdir:(path, mode) => {
        mode = mode !== undefined ? mode : 511 /* 0777 */;
        mode &= 511 | 512;
        mode |= 16384;
        return FS.mknod(path, mode, 0);
      },mkdirTree:(path, mode) => {
        var dirs = path.split('/');
        var d = '';
        for (var i = 0; i < dirs.length; ++i) {
          if (!dirs[i]) continue;
          d += '/' + dirs[i];
          try {
            FS.mkdir(d, mode);
          } catch(e) {
            if (e.errno != 20) throw e;
          }
        }
      },mkdev:(path, mode, dev) => {
        if (typeof dev == 'undefined') {
          dev = mode;
          mode = 438 /* 0666 */;
        }
        mode |= 8192;
        return FS.mknod(path, mode, dev);
      },symlink:(oldpath, newpath) => {
        if (!PATH_FS.resolve(oldpath)) {
          throw new FS.ErrnoError(44);
        }
        var lookup = FS.lookupPath(newpath, { parent: true });
        var parent = lookup.node;
        if (!parent) {
          throw new FS.ErrnoError(44);
        }
        var newname = PATH.basename(newpath);
        var errCode = FS.mayCreate(parent, newname);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        if (!parent.node_ops.symlink) {
          throw new FS.ErrnoError(63);
        }
        return parent.node_ops.symlink(parent, newname, oldpath);
      },rename:(old_path, new_path) => {
        var old_dirname = PATH.dirname(old_path);
        var new_dirname = PATH.dirname(new_path);
        var old_name = PATH.basename(old_path);
        var new_name = PATH.basename(new_path);
        // parents must exist
        var lookup, old_dir, new_dir;
  
        // let the errors from non existant directories percolate up
        lookup = FS.lookupPath(old_path, { parent: true });
        old_dir = lookup.node;
        lookup = FS.lookupPath(new_path, { parent: true });
        new_dir = lookup.node;
  
        if (!old_dir || !new_dir) throw new FS.ErrnoError(44);
        // need to be part of the same mount
        if (old_dir.mount !== new_dir.mount) {
          throw new FS.ErrnoError(75);
        }
        // source must exist
        var old_node = FS.lookupNode(old_dir, old_name);
        // old path should not be an ancestor of the new path
        var relative = PATH_FS.relative(old_path, new_dirname);
        if (relative.charAt(0) !== '.') {
          throw new FS.ErrnoError(28);
        }
        // new path should not be an ancestor of the old path
        relative = PATH_FS.relative(new_path, old_dirname);
        if (relative.charAt(0) !== '.') {
          throw new FS.ErrnoError(55);
        }
        // see if the new path already exists
        var new_node;
        try {
          new_node = FS.lookupNode(new_dir, new_name);
        } catch (e) {
          // not fatal
        }
        // early out if nothing needs to change
        if (old_node === new_node) {
          return;
        }
        // we'll need to delete the old entry
        var isdir = FS.isDir(old_node.mode);
        var errCode = FS.mayDelete(old_dir, old_name, isdir);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        // need delete permissions if we'll be overwriting.
        // need create permissions if new doesn't already exist.
        errCode = new_node ?
          FS.mayDelete(new_dir, new_name, isdir) :
          FS.mayCreate(new_dir, new_name);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        if (!old_dir.node_ops.rename) {
          throw new FS.ErrnoError(63);
        }
        if (FS.isMountpoint(old_node) || (new_node && FS.isMountpoint(new_node))) {
          throw new FS.ErrnoError(10);
        }
        // if we are going to change the parent, check write permissions
        if (new_dir !== old_dir) {
          errCode = FS.nodePermissions(old_dir, 'w');
          if (errCode) {
            throw new FS.ErrnoError(errCode);
          }
        }
        // remove the node from the lookup hash
        FS.hashRemoveNode(old_node);
        // do the underlying fs rename
        try {
          old_dir.node_ops.rename(old_node, new_dir, new_name);
        } catch (e) {
          throw e;
        } finally {
          // add the node back to the hash (in case node_ops.rename
          // changed its name)
          FS.hashAddNode(old_node);
        }
      },rmdir:(path) => {
        var lookup = FS.lookupPath(path, { parent: true });
        var parent = lookup.node;
        var name = PATH.basename(path);
        var node = FS.lookupNode(parent, name);
        var errCode = FS.mayDelete(parent, name, true);
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        if (!parent.node_ops.rmdir) {
          throw new FS.ErrnoError(63);
        }
        if (FS.isMountpoint(node)) {
          throw new FS.ErrnoError(10);
        }
        parent.node_ops.rmdir(parent, name);
        FS.destroyNode(node);
      },readdir:(path) => {
        var lookup = FS.lookupPath(path, { follow: true });
        var node = lookup.node;
        if (!node.node_ops.readdir) {
          throw new FS.ErrnoError(54);
        }
        return node.node_ops.readdir(node);
      },unlink:(path) => {
        var lookup = FS.lookupPath(path, { parent: true });
        var parent = lookup.node;
        if (!parent) {
          throw new FS.ErrnoError(44);
        }
        var name = PATH.basename(path);
        var node = FS.lookupNode(parent, name);
        var errCode = FS.mayDelete(parent, name, false);
        if (errCode) {
          // According to POSIX, we should map EISDIR to EPERM, but
          // we instead do what Linux does (and we must, as we use
          // the musl linux libc).
          throw new FS.ErrnoError(errCode);
        }
        if (!parent.node_ops.unlink) {
          throw new FS.ErrnoError(63);
        }
        if (FS.isMountpoint(node)) {
          throw new FS.ErrnoError(10);
        }
        parent.node_ops.unlink(parent, name);
        FS.destroyNode(node);
      },readlink:(path) => {
        var lookup = FS.lookupPath(path);
        var link = lookup.node;
        if (!link) {
          throw new FS.ErrnoError(44);
        }
        if (!link.node_ops.readlink) {
          throw new FS.ErrnoError(28);
        }
        return PATH_FS.resolve(FS.getPath(link.parent), link.node_ops.readlink(link));
      },stat:(path, dontFollow) => {
        var lookup = FS.lookupPath(path, { follow: !dontFollow });
        var node = lookup.node;
        if (!node) {
          throw new FS.ErrnoError(44);
        }
        if (!node.node_ops.getattr) {
          throw new FS.ErrnoError(63);
        }
        return node.node_ops.getattr(node);
      },lstat:(path) => {
        return FS.stat(path, true);
      },chmod:(path, mode, dontFollow) => {
        var node;
        if (typeof path == 'string') {
          var lookup = FS.lookupPath(path, { follow: !dontFollow });
          node = lookup.node;
        } else {
          node = path;
        }
        if (!node.node_ops.setattr) {
          throw new FS.ErrnoError(63);
        }
        node.node_ops.setattr(node, {
          mode: (mode & 4095) | (node.mode & ~4095),
          timestamp: Date.now()
        });
      },lchmod:(path, mode) => {
        FS.chmod(path, mode, true);
      },fchmod:(fd, mode) => {
        var stream = FS.getStream(fd);
        if (!stream) {
          throw new FS.ErrnoError(8);
        }
        FS.chmod(stream.node, mode);
      },chown:(path, uid, gid, dontFollow) => {
        var node;
        if (typeof path == 'string') {
          var lookup = FS.lookupPath(path, { follow: !dontFollow });
          node = lookup.node;
        } else {
          node = path;
        }
        if (!node.node_ops.setattr) {
          throw new FS.ErrnoError(63);
        }
        node.node_ops.setattr(node, {
          timestamp: Date.now()
          // we ignore the uid / gid for now
        });
      },lchown:(path, uid, gid) => {
        FS.chown(path, uid, gid, true);
      },fchown:(fd, uid, gid) => {
        var stream = FS.getStream(fd);
        if (!stream) {
          throw new FS.ErrnoError(8);
        }
        FS.chown(stream.node, uid, gid);
      },truncate:(path, len) => {
        if (len < 0) {
          throw new FS.ErrnoError(28);
        }
        var node;
        if (typeof path == 'string') {
          var lookup = FS.lookupPath(path, { follow: true });
          node = lookup.node;
        } else {
          node = path;
        }
        if (!node.node_ops.setattr) {
          throw new FS.ErrnoError(63);
        }
        if (FS.isDir(node.mode)) {
          throw new FS.ErrnoError(31);
        }
        if (!FS.isFile(node.mode)) {
          throw new FS.ErrnoError(28);
        }
        var errCode = FS.nodePermissions(node, 'w');
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        node.node_ops.setattr(node, {
          size: len,
          timestamp: Date.now()
        });
      },ftruncate:(fd, len) => {
        var stream = FS.getStream(fd);
        if (!stream) {
          throw new FS.ErrnoError(8);
        }
        if ((stream.flags & 2097155) === 0) {
          throw new FS.ErrnoError(28);
        }
        FS.truncate(stream.node, len);
      },utime:(path, atime, mtime) => {
        var lookup = FS.lookupPath(path, { follow: true });
        var node = lookup.node;
        node.node_ops.setattr(node, {
          timestamp: Math.max(atime, mtime)
        });
      },open:(path, flags, mode) => {
        if (path === "") {
          throw new FS.ErrnoError(44);
        }
        flags = typeof flags == 'string' ? FS.modeStringToFlags(flags) : flags;
        mode = typeof mode == 'undefined' ? 438 /* 0666 */ : mode;
        if ((flags & 64)) {
          mode = (mode & 4095) | 32768;
        } else {
          mode = 0;
        }
        var node;
        if (typeof path == 'object') {
          node = path;
        } else {
          path = PATH.normalize(path);
          try {
            var lookup = FS.lookupPath(path, {
              follow: !(flags & 131072)
            });
            node = lookup.node;
          } catch (e) {
            // ignore
          }
        }
        // perhaps we need to create the node
        var created = false;
        if ((flags & 64)) {
          if (node) {
            // if O_CREAT and O_EXCL are set, error out if the node already exists
            if ((flags & 128)) {
              throw new FS.ErrnoError(20);
            }
          } else {
            // node doesn't exist, try to create it
            node = FS.mknod(path, mode, 0);
            created = true;
          }
        }
        if (!node) {
          throw new FS.ErrnoError(44);
        }
        // can't truncate a device
        if (FS.isChrdev(node.mode)) {
          flags &= ~512;
        }
        // if asked only for a directory, then this must be one
        if ((flags & 65536) && !FS.isDir(node.mode)) {
          throw new FS.ErrnoError(54);
        }
        // check permissions, if this is not a file we just created now (it is ok to
        // create and write to a file with read-only permissions; it is read-only
        // for later use)
        if (!created) {
          var errCode = FS.mayOpen(node, flags);
          if (errCode) {
            throw new FS.ErrnoError(errCode);
          }
        }
        // do truncation if necessary
        if ((flags & 512) && !created) {
          FS.truncate(node, 0);
        }
        // we've already handled these, don't pass down to the underlying vfs
        flags &= ~(128 | 512 | 131072);
  
        // register the stream with the filesystem
        var stream = FS.createStream({
          node: node,
          path: FS.getPath(node),  // we want the absolute path to the node
          flags: flags,
          seekable: true,
          position: 0,
          stream_ops: node.stream_ops,
          // used by the file family libc calls (fopen, fwrite, ferror, etc.)
          ungotten: [],
          error: false
        });
        // call the new stream's open function
        if (stream.stream_ops.open) {
          stream.stream_ops.open(stream);
        }
        if (Module['logReadFiles'] && !(flags & 1)) {
          if (!FS.readFiles) FS.readFiles = {};
          if (!(path in FS.readFiles)) {
            FS.readFiles[path] = 1;
          }
        }
        return stream;
      },close:(stream) => {
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if (stream.getdents) stream.getdents = null; // free readdir state
        try {
          if (stream.stream_ops.close) {
            stream.stream_ops.close(stream);
          }
        } catch (e) {
          throw e;
        } finally {
          FS.closeStream(stream.fd);
        }
        stream.fd = null;
      },isClosed:(stream) => {
        return stream.fd === null;
      },llseek:(stream, offset, whence) => {
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if (!stream.seekable || !stream.stream_ops.llseek) {
          throw new FS.ErrnoError(70);
        }
        if (whence != 0 && whence != 1 && whence != 2) {
          throw new FS.ErrnoError(28);
        }
        stream.position = stream.stream_ops.llseek(stream, offset, whence);
        stream.ungotten = [];
        return stream.position;
      },read:(stream, buffer, offset, length, position) => {
        if (length < 0 || position < 0) {
          throw new FS.ErrnoError(28);
        }
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if ((stream.flags & 2097155) === 1) {
          throw new FS.ErrnoError(8);
        }
        if (FS.isDir(stream.node.mode)) {
          throw new FS.ErrnoError(31);
        }
        if (!stream.stream_ops.read) {
          throw new FS.ErrnoError(28);
        }
        var seeking = typeof position != 'undefined';
        if (!seeking) {
          position = stream.position;
        } else if (!stream.seekable) {
          throw new FS.ErrnoError(70);
        }
        var bytesRead = stream.stream_ops.read(stream, buffer, offset, length, position);
        if (!seeking) stream.position += bytesRead;
        return bytesRead;
      },write:(stream, buffer, offset, length, position, canOwn) => {
        if (length < 0 || position < 0) {
          throw new FS.ErrnoError(28);
        }
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if ((stream.flags & 2097155) === 0) {
          throw new FS.ErrnoError(8);
        }
        if (FS.isDir(stream.node.mode)) {
          throw new FS.ErrnoError(31);
        }
        if (!stream.stream_ops.write) {
          throw new FS.ErrnoError(28);
        }
        if (stream.seekable && stream.flags & 1024) {
          // seek to the end before writing in append mode
          FS.llseek(stream, 0, 2);
        }
        var seeking = typeof position != 'undefined';
        if (!seeking) {
          position = stream.position;
        } else if (!stream.seekable) {
          throw new FS.ErrnoError(70);
        }
        var bytesWritten = stream.stream_ops.write(stream, buffer, offset, length, position, canOwn);
        if (!seeking) stream.position += bytesWritten;
        return bytesWritten;
      },allocate:(stream, offset, length) => {
        if (FS.isClosed(stream)) {
          throw new FS.ErrnoError(8);
        }
        if (offset < 0 || length <= 0) {
          throw new FS.ErrnoError(28);
        }
        if ((stream.flags & 2097155) === 0) {
          throw new FS.ErrnoError(8);
        }
        if (!FS.isFile(stream.node.mode) && !FS.isDir(stream.node.mode)) {
          throw new FS.ErrnoError(43);
        }
        if (!stream.stream_ops.allocate) {
          throw new FS.ErrnoError(138);
        }
        stream.stream_ops.allocate(stream, offset, length);
      },mmap:(stream, length, position, prot, flags) => {
        // User requests writing to file (prot & PROT_WRITE != 0).
        // Checking if we have permissions to write to the file unless
        // MAP_PRIVATE flag is set. According to POSIX spec it is possible
        // to write to file opened in read-only mode with MAP_PRIVATE flag,
        // as all modifications will be visible only in the memory of
        // the current process.
        if ((prot & 2) !== 0
            && (flags & 2) === 0
            && (stream.flags & 2097155) !== 2) {
          throw new FS.ErrnoError(2);
        }
        if ((stream.flags & 2097155) === 1) {
          throw new FS.ErrnoError(2);
        }
        if (!stream.stream_ops.mmap) {
          throw new FS.ErrnoError(43);
        }
        return stream.stream_ops.mmap(stream, length, position, prot, flags);
      },msync:(stream, buffer, offset, length, mmapFlags) => {
        if (!stream.stream_ops.msync) {
          return 0;
        }
        return stream.stream_ops.msync(stream, buffer, offset, length, mmapFlags);
      },munmap:(stream) => 0,ioctl:(stream, cmd, arg) => {
        if (!stream.stream_ops.ioctl) {
          throw new FS.ErrnoError(59);
        }
        return stream.stream_ops.ioctl(stream, cmd, arg);
      },readFile:(path, opts = {}) => {
        opts.flags = opts.flags || 0;
        opts.encoding = opts.encoding || 'binary';
        if (opts.encoding !== 'utf8' && opts.encoding !== 'binary') {
          throw new Error('Invalid encoding type "' + opts.encoding + '"');
        }
        var ret;
        var stream = FS.open(path, opts.flags);
        var stat = FS.stat(path);
        var length = stat.size;
        var buf = new Uint8Array(length);
        FS.read(stream, buf, 0, length, 0);
        if (opts.encoding === 'utf8') {
          ret = UTF8ArrayToString(buf, 0);
        } else if (opts.encoding === 'binary') {
          ret = buf;
        }
        FS.close(stream);
        return ret;
      },writeFile:(path, data, opts = {}) => {
        opts.flags = opts.flags || 577;
        var stream = FS.open(path, opts.flags, opts.mode);
        if (typeof data == 'string') {
          var buf = new Uint8Array(lengthBytesUTF8(data)+1);
          var actualNumBytes = stringToUTF8Array(data, buf, 0, buf.length);
          FS.write(stream, buf, 0, actualNumBytes, undefined, opts.canOwn);
        } else if (ArrayBuffer.isView(data)) {
          FS.write(stream, data, 0, data.byteLength, undefined, opts.canOwn);
        } else {
          throw new Error('Unsupported data type');
        }
        FS.close(stream);
      },cwd:() => FS.currentPath,chdir:(path) => {
        var lookup = FS.lookupPath(path, { follow: true });
        if (lookup.node === null) {
          throw new FS.ErrnoError(44);
        }
        if (!FS.isDir(lookup.node.mode)) {
          throw new FS.ErrnoError(54);
        }
        var errCode = FS.nodePermissions(lookup.node, 'x');
        if (errCode) {
          throw new FS.ErrnoError(errCode);
        }
        FS.currentPath = lookup.path;
      },createDefaultDirectories:() => {
        FS.mkdir('/tmp');
        FS.mkdir('/home');
        FS.mkdir('/home/web_user');
      },createDefaultDevices:() => {
        // create /dev
        FS.mkdir('/dev');
        // setup /dev/null
        FS.registerDevice(FS.makedev(1, 3), {
          read: () => 0,
          write: (stream, buffer, offset, length, pos) => length,
        });
        FS.mkdev('/dev/null', FS.makedev(1, 3));
        // setup /dev/tty and /dev/tty1
        // stderr needs to print output using err() rather than out()
        // so we register a second tty just for it.
        TTY.register(FS.makedev(5, 0), TTY.default_tty_ops);
        TTY.register(FS.makedev(6, 0), TTY.default_tty1_ops);
        FS.mkdev('/dev/tty', FS.makedev(5, 0));
        FS.mkdev('/dev/tty1', FS.makedev(6, 0));
        // setup /dev/[u]random
        var random_device = getRandomDevice();
        FS.createDevice('/dev', 'random', random_device);
        FS.createDevice('/dev', 'urandom', random_device);
        // we're not going to emulate the actual shm device,
        // just create the tmp dirs that reside in it commonly
        FS.mkdir('/dev/shm');
        FS.mkdir('/dev/shm/tmp');
      },createSpecialDirectories:() => {
        // create /proc/self/fd which allows /proc/self/fd/6 => readlink gives the
        // name of the stream for fd 6 (see test_unistd_ttyname)
        FS.mkdir('/proc');
        var proc_self = FS.mkdir('/proc/self');
        FS.mkdir('/proc/self/fd');
        FS.mount({
          mount: () => {
            var node = FS.createNode(proc_self, 'fd', 16384 | 511 /* 0777 */, 73);
            node.node_ops = {
              lookup: (parent, name) => {
                var fd = +name;
                var stream = FS.getStream(fd);
                if (!stream) throw new FS.ErrnoError(8);
                var ret = {
                  parent: null,
                  mount: { mountpoint: 'fake' },
                  node_ops: { readlink: () => stream.path },
                };
                ret.parent = ret; // make it look like a simple root node
                return ret;
              }
            };
            return node;
          }
        }, {}, '/proc/self/fd');
      },createStandardStreams:() => {
        // TODO deprecate the old functionality of a single
        // input / output callback and that utilizes FS.createDevice
        // and instead require a unique set of stream ops
  
        // by default, we symlink the standard streams to the
        // default tty devices. however, if the standard streams
        // have been overwritten we create a unique device for
        // them instead.
        if (Module['stdin']) {
          FS.createDevice('/dev', 'stdin', Module['stdin']);
        } else {
          FS.symlink('/dev/tty', '/dev/stdin');
        }
        if (Module['stdout']) {
          FS.createDevice('/dev', 'stdout', null, Module['stdout']);
        } else {
          FS.symlink('/dev/tty', '/dev/stdout');
        }
        if (Module['stderr']) {
          FS.createDevice('/dev', 'stderr', null, Module['stderr']);
        } else {
          FS.symlink('/dev/tty1', '/dev/stderr');
        }
  
        // open default streams for the stdin, stdout and stderr devices
        var stdin = FS.open('/dev/stdin', 0);
        var stdout = FS.open('/dev/stdout', 1);
        var stderr = FS.open('/dev/stderr', 1);
        assert(stdin.fd === 0, 'invalid handle for stdin (' + stdin.fd + ')');
        assert(stdout.fd === 1, 'invalid handle for stdout (' + stdout.fd + ')');
        assert(stderr.fd === 2, 'invalid handle for stderr (' + stderr.fd + ')');
      },ensureErrnoError:() => {
        if (FS.ErrnoError) return;
        FS.ErrnoError = /** @this{Object} */ function ErrnoError(errno, node) {
          // We set the `name` property to be able to identify `FS.ErrnoError`
          // - the `name` is a standard ECMA-262 property of error objects. Kind of good to have it anyway.
          // - when using PROXYFS, an error can come from an underlying FS
          // as different FS objects have their own FS.ErrnoError each,
          // the test `err instanceof FS.ErrnoError` won't detect an error coming from another filesystem, causing bugs.
          // we'll use the reliable test `err.name == "ErrnoError"` instead
          this.name = 'ErrnoError';
          this.node = node;
          this.setErrno = /** @this{Object} */ function(errno) {
            this.errno = errno;
            for (var key in ERRNO_CODES) {
              if (ERRNO_CODES[key] === errno) {
                this.code = key;
                break;
              }
            }
          };
          this.setErrno(errno);
          this.message = ERRNO_MESSAGES[errno];
  
          // Try to get a maximally helpful stack trace. On Node.js, getting Error.stack
          // now ensures it shows what we want.
          if (this.stack) {
            // Define the stack property for Node.js 4, which otherwise errors on the next line.
            Object.defineProperty(this, "stack", { value: (new Error).stack, writable: true });
            this.stack = demangleAll(this.stack);
          }
        };
        FS.ErrnoError.prototype = new Error();
        FS.ErrnoError.prototype.constructor = FS.ErrnoError;
        // Some errors may happen quite a bit, to avoid overhead we reuse them (and suffer a lack of stack info)
        [44].forEach((code) => {
          FS.genericErrors[code] = new FS.ErrnoError(code);
          FS.genericErrors[code].stack = '<generic error, no stack>';
        });
      },staticInit:() => {
        FS.ensureErrnoError();
  
        FS.nameTable = new Array(4096);
  
        FS.mount(MEMFS, {}, '/');
  
        FS.createDefaultDirectories();
        FS.createDefaultDevices();
        FS.createSpecialDirectories();
  
        FS.filesystems = {
          'MEMFS': MEMFS,
        };
      },init:(input, output, error) => {
        assert(!FS.init.initialized, 'FS.init was previously called. If you want to initialize later with custom parameters, remove any earlier calls (note that one is automatically added to the generated code)');
        FS.init.initialized = true;
  
        FS.ensureErrnoError();
  
        // Allow Module.stdin etc. to provide defaults, if none explicitly passed to us here
        Module['stdin'] = input || Module['stdin'];
        Module['stdout'] = output || Module['stdout'];
        Module['stderr'] = error || Module['stderr'];
  
        FS.createStandardStreams();
      },quit:() => {
        FS.init.initialized = false;
        // force-flush all streams, so we get musl std streams printed out
        _fflush(0);
        // close all of our streams
        for (var i = 0; i < FS.streams.length; i++) {
          var stream = FS.streams[i];
          if (!stream) {
            continue;
          }
          FS.close(stream);
        }
      },getMode:(canRead, canWrite) => {
        var mode = 0;
        if (canRead) mode |= 292 | 73;
        if (canWrite) mode |= 146;
        return mode;
      },findObject:(path, dontResolveLastLink) => {
        var ret = FS.analyzePath(path, dontResolveLastLink);
        if (!ret.exists) {
          return null;
        }
        return ret.object;
      },analyzePath:(path, dontResolveLastLink) => {
        // operate from within the context of the symlink's target
        try {
          var lookup = FS.lookupPath(path, { follow: !dontResolveLastLink });
          path = lookup.path;
        } catch (e) {
        }
        var ret = {
          isRoot: false, exists: false, error: 0, name: null, path: null, object: null,
          parentExists: false, parentPath: null, parentObject: null
        };
        try {
          var lookup = FS.lookupPath(path, { parent: true });
          ret.parentExists = true;
          ret.parentPath = lookup.path;
          ret.parentObject = lookup.node;
          ret.name = PATH.basename(path);
          lookup = FS.lookupPath(path, { follow: !dontResolveLastLink });
          ret.exists = true;
          ret.path = lookup.path;
          ret.object = lookup.node;
          ret.name = lookup.node.name;
          ret.isRoot = lookup.path === '/';
        } catch (e) {
          ret.error = e.errno;
        };
        return ret;
      },createPath:(parent, path, canRead, canWrite) => {
        parent = typeof parent == 'string' ? parent : FS.getPath(parent);
        var parts = path.split('/').reverse();
        while (parts.length) {
          var part = parts.pop();
          if (!part) continue;
          var current = PATH.join2(parent, part);
          try {
            FS.mkdir(current);
          } catch (e) {
            // ignore EEXIST
          }
          parent = current;
        }
        return current;
      },createFile:(parent, name, properties, canRead, canWrite) => {
        var path = PATH.join2(typeof parent == 'string' ? parent : FS.getPath(parent), name);
        var mode = FS.getMode(canRead, canWrite);
        return FS.create(path, mode);
      },createDataFile:(parent, name, data, canRead, canWrite, canOwn) => {
        var path = name;
        if (parent) {
          parent = typeof parent == 'string' ? parent : FS.getPath(parent);
          path = name ? PATH.join2(parent, name) : parent;
        }
        var mode = FS.getMode(canRead, canWrite);
        var node = FS.create(path, mode);
        if (data) {
          if (typeof data == 'string') {
            var arr = new Array(data.length);
            for (var i = 0, len = data.length; i < len; ++i) arr[i] = data.charCodeAt(i);
            data = arr;
          }
          // make sure we can write to the file
          FS.chmod(node, mode | 146);
          var stream = FS.open(node, 577);
          FS.write(stream, data, 0, data.length, 0, canOwn);
          FS.close(stream);
          FS.chmod(node, mode);
        }
        return node;
      },createDevice:(parent, name, input, output) => {
        var path = PATH.join2(typeof parent == 'string' ? parent : FS.getPath(parent), name);
        var mode = FS.getMode(!!input, !!output);
        if (!FS.createDevice.major) FS.createDevice.major = 64;
        var dev = FS.makedev(FS.createDevice.major++, 0);
        // Create a fake device that a set of stream ops to emulate
        // the old behavior.
        FS.registerDevice(dev, {
          open: (stream) => {
            stream.seekable = false;
          },
          close: (stream) => {
            // flush any pending line data
            if (output && output.buffer && output.buffer.length) {
              output(10);
            }
          },
          read: (stream, buffer, offset, length, pos /* ignored */) => {
            var bytesRead = 0;
            for (var i = 0; i < length; i++) {
              var result;
              try {
                result = input();
              } catch (e) {
                throw new FS.ErrnoError(29);
              }
              if (result === undefined && bytesRead === 0) {
                throw new FS.ErrnoError(6);
              }
              if (result === null || result === undefined) break;
              bytesRead++;
              buffer[offset+i] = result;
            }
            if (bytesRead) {
              stream.node.timestamp = Date.now();
            }
            return bytesRead;
          },
          write: (stream, buffer, offset, length, pos) => {
            for (var i = 0; i < length; i++) {
              try {
                output(buffer[offset+i]);
              } catch (e) {
                throw new FS.ErrnoError(29);
              }
            }
            if (length) {
              stream.node.timestamp = Date.now();
            }
            return i;
          }
        });
        return FS.mkdev(path, mode, dev);
      },forceLoadFile:(obj) => {
        if (obj.isDevice || obj.isFolder || obj.link || obj.contents) return true;
        if (typeof XMLHttpRequest != 'undefined') {
          throw new Error("Lazy loading should have been performed (contents set) in createLazyFile, but it was not. Lazy loading only works in web workers. Use --embed-file or --preload-file in emcc on the main thread.");
        } else if (read_) {
          // Command-line.
          try {
            // WARNING: Can't read binary files in V8's d8 or tracemonkey's js, as
            //          read() will try to parse UTF8.
            obj.contents = intArrayFromString(read_(obj.url), true);
            obj.usedBytes = obj.contents.length;
          } catch (e) {
            throw new FS.ErrnoError(29);
          }
        } else {
          throw new Error('Cannot load without read() or XMLHttpRequest.');
        }
      },createLazyFile:(parent, name, url, canRead, canWrite) => {
        // Lazy chunked Uint8Array (implements get and length from Uint8Array). Actual getting is abstracted away for eventual reuse.
        /** @constructor */
        function LazyUint8Array() {
          this.lengthKnown = false;
          this.chunks = []; // Loaded chunks. Index is the chunk number
        }
        LazyUint8Array.prototype.get = /** @this{Object} */ function LazyUint8Array_get(idx) {
          if (idx > this.length-1 || idx < 0) {
            return undefined;
          }
          var chunkOffset = idx % this.chunkSize;
          var chunkNum = (idx / this.chunkSize)|0;
          return this.getter(chunkNum)[chunkOffset];
        };
        LazyUint8Array.prototype.setDataGetter = function LazyUint8Array_setDataGetter(getter) {
          this.getter = getter;
        };
        LazyUint8Array.prototype.cacheLength = function LazyUint8Array_cacheLength() {
          // Find length
          var xhr = new XMLHttpRequest();
          xhr.open('HEAD', url, false);
          xhr.send(null);
          if (!(xhr.status >= 200 && xhr.status < 300 || xhr.status === 304)) throw new Error("Couldn't load " + url + ". Status: " + xhr.status);
          var datalength = Number(xhr.getResponseHeader("Content-length"));
          var header;
          var hasByteServing = (header = xhr.getResponseHeader("Accept-Ranges")) && header === "bytes";
          var usesGzip = (header = xhr.getResponseHeader("Content-Encoding")) && header === "gzip";
  
          var chunkSize = 1024*1024; // Chunk size in bytes
  
          if (!hasByteServing) chunkSize = datalength;
  
          // Function to get a range from the remote URL.
          var doXHR = (from, to) => {
            if (from > to) throw new Error("invalid range (" + from + ", " + to + ") or no bytes requested!");
            if (to > datalength-1) throw new Error("only " + datalength + " bytes available! programmer error!");
  
            // TODO: Use mozResponseArrayBuffer, responseStream, etc. if available.
            var xhr = new XMLHttpRequest();
            xhr.open('GET', url, false);
            if (datalength !== chunkSize) xhr.setRequestHeader("Range", "bytes=" + from + "-" + to);
  
            // Some hints to the browser that we want binary data.
            xhr.responseType = 'arraybuffer';
            if (xhr.overrideMimeType) {
              xhr.overrideMimeType('text/plain; charset=x-user-defined');
            }
  
            xhr.send(null);
            if (!(xhr.status >= 200 && xhr.status < 300 || xhr.status === 304)) throw new Error("Couldn't load " + url + ". Status: " + xhr.status);
            if (xhr.response !== undefined) {
              return new Uint8Array(/** @type{Array<number>} */(xhr.response || []));
            }
            return intArrayFromString(xhr.responseText || '', true);
          };
          var lazyArray = this;
          lazyArray.setDataGetter((chunkNum) => {
            var start = chunkNum * chunkSize;
            var end = (chunkNum+1) * chunkSize - 1; // including this byte
            end = Math.min(end, datalength-1); // if datalength-1 is selected, this is the last block
            if (typeof lazyArray.chunks[chunkNum] == 'undefined') {
              lazyArray.chunks[chunkNum] = doXHR(start, end);
            }
            if (typeof lazyArray.chunks[chunkNum] == 'undefined') throw new Error('doXHR failed!');
            return lazyArray.chunks[chunkNum];
          });
  
          if (usesGzip || !datalength) {
            // if the server uses gzip or doesn't supply the length, we have to download the whole file to get the (uncompressed) length
            chunkSize = datalength = 1; // this will force getter(0)/doXHR do download the whole file
            datalength = this.getter(0).length;
            chunkSize = datalength;
            out("LazyFiles on gzip forces download of the whole file when length is accessed");
          }
  
          this._length = datalength;
          this._chunkSize = chunkSize;
          this.lengthKnown = true;
        };
        if (typeof XMLHttpRequest != 'undefined') {
          if (!ENVIRONMENT_IS_WORKER) throw 'Cannot do synchronous binary XHRs outside webworkers in modern browsers. Use --embed-file or --preload-file in emcc';
          var lazyArray = new LazyUint8Array();
          Object.defineProperties(lazyArray, {
            length: {
              get: /** @this{Object} */ function() {
                if (!this.lengthKnown) {
                  this.cacheLength();
                }
                return this._length;
              }
            },
            chunkSize: {
              get: /** @this{Object} */ function() {
                if (!this.lengthKnown) {
                  this.cacheLength();
                }
                return this._chunkSize;
              }
            }
          });
  
          var properties = { isDevice: false, contents: lazyArray };
        } else {
          var properties = { isDevice: false, url: url };
        }
  
        var node = FS.createFile(parent, name, properties, canRead, canWrite);
        // This is a total hack, but I want to get this lazy file code out of the
        // core of MEMFS. If we want to keep this lazy file concept I feel it should
        // be its own thin LAZYFS proxying calls to MEMFS.
        if (properties.contents) {
          node.contents = properties.contents;
        } else if (properties.url) {
          node.contents = null;
          node.url = properties.url;
        }
        // Add a function that defers querying the file size until it is asked the first time.
        Object.defineProperties(node, {
          usedBytes: {
            get: /** @this {FSNode} */ function() { return this.contents.length; }
          }
        });
        // override each stream op with one that tries to force load the lazy file first
        var stream_ops = {};
        var keys = Object.keys(node.stream_ops);
        keys.forEach((key) => {
          var fn = node.stream_ops[key];
          stream_ops[key] = function forceLoadLazyFile() {
            FS.forceLoadFile(node);
            return fn.apply(null, arguments);
          };
        });
        function writeChunks(stream, buffer, offset, length, position) {
          var contents = stream.node.contents;
          if (position >= contents.length)
            return 0;
          var size = Math.min(contents.length - position, length);
          assert(size >= 0);
          if (contents.slice) { // normal array
            for (var i = 0; i < size; i++) {
              buffer[offset + i] = contents[position + i];
            }
          } else {
            for (var i = 0; i < size; i++) { // LazyUint8Array from sync binary XHR
              buffer[offset + i] = contents.get(position + i);
            }
          }
          return size;
        }
        // use a custom read function
        stream_ops.read = (stream, buffer, offset, length, position) => {
          FS.forceLoadFile(node);
          return writeChunks(stream, buffer, offset, length, position)
        };
        // use a custom mmap function
        stream_ops.mmap = (stream, length, position, prot, flags) => {
          FS.forceLoadFile(node);
          var ptr = mmapAlloc(length);
          if (!ptr) {
            throw new FS.ErrnoError(48);
          }
          writeChunks(stream, HEAP8, ptr, length, position);
          return { ptr: ptr, allocated: true };
        };
        node.stream_ops = stream_ops;
        return node;
      },createPreloadedFile:(parent, name, url, canRead, canWrite, onload, onerror, dontCreateFile, canOwn, preFinish) => {
        // TODO we should allow people to just pass in a complete filename instead
        // of parent and name being that we just join them anyways
        var fullname = name ? PATH_FS.resolve(PATH.join2(parent, name)) : parent;
        var dep = getUniqueRunDependency('cp ' + fullname); // might have several active requests for the same fullname
        function processData(byteArray) {
          function finish(byteArray) {
            if (preFinish) preFinish();
            if (!dontCreateFile) {
              FS.createDataFile(parent, name, byteArray, canRead, canWrite, canOwn);
            }
            if (onload) onload();
            removeRunDependency(dep);
          }
          if (Browser.handledByPreloadPlugin(byteArray, fullname, finish, () => {
            if (onerror) onerror();
            removeRunDependency(dep);
          })) {
            return;
          }
          finish(byteArray);
        }
        addRunDependency(dep);
        if (typeof url == 'string') {
          asyncLoad(url, (byteArray) => processData(byteArray), onerror);
        } else {
          processData(url);
        }
      },indexedDB:() => {
        return window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
      },DB_NAME:() => {
        return 'EM_FS_' + window.location.pathname;
      },DB_VERSION:20,DB_STORE_NAME:"FILE_DATA",saveFilesToDB:(paths, onload = (() => {}), onerror = (() => {})) => {
        var indexedDB = FS.indexedDB();
        try {
          var openRequest = indexedDB.open(FS.DB_NAME(), FS.DB_VERSION);
        } catch (e) {
          return onerror(e);
        }
        openRequest.onupgradeneeded = () => {
          out('creating db');
          var db = openRequest.result;
          db.createObjectStore(FS.DB_STORE_NAME);
        };
        openRequest.onsuccess = () => {
          var db = openRequest.result;
          var transaction = db.transaction([FS.DB_STORE_NAME], 'readwrite');
          var files = transaction.objectStore(FS.DB_STORE_NAME);
          var ok = 0, fail = 0, total = paths.length;
          function finish() {
            if (fail == 0) onload(); else onerror();
          }
          paths.forEach((path) => {
            var putRequest = files.put(FS.analyzePath(path).object.contents, path);
            putRequest.onsuccess = () => { ok++; if (ok + fail == total) finish() };
            putRequest.onerror = () => { fail++; if (ok + fail == total) finish() };
          });
          transaction.onerror = onerror;
        };
        openRequest.onerror = onerror;
      },loadFilesFromDB:(paths, onload = (() => {}), onerror = (() => {})) => {
        var indexedDB = FS.indexedDB();
        try {
          var openRequest = indexedDB.open(FS.DB_NAME(), FS.DB_VERSION);
        } catch (e) {
          return onerror(e);
        }
        openRequest.onupgradeneeded = onerror; // no database to load from
        openRequest.onsuccess = () => {
          var db = openRequest.result;
          try {
            var transaction = db.transaction([FS.DB_STORE_NAME], 'readonly');
          } catch(e) {
            onerror(e);
            return;
          }
          var files = transaction.objectStore(FS.DB_STORE_NAME);
          var ok = 0, fail = 0, total = paths.length;
          function finish() {
            if (fail == 0) onload(); else onerror();
          }
          paths.forEach((path) => {
            var getRequest = files.get(path);
            getRequest.onsuccess = () => {
              if (FS.analyzePath(path).exists) {
                FS.unlink(path);
              }
              FS.createDataFile(PATH.dirname(path), PATH.basename(path), getRequest.result, true, true, true);
              ok++;
              if (ok + fail == total) finish();
            };
            getRequest.onerror = () => { fail++; if (ok + fail == total) finish() };
          });
          transaction.onerror = onerror;
        };
        openRequest.onerror = onerror;
      },absolutePath:() => {
        abort('FS.absolutePath has been removed; use PATH_FS.resolve instead');
      },createFolder:() => {
        abort('FS.createFolder has been removed; use FS.mkdir instead');
      },createLink:() => {
        abort('FS.createLink has been removed; use FS.symlink instead');
      },joinPath:() => {
        abort('FS.joinPath has been removed; use PATH.join instead');
      },mmapAlloc:() => {
        abort('FS.mmapAlloc has been replaced by the top level function mmapAlloc');
      },standardizePath:() => {
        abort('FS.standardizePath has been removed; use PATH.normalize instead');
      }};
  var SYSCALLS = {DEFAULT_POLLMASK:5,calculateAt:function(dirfd, path, allowEmpty) {
        if (PATH.isAbs(path)) {
          return path;
        }
        // relative path
        var dir;
        if (dirfd === -100) {
          dir = FS.cwd();
        } else {
          var dirstream = SYSCALLS.getStreamFromFD(dirfd);
          dir = dirstream.path;
        }
        if (path.length == 0) {
          if (!allowEmpty) {
            throw new FS.ErrnoError(44);;
          }
          return dir;
        }
        return PATH.join2(dir, path);
      },doStat:function(func, path, buf) {
        try {
          var stat = func(path);
        } catch (e) {
          if (e && e.node && PATH.normalize(path) !== PATH.normalize(FS.getPath(e.node))) {
            // an error occurred while trying to look up the path; we should just report ENOTDIR
            return -54;
          }
          throw e;
        }
        HEAP32[((buf)>>2)] = stat.dev;
        HEAP32[(((buf)+(8))>>2)] = stat.ino;
        HEAP32[(((buf)+(12))>>2)] = stat.mode;
        HEAPU32[(((buf)+(16))>>2)] = stat.nlink;
        HEAP32[(((buf)+(20))>>2)] = stat.uid;
        HEAP32[(((buf)+(24))>>2)] = stat.gid;
        HEAP32[(((buf)+(28))>>2)] = stat.rdev;
        (tempI64 = [stat.size>>>0,(tempDouble=stat.size,(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[(((buf)+(40))>>2)] = tempI64[0],HEAP32[(((buf)+(44))>>2)] = tempI64[1]);
        HEAP32[(((buf)+(48))>>2)] = 4096;
        HEAP32[(((buf)+(52))>>2)] = stat.blocks;
        var atime = stat.atime.getTime();
        var mtime = stat.mtime.getTime();
        var ctime = stat.ctime.getTime();
        (tempI64 = [Math.floor(atime / 1000)>>>0,(tempDouble=Math.floor(atime / 1000),(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[(((buf)+(56))>>2)] = tempI64[0],HEAP32[(((buf)+(60))>>2)] = tempI64[1]);
        HEAPU32[(((buf)+(64))>>2)] = (atime % 1000) * 1000;
        (tempI64 = [Math.floor(mtime / 1000)>>>0,(tempDouble=Math.floor(mtime / 1000),(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[(((buf)+(72))>>2)] = tempI64[0],HEAP32[(((buf)+(76))>>2)] = tempI64[1]);
        HEAPU32[(((buf)+(80))>>2)] = (mtime % 1000) * 1000;
        (tempI64 = [Math.floor(ctime / 1000)>>>0,(tempDouble=Math.floor(ctime / 1000),(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[(((buf)+(88))>>2)] = tempI64[0],HEAP32[(((buf)+(92))>>2)] = tempI64[1]);
        HEAPU32[(((buf)+(96))>>2)] = (ctime % 1000) * 1000;
        (tempI64 = [stat.ino>>>0,(tempDouble=stat.ino,(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[(((buf)+(104))>>2)] = tempI64[0],HEAP32[(((buf)+(108))>>2)] = tempI64[1]);
        return 0;
      },doMsync:function(addr, stream, len, flags, offset) {
        if (!FS.isFile(stream.node.mode)) {
          throw new FS.ErrnoError(43);
        }
        if (flags & 2) {
          // MAP_PRIVATE calls need not to be synced back to underlying fs
          return 0;
        }
        var buffer = HEAPU8.slice(addr, addr + len);
        FS.msync(stream, buffer, offset, len, flags);
      },varargs:undefined,get:function() {
        assert(SYSCALLS.varargs != undefined);
        SYSCALLS.varargs += 4;
        var ret = HEAP32[(((SYSCALLS.varargs)-(4))>>2)];
        return ret;
      },getStr:function(ptr) {
        var ret = UTF8ToString(ptr);
        return ret;
      },getStreamFromFD:function(fd) {
        var stream = FS.getStream(fd);
        if (!stream) throw new FS.ErrnoError(8);
        return stream;
      }};
  function ___syscall_fcntl64(fd, cmd, varargs) {
  SYSCALLS.varargs = varargs;
  try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      switch (cmd) {
        case 0: {
          var arg = SYSCALLS.get();
          if (arg < 0) {
            return -28;
          }
          var newStream;
          newStream = FS.createStream(stream, arg);
          return newStream.fd;
        }
        case 1:
        case 2:
          return 0;  // FD_CLOEXEC makes no sense for a single process.
        case 3:
          return stream.flags;
        case 4: {
          var arg = SYSCALLS.get();
          stream.flags |= arg;
          return 0;
        }
        case 5:
        /* case 5: Currently in musl F_GETLK64 has same value as F_GETLK, so omitted to avoid duplicate case blocks. If that changes, uncomment this */ {
          
          var arg = SYSCALLS.get();
          var offset = 0;
          // We're always unlocked.
          HEAP16[(((arg)+(offset))>>1)] = 2;
          return 0;
        }
        case 6:
        case 7:
        /* case 6: Currently in musl F_SETLK64 has same value as F_SETLK, so omitted to avoid duplicate case blocks. If that changes, uncomment this */
        /* case 7: Currently in musl F_SETLKW64 has same value as F_SETLKW, so omitted to avoid duplicate case blocks. If that changes, uncomment this */
          
          
          return 0; // Pretend that the locking is successful.
        case 16:
        case 8:
          return -28; // These are for sockets. We don't have them fully implemented yet.
        case 9:
          // musl trusts getown return values, due to a bug where they must be, as they overlap with errors. just return -1 here, so fcntl() returns that, and we set errno ourselves.
          setErrNo(28);
          return -1;
        default: {
          return -28;
        }
      }
    } catch (e) {
    if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;
    return -e.errno;
  }
  }

  function ___syscall_ioctl(fd, op, varargs) {
  SYSCALLS.varargs = varargs;
  try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      switch (op) {
        case 21509:
        case 21505: {
          if (!stream.tty) return -59;
          return 0;
        }
        case 21510:
        case 21511:
        case 21512:
        case 21506:
        case 21507:
        case 21508: {
          if (!stream.tty) return -59;
          return 0; // no-op, not actually adjusting terminal settings
        }
        case 21519: {
          if (!stream.tty) return -59;
          var argp = SYSCALLS.get();
          HEAP32[((argp)>>2)] = 0;
          return 0;
        }
        case 21520: {
          if (!stream.tty) return -59;
          return -28; // not supported
        }
        case 21531: {
          var argp = SYSCALLS.get();
          return FS.ioctl(stream, op, argp);
        }
        case 21523: {
          // TODO: in theory we should write to the winsize struct that gets
          // passed in, but for now musl doesn't read anything on it
          if (!stream.tty) return -59;
          return 0;
        }
        case 21524: {
          // TODO: technically, this ioctl call should change the window size.
          // but, since emscripten doesn't have any concept of a terminal window
          // yet, we'll just silently throw it away as we do TIOCGWINSZ
          if (!stream.tty) return -59;
          return 0;
        }
        default: return -28; // not supported
      }
    } catch (e) {
    if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;
    return -e.errno;
  }
  }

  function ___syscall_openat(dirfd, path, flags, varargs) {
  SYSCALLS.varargs = varargs;
  try {
  
      path = SYSCALLS.getStr(path);
      path = SYSCALLS.calculateAt(dirfd, path);
      var mode = varargs ? SYSCALLS.get() : 0;
      return FS.open(path, flags, mode).fd;
    } catch (e) {
    if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;
    return -e.errno;
  }
  }

  var SOCKFS = {mount:function(mount) {
        // If Module['websocket'] has already been defined (e.g. for configuring
        // the subprotocol/url) use that, if not initialise it to a new object.
        Module['websocket'] = (Module['websocket'] &&
                               ('object' === typeof Module['websocket'])) ? Module['websocket'] : {};
  
        // Add the Event registration mechanism to the exported websocket configuration
        // object so we can register network callbacks from native JavaScript too.
        // For more documentation see system/include/emscripten/emscripten.h
        Module['websocket']._callbacks = {};
        Module['websocket']['on'] = /** @this{Object} */ function(event, callback) {
          if ('function' === typeof callback) {
            this._callbacks[event] = callback;
          }
          return this;
        };
  
        Module['websocket'].emit = /** @this{Object} */ function(event, param) {
          if ('function' === typeof this._callbacks[event]) {
            this._callbacks[event].call(this, param);
          }
        };
  
        // If debug is enabled register simple default logging callbacks for each Event.
  
        return FS.createNode(null, '/', 16384 | 511 /* 0777 */, 0);
      },createSocket:function(family, type, protocol) {
        type &= ~526336; // Some applications may pass it; it makes no sense for a single process.
        var streaming = type == 1;
        if (streaming && protocol && protocol != 6) {
          throw new FS.ErrnoError(66); // if SOCK_STREAM, must be tcp or 0.
        }
  
        // create our internal socket structure
        var sock = {
          family: family,
          type: type,
          protocol: protocol,
          server: null,
          error: null, // Used in getsockopt for SOL_SOCKET/SO_ERROR test
          peers: {},
          pending: [],
          recv_queue: [],
          sock_ops: SOCKFS.websocket_sock_ops
        };
  
        // create the filesystem node to store the socket structure
        var name = SOCKFS.nextname();
        var node = FS.createNode(SOCKFS.root, name, 49152, 0);
        node.sock = sock;
  
        // and the wrapping stream that enables library functions such
        // as read and write to indirectly interact with the socket
        var stream = FS.createStream({
          path: name,
          node: node,
          flags: 2,
          seekable: false,
          stream_ops: SOCKFS.stream_ops
        });
  
        // map the new stream to the socket structure (sockets have a 1:1
        // relationship with a stream)
        sock.stream = stream;
  
        return sock;
      },getSocket:function(fd) {
        var stream = FS.getStream(fd);
        if (!stream || !FS.isSocket(stream.node.mode)) {
          return null;
        }
        return stream.node.sock;
      },stream_ops:{poll:function(stream) {
          var sock = stream.node.sock;
          return sock.sock_ops.poll(sock);
        },ioctl:function(stream, request, varargs) {
          var sock = stream.node.sock;
          return sock.sock_ops.ioctl(sock, request, varargs);
        },read:function(stream, buffer, offset, length, position /* ignored */) {
          var sock = stream.node.sock;
          var msg = sock.sock_ops.recvmsg(sock, length);
          if (!msg) {
            // socket is closed
            return 0;
          }
          buffer.set(msg.buffer, offset);
          return msg.buffer.length;
        },write:function(stream, buffer, offset, length, position /* ignored */) {
          var sock = stream.node.sock;
          return sock.sock_ops.sendmsg(sock, buffer, offset, length);
        },close:function(stream) {
          var sock = stream.node.sock;
          sock.sock_ops.close(sock);
        }},nextname:function() {
        if (!SOCKFS.nextname.current) {
          SOCKFS.nextname.current = 0;
        }
        return 'socket[' + (SOCKFS.nextname.current++) + ']';
      },websocket_sock_ops:{createPeer:function(sock, addr, port) {
          var ws;
  
          if (typeof addr == 'object') {
            ws = addr;
            addr = null;
            port = null;
          }
  
          if (ws) {
            // for sockets that've already connected (e.g. we're the server)
            // we can inspect the _socket property for the address
            if (ws._socket) {
              addr = ws._socket.remoteAddress;
              port = ws._socket.remotePort;
            }
            // if we're just now initializing a connection to the remote,
            // inspect the url property
            else {
              var result = /ws[s]?:\/\/([^:]+):(\d+)/.exec(ws.url);
              if (!result) {
                throw new Error('WebSocket URL must be in the format ws(s)://address:port');
              }
              addr = result[1];
              port = parseInt(result[2], 10);
            }
          } else {
            // create the actual websocket object and connect
            try {
              // runtimeConfig gets set to true if WebSocket runtime configuration is available.
              var runtimeConfig = (Module['websocket'] && ('object' === typeof Module['websocket']));
  
              // The default value is 'ws://' the replace is needed because the compiler replaces '//' comments with '#'
              // comments without checking context, so we'd end up with ws:#, the replace swaps the '#' for '//' again.
              var url = 'ws:#'.replace('#', '//');
  
              if (runtimeConfig) {
                if ('string' === typeof Module['websocket']['url']) {
                  url = Module['websocket']['url']; // Fetch runtime WebSocket URL config.
                }
              }
  
              if (url === 'ws://' || url === 'wss://') { // Is the supplied URL config just a prefix, if so complete it.
                var parts = addr.split('/');
                url = url + parts[0] + ":" + port + "/" + parts.slice(1).join('/');
              }
  
              // Make the WebSocket subprotocol (Sec-WebSocket-Protocol) default to binary if no configuration is set.
              var subProtocols = 'binary'; // The default value is 'binary'
  
              if (runtimeConfig) {
                if ('string' === typeof Module['websocket']['subprotocol']) {
                  subProtocols = Module['websocket']['subprotocol']; // Fetch runtime WebSocket subprotocol config.
                }
              }
  
              // The default WebSocket options
              var opts = undefined;
  
              if (subProtocols !== 'null') {
                // The regex trims the string (removes spaces at the beginning and end, then splits the string by
                // <any space>,<any space> into an Array. Whitespace removal is important for Websockify and ws.
                subProtocols = subProtocols.replace(/^ +| +$/g,"").split(/ *, */);
  
                opts = subProtocols;
              }
  
              // some webservers (azure) does not support subprotocol header
              if (runtimeConfig && null === Module['websocket']['subprotocol']) {
                subProtocols = 'null';
                opts = undefined;
              }
  
              // If node we use the ws library.
              var WebSocketConstructor;
              if (ENVIRONMENT_IS_NODE) {
                WebSocketConstructor = /** @type{(typeof WebSocket)} */(require('ws'));
              } else
              {
                WebSocketConstructor = WebSocket;
              }
              ws = new WebSocketConstructor(url, opts);
              ws.binaryType = 'arraybuffer';
            } catch (e) {
              throw new FS.ErrnoError(23);
            }
          }
  
          var peer = {
            addr: addr,
            port: port,
            socket: ws,
            dgram_send_queue: []
          };
  
          SOCKFS.websocket_sock_ops.addPeer(sock, peer);
          SOCKFS.websocket_sock_ops.handlePeerEvents(sock, peer);
  
          // if this is a bound dgram socket, send the port number first to allow
          // us to override the ephemeral port reported to us by remotePort on the
          // remote end.
          if (sock.type === 2 && typeof sock.sport != 'undefined') {
            peer.dgram_send_queue.push(new Uint8Array([
                255, 255, 255, 255,
                'p'.charCodeAt(0), 'o'.charCodeAt(0), 'r'.charCodeAt(0), 't'.charCodeAt(0),
                ((sock.sport & 0xff00) >> 8) , (sock.sport & 0xff)
            ]));
          }
  
          return peer;
        },getPeer:function(sock, addr, port) {
          return sock.peers[addr + ':' + port];
        },addPeer:function(sock, peer) {
          sock.peers[peer.addr + ':' + peer.port] = peer;
        },removePeer:function(sock, peer) {
          delete sock.peers[peer.addr + ':' + peer.port];
        },handlePeerEvents:function(sock, peer) {
          var first = true;
  
          var handleOpen = function () {
  
            Module['websocket'].emit('open', sock.stream.fd);
  
            try {
              var queued = peer.dgram_send_queue.shift();
              while (queued) {
                peer.socket.send(queued);
                queued = peer.dgram_send_queue.shift();
              }
            } catch (e) {
              // not much we can do here in the way of proper error handling as we've already
              // lied and said this data was sent. shut it down.
              peer.socket.close();
            }
          };
  
          function handleMessage(data) {
            if (typeof data == 'string') {
              var encoder = new TextEncoder(); // should be utf-8
              data = encoder.encode(data); // make a typed array from the string
            } else {
              assert(data.byteLength !== undefined); // must receive an ArrayBuffer
              if (data.byteLength == 0) {
                // An empty ArrayBuffer will emit a pseudo disconnect event
                // as recv/recvmsg will return zero which indicates that a socket
                // has performed a shutdown although the connection has not been disconnected yet.
                return;
              }
              data = new Uint8Array(data); // make a typed array view on the array buffer
            }
  
            // if this is the port message, override the peer's port with it
            var wasfirst = first;
            first = false;
            if (wasfirst &&
                data.length === 10 &&
                data[0] === 255 && data[1] === 255 && data[2] === 255 && data[3] === 255 &&
                data[4] === 'p'.charCodeAt(0) && data[5] === 'o'.charCodeAt(0) && data[6] === 'r'.charCodeAt(0) && data[7] === 't'.charCodeAt(0)) {
              // update the peer's port and it's key in the peer map
              var newport = ((data[8] << 8) | data[9]);
              SOCKFS.websocket_sock_ops.removePeer(sock, peer);
              peer.port = newport;
              SOCKFS.websocket_sock_ops.addPeer(sock, peer);
              return;
            }
  
            sock.recv_queue.push({ addr: peer.addr, port: peer.port, data: data });
            Module['websocket'].emit('message', sock.stream.fd);
          };
  
          if (ENVIRONMENT_IS_NODE) {
            peer.socket.on('open', handleOpen);
            peer.socket.on('message', function(data, isBinary) {
              if (!isBinary) {
                return;
              }
              handleMessage((new Uint8Array(data)).buffer); // copy from node Buffer -> ArrayBuffer
            });
            peer.socket.on('close', function() {
              Module['websocket'].emit('close', sock.stream.fd);
            });
            peer.socket.on('error', function(error) {
              // Although the ws library may pass errors that may be more descriptive than
              // ECONNREFUSED they are not necessarily the expected error code e.g.
              // ENOTFOUND on getaddrinfo seems to be node.js specific, so using ECONNREFUSED
              // is still probably the most useful thing to do.
              sock.error = 14; // Used in getsockopt for SOL_SOCKET/SO_ERROR test.
              Module['websocket'].emit('error', [sock.stream.fd, sock.error, 'ECONNREFUSED: Connection refused']);
              // don't throw
            });
          } else {
            peer.socket.onopen = handleOpen;
            peer.socket.onclose = function() {
              Module['websocket'].emit('close', sock.stream.fd);
            };
            peer.socket.onmessage = function peer_socket_onmessage(event) {
              handleMessage(event.data);
            };
            peer.socket.onerror = function(error) {
              // The WebSocket spec only allows a 'simple event' to be thrown on error,
              // so we only really know as much as ECONNREFUSED.
              sock.error = 14; // Used in getsockopt for SOL_SOCKET/SO_ERROR test.
              Module['websocket'].emit('error', [sock.stream.fd, sock.error, 'ECONNREFUSED: Connection refused']);
            };
          }
        },poll:function(sock) {
          if (sock.type === 1 && sock.server) {
            // listen sockets should only say they're available for reading
            // if there are pending clients.
            return sock.pending.length ? (64 | 1) : 0;
          }
  
          var mask = 0;
          var dest = sock.type === 1 ?  // we only care about the socket state for connection-based sockets
            SOCKFS.websocket_sock_ops.getPeer(sock, sock.daddr, sock.dport) :
            null;
  
          if (sock.recv_queue.length ||
              !dest ||  // connection-less sockets are always ready to read
              (dest && dest.socket.readyState === dest.socket.CLOSING) ||
              (dest && dest.socket.readyState === dest.socket.CLOSED)) {  // let recv return 0 once closed
            mask |= (64 | 1);
          }
  
          if (!dest ||  // connection-less sockets are always ready to write
              (dest && dest.socket.readyState === dest.socket.OPEN)) {
            mask |= 4;
          }
  
          if ((dest && dest.socket.readyState === dest.socket.CLOSING) ||
              (dest && dest.socket.readyState === dest.socket.CLOSED)) {
            mask |= 16;
          }
  
          return mask;
        },ioctl:function(sock, request, arg) {
          switch (request) {
            case 21531:
              var bytes = 0;
              if (sock.recv_queue.length) {
                bytes = sock.recv_queue[0].data.length;
              }
              HEAP32[((arg)>>2)] = bytes;
              return 0;
            default:
              return 28;
          }
        },close:function(sock) {
          // if we've spawned a listen server, close it
          if (sock.server) {
            try {
              sock.server.close();
            } catch (e) {
            }
            sock.server = null;
          }
          // close any peer connections
          var peers = Object.keys(sock.peers);
          for (var i = 0; i < peers.length; i++) {
            var peer = sock.peers[peers[i]];
            try {
              peer.socket.close();
            } catch (e) {
            }
            SOCKFS.websocket_sock_ops.removePeer(sock, peer);
          }
          return 0;
        },bind:function(sock, addr, port) {
          if (typeof sock.saddr != 'undefined' || typeof sock.sport != 'undefined') {
            throw new FS.ErrnoError(28);  // already bound
          }
          sock.saddr = addr;
          sock.sport = port;
          // in order to emulate dgram sockets, we need to launch a listen server when
          // binding on a connection-less socket
          // note: this is only required on the server side
          if (sock.type === 2) {
            // close the existing server if it exists
            if (sock.server) {
              sock.server.close();
              sock.server = null;
            }
            // swallow error operation not supported error that occurs when binding in the
            // browser where this isn't supported
            try {
              sock.sock_ops.listen(sock, 0);
            } catch (e) {
              if (!(e.name === 'ErrnoError')) throw e;
              if (e.errno !== 138) throw e;
            }
          }
        },connect:function(sock, addr, port) {
          if (sock.server) {
            throw new FS.ErrnoError(138);
          }
  
          // TODO autobind
          // if (!sock.addr && sock.type == 2) {
          // }
  
          // early out if we're already connected / in the middle of connecting
          if (typeof sock.daddr != 'undefined' && typeof sock.dport != 'undefined') {
            var dest = SOCKFS.websocket_sock_ops.getPeer(sock, sock.daddr, sock.dport);
            if (dest) {
              if (dest.socket.readyState === dest.socket.CONNECTING) {
                throw new FS.ErrnoError(7);
              } else {
                throw new FS.ErrnoError(30);
              }
            }
          }
  
          // add the socket to our peer list and set our
          // destination address / port to match
          var peer = SOCKFS.websocket_sock_ops.createPeer(sock, addr, port);
          sock.daddr = peer.addr;
          sock.dport = peer.port;
  
          // always "fail" in non-blocking mode
          throw new FS.ErrnoError(26);
        },listen:function(sock, backlog) {
          if (!ENVIRONMENT_IS_NODE) {
            throw new FS.ErrnoError(138);
          }
          if (sock.server) {
             throw new FS.ErrnoError(28);  // already listening
          }
          var WebSocketServer = require('ws').Server;
          var host = sock.saddr;
          sock.server = new WebSocketServer({
            host: host,
            port: sock.sport
            // TODO support backlog
          });
          Module['websocket'].emit('listen', sock.stream.fd); // Send Event with listen fd.
  
          sock.server.on('connection', function(ws) {
            if (sock.type === 1) {
              var newsock = SOCKFS.createSocket(sock.family, sock.type, sock.protocol);
  
              // create a peer on the new socket
              var peer = SOCKFS.websocket_sock_ops.createPeer(newsock, ws);
              newsock.daddr = peer.addr;
              newsock.dport = peer.port;
  
              // push to queue for accept to pick up
              sock.pending.push(newsock);
              Module['websocket'].emit('connection', newsock.stream.fd);
            } else {
              // create a peer on the listen socket so calling sendto
              // with the listen socket and an address will resolve
              // to the correct client
              SOCKFS.websocket_sock_ops.createPeer(sock, ws);
              Module['websocket'].emit('connection', sock.stream.fd);
            }
          });
          sock.server.on('close', function() {
            Module['websocket'].emit('close', sock.stream.fd);
            sock.server = null;
          });
          sock.server.on('error', function(error) {
            // Although the ws library may pass errors that may be more descriptive than
            // ECONNREFUSED they are not necessarily the expected error code e.g.
            // ENOTFOUND on getaddrinfo seems to be node.js specific, so using EHOSTUNREACH
            // is still probably the most useful thing to do. This error shouldn't
            // occur in a well written app as errors should get trapped in the compiled
            // app's own getaddrinfo call.
            sock.error = 23; // Used in getsockopt for SOL_SOCKET/SO_ERROR test.
            Module['websocket'].emit('error', [sock.stream.fd, sock.error, 'EHOSTUNREACH: Host is unreachable']);
            // don't throw
          });
        },accept:function(listensock) {
          if (!listensock.server || !listensock.pending.length) {
            throw new FS.ErrnoError(28);
          }
          var newsock = listensock.pending.shift();
          newsock.stream.flags = listensock.stream.flags;
          return newsock;
        },getname:function(sock, peer) {
          var addr, port;
          if (peer) {
            if (sock.daddr === undefined || sock.dport === undefined) {
              throw new FS.ErrnoError(53);
            }
            addr = sock.daddr;
            port = sock.dport;
          } else {
            // TODO saddr and sport will be set for bind()'d UDP sockets, but what
            // should we be returning for TCP sockets that've been connect()'d?
            addr = sock.saddr || 0;
            port = sock.sport || 0;
          }
          return { addr: addr, port: port };
        },sendmsg:function(sock, buffer, offset, length, addr, port) {
          if (sock.type === 2) {
            // connection-less sockets will honor the message address,
            // and otherwise fall back to the bound destination address
            if (addr === undefined || port === undefined) {
              addr = sock.daddr;
              port = sock.dport;
            }
            // if there was no address to fall back to, error out
            if (addr === undefined || port === undefined) {
              throw new FS.ErrnoError(17);
            }
          } else {
            // connection-based sockets will only use the bound
            addr = sock.daddr;
            port = sock.dport;
          }
  
          // find the peer for the destination address
          var dest = SOCKFS.websocket_sock_ops.getPeer(sock, addr, port);
  
          // early out if not connected with a connection-based socket
          if (sock.type === 1) {
            if (!dest || dest.socket.readyState === dest.socket.CLOSING || dest.socket.readyState === dest.socket.CLOSED) {
              throw new FS.ErrnoError(53);
            } else if (dest.socket.readyState === dest.socket.CONNECTING) {
              throw new FS.ErrnoError(6);
            }
          }
  
          // create a copy of the incoming data to send, as the WebSocket API
          // doesn't work entirely with an ArrayBufferView, it'll just send
          // the entire underlying buffer
          if (ArrayBuffer.isView(buffer)) {
            offset += buffer.byteOffset;
            buffer = buffer.buffer;
          }
  
          var data;
            data = buffer.slice(offset, offset + length);
  
          // if we're emulating a connection-less dgram socket and don't have
          // a cached connection, queue the buffer to send upon connect and
          // lie, saying the data was sent now.
          if (sock.type === 2) {
            if (!dest || dest.socket.readyState !== dest.socket.OPEN) {
              // if we're not connected, open a new connection
              if (!dest || dest.socket.readyState === dest.socket.CLOSING || dest.socket.readyState === dest.socket.CLOSED) {
                dest = SOCKFS.websocket_sock_ops.createPeer(sock, addr, port);
              }
              dest.dgram_send_queue.push(data);
              return length;
            }
          }
  
          try {
            // send the actual data
            dest.socket.send(data);
            return length;
          } catch (e) {
            throw new FS.ErrnoError(28);
          }
        },recvmsg:function(sock, length) {
          // http://pubs.opengroup.org/onlinepubs/7908799/xns/recvmsg.html
          if (sock.type === 1 && sock.server) {
            // tcp servers should not be recv()'ing on the listen socket
            throw new FS.ErrnoError(53);
          }
  
          var queued = sock.recv_queue.shift();
          if (!queued) {
            if (sock.type === 1) {
              var dest = SOCKFS.websocket_sock_ops.getPeer(sock, sock.daddr, sock.dport);
  
              if (!dest) {
                // if we have a destination address but are not connected, error out
                throw new FS.ErrnoError(53);
              }
              if (dest.socket.readyState === dest.socket.CLOSING || dest.socket.readyState === dest.socket.CLOSED) {
                // return null if the socket has closed
                return null;
              }
              // else, our socket is in a valid state but truly has nothing available
              throw new FS.ErrnoError(6);
            }
            throw new FS.ErrnoError(6);
          }
  
          // queued.data will be an ArrayBuffer if it's unadulterated, but if it's
          // requeued TCP data it'll be an ArrayBufferView
          var queuedLength = queued.data.byteLength || queued.data.length;
          var queuedOffset = queued.data.byteOffset || 0;
          var queuedBuffer = queued.data.buffer || queued.data;
          var bytesRead = Math.min(length, queuedLength);
          var res = {
            buffer: new Uint8Array(queuedBuffer, queuedOffset, bytesRead),
            addr: queued.addr,
            port: queued.port
          };
  
          // push back any unread data for TCP connections
          if (sock.type === 1 && bytesRead < queuedLength) {
            var bytesRemaining = queuedLength - bytesRead;
            queued.data = new Uint8Array(queuedBuffer, queuedOffset + bytesRead, bytesRemaining);
            sock.recv_queue.unshift(queued);
          }
  
          return res;
        }}};
  
  function getSocketFromFD(fd) {
      var socket = SOCKFS.getSocket(fd);
      if (!socket) throw new FS.ErrnoError(8);
      return socket;
    }
  
  var Sockets = {BUFFER_SIZE:10240,MAX_BUFFER_SIZE:10485760,nextFd:1,fds:{},nextport:1,maxport:65535,peer:null,connections:{},portmap:{},localAddr:4261412874,addrPool:[33554442,50331658,67108874,83886090,100663306,117440522,134217738,150994954,167772170,184549386,201326602,218103818,234881034]};
  
  function inetPton4(str) {
      var b = str.split('.');
      for (var i = 0; i < 4; i++) {
        var tmp = Number(b[i]);
        if (isNaN(tmp)) return null;
        b[i] = tmp;
      }
      return (b[0] | (b[1] << 8) | (b[2] << 16) | (b[3] << 24)) >>> 0;
    }
  
  
  /** @suppress {checkTypes} */
  function jstoi_q(str) {
      return parseInt(str);
    }
  function inetPton6(str) {
      var words;
      var w, offset, z, i;
      /* http://home.deds.nl/~aeron/regex/ */
      var valid6regx = /^((?=.*::)(?!.*::.+::)(::)?([\dA-F]{1,4}:(:|\b)|){5}|([\dA-F]{1,4}:){6})((([\dA-F]{1,4}((?!\3)::|:\b|$))|(?!\2\3)){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i
      var parts = [];
      if (!valid6regx.test(str)) {
        return null;
      }
      if (str === "::") {
        return [0, 0, 0, 0, 0, 0, 0, 0];
      }
      // Z placeholder to keep track of zeros when splitting the string on ":"
      if (str.startsWith("::")) {
        str = str.replace("::", "Z:"); // leading zeros case
      } else {
        str = str.replace("::", ":Z:");
      }
  
      if (str.indexOf(".") > 0) {
        // parse IPv4 embedded stress
        str = str.replace(new RegExp('[.]', 'g'), ":");
        words = str.split(":");
        words[words.length-4] = jstoi_q(words[words.length-4]) + jstoi_q(words[words.length-3])*256;
        words[words.length-3] = jstoi_q(words[words.length-2]) + jstoi_q(words[words.length-1])*256;
        words = words.slice(0, words.length-2);
      } else {
        words = str.split(":");
      }
  
      offset = 0; z = 0;
      for (w=0; w < words.length; w++) {
        if (typeof words[w] == 'string') {
          if (words[w] === 'Z') {
            // compressed zeros - write appropriate number of zero words
            for (z = 0; z < (8 - words.length+1); z++) {
              parts[w+z] = 0;
            }
            offset = z-1;
          } else {
            // parse hex to field to 16-bit value and write it in network byte-order
            parts[w+offset] = _htons(parseInt(words[w],16));
          }
        } else {
          // parsed IPv4 words
          parts[w+offset] = words[w];
        }
      }
      return [
        (parts[1] << 16) | parts[0],
        (parts[3] << 16) | parts[2],
        (parts[5] << 16) | parts[4],
        (parts[7] << 16) | parts[6]
      ];
    }
  
  /** @param {number=} addrlen */
  function writeSockaddr(sa, family, addr, port, addrlen) {
      switch (family) {
        case 2:
          addr = inetPton4(addr);
          zeroMemory(sa, 16);
          if (addrlen) {
            HEAP32[((addrlen)>>2)] = 16;
          }
          HEAP16[((sa)>>1)] = family;
          HEAP32[(((sa)+(4))>>2)] = addr;
          HEAP16[(((sa)+(2))>>1)] = _htons(port);
          break;
        case 10:
          addr = inetPton6(addr);
          zeroMemory(sa, 28);
          if (addrlen) {
            HEAP32[((addrlen)>>2)] = 28;
          }
          HEAP32[((sa)>>2)] = family;
          HEAP32[(((sa)+(8))>>2)] = addr[0];
          HEAP32[(((sa)+(12))>>2)] = addr[1];
          HEAP32[(((sa)+(16))>>2)] = addr[2];
          HEAP32[(((sa)+(20))>>2)] = addr[3];
          HEAP16[(((sa)+(2))>>1)] = _htons(port);
          break;
        default:
          return 5;
      }
      return 0;
    }
  
  
  var DNS = {address_map:{id:1,addrs:{},names:{}},lookup_name:function (name) {
        // If the name is already a valid ipv4 / ipv6 address, don't generate a fake one.
        var res = inetPton4(name);
        if (res !== null) {
          return name;
        }
        res = inetPton6(name);
        if (res !== null) {
          return name;
        }
  
        // See if this name is already mapped.
        var addr;
  
        if (DNS.address_map.addrs[name]) {
          addr = DNS.address_map.addrs[name];
        } else {
          var id = DNS.address_map.id++;
          assert(id < 65535, 'exceeded max address mappings of 65535');
  
          addr = '172.29.' + (id & 0xff) + '.' + (id & 0xff00);
  
          DNS.address_map.names[addr] = name;
          DNS.address_map.addrs[name] = addr;
        }
  
        return addr;
      },lookup_addr:function (addr) {
        if (DNS.address_map.names[addr]) {
          return DNS.address_map.names[addr];
        }
  
        return null;
      }};
  
  function ___syscall_recvfrom(fd, buf, len, flags, addr, addrlen) {
  try {
  
      var sock = getSocketFromFD(fd);
      var msg = sock.sock_ops.recvmsg(sock, len);
      if (!msg) return 0; // socket is closed
      if (addr) {
        var errno = writeSockaddr(addr, sock.family, DNS.lookup_name(msg.addr), msg.port, addrlen);
        assert(!errno);
      }
      HEAPU8.set(msg.buffer, buf);
      return msg.buffer.byteLength;
    } catch (e) {
    if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;
    return -e.errno;
  }
  }

  
  
  function inetNtop4(addr) {
      return (addr & 0xff) + '.' + ((addr >> 8) & 0xff) + '.' + ((addr >> 16) & 0xff) + '.' + ((addr >> 24) & 0xff)
    }
  
  
  function inetNtop6(ints) {
      //  ref:  http://www.ietf.org/rfc/rfc2373.txt - section 2.5.4
      //  Format for IPv4 compatible and mapped  128-bit IPv6 Addresses
      //  128-bits are split into eight 16-bit words
      //  stored in network byte order (big-endian)
      //  |                80 bits               | 16 |      32 bits        |
      //  +-----------------------------------------------------------------+
      //  |               10 bytes               |  2 |      4 bytes        |
      //  +--------------------------------------+--------------------------+
      //  +               5 words                |  1 |      2 words        |
      //  +--------------------------------------+--------------------------+
      //  |0000..............................0000|0000|    IPv4 ADDRESS     | (compatible)
      //  +--------------------------------------+----+---------------------+
      //  |0000..............................0000|FFFF|    IPv4 ADDRESS     | (mapped)
      //  +--------------------------------------+----+---------------------+
      var str = "";
      var word = 0;
      var longest = 0;
      var lastzero = 0;
      var zstart = 0;
      var len = 0;
      var i = 0;
      var parts = [
        ints[0] & 0xffff,
        (ints[0] >> 16),
        ints[1] & 0xffff,
        (ints[1] >> 16),
        ints[2] & 0xffff,
        (ints[2] >> 16),
        ints[3] & 0xffff,
        (ints[3] >> 16)
      ];
  
      // Handle IPv4-compatible, IPv4-mapped, loopback and any/unspecified addresses
  
      var hasipv4 = true;
      var v4part = "";
      // check if the 10 high-order bytes are all zeros (first 5 words)
      for (i = 0; i < 5; i++) {
        if (parts[i] !== 0) { hasipv4 = false; break; }
      }
  
      if (hasipv4) {
        // low-order 32-bits store an IPv4 address (bytes 13 to 16) (last 2 words)
        v4part = inetNtop4(parts[6] | (parts[7] << 16));
        // IPv4-mapped IPv6 address if 16-bit value (bytes 11 and 12) == 0xFFFF (6th word)
        if (parts[5] === -1) {
          str = "::ffff:";
          str += v4part;
          return str;
        }
        // IPv4-compatible IPv6 address if 16-bit value (bytes 11 and 12) == 0x0000 (6th word)
        if (parts[5] === 0) {
          str = "::";
          //special case IPv6 addresses
          if (v4part === "0.0.0.0") v4part = ""; // any/unspecified address
          if (v4part === "0.0.0.1") v4part = "1";// loopback address
          str += v4part;
          return str;
        }
      }
  
      // Handle all other IPv6 addresses
  
      // first run to find the longest contiguous zero words
      for (word = 0; word < 8; word++) {
        if (parts[word] === 0) {
          if (word - lastzero > 1) {
            len = 0;
          }
          lastzero = word;
          len++;
        }
        if (len > longest) {
          longest = len;
          zstart = word - longest + 1;
        }
      }
  
      for (word = 0; word < 8; word++) {
        if (longest > 1) {
          // compress contiguous zeros - to produce "::"
          if (parts[word] === 0 && word >= zstart && word < (zstart + longest) ) {
            if (word === zstart) {
              str += ":";
              if (zstart === 0) str += ":"; //leading zeros case
            }
            continue;
          }
        }
        // converts 16-bit words from big-endian to little-endian before converting to hex string
        str += Number(_ntohs(parts[word] & 0xffff)).toString(16);
        str += word < 7 ? ":" : "";
      }
      return str;
    }
  
  function readSockaddr(sa, salen) {
      // family / port offsets are common to both sockaddr_in and sockaddr_in6
      var family = HEAP16[((sa)>>1)];
      var port = _ntohs(HEAPU16[(((sa)+(2))>>1)]);
      var addr;
  
      switch (family) {
        case 2:
          if (salen !== 16) {
            return { errno: 28 };
          }
          addr = HEAP32[(((sa)+(4))>>2)];
          addr = inetNtop4(addr);
          break;
        case 10:
          if (salen !== 28) {
            return { errno: 28 };
          }
          addr = [
            HEAP32[(((sa)+(8))>>2)],
            HEAP32[(((sa)+(12))>>2)],
            HEAP32[(((sa)+(16))>>2)],
            HEAP32[(((sa)+(20))>>2)]
          ];
          addr = inetNtop6(addr);
          break;
        default:
          return { errno: 5 };
      }
  
      return { family: family, addr: addr, port: port };
    }
  
  
  /** @param {boolean=} allowNull */
  function getSocketAddress(addrp, addrlen, allowNull) {
      if (allowNull && addrp === 0) return null;
      var info = readSockaddr(addrp, addrlen);
      if (info.errno) throw new FS.ErrnoError(info.errno);
      info.addr = DNS.lookup_addr(info.addr) || info.addr;
      return info;
    }
  
  function ___syscall_sendto(fd, message, length, flags, addr, addr_len) {
  try {
  
      var sock = getSocketFromFD(fd);
      var dest = getSocketAddress(addr, addr_len, true);
      if (!dest) {
        // send, no address provided
        return FS.write(sock.stream, HEAP8,message, length);
      }
      // sendto an address
      return sock.sock_ops.sendmsg(sock, HEAP8,message, length, dest.addr, dest.port);
    } catch (e) {
    if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;
    return -e.errno;
  }
  }

  var nowIsMonotonic = true;;
  function __emscripten_get_now_is_monotonic() {
      return nowIsMonotonic;
    }

  function __emscripten_throw_longjmp() {
      throw Infinity;
    }

  function _abort() {
      abort('native code called abort()');
    }

  function _emscripten_set_main_loop_timing(mode, value) {
      Browser.mainLoop.timingMode = mode;
      Browser.mainLoop.timingValue = value;
  
      if (!Browser.mainLoop.func) {
        err('emscripten_set_main_loop_timing: Cannot set timing mode for main loop since a main loop does not exist! Call emscripten_set_main_loop first to set one up.');
        return 1; // Return non-zero on failure, can't set timing mode when there is no main loop.
      }
  
      if (!Browser.mainLoop.running) {
        
        Browser.mainLoop.running = true;
      }
      if (mode == 0 /*EM_TIMING_SETTIMEOUT*/) {
        Browser.mainLoop.scheduler = function Browser_mainLoop_scheduler_setTimeout() {
          var timeUntilNextTick = Math.max(0, Browser.mainLoop.tickStartTime + value - _emscripten_get_now())|0;
          setTimeout(Browser.mainLoop.runner, timeUntilNextTick); // doing this each time means that on exception, we stop
        };
        Browser.mainLoop.method = 'timeout';
      } else if (mode == 1 /*EM_TIMING_RAF*/) {
        Browser.mainLoop.scheduler = function Browser_mainLoop_scheduler_rAF() {
          Browser.requestAnimationFrame(Browser.mainLoop.runner);
        };
        Browser.mainLoop.method = 'rAF';
      } else if (mode == 2 /*EM_TIMING_SETIMMEDIATE*/) {
        if (typeof setImmediate == 'undefined') {
          // Emulate setImmediate. (note: not a complete polyfill, we don't emulate clearImmediate() to keep code size to minimum, since not needed)
          var setImmediates = [];
          var emscriptenMainLoopMessageId = 'setimmediate';
          /** @param {Event} event */
          var Browser_setImmediate_messageHandler = (event) => {
            // When called in current thread or Worker, the main loop ID is structured slightly different to accommodate for --proxy-to-worker runtime listening to Worker events,
            // so check for both cases.
            if (event.data === emscriptenMainLoopMessageId || event.data.target === emscriptenMainLoopMessageId) {
              event.stopPropagation();
              setImmediates.shift()();
            }
          };
          addEventListener("message", Browser_setImmediate_messageHandler, true);
          setImmediate = /** @type{function(function(): ?, ...?): number} */(function Browser_emulated_setImmediate(func) {
            setImmediates.push(func);
            if (ENVIRONMENT_IS_WORKER) {
              if (Module['setImmediates'] === undefined) Module['setImmediates'] = [];
              Module['setImmediates'].push(func);
              postMessage({target: emscriptenMainLoopMessageId}); // In --proxy-to-worker, route the message via proxyClient.js
            } else postMessage(emscriptenMainLoopMessageId, "*"); // On the main thread, can just send the message to itself.
          })
        }
        Browser.mainLoop.scheduler = function Browser_mainLoop_scheduler_setImmediate() {
          setImmediate(Browser.mainLoop.runner);
        };
        Browser.mainLoop.method = 'immediate';
      }
      return 0;
    }
  
  var _emscripten_get_now;if (ENVIRONMENT_IS_NODE) {
    _emscripten_get_now = () => {
      var t = process.hrtime();
      return t[0] * 1e3 + t[1] / 1e6;
    };
  } else _emscripten_get_now = () => performance.now();
  ;
  
  
    /**
     * @param {number=} arg
     * @param {boolean=} noSetTiming
     */
  function setMainLoop(browserIterationFunc, fps, simulateInfiniteLoop, arg, noSetTiming) {
      assert(!Browser.mainLoop.func, 'emscripten_set_main_loop: there can only be one main loop function at once: call emscripten_cancel_main_loop to cancel the previous one before setting a new one with different parameters.');
  
      Browser.mainLoop.func = browserIterationFunc;
      Browser.mainLoop.arg = arg;
  
      var thisMainLoopId = Browser.mainLoop.currentlyRunningMainloop;
      function checkIsRunning() {
        if (thisMainLoopId < Browser.mainLoop.currentlyRunningMainloop) {
          
          return false;
        }
        return true;
      }
  
      // We create the loop runner here but it is not actually running until
      // _emscripten_set_main_loop_timing is called (which might happen a
      // later time).  This member signifies that the current runner has not
      // yet been started so that we can call runtimeKeepalivePush when it
      // gets it timing set for the first time.
      Browser.mainLoop.running = false;
      Browser.mainLoop.runner = function Browser_mainLoop_runner() {
        if (ABORT) return;
        if (Browser.mainLoop.queue.length > 0) {
          var start = Date.now();
          var blocker = Browser.mainLoop.queue.shift();
          blocker.func(blocker.arg);
          if (Browser.mainLoop.remainingBlockers) {
            var remaining = Browser.mainLoop.remainingBlockers;
            var next = remaining%1 == 0 ? remaining-1 : Math.floor(remaining);
            if (blocker.counted) {
              Browser.mainLoop.remainingBlockers = next;
            } else {
              // not counted, but move the progress along a tiny bit
              next = next + 0.5; // do not steal all the next one's progress
              Browser.mainLoop.remainingBlockers = (8*remaining + next)/9;
            }
          }
          out('main loop blocker "' + blocker.name + '" took ' + (Date.now() - start) + ' ms'); //, left: ' + Browser.mainLoop.remainingBlockers);
          Browser.mainLoop.updateStatus();
  
          // catches pause/resume main loop from blocker execution
          if (!checkIsRunning()) return;
  
          setTimeout(Browser.mainLoop.runner, 0);
          return;
        }
  
        // catch pauses from non-main loop sources
        if (!checkIsRunning()) return;
  
        // Implement very basic swap interval control
        Browser.mainLoop.currentFrameNumber = Browser.mainLoop.currentFrameNumber + 1 | 0;
        if (Browser.mainLoop.timingMode == 1/*EM_TIMING_RAF*/ && Browser.mainLoop.timingValue > 1 && Browser.mainLoop.currentFrameNumber % Browser.mainLoop.timingValue != 0) {
          // Not the scheduled time to render this frame - skip.
          Browser.mainLoop.scheduler();
          return;
        } else if (Browser.mainLoop.timingMode == 0/*EM_TIMING_SETTIMEOUT*/) {
          Browser.mainLoop.tickStartTime = _emscripten_get_now();
        }
  
        // Signal GL rendering layer that processing of a new frame is about to start. This helps it optimize
        // VBO double-buffering and reduce GPU stalls.
        GL.newRenderingFrameStarted();
  
        if (Browser.mainLoop.method === 'timeout' && Module.ctx) {
          warnOnce('Looks like you are rendering without using requestAnimationFrame for the main loop. You should use 0 for the frame rate in emscripten_set_main_loop in order to use requestAnimationFrame, as that can greatly improve your frame rates!');
          Browser.mainLoop.method = ''; // just warn once per call to set main loop
        }
  
        Browser.mainLoop.runIter(browserIterationFunc);
  
        checkStackCookie();
  
        // catch pauses from the main loop itself
        if (!checkIsRunning()) return;
  
        // Queue new audio data. This is important to be right after the main loop invocation, so that we will immediately be able
        // to queue the newest produced audio samples.
        // TODO: Consider adding pre- and post- rAF callbacks so that GL.newRenderingFrameStarted() and SDL.audio.queueNewAudioData()
        //       do not need to be hardcoded into this function, but can be more generic.
        if (typeof SDL == 'object' && SDL.audio && SDL.audio.queueNewAudioData) SDL.audio.queueNewAudioData();
  
        Browser.mainLoop.scheduler();
      }
  
      if (!noSetTiming) {
        if (fps && fps > 0) _emscripten_set_main_loop_timing(0/*EM_TIMING_SETTIMEOUT*/, 1000.0 / fps);
        else _emscripten_set_main_loop_timing(1/*EM_TIMING_RAF*/, 1); // Do rAF by rendering each frame (no decimating)
  
        Browser.mainLoop.scheduler();
      }
  
      if (simulateInfiniteLoop) {
        throw 'unwind';
      }
    }
  
  function handleException(e) {
      // Certain exception types we do not treat as errors since they are used for
      // internal control flow.
      // 1. ExitStatus, which is thrown by exit()
      // 2. "unwind", which is thrown by emscripten_unwind_to_js_event_loop() and others
      //    that wish to return to JS event loop.
      if (e instanceof ExitStatus || e == 'unwind') {
        return EXITSTATUS;
      }
      checkStackCookie();
      if (e instanceof WebAssembly.RuntimeError) {
        if (_emscripten_stack_get_current() <= 0) {
          err('Stack overflow detected.  You can try increasing -sSTACK_SIZE (currently set to ' + 365536 + ')');
        }
      }
      quit_(1, e);
    }
  
  
  function _proc_exit(code) {
      EXITSTATUS = code;
      if (!keepRuntimeAlive()) {
        if (Module['onExit']) Module['onExit'](code);
        ABORT = true;
      }
      quit_(code, new ExitStatus(code));
    }
  /** @param {boolean|number=} implicit */
  function exitJS(status, implicit) {
      EXITSTATUS = status;
  
      checkUnflushedContent();
  
      // if exit() was called explicitly, warn the user if the runtime isn't actually being shut down
      if (keepRuntimeAlive() && !implicit) {
        var msg = 'program exited (with status: ' + status + '), but keepRuntimeAlive() is set (counter=' + runtimeKeepaliveCounter + ') due to an async operation, so halting execution but not exiting the runtime or preventing further async execution (you can use emscripten_force_exit, if you want to force a true shutdown)';
        err(msg);
      }
  
      _proc_exit(status);
    }
  var _exit = exitJS;
  
  function maybeExit() {
      if (!keepRuntimeAlive()) {
        try {
          _exit(EXITSTATUS);
        } catch (e) {
          handleException(e);
        }
      }
    }
  function callUserCallback(func) {
      if (ABORT) {
        err('user callback triggered after runtime exited or application aborted.  Ignoring.');
        return;
      }
      try {
        func();
        maybeExit();
      } catch (e) {
        handleException(e);
      }
    }
  
  /** @param {number=} timeout */
  function safeSetTimeout(func, timeout) {
      
      return setTimeout(function() {
        
        callUserCallback(func);
      }, timeout);
    }
  
  
  
  var Browser = {mainLoop:{running:false,scheduler:null,method:"",currentlyRunningMainloop:0,func:null,arg:0,timingMode:0,timingValue:0,currentFrameNumber:0,queue:[],pause:function() {
          Browser.mainLoop.scheduler = null;
          // Incrementing this signals the previous main loop that it's now become old, and it must return.
          Browser.mainLoop.currentlyRunningMainloop++;
        },resume:function() {
          Browser.mainLoop.currentlyRunningMainloop++;
          var timingMode = Browser.mainLoop.timingMode;
          var timingValue = Browser.mainLoop.timingValue;
          var func = Browser.mainLoop.func;
          Browser.mainLoop.func = null;
          // do not set timing and call scheduler, we will do it on the next lines
          setMainLoop(func, 0, false, Browser.mainLoop.arg, true);
          _emscripten_set_main_loop_timing(timingMode, timingValue);
          Browser.mainLoop.scheduler();
        },updateStatus:function() {
          if (Module['setStatus']) {
            var message = Module['statusMessage'] || 'Please wait...';
            var remaining = Browser.mainLoop.remainingBlockers;
            var expected = Browser.mainLoop.expectedBlockers;
            if (remaining) {
              if (remaining < expected) {
                Module['setStatus'](message + ' (' + (expected - remaining) + '/' + expected + ')');
              } else {
                Module['setStatus'](message);
              }
            } else {
              Module['setStatus']('');
            }
          }
        },runIter:function(func) {
          if (ABORT) return;
          if (Module['preMainLoop']) {
            var preRet = Module['preMainLoop']();
            if (preRet === false) {
              return; // |return false| skips a frame
            }
          }
          callUserCallback(func);
          if (Module['postMainLoop']) Module['postMainLoop']();
        }},isFullscreen:false,pointerLock:false,moduleContextCreatedCallbacks:[],workers:[],init:function() {
        if (!Module["preloadPlugins"]) Module["preloadPlugins"] = []; // needs to exist even in workers
  
        if (Browser.initted) return;
        Browser.initted = true;
  
        try {
          new Blob();
          Browser.hasBlobConstructor = true;
        } catch(e) {
          Browser.hasBlobConstructor = false;
          err("warning: no blob constructor, cannot create blobs with mimetypes");
        }
        Browser.BlobBuilder = typeof MozBlobBuilder != "undefined" ? MozBlobBuilder : (typeof WebKitBlobBuilder != "undefined" ? WebKitBlobBuilder : (!Browser.hasBlobConstructor ? err("warning: no BlobBuilder") : null));
        Browser.URLObject = typeof window != "undefined" ? (window.URL ? window.URL : window.webkitURL) : undefined;
        if (!Module.noImageDecoding && typeof Browser.URLObject == 'undefined') {
          err("warning: Browser does not support creating object URLs. Built-in browser image decoding will not be available.");
          Module.noImageDecoding = true;
        }
  
        // Support for plugins that can process preloaded files. You can add more of these to
        // your app by creating and appending to Module.preloadPlugins.
        //
        // Each plugin is asked if it can handle a file based on the file's name. If it can,
        // it is given the file's raw data. When it is done, it calls a callback with the file's
        // (possibly modified) data. For example, a plugin might decompress a file, or it
        // might create some side data structure for use later (like an Image element, etc.).
  
        var imagePlugin = {};
        imagePlugin['canHandle'] = function imagePlugin_canHandle(name) {
          return !Module.noImageDecoding && /\.(jpg|jpeg|png|bmp)$/i.test(name);
        };
        imagePlugin['handle'] = function imagePlugin_handle(byteArray, name, onload, onerror) {
          var b = null;
          if (Browser.hasBlobConstructor) {
            try {
              b = new Blob([byteArray], { type: Browser.getMimetype(name) });
              if (b.size !== byteArray.length) { // Safari bug #118630
                // Safari's Blob can only take an ArrayBuffer
                b = new Blob([(new Uint8Array(byteArray)).buffer], { type: Browser.getMimetype(name) });
              }
            } catch(e) {
              warnOnce('Blob constructor present but fails: ' + e + '; falling back to blob builder');
            }
          }
          if (!b) {
            var bb = new Browser.BlobBuilder();
            bb.append((new Uint8Array(byteArray)).buffer); // we need to pass a buffer, and must copy the array to get the right data range
            b = bb.getBlob();
          }
          var url = Browser.URLObject.createObjectURL(b);
          assert(typeof url == 'string', 'createObjectURL must return a url as a string');
          var img = new Image();
          img.onload = () => {
            assert(img.complete, 'Image ' + name + ' could not be decoded');
            var canvas = /** @type {!HTMLCanvasElement} */ (document.createElement('canvas'));
            canvas.width = img.width;
            canvas.height = img.height;
            var ctx = canvas.getContext('2d');
            ctx.drawImage(img, 0, 0);
            preloadedImages[name] = canvas;
            Browser.URLObject.revokeObjectURL(url);
            if (onload) onload(byteArray);
          };
          img.onerror = (event) => {
            out('Image ' + url + ' could not be decoded');
            if (onerror) onerror();
          };
          img.src = url;
        };
        Module['preloadPlugins'].push(imagePlugin);
  
        var audioPlugin = {};
        audioPlugin['canHandle'] = function audioPlugin_canHandle(name) {
          return !Module.noAudioDecoding && name.substr(-4) in { '.ogg': 1, '.wav': 1, '.mp3': 1 };
        };
        audioPlugin['handle'] = function audioPlugin_handle(byteArray, name, onload, onerror) {
          var done = false;
          function finish(audio) {
            if (done) return;
            done = true;
            preloadedAudios[name] = audio;
            if (onload) onload(byteArray);
          }
          function fail() {
            if (done) return;
            done = true;
            preloadedAudios[name] = new Audio(); // empty shim
            if (onerror) onerror();
          }
          if (Browser.hasBlobConstructor) {
            try {
              var b = new Blob([byteArray], { type: Browser.getMimetype(name) });
            } catch(e) {
              return fail();
            }
            var url = Browser.URLObject.createObjectURL(b); // XXX we never revoke this!
            assert(typeof url == 'string', 'createObjectURL must return a url as a string');
            var audio = new Audio();
            audio.addEventListener('canplaythrough', () => finish(audio), false); // use addEventListener due to chromium bug 124926
            audio.onerror = function audio_onerror(event) {
              if (done) return;
              err('warning: browser could not fully decode audio ' + name + ', trying slower base64 approach');
              function encode64(data) {
                var BASE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
                var PAD = '=';
                var ret = '';
                var leftchar = 0;
                var leftbits = 0;
                for (var i = 0; i < data.length; i++) {
                  leftchar = (leftchar << 8) | data[i];
                  leftbits += 8;
                  while (leftbits >= 6) {
                    var curr = (leftchar >> (leftbits-6)) & 0x3f;
                    leftbits -= 6;
                    ret += BASE[curr];
                  }
                }
                if (leftbits == 2) {
                  ret += BASE[(leftchar&3) << 4];
                  ret += PAD + PAD;
                } else if (leftbits == 4) {
                  ret += BASE[(leftchar&0xf) << 2];
                  ret += PAD;
                }
                return ret;
              }
              audio.src = 'data:audio/x-' + name.substr(-3) + ';base64,' + encode64(byteArray);
              finish(audio); // we don't wait for confirmation this worked - but it's worth trying
            };
            audio.src = url;
            // workaround for chrome bug 124926 - we do not always get oncanplaythrough or onerror
            safeSetTimeout(function() {
              finish(audio); // try to use it even though it is not necessarily ready to play
            }, 10000);
          } else {
            return fail();
          }
        };
        Module['preloadPlugins'].push(audioPlugin);
  
        // Canvas event setup
  
        function pointerLockChange() {
          Browser.pointerLock = document['pointerLockElement'] === Module['canvas'] ||
                                document['mozPointerLockElement'] === Module['canvas'] ||
                                document['webkitPointerLockElement'] === Module['canvas'] ||
                                document['msPointerLockElement'] === Module['canvas'];
        }
        var canvas = Module['canvas'];
        if (canvas) {
          // forced aspect ratio can be enabled by defining 'forcedAspectRatio' on Module
          // Module['forcedAspectRatio'] = 4 / 3;
  
          canvas.requestPointerLock = canvas['requestPointerLock'] ||
                                      canvas['mozRequestPointerLock'] ||
                                      canvas['webkitRequestPointerLock'] ||
                                      canvas['msRequestPointerLock'] ||
                                      (() => {});
          canvas.exitPointerLock = document['exitPointerLock'] ||
                                   document['mozExitPointerLock'] ||
                                   document['webkitExitPointerLock'] ||
                                   document['msExitPointerLock'] ||
                                   (() => {}); // no-op if function does not exist
          canvas.exitPointerLock = canvas.exitPointerLock.bind(document);
  
          document.addEventListener('pointerlockchange', pointerLockChange, false);
          document.addEventListener('mozpointerlockchange', pointerLockChange, false);
          document.addEventListener('webkitpointerlockchange', pointerLockChange, false);
          document.addEventListener('mspointerlockchange', pointerLockChange, false);
  
          if (Module['elementPointerLock']) {
            canvas.addEventListener("click", (ev) => {
              if (!Browser.pointerLock && Module['canvas'].requestPointerLock) {
                Module['canvas'].requestPointerLock();
                ev.preventDefault();
              }
            }, false);
          }
        }
      },handledByPreloadPlugin:function(byteArray, fullname, finish, onerror) {
        // Ensure plugins are ready.
        Browser.init();
  
        var handled = false;
        Module['preloadPlugins'].forEach(function(plugin) {
          if (handled) return;
          if (plugin['canHandle'](fullname)) {
            plugin['handle'](byteArray, fullname, finish, onerror);
            handled = true;
          }
        });
        return handled;
      },createContext:function(/** @type {HTMLCanvasElement} */ canvas, useWebGL, setInModule, webGLContextAttributes) {
        if (useWebGL && Module.ctx && canvas == Module.canvas) return Module.ctx; // no need to recreate GL context if it's already been created for this canvas.
  
        var ctx;
        var contextHandle;
        if (useWebGL) {
          // For GLES2/desktop GL compatibility, adjust a few defaults to be different to WebGL defaults, so that they align better with the desktop defaults.
          var contextAttributes = {
            antialias: false,
            alpha: false,
            majorVersion: 2,
          };
  
          if (webGLContextAttributes) {
            for (var attribute in webGLContextAttributes) {
              contextAttributes[attribute] = webGLContextAttributes[attribute];
            }
          }
  
          // This check of existence of GL is here to satisfy Closure compiler, which yells if variable GL is referenced below but GL object is not
          // actually compiled in because application is not doing any GL operations. TODO: Ideally if GL is not being used, this function
          // Browser.createContext() should not even be emitted.
          if (typeof GL != 'undefined') {
            contextHandle = GL.createContext(canvas, contextAttributes);
            if (contextHandle) {
              ctx = GL.getContext(contextHandle).GLctx;
            }
          }
        } else {
          ctx = canvas.getContext('2d');
        }
  
        if (!ctx) return null;
  
        if (setInModule) {
          if (!useWebGL) assert(typeof GLctx == 'undefined', 'cannot set in module if GLctx is used, but we are a non-GL context that would replace it');
  
          Module.ctx = ctx;
          if (useWebGL) GL.makeContextCurrent(contextHandle);
          Module.useWebGL = useWebGL;
          Browser.moduleContextCreatedCallbacks.forEach(function(callback) { callback() });
          Browser.init();
        }
        return ctx;
      },destroyContext:function(canvas, useWebGL, setInModule) {},fullscreenHandlersInstalled:false,lockPointer:undefined,resizeCanvas:undefined,requestFullscreen:function(lockPointer, resizeCanvas) {
        Browser.lockPointer = lockPointer;
        Browser.resizeCanvas = resizeCanvas;
        if (typeof Browser.lockPointer == 'undefined') Browser.lockPointer = true;
        if (typeof Browser.resizeCanvas == 'undefined') Browser.resizeCanvas = false;
  
        var canvas = Module['canvas'];
        function fullscreenChange() {
          Browser.isFullscreen = false;
          var canvasContainer = canvas.parentNode;
          if ((document['fullscreenElement'] || document['mozFullScreenElement'] ||
               document['msFullscreenElement'] || document['webkitFullscreenElement'] ||
               document['webkitCurrentFullScreenElement']) === canvasContainer) {
            canvas.exitFullscreen = Browser.exitFullscreen;
            if (Browser.lockPointer) canvas.requestPointerLock();
            Browser.isFullscreen = true;
            if (Browser.resizeCanvas) {
              Browser.setFullscreenCanvasSize();
            } else {
              Browser.updateCanvasDimensions(canvas);
            }
          } else {
            // remove the full screen specific parent of the canvas again to restore the HTML structure from before going full screen
            canvasContainer.parentNode.insertBefore(canvas, canvasContainer);
            canvasContainer.parentNode.removeChild(canvasContainer);
  
            if (Browser.resizeCanvas) {
              Browser.setWindowedCanvasSize();
            } else {
              Browser.updateCanvasDimensions(canvas);
            }
          }
          if (Module['onFullScreen']) Module['onFullScreen'](Browser.isFullscreen);
          if (Module['onFullscreen']) Module['onFullscreen'](Browser.isFullscreen);
        }
  
        if (!Browser.fullscreenHandlersInstalled) {
          Browser.fullscreenHandlersInstalled = true;
          document.addEventListener('fullscreenchange', fullscreenChange, false);
          document.addEventListener('mozfullscreenchange', fullscreenChange, false);
          document.addEventListener('webkitfullscreenchange', fullscreenChange, false);
          document.addEventListener('MSFullscreenChange', fullscreenChange, false);
        }
  
        // create a new parent to ensure the canvas has no siblings. this allows browsers to optimize full screen performance when its parent is the full screen root
        var canvasContainer = document.createElement("div");
        canvas.parentNode.insertBefore(canvasContainer, canvas);
        canvasContainer.appendChild(canvas);
  
        // use parent of canvas as full screen root to allow aspect ratio correction (Firefox stretches the root to screen size)
        canvasContainer.requestFullscreen = canvasContainer['requestFullscreen'] ||
                                            canvasContainer['mozRequestFullScreen'] ||
                                            canvasContainer['msRequestFullscreen'] ||
                                           (canvasContainer['webkitRequestFullscreen'] ? () => canvasContainer['webkitRequestFullscreen'](Element['ALLOW_KEYBOARD_INPUT']) : null) ||
                                           (canvasContainer['webkitRequestFullScreen'] ? () => canvasContainer['webkitRequestFullScreen'](Element['ALLOW_KEYBOARD_INPUT']) : null);
  
        canvasContainer.requestFullscreen();
      },requestFullScreen:function() {
        abort('Module.requestFullScreen has been replaced by Module.requestFullscreen (without a capital S)');
      },exitFullscreen:function() {
        // This is workaround for chrome. Trying to exit from fullscreen
        // not in fullscreen state will cause "TypeError: Document not active"
        // in chrome. See https://github.com/emscripten-core/emscripten/pull/8236
        if (!Browser.isFullscreen) {
          return false;
        }
  
        var CFS = document['exitFullscreen'] ||
                  document['cancelFullScreen'] ||
                  document['mozCancelFullScreen'] ||
                  document['msExitFullscreen'] ||
                  document['webkitCancelFullScreen'] ||
            (function() {});
        CFS.apply(document, []);
        return true;
      },nextRAF:0,fakeRequestAnimationFrame:function(func) {
        // try to keep 60fps between calls to here
        var now = Date.now();
        if (Browser.nextRAF === 0) {
          Browser.nextRAF = now + 1000/60;
        } else {
          while (now + 2 >= Browser.nextRAF) { // fudge a little, to avoid timer jitter causing us to do lots of delay:0
            Browser.nextRAF += 1000/60;
          }
        }
        var delay = Math.max(Browser.nextRAF - now, 0);
        setTimeout(func, delay);
      },requestAnimationFrame:function(func) {
        if (typeof requestAnimationFrame == 'function') {
          requestAnimationFrame(func);
          return;
        }
        var RAF = Browser.fakeRequestAnimationFrame;
        RAF(func);
      },safeSetTimeout:function(func, timeout) {
        // Legacy function, this is used by the SDL2 port so we need to keep it
        // around at least until that is updated.
        // See https://github.com/libsdl-org/SDL/pull/6304
        return safeSetTimeout(func, timeout);
      },safeRequestAnimationFrame:function(func) {
        
        return Browser.requestAnimationFrame(function() {
          
          callUserCallback(func);
        });
      },getMimetype:function(name) {
        return {
          'jpg': 'image/jpeg',
          'jpeg': 'image/jpeg',
          'png': 'image/png',
          'bmp': 'image/bmp',
          'ogg': 'audio/ogg',
          'wav': 'audio/wav',
          'mp3': 'audio/mpeg'
        }[name.substr(name.lastIndexOf('.')+1)];
      },getUserMedia:function(func) {
        if (!window.getUserMedia) {
          window.getUserMedia = navigator['getUserMedia'] ||
                                navigator['mozGetUserMedia'];
        }
        window.getUserMedia(func);
      },getMovementX:function(event) {
        return event['movementX'] ||
               event['mozMovementX'] ||
               event['webkitMovementX'] ||
               0;
      },getMovementY:function(event) {
        return event['movementY'] ||
               event['mozMovementY'] ||
               event['webkitMovementY'] ||
               0;
      },getMouseWheelDelta:function(event) {
        var delta = 0;
        switch (event.type) {
          case 'DOMMouseScroll':
            // 3 lines make up a step
            delta = event.detail / 3;
            break;
          case 'mousewheel':
            // 120 units make up a step
            delta = event.wheelDelta / 120;
            break;
          case 'wheel':
            delta = event.deltaY
            switch (event.deltaMode) {
              case 0:
                // DOM_DELTA_PIXEL: 100 pixels make up a step
                delta /= 100;
                break;
              case 1:
                // DOM_DELTA_LINE: 3 lines make up a step
                delta /= 3;
                break;
              case 2:
                // DOM_DELTA_PAGE: A page makes up 80 steps
                delta *= 80;
                break;
              default:
                throw 'unrecognized mouse wheel delta mode: ' + event.deltaMode;
            }
            break;
          default:
            throw 'unrecognized mouse wheel event: ' + event.type;
        }
        return delta;
      },mouseX:0,mouseY:0,mouseMovementX:0,mouseMovementY:0,touches:{},lastTouches:{},calculateMouseEvent:function(event) { // event should be mousemove, mousedown or mouseup
        if (Browser.pointerLock) {
          // When the pointer is locked, calculate the coordinates
          // based on the movement of the mouse.
          // Workaround for Firefox bug 764498
          if (event.type != 'mousemove' &&
              ('mozMovementX' in event)) {
            Browser.mouseMovementX = Browser.mouseMovementY = 0;
          } else {
            Browser.mouseMovementX = Browser.getMovementX(event);
            Browser.mouseMovementY = Browser.getMovementY(event);
          }
  
          // check if SDL is available
          if (typeof SDL != "undefined") {
            Browser.mouseX = SDL.mouseX + Browser.mouseMovementX;
            Browser.mouseY = SDL.mouseY + Browser.mouseMovementY;
          } else {
            // just add the mouse delta to the current absolut mouse position
            // FIXME: ideally this should be clamped against the canvas size and zero
            Browser.mouseX += Browser.mouseMovementX;
            Browser.mouseY += Browser.mouseMovementY;
          }
        } else {
          // Otherwise, calculate the movement based on the changes
          // in the coordinates.
          var rect = Module["canvas"].getBoundingClientRect();
          var cw = Module["canvas"].width;
          var ch = Module["canvas"].height;
  
          // Neither .scrollX or .pageXOffset are defined in a spec, but
          // we prefer .scrollX because it is currently in a spec draft.
          // (see: http://www.w3.org/TR/2013/WD-cssom-view-20131217/)
          var scrollX = ((typeof window.scrollX != 'undefined') ? window.scrollX : window.pageXOffset);
          var scrollY = ((typeof window.scrollY != 'undefined') ? window.scrollY : window.pageYOffset);
          // If this assert lands, it's likely because the browser doesn't support scrollX or pageXOffset
          // and we have no viable fallback.
          assert((typeof scrollX != 'undefined') && (typeof scrollY != 'undefined'), 'Unable to retrieve scroll position, mouse positions likely broken.');
  
          if (event.type === 'touchstart' || event.type === 'touchend' || event.type === 'touchmove') {
            var touch = event.touch;
            if (touch === undefined) {
              return; // the "touch" property is only defined in SDL
  
            }
            var adjustedX = touch.pageX - (scrollX + rect.left);
            var adjustedY = touch.pageY - (scrollY + rect.top);
  
            adjustedX = adjustedX * (cw / rect.width);
            adjustedY = adjustedY * (ch / rect.height);
  
            var coords = { x: adjustedX, y: adjustedY };
  
            if (event.type === 'touchstart') {
              Browser.lastTouches[touch.identifier] = coords;
              Browser.touches[touch.identifier] = coords;
            } else if (event.type === 'touchend' || event.type === 'touchmove') {
              var last = Browser.touches[touch.identifier];
              if (!last) last = coords;
              Browser.lastTouches[touch.identifier] = last;
              Browser.touches[touch.identifier] = coords;
            }
            return;
          }
  
          var x = event.pageX - (scrollX + rect.left);
          var y = event.pageY - (scrollY + rect.top);
  
          // the canvas might be CSS-scaled compared to its backbuffer;
          // SDL-using content will want mouse coordinates in terms
          // of backbuffer units.
          x = x * (cw / rect.width);
          y = y * (ch / rect.height);
  
          Browser.mouseMovementX = x - Browser.mouseX;
          Browser.mouseMovementY = y - Browser.mouseY;
          Browser.mouseX = x;
          Browser.mouseY = y;
        }
      },resizeListeners:[],updateResizeListeners:function() {
        var canvas = Module['canvas'];
        Browser.resizeListeners.forEach(function(listener) {
          listener(canvas.width, canvas.height);
        });
      },setCanvasSize:function(width, height, noUpdates) {
        var canvas = Module['canvas'];
        Browser.updateCanvasDimensions(canvas, width, height);
        if (!noUpdates) Browser.updateResizeListeners();
      },windowedWidth:0,windowedHeight:0,setFullscreenCanvasSize:function() {
        // check if SDL is available
        if (typeof SDL != "undefined") {
          var flags = HEAPU32[((SDL.screen)>>2)];
          flags = flags | 0x00800000; // set SDL_FULLSCREEN flag
          HEAP32[((SDL.screen)>>2)] = flags;
        }
        Browser.updateCanvasDimensions(Module['canvas']);
        Browser.updateResizeListeners();
      },setWindowedCanvasSize:function() {
        // check if SDL is available
        if (typeof SDL != "undefined") {
          var flags = HEAPU32[((SDL.screen)>>2)];
          flags = flags & ~0x00800000; // clear SDL_FULLSCREEN flag
          HEAP32[((SDL.screen)>>2)] = flags;
        }
        Browser.updateCanvasDimensions(Module['canvas']);
        Browser.updateResizeListeners();
      },updateCanvasDimensions:function(canvas, wNative, hNative) {
        if (wNative && hNative) {
          canvas.widthNative = wNative;
          canvas.heightNative = hNative;
        } else {
          wNative = canvas.widthNative;
          hNative = canvas.heightNative;
        }
        var w = wNative;
        var h = hNative;
        if (Module['forcedAspectRatio'] && Module['forcedAspectRatio'] > 0) {
          if (w/h < Module['forcedAspectRatio']) {
            w = Math.round(h * Module['forcedAspectRatio']);
          } else {
            h = Math.round(w / Module['forcedAspectRatio']);
          }
        }
        if (((document['fullscreenElement'] || document['mozFullScreenElement'] ||
             document['msFullscreenElement'] || document['webkitFullscreenElement'] ||
             document['webkitCurrentFullScreenElement']) === canvas.parentNode) && (typeof screen != 'undefined')) {
           var factor = Math.min(screen.width / w, screen.height / h);
           w = Math.round(w * factor);
           h = Math.round(h * factor);
        }
        if (Browser.resizeCanvas) {
          if (canvas.width  != w) canvas.width  = w;
          if (canvas.height != h) canvas.height = h;
          if (typeof canvas.style != 'undefined') {
            canvas.style.removeProperty( "width");
            canvas.style.removeProperty("height");
          }
        } else {
          if (canvas.width  != wNative) canvas.width  = wNative;
          if (canvas.height != hNative) canvas.height = hNative;
          if (typeof canvas.style != 'undefined') {
            if (w != wNative || h != hNative) {
              canvas.style.setProperty( "width", w + "px", "important");
              canvas.style.setProperty("height", h + "px", "important");
            } else {
              canvas.style.removeProperty( "width");
              canvas.style.removeProperty("height");
            }
          }
        }
      }};
  
  var EGL = {errorCode:12288,defaultDisplayInitialized:false,currentContext:0,currentReadSurface:0,currentDrawSurface:0,contextAttributes:{alpha:false,depth:false,stencil:false,antialias:false},stringCache:{},setErrorCode:function(code) {
        EGL.errorCode = code;
      },chooseConfig:function(display, attribList, config, config_size, numConfigs) {
        if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
          EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
          return 0;
        }
  
        if (attribList) {
          // read attribList if it is non-null
          for (;;) {
            var param = HEAP32[((attribList)>>2)];
            if (param == 0x3021 /*EGL_ALPHA_SIZE*/) {
              var alphaSize = HEAP32[(((attribList)+(4))>>2)];
              EGL.contextAttributes.alpha = (alphaSize > 0);
            } else if (param == 0x3025 /*EGL_DEPTH_SIZE*/) {
              var depthSize = HEAP32[(((attribList)+(4))>>2)];
              EGL.contextAttributes.depth = (depthSize > 0);
            } else if (param == 0x3026 /*EGL_STENCIL_SIZE*/) {
              var stencilSize = HEAP32[(((attribList)+(4))>>2)];
              EGL.contextAttributes.stencil = (stencilSize > 0);
            } else if (param == 0x3031 /*EGL_SAMPLES*/) {
              var samples = HEAP32[(((attribList)+(4))>>2)];
              EGL.contextAttributes.antialias = (samples > 0);
            } else if (param == 0x3032 /*EGL_SAMPLE_BUFFERS*/) {
              var samples = HEAP32[(((attribList)+(4))>>2)];
              EGL.contextAttributes.antialias = (samples == 1);
            } else if (param == 0x3100 /*EGL_CONTEXT_PRIORITY_LEVEL_IMG*/) {
              var requestedPriority = HEAP32[(((attribList)+(4))>>2)];
              EGL.contextAttributes.lowLatency = (requestedPriority != 0x3103 /*EGL_CONTEXT_PRIORITY_LOW_IMG*/);
            } else if (param == 0x3038 /*EGL_NONE*/) {
                break;
            }
            attribList += 8;
          }
        }
  
        if ((!config || !config_size) && !numConfigs) {
          EGL.setErrorCode(0x300C /* EGL_BAD_PARAMETER */);
          return 0;
        }
        if (numConfigs) {
          HEAP32[((numConfigs)>>2)] = 1; // Total number of supported configs: 1.
        }
        if (config && config_size > 0) {
          HEAP32[((config)>>2)] = 62002;
        }
  
        EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
        return 1;
      }};
  function _eglBindAPI(api) {
      if (api == 0x30A0 /* EGL_OPENGL_ES_API */) {
        EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
        return 1;
      }
      // if (api == 0x30A1 /* EGL_OPENVG_API */ || api == 0x30A2 /* EGL_OPENGL_API */) {
      EGL.setErrorCode(0x300C /* EGL_BAD_PARAMETER */);
      return 0;
    }

  function _eglChooseConfig(display, attrib_list, configs, config_size, numConfigs) {
      return EGL.chooseConfig(display, attrib_list, configs, config_size, numConfigs);
    }

  function __webgl_enable_WEBGL_draw_instanced_base_vertex_base_instance(ctx) {
      // Closure is expected to be allowed to minify the '.dibvbi' property, so not accessing it quoted.
      return !!(ctx.dibvbi = ctx.getExtension('WEBGL_draw_instanced_base_vertex_base_instance'));
    }
  
  function __webgl_enable_WEBGL_multi_draw_instanced_base_vertex_base_instance(ctx) {
      // Closure is expected to be allowed to minify the '.mdibvbi' property, so not accessing it quoted.
      return !!(ctx.mdibvbi = ctx.getExtension('WEBGL_multi_draw_instanced_base_vertex_base_instance'));
    }
  
  function __webgl_enable_WEBGL_multi_draw(ctx) {
      // Closure is expected to be allowed to minify the '.multiDrawWebgl' property, so not accessing it quoted.
      return !!(ctx.multiDrawWebgl = ctx.getExtension('WEBGL_multi_draw'));
    }
  
  var GL = {counter:1,buffers:[],mappedBuffers:{},programs:[],framebuffers:[],renderbuffers:[],textures:[],shaders:[],vaos:[],contexts:[],offscreenCanvases:{},queries:[],samplers:[],transformFeedbacks:[],syncs:[],byteSizeByTypeRoot:5120,byteSizeByType:[1,1,2,2,4,4,4,2,3,4,8],stringCache:{},stringiCache:{},unpackAlignment:4,recordError:function recordError(errorCode) {
        if (!GL.lastError) {
          GL.lastError = errorCode;
        }
      },getNewId:function(table) {
        var ret = GL.counter++;
        for (var i = table.length; i < ret; i++) {
          table[i] = null;
        }
        return ret;
      },MAX_TEMP_BUFFER_SIZE:2097152,numTempVertexBuffersPerSize:64,log2ceilLookup:function(i) {
        return 32 - Math.clz32(i === 0 ? 0 : i - 1);
      },generateTempBuffers:function(quads, context) {
        var largestIndex = GL.log2ceilLookup(GL.MAX_TEMP_BUFFER_SIZE);
        context.tempVertexBufferCounters1 = [];
        context.tempVertexBufferCounters2 = [];
        context.tempVertexBufferCounters1.length = context.tempVertexBufferCounters2.length = largestIndex+1;
        context.tempVertexBuffers1 = [];
        context.tempVertexBuffers2 = [];
        context.tempVertexBuffers1.length = context.tempVertexBuffers2.length = largestIndex+1;
        context.tempIndexBuffers = [];
        context.tempIndexBuffers.length = largestIndex+1;
        for (var i = 0; i <= largestIndex; ++i) {
          context.tempIndexBuffers[i] = null; // Created on-demand
          context.tempVertexBufferCounters1[i] = context.tempVertexBufferCounters2[i] = 0;
          var ringbufferLength = GL.numTempVertexBuffersPerSize;
          context.tempVertexBuffers1[i] = [];
          context.tempVertexBuffers2[i] = [];
          var ringbuffer1 = context.tempVertexBuffers1[i];
          var ringbuffer2 = context.tempVertexBuffers2[i];
          ringbuffer1.length = ringbuffer2.length = ringbufferLength;
          for (var j = 0; j < ringbufferLength; ++j) {
            ringbuffer1[j] = ringbuffer2[j] = null; // Created on-demand
          }
        }
  
        if (quads) {
          // GL_QUAD indexes can be precalculated
          context.tempQuadIndexBuffer = GLctx.createBuffer();
          context.GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, context.tempQuadIndexBuffer);
          var numIndexes = GL.MAX_TEMP_BUFFER_SIZE >> 1;
          var quadIndexes = new Uint16Array(numIndexes);
          var i = 0, v = 0;
          while (1) {
            quadIndexes[i++] = v;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v+1;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v+2;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v+2;
            if (i >= numIndexes) break;
            quadIndexes[i++] = v+3;
            if (i >= numIndexes) break;
            v += 4;
          }
          context.GLctx.bufferData(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, quadIndexes, 0x88E4 /*GL_STATIC_DRAW*/);
          context.GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, null);
        }
      },getTempVertexBuffer:function getTempVertexBuffer(sizeBytes) {
        var idx = GL.log2ceilLookup(sizeBytes);
        var ringbuffer = GL.currentContext.tempVertexBuffers1[idx];
        var nextFreeBufferIndex = GL.currentContext.tempVertexBufferCounters1[idx];
        GL.currentContext.tempVertexBufferCounters1[idx] = (GL.currentContext.tempVertexBufferCounters1[idx]+1) & (GL.numTempVertexBuffersPerSize-1);
        var vbo = ringbuffer[nextFreeBufferIndex];
        if (vbo) {
          return vbo;
        }
        var prevVBO = GLctx.getParameter(0x8894 /*GL_ARRAY_BUFFER_BINDING*/);
        ringbuffer[nextFreeBufferIndex] = GLctx.createBuffer();
        GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, ringbuffer[nextFreeBufferIndex]);
        GLctx.bufferData(0x8892 /*GL_ARRAY_BUFFER*/, 1 << idx, 0x88E8 /*GL_DYNAMIC_DRAW*/);
        GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, prevVBO);
        return ringbuffer[nextFreeBufferIndex];
      },getTempIndexBuffer:function getTempIndexBuffer(sizeBytes) {
        var idx = GL.log2ceilLookup(sizeBytes);
        var ibo = GL.currentContext.tempIndexBuffers[idx];
        if (ibo) {
          return ibo;
        }
        var prevIBO = GLctx.getParameter(0x8895 /*ELEMENT_ARRAY_BUFFER_BINDING*/);
        GL.currentContext.tempIndexBuffers[idx] = GLctx.createBuffer();
        GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, GL.currentContext.tempIndexBuffers[idx]);
        GLctx.bufferData(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, 1 << idx, 0x88E8 /*GL_DYNAMIC_DRAW*/);
        GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, prevIBO);
        return GL.currentContext.tempIndexBuffers[idx];
      },newRenderingFrameStarted:function newRenderingFrameStarted() {
        if (!GL.currentContext) {
          return;
        }
        var vb = GL.currentContext.tempVertexBuffers1;
        GL.currentContext.tempVertexBuffers1 = GL.currentContext.tempVertexBuffers2;
        GL.currentContext.tempVertexBuffers2 = vb;
        vb = GL.currentContext.tempVertexBufferCounters1;
        GL.currentContext.tempVertexBufferCounters1 = GL.currentContext.tempVertexBufferCounters2;
        GL.currentContext.tempVertexBufferCounters2 = vb;
        var largestIndex = GL.log2ceilLookup(GL.MAX_TEMP_BUFFER_SIZE);
        for (var i = 0; i <= largestIndex; ++i) {
          GL.currentContext.tempVertexBufferCounters1[i] = 0;
        }
      },getSource:function(shader, count, string, length) {
        var source = '';
        for (var i = 0; i < count; ++i) {
          var len = length ? HEAP32[(((length)+(i*4))>>2)] : -1;
          source += UTF8ToString(HEAP32[(((string)+(i*4))>>2)], len < 0 ? undefined : len);
        }
        return source;
      },calcBufLength:function calcBufLength(size, type, stride, count) {
        if (stride > 0) {
          return count * stride;  // XXXvlad this is not exactly correct I don't think
        }
        var typeSize = GL.byteSizeByType[type - GL.byteSizeByTypeRoot];
        return size * typeSize * count;
      },usedTempBuffers:[],preDrawHandleClientVertexAttribBindings:function preDrawHandleClientVertexAttribBindings(count) {
        GL.resetBufferBinding = false;
  
        // TODO: initial pass to detect ranges we need to upload, might not need an upload per attrib
        for (var i = 0; i < GL.currentContext.maxVertexAttribs; ++i) {
          var cb = GL.currentContext.clientBuffers[i];
          if (!cb.clientside || !cb.enabled) continue;
  
          GL.resetBufferBinding = true;
  
          var size = GL.calcBufLength(cb.size, cb.type, cb.stride, count);
          var buf = GL.getTempVertexBuffer(size);
          GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, buf);
          GLctx.bufferSubData(0x8892 /*GL_ARRAY_BUFFER*/,
                                   0,
                                   HEAPU8.subarray(cb.ptr, cb.ptr + size));
          cb.vertexAttribPointerAdaptor.call(GLctx, i, cb.size, cb.type, cb.normalized, cb.stride, 0);
        }
      },postDrawHandleClientVertexAttribBindings:function postDrawHandleClientVertexAttribBindings() {
        if (GL.resetBufferBinding) {
          GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, GL.buffers[GLctx.currentArrayBufferBinding]);
        }
      },createContext:function(/** @type {HTMLCanvasElement} */ canvas, webGLContextAttributes) {
  
        // BUG: Workaround Safari WebGL issue: After successfully acquiring WebGL context on a canvas,
        // calling .getContext() will always return that context independent of which 'webgl' or 'webgl2'
        // context version was passed. See https://bugs.webkit.org/show_bug.cgi?id=222758 and
        // https://github.com/emscripten-core/emscripten/issues/13295.
        // TODO: Once the bug is fixed and shipped in Safari, adjust the Safari version field in above check.
        if (!canvas.getContextSafariWebGL2Fixed) {
          canvas.getContextSafariWebGL2Fixed = canvas.getContext;
          /** @type {function(this:HTMLCanvasElement, string, (Object|null)=): (Object|null)} */
          function fixedGetContext(ver, attrs) {
            var gl = canvas.getContextSafariWebGL2Fixed(ver, attrs);
            return ((ver == 'webgl') == (gl instanceof WebGLRenderingContext)) ? gl : null;
          }
          canvas.getContext = fixedGetContext;
        }
  
        var ctx = canvas.getContext("webgl2", webGLContextAttributes);
  
        if (!ctx) return 0;
  
        var handle = GL.registerContext(ctx, webGLContextAttributes);
  
        return handle;
      },registerContext:function(ctx, webGLContextAttributes) {
        // without pthreads a context is just an integer ID
        var handle = GL.getNewId(GL.contexts);
  
        var context = {
          handle: handle,
          attributes: webGLContextAttributes,
          version: webGLContextAttributes.majorVersion,
          GLctx: ctx
        };
  
        // Store the created context object so that we can access the context given a canvas without having to pass the parameters again.
        if (ctx.canvas) ctx.canvas.GLctxObject = context;
        GL.contexts[handle] = context;
        if (typeof webGLContextAttributes.enableExtensionsByDefault == 'undefined' || webGLContextAttributes.enableExtensionsByDefault) {
          GL.initExtensions(context);
        }
  
        context.maxVertexAttribs = context.GLctx.getParameter(0x8869 /*GL_MAX_VERTEX_ATTRIBS*/);
        context.clientBuffers = [];
        for (var i = 0; i < context.maxVertexAttribs; i++) {
          context.clientBuffers[i] = { enabled: false, clientside: false, size: 0, type: 0, normalized: 0, stride: 0, ptr: 0, vertexAttribPointerAdaptor: null };
        }
  
        GL.generateTempBuffers(false, context);
  
        return handle;
      },makeContextCurrent:function(contextHandle) {
  
        GL.currentContext = GL.contexts[contextHandle]; // Active Emscripten GL layer context object.
        Module.ctx = GLctx = GL.currentContext && GL.currentContext.GLctx; // Active WebGL context object.
        return !(contextHandle && !GLctx);
      },getContext:function(contextHandle) {
        return GL.contexts[contextHandle];
      },deleteContext:function(contextHandle) {
        if (GL.currentContext === GL.contexts[contextHandle]) GL.currentContext = null;
        if (typeof JSEvents == 'object') JSEvents.removeAllHandlersOnTarget(GL.contexts[contextHandle].GLctx.canvas); // Release all JS event handlers on the DOM element that the GL context is associated with since the context is now deleted.
        if (GL.contexts[contextHandle] && GL.contexts[contextHandle].GLctx.canvas) GL.contexts[contextHandle].GLctx.canvas.GLctxObject = undefined; // Make sure the canvas object no longer refers to the context object so there are no GC surprises.
        GL.contexts[contextHandle] = null;
      },initExtensions:function(context) {
        // If this function is called without a specific context object, init the extensions of the currently active context.
        if (!context) context = GL.currentContext;
  
        if (context.initExtensionsDone) return;
        context.initExtensionsDone = true;
  
        var GLctx = context.GLctx;
  
        // Detect the presence of a few extensions manually, this GL interop layer itself will need to know if they exist.
  
        // Extensions that are available from WebGL >= 2 (no-op if called on a WebGL 1 context active)
        __webgl_enable_WEBGL_draw_instanced_base_vertex_base_instance(GLctx);
        __webgl_enable_WEBGL_multi_draw_instanced_base_vertex_base_instance(GLctx);
  
        // On WebGL 2, EXT_disjoint_timer_query is replaced with an alternative
        // that's based on core APIs, and exposes only the queryCounterEXT()
        // entrypoint.
        if (context.version >= 2) {
          GLctx.disjointTimerQueryExt = GLctx.getExtension("EXT_disjoint_timer_query_webgl2");
        }
  
        // However, Firefox exposes the WebGL 1 version on WebGL 2 as well and
        // thus we look for the WebGL 1 version again if the WebGL 2 version
        // isn't present. https://bugzilla.mozilla.org/show_bug.cgi?id=1328882
        if (context.version < 2 || !GLctx.disjointTimerQueryExt)
        {
          GLctx.disjointTimerQueryExt = GLctx.getExtension("EXT_disjoint_timer_query");
        }
  
        __webgl_enable_WEBGL_multi_draw(GLctx);
  
        // .getSupportedExtensions() can return null if context is lost, so coerce to empty array.
        var exts = GLctx.getSupportedExtensions() || [];
        exts.forEach(function(ext) {
          // WEBGL_lose_context, WEBGL_debug_renderer_info and WEBGL_debug_shaders are not enabled by default.
          if (!ext.includes('lose_context') && !ext.includes('debug')) {
            // Call .getExtension() to enable that extension permanently.
            GLctx.getExtension(ext);
          }
        });
      }};
  
  function _eglCreateContext(display, config, hmm, contextAttribs) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0;
      }
  
      // EGL 1.4 spec says default EGL_CONTEXT_CLIENT_VERSION is GLES1, but this is not supported by Emscripten.
      // So user must pass EGL_CONTEXT_CLIENT_VERSION == 2 to initialize EGL.
      var glesContextVersion = 1;
      for (;;) {
        var param = HEAP32[((contextAttribs)>>2)];
        if (param == 0x3098 /*EGL_CONTEXT_CLIENT_VERSION*/) {
          glesContextVersion = HEAP32[(((contextAttribs)+(4))>>2)];
        } else if (param == 0x3038 /*EGL_NONE*/) {
          break;
        } else {
          /* EGL1.4 specifies only EGL_CONTEXT_CLIENT_VERSION as supported attribute */
          EGL.setErrorCode(0x3004 /*EGL_BAD_ATTRIBUTE*/);
          return 0;
        }
        contextAttribs += 8;
      }
      if (glesContextVersion < 2 || glesContextVersion > 3) {
        EGL.setErrorCode(0x3005 /* EGL_BAD_CONFIG */);
        return 0; /* EGL_NO_CONTEXT */
      }
  
      EGL.contextAttributes.majorVersion = glesContextVersion - 1; // WebGL 1 is GLES 2, WebGL2 is GLES3
      EGL.contextAttributes.minorVersion = 0;
  
      EGL.context = GL.createContext(Module['canvas'], EGL.contextAttributes);
  
      if (EGL.context != 0) {
        EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
  
        // Run callbacks so that GL emulation works
        GL.makeContextCurrent(EGL.context);
        Module.useWebGL = true;
        Browser.moduleContextCreatedCallbacks.forEach(function(callback) { callback() });
  
        // Note: This function only creates a context, but it shall not make it active.
        GL.makeContextCurrent(null);
        return 62004; // Magic ID for Emscripten EGLContext
      } else {
        EGL.setErrorCode(0x3009 /* EGL_BAD_MATCH */); // By the EGL 1.4 spec, an implementation that does not support GLES2 (WebGL in this case), this error code is set.
        return 0; /* EGL_NO_CONTEXT */
      }
    }

  function _eglCreateWindowSurface(display, config, win, attrib_list) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0;
      }
      if (config != 62002 /* Magic ID for the only EGLConfig supported by Emscripten */) {
        EGL.setErrorCode(0x3005 /* EGL_BAD_CONFIG */);
        return 0;
      }
      // TODO: Examine attrib_list! Parameters that can be present there are:
      // - EGL_RENDER_BUFFER (must be EGL_BACK_BUFFER)
      // - EGL_VG_COLORSPACE (can't be set)
      // - EGL_VG_ALPHA_FORMAT (can't be set)
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      return 62006; /* Magic ID for Emscripten 'default surface' */
    }

  
  function _eglDestroyContext(display, context) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0;
      }
      if (context != 62004 /* Magic ID for Emscripten EGLContext */) {
        EGL.setErrorCode(0x3006 /* EGL_BAD_CONTEXT */);
        return 0;
      }
  
      GL.deleteContext(EGL.context);
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      if (EGL.currentContext == context) {
        EGL.currentContext = 0;
      }
      return 1 /* EGL_TRUE */;
    }

  function _eglDestroySurface(display, surface) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0;
      }
      if (surface != 62006 /* Magic ID for the only EGLSurface supported by Emscripten */) {
        EGL.setErrorCode(0x300D /* EGL_BAD_SURFACE */);
        return 1;
      }
      if (EGL.currentReadSurface == surface) {
        EGL.currentReadSurface = 0;
      }
      if (EGL.currentDrawSurface == surface) {
        EGL.currentDrawSurface = 0;
      }
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      return 1; /* Magic ID for Emscripten 'default surface' */
    }

  function _eglGetConfigAttrib(display, config, attribute, value) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0;
      }
      if (config != 62002 /* Magic ID for the only EGLConfig supported by Emscripten */) {
        EGL.setErrorCode(0x3005 /* EGL_BAD_CONFIG */);
        return 0;
      }
      if (!value) {
        EGL.setErrorCode(0x300C /* EGL_BAD_PARAMETER */);
        return 0;
      }
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      switch (attribute) {
      case 0x3020: // EGL_BUFFER_SIZE
        HEAP32[((value)>>2)] = EGL.contextAttributes.alpha ? 32 : 24;
        return 1;
      case 0x3021: // EGL_ALPHA_SIZE
        HEAP32[((value)>>2)] = EGL.contextAttributes.alpha ? 8 : 0;
        return 1;
      case 0x3022: // EGL_BLUE_SIZE
        HEAP32[((value)>>2)] = 8;
        return 1;
      case 0x3023: // EGL_GREEN_SIZE
        HEAP32[((value)>>2)] = 8;
        return 1;
      case 0x3024: // EGL_RED_SIZE
        HEAP32[((value)>>2)] = 8;
        return 1;
      case 0x3025: // EGL_DEPTH_SIZE
        HEAP32[((value)>>2)] = EGL.contextAttributes.depth ? 24 : 0;
        return 1;
      case 0x3026: // EGL_STENCIL_SIZE
        HEAP32[((value)>>2)] = EGL.contextAttributes.stencil ? 8 : 0;
        return 1;
      case 0x3027: // EGL_CONFIG_CAVEAT
        // We can return here one of EGL_NONE (0x3038), EGL_SLOW_CONFIG (0x3050) or EGL_NON_CONFORMANT_CONFIG (0x3051).
        HEAP32[((value)>>2)] = 0x3038;
        return 1;
      case 0x3028: // EGL_CONFIG_ID
        HEAP32[((value)>>2)] = 62002;
        return 1;
      case 0x3029: // EGL_LEVEL
        HEAP32[((value)>>2)] = 0;
        return 1;
      case 0x302A: // EGL_MAX_PBUFFER_HEIGHT
        HEAP32[((value)>>2)] = 4096;
        return 1;
      case 0x302B: // EGL_MAX_PBUFFER_PIXELS
        HEAP32[((value)>>2)] = 16777216;
        return 1;
      case 0x302C: // EGL_MAX_PBUFFER_WIDTH
        HEAP32[((value)>>2)] = 4096;
        return 1;
      case 0x302D: // EGL_NATIVE_RENDERABLE
        HEAP32[((value)>>2)] = 0;
        return 1;
      case 0x302E: // EGL_NATIVE_VISUAL_ID
        HEAP32[((value)>>2)] = 0;
        return 1;
      case 0x302F: // EGL_NATIVE_VISUAL_TYPE
        HEAP32[((value)>>2)] = 0x3038;
        return 1;
      case 0x3031: // EGL_SAMPLES
        HEAP32[((value)>>2)] = EGL.contextAttributes.antialias ? 4 : 0;
        return 1;
      case 0x3032: // EGL_SAMPLE_BUFFERS
        HEAP32[((value)>>2)] = EGL.contextAttributes.antialias ? 1 : 0;
        return 1;
      case 0x3033: // EGL_SURFACE_TYPE
        HEAP32[((value)>>2)] = 0x4;
        return 1;
      case 0x3034: // EGL_TRANSPARENT_TYPE
        // If this returns EGL_TRANSPARENT_RGB (0x3052), transparency is used through color-keying. No such thing applies to Emscripten canvas.
        HEAP32[((value)>>2)] = 0x3038;
        return 1;
      case 0x3035: // EGL_TRANSPARENT_BLUE_VALUE
      case 0x3036: // EGL_TRANSPARENT_GREEN_VALUE
      case 0x3037: // EGL_TRANSPARENT_RED_VALUE
        // "If EGL_TRANSPARENT_TYPE is EGL_NONE, then the values for EGL_TRANSPARENT_RED_VALUE, EGL_TRANSPARENT_GREEN_VALUE, and EGL_TRANSPARENT_BLUE_VALUE are undefined."
        HEAP32[((value)>>2)] = -1;
        return 1;
      case 0x3039: // EGL_BIND_TO_TEXTURE_RGB
      case 0x303A: // EGL_BIND_TO_TEXTURE_RGBA
        HEAP32[((value)>>2)] = 0;
        return 1;
      case 0x303B: // EGL_MIN_SWAP_INTERVAL
        HEAP32[((value)>>2)] = 0;
        return 1;
      case 0x303C: // EGL_MAX_SWAP_INTERVAL
        HEAP32[((value)>>2)] = 1;
        return 1;
      case 0x303D: // EGL_LUMINANCE_SIZE
      case 0x303E: // EGL_ALPHA_MASK_SIZE
        HEAP32[((value)>>2)] = 0;
        return 1;
      case 0x303F: // EGL_COLOR_BUFFER_TYPE
        // EGL has two types of buffers: EGL_RGB_BUFFER and EGL_LUMINANCE_BUFFER.
        HEAP32[((value)>>2)] = 0x308E;
        return 1;
      case 0x3040: // EGL_RENDERABLE_TYPE
        // A bit combination of EGL_OPENGL_ES_BIT,EGL_OPENVG_BIT,EGL_OPENGL_ES2_BIT and EGL_OPENGL_BIT.
        HEAP32[((value)>>2)] = 0x4;
        return 1;
      case 0x3042: // EGL_CONFORMANT
        // "EGL_CONFORMANT is a mask indicating if a client API context created with respect to the corresponding EGLConfig will pass the required conformance tests for that API."
        HEAP32[((value)>>2)] = 0;
        return 1;
      default:
        EGL.setErrorCode(0x3004 /* EGL_BAD_ATTRIBUTE */);
        return 0;
      }
    }

  function _eglGetDisplay(nativeDisplayType) {
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      // Note: As a 'conformant' implementation of EGL, we would prefer to init here only if the user
      //       calls this function with EGL_DEFAULT_DISPLAY. Other display IDs would be preferred to be unsupported
      //       and EGL_NO_DISPLAY returned. Uncomment the following code lines to do this.
      // Instead, an alternative route has been preferred, namely that the Emscripten EGL implementation
      // "emulates" X11, and eglGetDisplay is expected to accept/receive a pointer to an X11 Display object.
      // Therefore, be lax and allow anything to be passed in, and return the magic handle to our default EGLDisplay object.
  
  //    if (nativeDisplayType == 0 /* EGL_DEFAULT_DISPLAY */) {
          return 62000; // Magic ID for Emscripten 'default display'
  //    }
  //    else
  //      return 0; // EGL_NO_DISPLAY
    }

  function _eglGetError() {
      return EGL.errorCode;
    }

  function _eglInitialize(display, majorVersion, minorVersion) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0;
      }
      if (majorVersion) {
        HEAP32[((majorVersion)>>2)] = 1; // Advertise EGL Major version: '1'
      }
      if (minorVersion) {
        HEAP32[((minorVersion)>>2)] = 4; // Advertise EGL Minor version: '4'
      }
      EGL.defaultDisplayInitialized = true;
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      return 1;
    }

  
  function _eglMakeCurrent(display, draw, read, context) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0 /* EGL_FALSE */;
      }
      //\todo An EGL_NOT_INITIALIZED error is generated if EGL is not initialized for dpy.
      if (context != 0 && context != 62004 /* Magic ID for Emscripten EGLContext */) {
        EGL.setErrorCode(0x3006 /* EGL_BAD_CONTEXT */);
        return 0;
      }
      if ((read != 0 && read != 62006) || (draw != 0 && draw != 62006 /* Magic ID for Emscripten 'default surface' */)) {
        EGL.setErrorCode(0x300D /* EGL_BAD_SURFACE */);
        return 0;
      }
  
      GL.makeContextCurrent(context ? EGL.context : null);
  
      EGL.currentContext = context;
      EGL.currentDrawSurface = draw;
      EGL.currentReadSurface = read;
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      return 1 /* EGL_TRUE */;
    }

  function allocateUTF8(str) {
      var size = lengthBytesUTF8(str) + 1;
      var ret = _malloc(size);
      if (ret) stringToUTF8Array(str, HEAP8, ret, size);
      return ret;
    }
  
  function _eglQueryString(display, name) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0;
      }
      //\todo An EGL_NOT_INITIALIZED error is generated if EGL is not initialized for dpy.
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      if (EGL.stringCache[name]) return EGL.stringCache[name];
      var ret;
      switch (name) {
        case 0x3053 /* EGL_VENDOR */: ret = allocateUTF8("Emscripten"); break;
        case 0x3054 /* EGL_VERSION */: ret = allocateUTF8("1.4 Emscripten EGL"); break;
        case 0x3055 /* EGL_EXTENSIONS */:  ret = allocateUTF8(""); break; // Currently not supporting any EGL extensions.
        case 0x308D /* EGL_CLIENT_APIS */: ret = allocateUTF8("OpenGL_ES"); break;
        default:
          EGL.setErrorCode(0x300C /* EGL_BAD_PARAMETER */);
          return 0;
      }
      EGL.stringCache[name] = ret;
      return ret;
    }

  function _eglSwapBuffers() {
  
      if (!EGL.defaultDisplayInitialized) {
        EGL.setErrorCode(0x3001 /* EGL_NOT_INITIALIZED */);
      } else if (!Module.ctx) {
        EGL.setErrorCode(0x3002 /* EGL_BAD_ACCESS */);
      } else if (Module.ctx.isContextLost()) {
        EGL.setErrorCode(0x300E /* EGL_CONTEXT_LOST */);
      } else {
        // According to documentation this does an implicit flush.
        // Due to discussion at https://github.com/emscripten-core/emscripten/pull/1871
        // the flush was removed since this _may_ result in slowing code down.
        //_glFlush();
        EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
        return 1 /* EGL_TRUE */;
      }
      return 0 /* EGL_FALSE */;
    }

  
  function _eglSwapInterval(display, interval) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0;
      }
      if (interval == 0) _emscripten_set_main_loop_timing(0/*EM_TIMING_SETTIMEOUT*/, 0);
      else _emscripten_set_main_loop_timing(1/*EM_TIMING_RAF*/, interval);
  
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      return 1;
    }

  function _eglTerminate(display) {
      if (display != 62000 /* Magic ID for Emscripten 'default display' */) {
        EGL.setErrorCode(0x3008 /* EGL_BAD_DISPLAY */);
        return 0;
      }
      EGL.currentContext = 0;
      EGL.currentReadSurface = 0;
      EGL.currentDrawSurface = 0;
      EGL.defaultDisplayInitialized = false;
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      return 1;
    }

  
  function _eglWaitClient() {
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      return 1;
    }
  var _eglWaitGL = _eglWaitClient;

  function _eglWaitNative(nativeEngineId) {
      EGL.setErrorCode(0x3000 /* EGL_SUCCESS */);
      return 1;
    }

  var readEmAsmArgsArray = [];
  function readEmAsmArgs(sigPtr, buf) {
      // Nobody should have mutated _readEmAsmArgsArray underneath us to be something else than an array.
      assert(Array.isArray(readEmAsmArgsArray));
      // The input buffer is allocated on the stack, so it must be stack-aligned.
      assert(buf % 16 == 0);
      readEmAsmArgsArray.length = 0;
      var ch;
      // Most arguments are i32s, so shift the buffer pointer so it is a plain
      // index into HEAP32.
      buf >>= 2;
      while (ch = HEAPU8[sigPtr++]) {
        var chr = String.fromCharCode(ch);
        var validChars = ['d', 'f', 'i'];
        assert(validChars.includes(chr), 'Invalid character ' + ch + '("' + chr + '") in readEmAsmArgs! Use only [' + validChars + '], and do not specify "v" for void return argument.');
        // Floats are always passed as doubles, and doubles and int64s take up 8
        // bytes (two 32-bit slots) in memory, align reads to these:
        buf += (ch != 105/*i*/) & buf;
        readEmAsmArgsArray.push(
          ch == 105/*i*/ ? HEAP32[buf] :
         HEAPF64[buf++ >> 1]
        );
        ++buf;
      }
      return readEmAsmArgsArray;
    }
  function runEmAsmFunction(code, sigPtr, argbuf) {
      var args = readEmAsmArgs(sigPtr, argbuf);
      if (!ASM_CONSTS.hasOwnProperty(code)) abort('No EM_ASM constant found at address ' + code);
      return ASM_CONSTS[code].apply(null, args);
    }
  function _emscripten_asm_const_int(code, sigPtr, argbuf) {
      return runEmAsmFunction(code, sigPtr, argbuf);
    }

  function runMainThreadEmAsm(code, sigPtr, argbuf, sync) {
      var args = readEmAsmArgs(sigPtr, argbuf);
      if (!ASM_CONSTS.hasOwnProperty(code)) abort('No EM_ASM constant found at address ' + code);
      return ASM_CONSTS[code].apply(null, args);
    }
  function _emscripten_asm_const_int_sync_on_main_thread(code, sigPtr, argbuf) {
      return runMainThreadEmAsm(code, sigPtr, argbuf, 1);
    }

  function _emscripten_cancel_main_loop() {
      Browser.mainLoop.pause();
      Browser.mainLoop.func = null;
    }

  function _emscripten_date_now() {
      return Date.now();
    }

  function withStackSave(f) {
      var stack = stackSave();
      var ret = f();
      stackRestore(stack);
      return ret;
    }
  var JSEvents = {inEventHandler:0,removeAllEventListeners:function() {
        for (var i = JSEvents.eventHandlers.length-1; i >= 0; --i) {
          JSEvents._removeHandler(i);
        }
        JSEvents.eventHandlers = [];
        JSEvents.deferredCalls = [];
      },registerRemoveEventListeners:function() {
        if (!JSEvents.removeEventListenersRegistered) {
          __ATEXIT__.push(JSEvents.removeAllEventListeners);
          JSEvents.removeEventListenersRegistered = true;
        }
      },deferredCalls:[],deferCall:function(targetFunction, precedence, argsList) {
        function arraysHaveEqualContent(arrA, arrB) {
          if (arrA.length != arrB.length) return false;
  
          for (var i in arrA) {
            if (arrA[i] != arrB[i]) return false;
          }
          return true;
        }
        // Test if the given call was already queued, and if so, don't add it again.
        for (var i in JSEvents.deferredCalls) {
          var call = JSEvents.deferredCalls[i];
          if (call.targetFunction == targetFunction && arraysHaveEqualContent(call.argsList, argsList)) {
            return;
          }
        }
        JSEvents.deferredCalls.push({
          targetFunction: targetFunction,
          precedence: precedence,
          argsList: argsList
        });
  
        JSEvents.deferredCalls.sort(function(x,y) { return x.precedence < y.precedence; });
      },removeDeferredCalls:function(targetFunction) {
        for (var i = 0; i < JSEvents.deferredCalls.length; ++i) {
          if (JSEvents.deferredCalls[i].targetFunction == targetFunction) {
            JSEvents.deferredCalls.splice(i, 1);
            --i;
          }
        }
      },canPerformEventHandlerRequests:function() {
        return JSEvents.inEventHandler && JSEvents.currentEventHandler.allowsDeferredCalls;
      },runDeferredCalls:function() {
        if (!JSEvents.canPerformEventHandlerRequests()) {
          return;
        }
        for (var i = 0; i < JSEvents.deferredCalls.length; ++i) {
          var call = JSEvents.deferredCalls[i];
          JSEvents.deferredCalls.splice(i, 1);
          --i;
          call.targetFunction.apply(null, call.argsList);
        }
      },eventHandlers:[],removeAllHandlersOnTarget:function(target, eventTypeString) {
        for (var i = 0; i < JSEvents.eventHandlers.length; ++i) {
          if (JSEvents.eventHandlers[i].target == target && 
            (!eventTypeString || eventTypeString == JSEvents.eventHandlers[i].eventTypeString)) {
             JSEvents._removeHandler(i--);
           }
        }
      },_removeHandler:function(i) {
        var h = JSEvents.eventHandlers[i];
        h.target.removeEventListener(h.eventTypeString, h.eventListenerFunc, h.useCapture);
        JSEvents.eventHandlers.splice(i, 1);
      },registerOrRemoveHandler:function(eventHandler) {
        var jsEventHandler = function jsEventHandler(event) {
          // Increment nesting count for the event handler.
          ++JSEvents.inEventHandler;
          JSEvents.currentEventHandler = eventHandler;
          // Process any old deferred calls the user has placed.
          JSEvents.runDeferredCalls();
          // Process the actual event, calls back to user C code handler.
          eventHandler.handlerFunc(event);
          // Process any new deferred calls that were placed right now from this event handler.
          JSEvents.runDeferredCalls();
          // Out of event handler - restore nesting count.
          --JSEvents.inEventHandler;
        };
        
        if (eventHandler.callbackfunc) {
          eventHandler.eventListenerFunc = jsEventHandler;
          eventHandler.target.addEventListener(eventHandler.eventTypeString, jsEventHandler, eventHandler.useCapture);
          JSEvents.eventHandlers.push(eventHandler);
          JSEvents.registerRemoveEventListeners();
        } else {
          for (var i = 0; i < JSEvents.eventHandlers.length; ++i) {
            if (JSEvents.eventHandlers[i].target == eventHandler.target
             && JSEvents.eventHandlers[i].eventTypeString == eventHandler.eventTypeString) {
               JSEvents._removeHandler(i--);
             }
          }
        }
      },getNodeNameForTarget:function(target) {
        if (!target) return '';
        if (target == window) return '#window';
        if (target == screen) return '#screen';
        return (target && target.nodeName) ? target.nodeName : '';
      },fullscreenEnabled:function() {
        return document.fullscreenEnabled
        // Safari 13.0.3 on macOS Catalina 10.15.1 still ships with prefixed webkitFullscreenEnabled.
        // TODO: If Safari at some point ships with unprefixed version, update the version check above.
        || document.webkitFullscreenEnabled
         ;
      }};
  
  var currentFullscreenStrategy = {};
  
  
  
  
  function maybeCStringToJsString(cString) {
      // "cString > 2" checks if the input is a number, and isn't of the special
      // values we accept here, EMSCRIPTEN_EVENT_TARGET_* (which map to 0, 1, 2).
      // In other words, if cString > 2 then it's a pointer to a valid place in
      // memory, and points to a C string.
      return cString > 2 ? UTF8ToString(cString) : cString;
    }
  
  var specialHTMLTargets = [0, typeof document != 'undefined' ? document : 0, typeof window != 'undefined' ? window : 0];
  function findEventTarget(target) {
      target = maybeCStringToJsString(target);
      var domElement = specialHTMLTargets[target] || (typeof document != 'undefined' ? document.querySelector(target) : undefined);
      return domElement;
    }
  function findCanvasEventTarget(target) { return findEventTarget(target); }
  function _emscripten_get_canvas_element_size(target, width, height) {
      var canvas = findCanvasEventTarget(target);
      if (!canvas) return -4;
      HEAP32[((width)>>2)] = canvas.width;
      HEAP32[((height)>>2)] = canvas.height;
    }
  
  function getCanvasElementSize(target) {
      return withStackSave(function() {
        var w = stackAlloc(8);
        var h = w + 4;
  
        var targetInt = stackAlloc(target.id.length+1);
        stringToUTF8(target.id, targetInt, target.id.length+1);
        var ret = _emscripten_get_canvas_element_size(targetInt, w, h);
        var size = [HEAP32[((w)>>2)], HEAP32[((h)>>2)]];
        return size;
      });
    }
  
  
  function _emscripten_set_canvas_element_size(target, width, height) {
      var canvas = findCanvasEventTarget(target);
      if (!canvas) return -4;
      canvas.width = width;
      canvas.height = height;
      return 0;
    }
  
  function setCanvasElementSize(target, width, height) {
      if (!target.controlTransferredOffscreen) {
        target.width = width;
        target.height = height;
      } else {
        // This function is being called from high-level JavaScript code instead of asm.js/Wasm,
        // and it needs to synchronously proxy over to another thread, so marshal the string onto the heap to do the call.
        withStackSave(function() {
          var targetInt = stackAlloc(target.id.length+1);
          stringToUTF8(target.id, targetInt, target.id.length+1);
          _emscripten_set_canvas_element_size(targetInt, width, height);
        });
      }
    }
  
  function registerRestoreOldStyle(canvas) {
      var canvasSize = getCanvasElementSize(canvas);
      var oldWidth = canvasSize[0];
      var oldHeight = canvasSize[1];
      var oldCssWidth = canvas.style.width;
      var oldCssHeight = canvas.style.height;
      var oldBackgroundColor = canvas.style.backgroundColor; // Chrome reads color from here.
      var oldDocumentBackgroundColor = document.body.style.backgroundColor; // IE11 reads color from here.
      // Firefox always has black background color.
      var oldPaddingLeft = canvas.style.paddingLeft; // Chrome, FF, Safari
      var oldPaddingRight = canvas.style.paddingRight;
      var oldPaddingTop = canvas.style.paddingTop;
      var oldPaddingBottom = canvas.style.paddingBottom;
      var oldMarginLeft = canvas.style.marginLeft; // IE11
      var oldMarginRight = canvas.style.marginRight;
      var oldMarginTop = canvas.style.marginTop;
      var oldMarginBottom = canvas.style.marginBottom;
      var oldDocumentBodyMargin = document.body.style.margin;
      var oldDocumentOverflow = document.documentElement.style.overflow; // Chrome, Firefox
      var oldDocumentScroll = document.body.scroll; // IE
      var oldImageRendering = canvas.style.imageRendering;
  
      function restoreOldStyle() {
        var fullscreenElement = document.fullscreenElement
          || document.webkitFullscreenElement
          ;
        if (!fullscreenElement) {
          document.removeEventListener('fullscreenchange', restoreOldStyle);
  
          // Unprefixed Fullscreen API shipped in Chromium 71 (https://bugs.chromium.org/p/chromium/issues/detail?id=383813)
          // As of Safari 13.0.3 on macOS Catalina 10.15.1 still ships with prefixed webkitfullscreenchange. TODO: revisit this check once Safari ships unprefixed version.
          document.removeEventListener('webkitfullscreenchange', restoreOldStyle);
  
          setCanvasElementSize(canvas, oldWidth, oldHeight);
  
          canvas.style.width = oldCssWidth;
          canvas.style.height = oldCssHeight;
          canvas.style.backgroundColor = oldBackgroundColor; // Chrome
          // IE11 hack: assigning 'undefined' or an empty string to document.body.style.backgroundColor has no effect, so first assign back the default color
          // before setting the undefined value. Setting undefined value is also important, or otherwise we would later treat that as something that the user
          // had explicitly set so subsequent fullscreen transitions would not set background color properly.
          if (!oldDocumentBackgroundColor) document.body.style.backgroundColor = 'white';
          document.body.style.backgroundColor = oldDocumentBackgroundColor; // IE11
          canvas.style.paddingLeft = oldPaddingLeft; // Chrome, FF, Safari
          canvas.style.paddingRight = oldPaddingRight;
          canvas.style.paddingTop = oldPaddingTop;
          canvas.style.paddingBottom = oldPaddingBottom;
          canvas.style.marginLeft = oldMarginLeft; // IE11
          canvas.style.marginRight = oldMarginRight;
          canvas.style.marginTop = oldMarginTop;
          canvas.style.marginBottom = oldMarginBottom;
          document.body.style.margin = oldDocumentBodyMargin;
          document.documentElement.style.overflow = oldDocumentOverflow; // Chrome, Firefox
          document.body.scroll = oldDocumentScroll; // IE
          canvas.style.imageRendering = oldImageRendering;
          if (canvas.GLctxObject) canvas.GLctxObject.GLctx.viewport(0, 0, oldWidth, oldHeight);
  
          if (currentFullscreenStrategy.canvasResizedCallback) {
            getWasmTableEntry(currentFullscreenStrategy.canvasResizedCallback)(37, 0, currentFullscreenStrategy.canvasResizedCallbackUserData);
          }
        }
      }
      document.addEventListener('fullscreenchange', restoreOldStyle);
      // Unprefixed Fullscreen API shipped in Chromium 71 (https://bugs.chromium.org/p/chromium/issues/detail?id=383813)
      // As of Safari 13.0.3 on macOS Catalina 10.15.1 still ships with prefixed webkitfullscreenchange. TODO: revisit this check once Safari ships unprefixed version.
      document.addEventListener('webkitfullscreenchange', restoreOldStyle);
      return restoreOldStyle;
    }
  
  
  function setLetterbox(element, topBottom, leftRight) {
        // Cannot use margin to specify letterboxes in FF or Chrome, since those ignore margins in fullscreen mode.
        element.style.paddingLeft = element.style.paddingRight = leftRight + 'px';
        element.style.paddingTop = element.style.paddingBottom = topBottom + 'px';
    }
  
  
  function getBoundingClientRect(e) {
      return specialHTMLTargets.indexOf(e) < 0 ? e.getBoundingClientRect() : {'left':0,'top':0};
    }
  function JSEvents_resizeCanvasForFullscreen(target, strategy) {
      var restoreOldStyle = registerRestoreOldStyle(target);
      var cssWidth = strategy.softFullscreen ? innerWidth : screen.width;
      var cssHeight = strategy.softFullscreen ? innerHeight : screen.height;
      var rect = getBoundingClientRect(target);
      var windowedCssWidth = rect.width;
      var windowedCssHeight = rect.height;
      var canvasSize = getCanvasElementSize(target);
      var windowedRttWidth = canvasSize[0];
      var windowedRttHeight = canvasSize[1];
  
      if (strategy.scaleMode == 3) {
        setLetterbox(target, (cssHeight - windowedCssHeight) / 2, (cssWidth - windowedCssWidth) / 2);
        cssWidth = windowedCssWidth;
        cssHeight = windowedCssHeight;
      } else if (strategy.scaleMode == 2) {
        if (cssWidth*windowedRttHeight < windowedRttWidth*cssHeight) {
          var desiredCssHeight = windowedRttHeight * cssWidth / windowedRttWidth;
          setLetterbox(target, (cssHeight - desiredCssHeight) / 2, 0);
          cssHeight = desiredCssHeight;
        } else {
          var desiredCssWidth = windowedRttWidth * cssHeight / windowedRttHeight;
          setLetterbox(target, 0, (cssWidth - desiredCssWidth) / 2);
          cssWidth = desiredCssWidth;
        }
      }
  
      // If we are adding padding, must choose a background color or otherwise Chrome will give the
      // padding a default white color. Do it only if user has not customized their own background color.
      if (!target.style.backgroundColor) target.style.backgroundColor = 'black';
      // IE11 does the same, but requires the color to be set in the document body.
      if (!document.body.style.backgroundColor) document.body.style.backgroundColor = 'black'; // IE11
      // Firefox always shows black letterboxes independent of style color.
  
      target.style.width = cssWidth + 'px';
      target.style.height = cssHeight + 'px';
  
      if (strategy.filteringMode == 1) {
        target.style.imageRendering = 'optimizeSpeed';
        target.style.imageRendering = '-moz-crisp-edges';
        target.style.imageRendering = '-o-crisp-edges';
        target.style.imageRendering = '-webkit-optimize-contrast';
        target.style.imageRendering = 'optimize-contrast';
        target.style.imageRendering = 'crisp-edges';
        target.style.imageRendering = 'pixelated';
      }
  
      var dpiScale = (strategy.canvasResolutionScaleMode == 2) ? devicePixelRatio : 1;
      if (strategy.canvasResolutionScaleMode != 0) {
        var newWidth = (cssWidth * dpiScale)|0;
        var newHeight = (cssHeight * dpiScale)|0;
        setCanvasElementSize(target, newWidth, newHeight);
        if (target.GLctxObject) target.GLctxObject.GLctx.viewport(0, 0, newWidth, newHeight);
      }
      return restoreOldStyle;
    }
  
  function JSEvents_requestFullscreen(target, strategy) {
      // EMSCRIPTEN_FULLSCREEN_SCALE_DEFAULT + EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_NONE is a mode where no extra logic is performed to the DOM elements.
      if (strategy.scaleMode != 0 || strategy.canvasResolutionScaleMode != 0) {
        JSEvents_resizeCanvasForFullscreen(target, strategy);
      }
  
      if (target.requestFullscreen) {
        target.requestFullscreen();
      } else if (target.webkitRequestFullscreen) {
        target.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
      } else {
        return JSEvents.fullscreenEnabled() ? -3 : -1;
      }
  
      currentFullscreenStrategy = strategy;
  
      if (strategy.canvasResizedCallback) {
        getWasmTableEntry(strategy.canvasResizedCallback)(37, 0, strategy.canvasResizedCallbackUserData);
      }
  
      return 0;
    }
  
  function _emscripten_exit_fullscreen() {
      if (!JSEvents.fullscreenEnabled()) return -1;
      // Make sure no queued up calls will fire after this.
      JSEvents.removeDeferredCalls(JSEvents_requestFullscreen);
  
      var d = specialHTMLTargets[1];
      if (d.exitFullscreen) {
        d.fullscreenElement && d.exitFullscreen();
      } else if (d.webkitExitFullscreen) {
        d.webkitFullscreenElement && d.webkitExitFullscreen();
      } else {
        return -1;
      }
  
      return 0;
    }

  
  function requestPointerLock(target) {
      if (target.requestPointerLock) {
        target.requestPointerLock();
      } else {
        // document.body is known to accept pointer lock, so use that to differentiate if the user passed a bad element,
        // or if the whole browser just doesn't support the feature.
        if (document.body.requestPointerLock
          ) {
          return -3;
        }
        return -1;
      }
      return 0;
    }
  function _emscripten_exit_pointerlock() {
      // Make sure no queued up calls will fire after this.
      JSEvents.removeDeferredCalls(requestPointerLock);
  
      if (document.exitPointerLock) {
        document.exitPointerLock();
      } else {
        return -1;
      }
      return 0;
    }

  function _emscripten_get_device_pixel_ratio() {
      return (typeof devicePixelRatio == 'number' && devicePixelRatio) || 1.0;
    }

  
  
  function _emscripten_get_element_css_size(target, width, height) {
      target = findEventTarget(target);
      if (!target) return -4;
  
      var rect = getBoundingClientRect(target);
      HEAPF64[((width)>>3)] = rect.width;
      HEAPF64[((height)>>3)] = rect.height;
  
      return 0;
    }

  
  function fillGamepadEventData(eventStruct, e) {
      HEAPF64[((eventStruct)>>3)] = e.timestamp;
      for (var i = 0; i < e.axes.length; ++i) {
        HEAPF64[(((eventStruct+i*8)+(16))>>3)] = e.axes[i];
      }
      for (var i = 0; i < e.buttons.length; ++i) {
        if (typeof e.buttons[i] == 'object') {
          HEAPF64[(((eventStruct+i*8)+(528))>>3)] = e.buttons[i].value;
        } else {
          HEAPF64[(((eventStruct+i*8)+(528))>>3)] = e.buttons[i];
        }
      }
      for (var i = 0; i < e.buttons.length; ++i) {
        if (typeof e.buttons[i] == 'object') {
          HEAP32[(((eventStruct+i*4)+(1040))>>2)] = e.buttons[i].pressed;
        } else {
          // Assigning a boolean to HEAP32, that's ok, but Closure would like to warn about it:
          /** @suppress {checkTypes} */
          HEAP32[(((eventStruct+i*4)+(1040))>>2)] = e.buttons[i] == 1;
        }
      }
      HEAP32[(((eventStruct)+(1296))>>2)] = e.connected;
      HEAP32[(((eventStruct)+(1300))>>2)] = e.index;
      HEAP32[(((eventStruct)+(8))>>2)] = e.axes.length;
      HEAP32[(((eventStruct)+(12))>>2)] = e.buttons.length;
      stringToUTF8(e.id, eventStruct + 1304, 64);
      stringToUTF8(e.mapping, eventStruct + 1368, 64);
    }
  function _emscripten_get_gamepad_status(index, gamepadState) {
      if (!JSEvents.lastGamepadState) throw 'emscripten_get_gamepad_status() can only be called after having first called emscripten_sample_gamepad_data() and that function has returned EMSCRIPTEN_RESULT_SUCCESS!';
  
      // INVALID_PARAM is returned on a Gamepad index that never was there.
      if (index < 0 || index >= JSEvents.lastGamepadState.length) return -5;
  
      // NO_DATA is returned on a Gamepad index that was removed.
      // For previously disconnected gamepads there should be an empty slot (null/undefined/false) at the index.
      // This is because gamepads must keep their original position in the array.
      // For example, removing the first of two gamepads produces [null/undefined/false, gamepad].
      if (!JSEvents.lastGamepadState[index]) return -7;
  
      fillGamepadEventData(gamepadState, JSEvents.lastGamepadState[index]);
      return 0;
    }


  function _emscripten_get_num_gamepads() {
      if (!JSEvents.lastGamepadState) throw 'emscripten_get_num_gamepads() can only be called after having first called emscripten_sample_gamepad_data() and that function has returned EMSCRIPTEN_RESULT_SUCCESS!';
      // N.B. Do not call emscripten_get_num_gamepads() unless having first called emscripten_sample_gamepad_data(), and that has returned EMSCRIPTEN_RESULT_SUCCESS.
      // Otherwise the following line will throw an exception.
      return JSEvents.lastGamepadState.length;
    }

  
  
  function _emscripten_get_preloaded_image_data(path, w, h) {
      if ((path | 0) === path) path = UTF8ToString(path);
  
      path = PATH_FS.resolve(path);
  
      var canvas = /** @type {HTMLCanvasElement} */(preloadedImages[path]);
      if (canvas) {
        var ctx = canvas.getContext("2d");
        var image = ctx.getImageData(0, 0, canvas.width, canvas.height);
        var buf = _malloc(canvas.width * canvas.height * 4);
  
        HEAPU8.set(image.data, buf);
  
        HEAP32[((w)>>2)] = canvas.width;
        HEAP32[((h)>>2)] = canvas.height;
        return buf;
      }
  
      return 0;
    }

  
  
  function _emscripten_get_preloaded_image_data_from_FILE(file, w, h) {
      var fd = _fileno(file);
      var stream = FS.getStream(fd);
      if (stream) {
        return _emscripten_get_preloaded_image_data(stream.path, w, h);
      }
  
      return 0;
    }

  function _emscripten_get_screen_size(width, height) {
      HEAP32[((width)>>2)] = screen.width;
      HEAP32[((height)>>2)] = screen.height;
    }

  function _emscripten_glActiveTexture(x0) { GLctx['activeTexture'](x0) }

  function _emscripten_glAttachShader(program, shader) {
      GLctx.attachShader(GL.programs[program], GL.shaders[shader]);
    }

  function _emscripten_glBeginQuery(target, id) {
      GLctx['beginQuery'](target, GL.queries[id]);
    }

  function _emscripten_glBeginQueryEXT(target, id) {
      GLctx.disjointTimerQueryExt['beginQueryEXT'](target, GL.queries[id]);
    }

  function _emscripten_glBeginTransformFeedback(x0) { GLctx['beginTransformFeedback'](x0) }

  function _emscripten_glBindAttribLocation(program, index, name) {
      GLctx.bindAttribLocation(GL.programs[program], index, UTF8ToString(name));
    }

  function _emscripten_glBindBuffer(target, buffer) {
      if (target == 0x8892 /*GL_ARRAY_BUFFER*/) {
        GLctx.currentArrayBufferBinding = buffer;
      } else if (target == 0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/) {
        GLctx.currentElementArrayBufferBinding = buffer;
      }
  
      if (target == 0x88EB /*GL_PIXEL_PACK_BUFFER*/) {
        // In WebGL 2 glReadPixels entry point, we need to use a different WebGL 2 API function call when a buffer is bound to
        // GL_PIXEL_PACK_BUFFER_BINDING point, so must keep track whether that binding point is non-null to know what is
        // the proper API function to call.
        GLctx.currentPixelPackBufferBinding = buffer;
      } else if (target == 0x88EC /*GL_PIXEL_UNPACK_BUFFER*/) {
        // In WebGL 2 gl(Compressed)Tex(Sub)Image[23]D entry points, we need to
        // use a different WebGL 2 API function call when a buffer is bound to
        // GL_PIXEL_UNPACK_BUFFER_BINDING point, so must keep track whether that
        // binding point is non-null to know what is the proper API function to
        // call.
        GLctx.currentPixelUnpackBufferBinding = buffer;
      }
      GLctx.bindBuffer(target, GL.buffers[buffer]);
    }

  function _emscripten_glBindBufferBase(target, index, buffer) {
      GLctx['bindBufferBase'](target, index, GL.buffers[buffer]);
    }

  function _emscripten_glBindBufferRange(target, index, buffer, offset, ptrsize) {
      GLctx['bindBufferRange'](target, index, GL.buffers[buffer], offset, ptrsize);
    }

  function _emscripten_glBindFramebuffer(target, framebuffer) {
  
      GLctx.bindFramebuffer(target, GL.framebuffers[framebuffer]);
  
    }

  function _emscripten_glBindRenderbuffer(target, renderbuffer) {
      GLctx.bindRenderbuffer(target, GL.renderbuffers[renderbuffer]);
    }

  function _emscripten_glBindSampler(unit, sampler) {
      GLctx['bindSampler'](unit, GL.samplers[sampler]);
    }

  function _emscripten_glBindTexture(target, texture) {
      GLctx.bindTexture(target, GL.textures[texture]);
    }

  function _emscripten_glBindTransformFeedback(target, id) {
      GLctx['bindTransformFeedback'](target, GL.transformFeedbacks[id]);
    }

  function _emscripten_glBindVertexArray(vao) {
      GLctx['bindVertexArray'](GL.vaos[vao]);
      var ibo = GLctx.getParameter(0x8895 /*ELEMENT_ARRAY_BUFFER_BINDING*/);
      GLctx.currentElementArrayBufferBinding = ibo ? (ibo.name | 0) : 0;
    }

  function _emscripten_glBindVertexArrayOES(vao) {
      GLctx['bindVertexArray'](GL.vaos[vao]);
      var ibo = GLctx.getParameter(0x8895 /*ELEMENT_ARRAY_BUFFER_BINDING*/);
      GLctx.currentElementArrayBufferBinding = ibo ? (ibo.name | 0) : 0;
    }

  function _emscripten_glBlendColor(x0, x1, x2, x3) { GLctx['blendColor'](x0, x1, x2, x3) }

  function _emscripten_glBlendEquation(x0) { GLctx['blendEquation'](x0) }

  function _emscripten_glBlendEquationSeparate(x0, x1) { GLctx['blendEquationSeparate'](x0, x1) }

  function _emscripten_glBlendFunc(x0, x1) { GLctx['blendFunc'](x0, x1) }

  function _emscripten_glBlendFuncSeparate(x0, x1, x2, x3) { GLctx['blendFuncSeparate'](x0, x1, x2, x3) }

  function _emscripten_glBlitFramebuffer(x0, x1, x2, x3, x4, x5, x6, x7, x8, x9) { GLctx['blitFramebuffer'](x0, x1, x2, x3, x4, x5, x6, x7, x8, x9) }

  function _emscripten_glBufferData(target, size, data, usage) {
  
      if (true) { // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
        // If size is zero, WebGL would interpret uploading the whole input arraybuffer (starting from given offset), which would
        // not make sense in WebAssembly, so avoid uploading if size is zero. However we must still call bufferData to establish a
        // backing storage of zero bytes.
        if (data && size) {
          GLctx.bufferData(target, HEAPU8, usage, data, size);
        } else {
          GLctx.bufferData(target, size, usage);
        }
      } else {
        // N.b. here first form specifies a heap subarray, second form an integer size, so the ?: code here is polymorphic. It is advised to avoid
        // randomly mixing both uses in calling code, to avoid any potential JS engine JIT issues.
        GLctx.bufferData(target, data ? HEAPU8.subarray(data, data+size) : size, usage);
      }
    }

  function _emscripten_glBufferSubData(target, offset, size, data) {
      if (true) { // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
        size && GLctx.bufferSubData(target, offset, HEAPU8, data, size);
        return;
      }
      GLctx.bufferSubData(target, offset, HEAPU8.subarray(data, data+size));
    }

  function _emscripten_glCheckFramebufferStatus(x0) { return GLctx['checkFramebufferStatus'](x0) }

  function _emscripten_glClear(x0) { GLctx['clear'](x0) }

  function _emscripten_glClearBufferfi(x0, x1, x2, x3) { GLctx['clearBufferfi'](x0, x1, x2, x3) }

  function _emscripten_glClearBufferfv(buffer, drawbuffer, value) {
  
      GLctx['clearBufferfv'](buffer, drawbuffer, HEAPF32, value>>2);
    }

  function _emscripten_glClearBufferiv(buffer, drawbuffer, value) {
  
      GLctx['clearBufferiv'](buffer, drawbuffer, HEAP32, value>>2);
    }

  function _emscripten_glClearBufferuiv(buffer, drawbuffer, value) {
  
      GLctx['clearBufferuiv'](buffer, drawbuffer, HEAPU32, value>>2);
    }

  function _emscripten_glClearColor(x0, x1, x2, x3) { GLctx['clearColor'](x0, x1, x2, x3) }

  function _emscripten_glClearDepthf(x0) { GLctx['clearDepth'](x0) }

  function _emscripten_glClearStencil(x0) { GLctx['clearStencil'](x0) }

  function convertI32PairToI53(lo, hi) {
      // This function should not be getting called with too large unsigned numbers
      // in high part (if hi >= 0x7FFFFFFFF, one should have been calling
      // convertU32PairToI53())
      assert(hi === (hi|0));
      return (lo >>> 0) + hi * 4294967296;
    }
  function _emscripten_glClientWaitSync(sync, flags, timeout_low, timeout_high) {
      // WebGL2 vs GLES3 differences: in GLES3, the timeout parameter is a uint64, where 0xFFFFFFFFFFFFFFFFULL means GL_TIMEOUT_IGNORED.
      // In JS, there's no 64-bit value types, so instead timeout is taken to be signed, and GL_TIMEOUT_IGNORED is given value -1.
      // Inherently the value accepted in the timeout is lossy, and can't take in arbitrary u64 bit pattern (but most likely doesn't matter)
      // See https://www.khronos.org/registry/webgl/specs/latest/2.0/#5.15
      var timeout = convertI32PairToI53(timeout_low, timeout_high);
      return GLctx.clientWaitSync(GL.syncs[sync], flags, timeout);
    }

  function _emscripten_glColorMask(red, green, blue, alpha) {
      GLctx.colorMask(!!red, !!green, !!blue, !!alpha);
    }

  function _emscripten_glCompileShader(shader) {
      GLctx.compileShader(GL.shaders[shader]);
    }

  function _emscripten_glCompressedTexImage2D(target, level, internalFormat, width, height, border, imageSize, data) {
      if (true) { // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
        if (GLctx.currentPixelUnpackBufferBinding || !imageSize) {
          GLctx['compressedTexImage2D'](target, level, internalFormat, width, height, border, imageSize, data);
        } else {
          GLctx['compressedTexImage2D'](target, level, internalFormat, width, height, border, HEAPU8, data, imageSize);
        }
        return;
      }
      GLctx['compressedTexImage2D'](target, level, internalFormat, width, height, border, data ? HEAPU8.subarray((data), (data+imageSize)) : null);
    }

  function _emscripten_glCompressedTexImage3D(target, level, internalFormat, width, height, depth, border, imageSize, data) {
      if (GLctx.currentPixelUnpackBufferBinding) {
        GLctx['compressedTexImage3D'](target, level, internalFormat, width, height, depth, border, imageSize, data);
      } else {
        GLctx['compressedTexImage3D'](target, level, internalFormat, width, height, depth, border, HEAPU8, data, imageSize);
      }
    }

  function _emscripten_glCompressedTexSubImage2D(target, level, xoffset, yoffset, width, height, format, imageSize, data) {
      if (true) { // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
        if (GLctx.currentPixelUnpackBufferBinding || !imageSize) {
          GLctx['compressedTexSubImage2D'](target, level, xoffset, yoffset, width, height, format, imageSize, data);
        } else {
          GLctx['compressedTexSubImage2D'](target, level, xoffset, yoffset, width, height, format, HEAPU8, data, imageSize);
        }
        return;
      }
      GLctx['compressedTexSubImage2D'](target, level, xoffset, yoffset, width, height, format, data ? HEAPU8.subarray((data), (data+imageSize)) : null);
    }

  function _emscripten_glCompressedTexSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, imageSize, data) {
      if (GLctx.currentPixelUnpackBufferBinding) {
        GLctx['compressedTexSubImage3D'](target, level, xoffset, yoffset, zoffset, width, height, depth, format, imageSize, data);
      } else {
        GLctx['compressedTexSubImage3D'](target, level, xoffset, yoffset, zoffset, width, height, depth, format, HEAPU8, data, imageSize);
      }
    }

  function _emscripten_glCopyBufferSubData(x0, x1, x2, x3, x4) { GLctx['copyBufferSubData'](x0, x1, x2, x3, x4) }

  function _emscripten_glCopyTexImage2D(x0, x1, x2, x3, x4, x5, x6, x7) { GLctx['copyTexImage2D'](x0, x1, x2, x3, x4, x5, x6, x7) }

  function _emscripten_glCopyTexSubImage2D(x0, x1, x2, x3, x4, x5, x6, x7) { GLctx['copyTexSubImage2D'](x0, x1, x2, x3, x4, x5, x6, x7) }

  function _emscripten_glCopyTexSubImage3D(x0, x1, x2, x3, x4, x5, x6, x7, x8) { GLctx['copyTexSubImage3D'](x0, x1, x2, x3, x4, x5, x6, x7, x8) }

  function _emscripten_glCreateProgram() {
      var id = GL.getNewId(GL.programs);
      var program = GLctx.createProgram();
      // Store additional information needed for each shader program:
      program.name = id;
      // Lazy cache results of glGetProgramiv(GL_ACTIVE_UNIFORM_MAX_LENGTH/GL_ACTIVE_ATTRIBUTE_MAX_LENGTH/GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH)
      program.maxUniformLength = program.maxAttributeLength = program.maxUniformBlockNameLength = 0;
      program.uniformIdCounter = 1;
      GL.programs[id] = program;
      return id;
    }

  function _emscripten_glCreateShader(shaderType) {
      var id = GL.getNewId(GL.shaders);
      GL.shaders[id] = GLctx.createShader(shaderType);
  
      return id;
    }

  function _emscripten_glCullFace(x0) { GLctx['cullFace'](x0) }

  function _emscripten_glDeleteBuffers(n, buffers) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((buffers)+(i*4))>>2)];
        var buffer = GL.buffers[id];
  
        // From spec: "glDeleteBuffers silently ignores 0's and names that do not
        // correspond to existing buffer objects."
        if (!buffer) continue;
  
        GLctx.deleteBuffer(buffer);
        buffer.name = 0;
        GL.buffers[id] = null;
  
        if (id == GLctx.currentArrayBufferBinding) GLctx.currentArrayBufferBinding = 0;
        if (id == GLctx.currentElementArrayBufferBinding) GLctx.currentElementArrayBufferBinding = 0;
        if (id == GLctx.currentPixelPackBufferBinding) GLctx.currentPixelPackBufferBinding = 0;
        if (id == GLctx.currentPixelUnpackBufferBinding) GLctx.currentPixelUnpackBufferBinding = 0;
      }
    }

  function _emscripten_glDeleteFramebuffers(n, framebuffers) {
      for (var i = 0; i < n; ++i) {
        var id = HEAP32[(((framebuffers)+(i*4))>>2)];
        var framebuffer = GL.framebuffers[id];
        if (!framebuffer) continue; // GL spec: "glDeleteFramebuffers silently ignores 0s and names that do not correspond to existing framebuffer objects".
        GLctx.deleteFramebuffer(framebuffer);
        framebuffer.name = 0;
        GL.framebuffers[id] = null;
      }
    }

  function _emscripten_glDeleteProgram(id) {
      if (!id) return;
      var program = GL.programs[id];
      if (!program) { // glDeleteProgram actually signals an error when deleting a nonexisting object, unlike some other GL delete functions.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      GLctx.deleteProgram(program);
      program.name = 0;
      GL.programs[id] = null;
    }

  function _emscripten_glDeleteQueries(n, ids) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((ids)+(i*4))>>2)];
        var query = GL.queries[id];
        if (!query) continue; // GL spec: "unused names in ids are ignored, as is the name zero."
        GLctx['deleteQuery'](query);
        GL.queries[id] = null;
      }
    }

  function _emscripten_glDeleteQueriesEXT(n, ids) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((ids)+(i*4))>>2)];
        var query = GL.queries[id];
        if (!query) continue; // GL spec: "unused names in ids are ignored, as is the name zero."
        GLctx.disjointTimerQueryExt['deleteQueryEXT'](query);
        GL.queries[id] = null;
      }
    }

  function _emscripten_glDeleteRenderbuffers(n, renderbuffers) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((renderbuffers)+(i*4))>>2)];
        var renderbuffer = GL.renderbuffers[id];
        if (!renderbuffer) continue; // GL spec: "glDeleteRenderbuffers silently ignores 0s and names that do not correspond to existing renderbuffer objects".
        GLctx.deleteRenderbuffer(renderbuffer);
        renderbuffer.name = 0;
        GL.renderbuffers[id] = null;
      }
    }

  function _emscripten_glDeleteSamplers(n, samplers) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((samplers)+(i*4))>>2)];
        var sampler = GL.samplers[id];
        if (!sampler) continue;
        GLctx['deleteSampler'](sampler);
        sampler.name = 0;
        GL.samplers[id] = null;
      }
    }

  function _emscripten_glDeleteShader(id) {
      if (!id) return;
      var shader = GL.shaders[id];
      if (!shader) { // glDeleteShader actually signals an error when deleting a nonexisting object, unlike some other GL delete functions.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      GLctx.deleteShader(shader);
      GL.shaders[id] = null;
    }

  function _emscripten_glDeleteSync(id) {
      if (!id) return;
      var sync = GL.syncs[id];
      if (!sync) { // glDeleteSync signals an error when deleting a nonexisting object, unlike some other GL delete functions.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      GLctx.deleteSync(sync);
      sync.name = 0;
      GL.syncs[id] = null;
    }

  function _emscripten_glDeleteTextures(n, textures) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((textures)+(i*4))>>2)];
        var texture = GL.textures[id];
        if (!texture) continue; // GL spec: "glDeleteTextures silently ignores 0s and names that do not correspond to existing textures".
        GLctx.deleteTexture(texture);
        texture.name = 0;
        GL.textures[id] = null;
      }
    }

  function _emscripten_glDeleteTransformFeedbacks(n, ids) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((ids)+(i*4))>>2)];
        var transformFeedback = GL.transformFeedbacks[id];
        if (!transformFeedback) continue; // GL spec: "unused names in ids are ignored, as is the name zero."
        GLctx['deleteTransformFeedback'](transformFeedback);
        transformFeedback.name = 0;
        GL.transformFeedbacks[id] = null;
      }
    }

  function _emscripten_glDeleteVertexArrays(n, vaos) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((vaos)+(i*4))>>2)];
        GLctx['deleteVertexArray'](GL.vaos[id]);
        GL.vaos[id] = null;
      }
    }

  function _emscripten_glDeleteVertexArraysOES(n, vaos) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((vaos)+(i*4))>>2)];
        GLctx['deleteVertexArray'](GL.vaos[id]);
        GL.vaos[id] = null;
      }
    }

  function _emscripten_glDepthFunc(x0) { GLctx['depthFunc'](x0) }

  function _emscripten_glDepthMask(flag) {
      GLctx.depthMask(!!flag);
    }

  function _emscripten_glDepthRangef(x0, x1) { GLctx['depthRange'](x0, x1) }

  function _emscripten_glDetachShader(program, shader) {
      GLctx.detachShader(GL.programs[program], GL.shaders[shader]);
    }

  function _emscripten_glDisable(x0) { GLctx['disable'](x0) }

  function _emscripten_glDisableVertexAttribArray(index) {
      var cb = GL.currentContext.clientBuffers[index];
      cb.enabled = false;
      GLctx.disableVertexAttribArray(index);
    }

  function _emscripten_glDrawArrays(mode, first, count) {
      // bind any client-side buffers
      GL.preDrawHandleClientVertexAttribBindings(first + count);
  
      GLctx.drawArrays(mode, first, count);
  
      GL.postDrawHandleClientVertexAttribBindings();
    }

  function _emscripten_glDrawArraysInstanced(mode, first, count, primcount) {
      GLctx['drawArraysInstanced'](mode, first, count, primcount);
    }

  function _emscripten_glDrawArraysInstancedANGLE(mode, first, count, primcount) {
      GLctx['drawArraysInstanced'](mode, first, count, primcount);
    }

  function _emscripten_glDrawArraysInstancedARB(mode, first, count, primcount) {
      GLctx['drawArraysInstanced'](mode, first, count, primcount);
    }

  function _emscripten_glDrawArraysInstancedEXT(mode, first, count, primcount) {
      GLctx['drawArraysInstanced'](mode, first, count, primcount);
    }

  function _emscripten_glDrawArraysInstancedNV(mode, first, count, primcount) {
      GLctx['drawArraysInstanced'](mode, first, count, primcount);
    }

  var tempFixedLengthArray = [];
  
  function _emscripten_glDrawBuffers(n, bufs) {
  
      var bufArray = tempFixedLengthArray[n];
      for (var i = 0; i < n; i++) {
        bufArray[i] = HEAP32[(((bufs)+(i*4))>>2)];
      }
  
      GLctx['drawBuffers'](bufArray);
    }

  
  function _emscripten_glDrawBuffersEXT(n, bufs) {
  
      var bufArray = tempFixedLengthArray[n];
      for (var i = 0; i < n; i++) {
        bufArray[i] = HEAP32[(((bufs)+(i*4))>>2)];
      }
  
      GLctx['drawBuffers'](bufArray);
    }

  
  function _emscripten_glDrawBuffersWEBGL(n, bufs) {
  
      var bufArray = tempFixedLengthArray[n];
      for (var i = 0; i < n; i++) {
        bufArray[i] = HEAP32[(((bufs)+(i*4))>>2)];
      }
  
      GLctx['drawBuffers'](bufArray);
    }

  function _emscripten_glDrawElements(mode, count, type, indices) {
      var buf;
      if (!GLctx.currentElementArrayBufferBinding) {
        var size = GL.calcBufLength(1, type, 0, count);
        buf = GL.getTempIndexBuffer(size);
        GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, buf);
        GLctx.bufferSubData(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/,
                                 0,
                                 HEAPU8.subarray(indices, indices + size));
        // the index is now 0
        indices = 0;
      }
  
      // bind any client-side buffers
      GL.preDrawHandleClientVertexAttribBindings(count);
  
      GLctx.drawElements(mode, count, type, indices);
  
      GL.postDrawHandleClientVertexAttribBindings(count);
  
      if (!GLctx.currentElementArrayBufferBinding) {
        GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, null);
      }
    }

  function _emscripten_glDrawElementsInstanced(mode, count, type, indices, primcount) {
      GLctx['drawElementsInstanced'](mode, count, type, indices, primcount);
    }

  function _emscripten_glDrawElementsInstancedANGLE(mode, count, type, indices, primcount) {
      GLctx['drawElementsInstanced'](mode, count, type, indices, primcount);
    }

  function _emscripten_glDrawElementsInstancedARB(mode, count, type, indices, primcount) {
      GLctx['drawElementsInstanced'](mode, count, type, indices, primcount);
    }

  function _emscripten_glDrawElementsInstancedEXT(mode, count, type, indices, primcount) {
      GLctx['drawElementsInstanced'](mode, count, type, indices, primcount);
    }

  function _emscripten_glDrawElementsInstancedNV(mode, count, type, indices, primcount) {
      GLctx['drawElementsInstanced'](mode, count, type, indices, primcount);
    }

  function _glDrawElements(mode, count, type, indices) {
      var buf;
      if (!GLctx.currentElementArrayBufferBinding) {
        var size = GL.calcBufLength(1, type, 0, count);
        buf = GL.getTempIndexBuffer(size);
        GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, buf);
        GLctx.bufferSubData(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/,
                                 0,
                                 HEAPU8.subarray(indices, indices + size));
        // the index is now 0
        indices = 0;
      }
  
      // bind any client-side buffers
      GL.preDrawHandleClientVertexAttribBindings(count);
  
      GLctx.drawElements(mode, count, type, indices);
  
      GL.postDrawHandleClientVertexAttribBindings(count);
  
      if (!GLctx.currentElementArrayBufferBinding) {
        GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, null);
      }
    }
  function _emscripten_glDrawRangeElements(mode, start, end, count, type, indices) {
      // TODO: This should be a trivial pass-though function registered at the bottom of this page as
      // glFuncs[6][1] += ' drawRangeElements';
      // but due to https://bugzilla.mozilla.org/show_bug.cgi?id=1202427,
      // we work around by ignoring the range.
      _glDrawElements(mode, count, type, indices);
    }

  function _emscripten_glEnable(x0) { GLctx['enable'](x0) }

  function _emscripten_glEnableVertexAttribArray(index) {
      var cb = GL.currentContext.clientBuffers[index];
      cb.enabled = true;
      GLctx.enableVertexAttribArray(index);
    }

  function _emscripten_glEndQuery(x0) { GLctx['endQuery'](x0) }

  function _emscripten_glEndQueryEXT(target) {
      GLctx.disjointTimerQueryExt['endQueryEXT'](target);
    }

  function _emscripten_glEndTransformFeedback() { GLctx['endTransformFeedback']() }

  function _emscripten_glFenceSync(condition, flags) {
      var sync = GLctx.fenceSync(condition, flags);
      if (sync) {
        var id = GL.getNewId(GL.syncs);
        sync.name = id;
        GL.syncs[id] = sync;
        return id;
      }
      return 0; // Failed to create a sync object
    }

  function _emscripten_glFinish() { GLctx['finish']() }

  function _emscripten_glFlush() { GLctx['flush']() }

  function emscriptenWebGLGetBufferBinding(target) {
      switch (target) {
        case 0x8892 /*GL_ARRAY_BUFFER*/: target = 0x8894 /*GL_ARRAY_BUFFER_BINDING*/; break;
        case 0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/: target = 0x8895 /*GL_ELEMENT_ARRAY_BUFFER_BINDING*/; break;
        case 0x88EB /*GL_PIXEL_PACK_BUFFER*/: target = 0x88ED /*GL_PIXEL_PACK_BUFFER_BINDING*/; break;
        case 0x88EC /*GL_PIXEL_UNPACK_BUFFER*/: target = 0x88EF /*GL_PIXEL_UNPACK_BUFFER_BINDING*/; break;
        case 0x8C8E /*GL_TRANSFORM_FEEDBACK_BUFFER*/: target = 0x8C8F /*GL_TRANSFORM_FEEDBACK_BUFFER_BINDING*/; break;
        case 0x8F36 /*GL_COPY_READ_BUFFER*/: target = 0x8F36 /*GL_COPY_READ_BUFFER_BINDING*/; break;
        case 0x8F37 /*GL_COPY_WRITE_BUFFER*/: target = 0x8F37 /*GL_COPY_WRITE_BUFFER_BINDING*/; break;
        case 0x8A11 /*GL_UNIFORM_BUFFER*/: target = 0x8A28 /*GL_UNIFORM_BUFFER_BINDING*/; break;
        // In default case, fall through and assume passed one of the _BINDING enums directly.
      }
      var buffer = GLctx.getParameter(target);
      if (buffer) return buffer.name|0;
      else return 0;
    }
  
  function emscriptenWebGLValidateMapBufferTarget(target) {
      switch (target) {
        case 0x8892: // GL_ARRAY_BUFFER
        case 0x8893: // GL_ELEMENT_ARRAY_BUFFER
        case 0x8F36: // GL_COPY_READ_BUFFER
        case 0x8F37: // GL_COPY_WRITE_BUFFER
        case 0x88EB: // GL_PIXEL_PACK_BUFFER
        case 0x88EC: // GL_PIXEL_UNPACK_BUFFER
        case 0x8C2A: // GL_TEXTURE_BUFFER
        case 0x8C8E: // GL_TRANSFORM_FEEDBACK_BUFFER
        case 0x8A11: // GL_UNIFORM_BUFFER
          return true;
        default:
          return false;
      }
    }
  
  function _emscripten_glFlushMappedBufferRange(target, offset, length) {
      if (!emscriptenWebGLValidateMapBufferTarget(target)) {
        GL.recordError(0x500/*GL_INVALID_ENUM*/);
        err('GL_INVALID_ENUM in glFlushMappedBufferRange');
        return;
      }
  
      var mapping = GL.mappedBuffers[emscriptenWebGLGetBufferBinding(target)];
      if (!mapping) {
        GL.recordError(0x502 /* GL_INVALID_OPERATION */);
        err('buffer was never mapped in glFlushMappedBufferRange');
        return;
      }
  
      if (!(mapping.access & 0x10)) {
        GL.recordError(0x502 /* GL_INVALID_OPERATION */);
        err('buffer was not mapped with GL_MAP_FLUSH_EXPLICIT_BIT in glFlushMappedBufferRange');
        return;
      }
      if (offset < 0 || length < 0 || offset + length > mapping.length) {
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        err('invalid range in glFlushMappedBufferRange');
        return;
      }
  
      GLctx.bufferSubData(
        target,
        mapping.offset,
        HEAPU8.subarray(mapping.mem + offset, mapping.mem + offset + length));
    }

  function _emscripten_glFramebufferRenderbuffer(target, attachment, renderbuffertarget, renderbuffer) {
      GLctx.framebufferRenderbuffer(target, attachment, renderbuffertarget,
                                         GL.renderbuffers[renderbuffer]);
    }

  function _emscripten_glFramebufferTexture2D(target, attachment, textarget, texture, level) {
      GLctx.framebufferTexture2D(target, attachment, textarget,
                                      GL.textures[texture], level);
    }

  function _emscripten_glFramebufferTextureLayer(target, attachment, texture, level, layer) {
      GLctx.framebufferTextureLayer(target, attachment, GL.textures[texture], level, layer);
    }

  function _emscripten_glFrontFace(x0) { GLctx['frontFace'](x0) }

  function __glGenObject(n, buffers, createFunction, objectTable
      ) {
      for (var i = 0; i < n; i++) {
        var buffer = GLctx[createFunction]();
        var id = buffer && GL.getNewId(objectTable);
        if (buffer) {
          buffer.name = id;
          objectTable[id] = buffer;
        } else {
          GL.recordError(0x502 /* GL_INVALID_OPERATION */);
        }
        HEAP32[(((buffers)+(i*4))>>2)] = id;
      }
    }
  
  function _emscripten_glGenBuffers(n, buffers) {
      __glGenObject(n, buffers, 'createBuffer', GL.buffers
        );
    }

  
  function _emscripten_glGenFramebuffers(n, ids) {
      __glGenObject(n, ids, 'createFramebuffer', GL.framebuffers
        );
    }

  function _emscripten_glGenQueries(n, ids) {
      __glGenObject(n, ids, 'createQuery', GL.queries
        );
    }

  function _emscripten_glGenQueriesEXT(n, ids) {
      for (var i = 0; i < n; i++) {
        var query = GLctx.disjointTimerQueryExt['createQueryEXT']();
        if (!query) {
          GL.recordError(0x502 /* GL_INVALID_OPERATION */);
          while (i < n) HEAP32[(((ids)+(i++*4))>>2)] = 0;
          return;
        }
        var id = GL.getNewId(GL.queries);
        query.name = id;
        GL.queries[id] = query;
        HEAP32[(((ids)+(i*4))>>2)] = id;
      }
    }

  
  function _emscripten_glGenRenderbuffers(n, renderbuffers) {
      __glGenObject(n, renderbuffers, 'createRenderbuffer', GL.renderbuffers
        );
    }

  function _emscripten_glGenSamplers(n, samplers) {
      __glGenObject(n, samplers, 'createSampler', GL.samplers
        );
    }

  
  function _emscripten_glGenTextures(n, textures) {
      __glGenObject(n, textures, 'createTexture', GL.textures
        );
    }

  function _emscripten_glGenTransformFeedbacks(n, ids) {
      __glGenObject(n, ids, 'createTransformFeedback', GL.transformFeedbacks
        );
    }

  
  function _emscripten_glGenVertexArrays(n, arrays) {
      __glGenObject(n, arrays, 'createVertexArray', GL.vaos
        );
    }

  
  function _emscripten_glGenVertexArraysOES(n, arrays) {
      __glGenObject(n, arrays, 'createVertexArray', GL.vaos
        );
    }

  function _emscripten_glGenerateMipmap(x0) { GLctx['generateMipmap'](x0) }

  function __glGetActiveAttribOrUniform(funcName, program, index, bufSize, length, size, type, name) {
      program = GL.programs[program];
      var info = GLctx[funcName](program, index);
      if (info) { // If an error occurs, nothing will be written to length, size and type and name.
        var numBytesWrittenExclNull = name && stringToUTF8(info.name, name, bufSize);
        if (length) HEAP32[((length)>>2)] = numBytesWrittenExclNull;
        if (size) HEAP32[((size)>>2)] = info.size;
        if (type) HEAP32[((type)>>2)] = info.type;
      }
    }
  
  function _emscripten_glGetActiveAttrib(program, index, bufSize, length, size, type, name) {
      __glGetActiveAttribOrUniform('getActiveAttrib', program, index, bufSize, length, size, type, name);
    }

  
  function _emscripten_glGetActiveUniform(program, index, bufSize, length, size, type, name) {
      __glGetActiveAttribOrUniform('getActiveUniform', program, index, bufSize, length, size, type, name);
    }

  function _emscripten_glGetActiveUniformBlockName(program, uniformBlockIndex, bufSize, length, uniformBlockName) {
      program = GL.programs[program];
  
      var result = GLctx['getActiveUniformBlockName'](program, uniformBlockIndex);
      if (!result) return; // If an error occurs, nothing will be written to uniformBlockName or length.
      if (uniformBlockName && bufSize > 0) {
        var numBytesWrittenExclNull = stringToUTF8(result, uniformBlockName, bufSize);
        if (length) HEAP32[((length)>>2)] = numBytesWrittenExclNull;
      } else {
        if (length) HEAP32[((length)>>2)] = 0;
      }
    }

  function _emscripten_glGetActiveUniformBlockiv(program, uniformBlockIndex, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if params == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      program = GL.programs[program];
  
      if (pname == 0x8A41 /* GL_UNIFORM_BLOCK_NAME_LENGTH */) {
        var name = GLctx['getActiveUniformBlockName'](program, uniformBlockIndex);
        HEAP32[((params)>>2)] = name.length+1;
        return;
      }
  
      var result = GLctx['getActiveUniformBlockParameter'](program, uniformBlockIndex, pname);
      if (result === null) return; // If an error occurs, nothing should be written to params.
      if (pname == 0x8A43 /*GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES*/) {
        for (var i = 0; i < result.length; i++) {
          HEAP32[(((params)+(i*4))>>2)] = result[i];
        }
      } else {
        HEAP32[((params)>>2)] = result;
      }
    }

  function _emscripten_glGetActiveUniformsiv(program, uniformCount, uniformIndices, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if params == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      if (uniformCount > 0 && uniformIndices == 0) {
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      program = GL.programs[program];
      var ids = [];
      for (var i = 0; i < uniformCount; i++) {
        ids.push(HEAP32[(((uniformIndices)+(i*4))>>2)]);
      }
  
      var result = GLctx['getActiveUniforms'](program, ids, pname);
      if (!result) return; // GL spec: If an error is generated, nothing is written out to params.
  
      var len = result.length;
      for (var i = 0; i < len; i++) {
        HEAP32[(((params)+(i*4))>>2)] = result[i];
      }
    }

  function _emscripten_glGetAttachedShaders(program, maxCount, count, shaders) {
      var result = GLctx.getAttachedShaders(GL.programs[program]);
      var len = result.length;
      if (len > maxCount) {
        len = maxCount;
      }
      HEAP32[((count)>>2)] = len;
      for (var i = 0; i < len; ++i) {
        var id = GL.shaders.indexOf(result[i]);
        HEAP32[(((shaders)+(i*4))>>2)] = id;
      }
    }

  function _emscripten_glGetAttribLocation(program, name) {
      return GLctx.getAttribLocation(GL.programs[program], UTF8ToString(name));
    }

  function readI53FromI64(ptr) {
      return HEAPU32[ptr>>2] + HEAP32[ptr+4>>2] * 4294967296;
    }
  
  function readI53FromU64(ptr) {
      return HEAPU32[ptr>>2] + HEAPU32[ptr+4>>2] * 4294967296;
    }
  function writeI53ToI64(ptr, num) {
      HEAPU32[ptr>>2] = num;
      HEAPU32[ptr+4>>2] = (num - HEAPU32[ptr>>2])/4294967296;
      var deserialized = (num >= 0) ? readI53FromU64(ptr) : readI53FromI64(ptr);
      if (deserialized != num) warnOnce('writeI53ToI64() out of range: serialized JS Number ' + num + ' to Wasm heap as bytes lo=' + ptrToString(HEAPU32[ptr>>2]) + ', hi=' + ptrToString(HEAPU32[ptr+4>>2]) + ', which deserializes back to ' + deserialized + ' instead!');
    }
  
  function emscriptenWebGLGet(name_, p, type) {
      // Guard against user passing a null pointer.
      // Note that GLES2 spec does not say anything about how passing a null pointer should be treated.
      // Testing on desktop core GL 3, the application crashes on glGetIntegerv to a null pointer, but
      // better to report an error instead of doing anything random.
      if (!p) {
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var ret = undefined;
      switch (name_) { // Handle a few trivial GLES values
        case 0x8DFA: // GL_SHADER_COMPILER
          ret = 1;
          break;
        case 0x8DF8: // GL_SHADER_BINARY_FORMATS
          if (type != 0 && type != 1) {
            GL.recordError(0x500); // GL_INVALID_ENUM
          }
          return; // Do not write anything to the out pointer, since no binary formats are supported.
        case 0x87FE: // GL_NUM_PROGRAM_BINARY_FORMATS
        case 0x8DF9: // GL_NUM_SHADER_BINARY_FORMATS
          ret = 0;
          break;
        case 0x86A2: // GL_NUM_COMPRESSED_TEXTURE_FORMATS
          // WebGL doesn't have GL_NUM_COMPRESSED_TEXTURE_FORMATS (it's obsolete since GL_COMPRESSED_TEXTURE_FORMATS returns a JS array that can be queried for length),
          // so implement it ourselves to allow C++ GLES2 code get the length.
          var formats = GLctx.getParameter(0x86A3 /*GL_COMPRESSED_TEXTURE_FORMATS*/);
          ret = formats ? formats.length : 0;
          break;
  
        case 0x821D: // GL_NUM_EXTENSIONS
          if (GL.currentContext.version < 2) {
            GL.recordError(0x502 /* GL_INVALID_OPERATION */); // Calling GLES3/WebGL2 function with a GLES2/WebGL1 context
            return;
          }
          // .getSupportedExtensions() can return null if context is lost, so coerce to empty array.
          var exts = GLctx.getSupportedExtensions() || [];
          ret = 2 * exts.length; // each extension is duplicated, first in unprefixed WebGL form, and then a second time with "GL_" prefix.
          break;
        case 0x821B: // GL_MAJOR_VERSION
        case 0x821C: // GL_MINOR_VERSION
          if (GL.currentContext.version < 2) {
            GL.recordError(0x500); // GL_INVALID_ENUM
            return;
          }
          ret = name_ == 0x821B ? 3 : 0; // return version 3.0
          break;
      }
  
      if (ret === undefined) {
        var result = GLctx.getParameter(name_);
        switch (typeof result) {
          case "number":
            ret = result;
            break;
          case "boolean":
            ret = result ? 1 : 0;
            break;
          case "string":
            GL.recordError(0x500); // GL_INVALID_ENUM
            return;
          case "object":
            if (result === null) {
              // null is a valid result for some (e.g., which buffer is bound - perhaps nothing is bound), but otherwise
              // can mean an invalid name_, which we need to report as an error
              switch (name_) {
                case 0x8894: // ARRAY_BUFFER_BINDING
                case 0x8B8D: // CURRENT_PROGRAM
                case 0x8895: // ELEMENT_ARRAY_BUFFER_BINDING
                case 0x8CA6: // FRAMEBUFFER_BINDING or DRAW_FRAMEBUFFER_BINDING
                case 0x8CA7: // RENDERBUFFER_BINDING
                case 0x8069: // TEXTURE_BINDING_2D
                case 0x85B5: // WebGL 2 GL_VERTEX_ARRAY_BINDING, or WebGL 1 extension OES_vertex_array_object GL_VERTEX_ARRAY_BINDING_OES
                case 0x8F36: // COPY_READ_BUFFER_BINDING or COPY_READ_BUFFER
                case 0x8F37: // COPY_WRITE_BUFFER_BINDING or COPY_WRITE_BUFFER
                case 0x88ED: // PIXEL_PACK_BUFFER_BINDING
                case 0x88EF: // PIXEL_UNPACK_BUFFER_BINDING
                case 0x8CAA: // READ_FRAMEBUFFER_BINDING
                case 0x8919: // SAMPLER_BINDING
                case 0x8C1D: // TEXTURE_BINDING_2D_ARRAY
                case 0x806A: // TEXTURE_BINDING_3D
                case 0x8E25: // TRANSFORM_FEEDBACK_BINDING
                case 0x8C8F: // TRANSFORM_FEEDBACK_BUFFER_BINDING
                case 0x8A28: // UNIFORM_BUFFER_BINDING
                case 0x8514: { // TEXTURE_BINDING_CUBE_MAP
                  ret = 0;
                  break;
                }
                default: {
                  GL.recordError(0x500); // GL_INVALID_ENUM
                  return;
                }
              }
            } else if (result instanceof Float32Array ||
                       result instanceof Uint32Array ||
                       result instanceof Int32Array ||
                       result instanceof Array) {
              for (var i = 0; i < result.length; ++i) {
                switch (type) {
                  case 0: HEAP32[(((p)+(i*4))>>2)] = result[i]; break;
                  case 2: HEAPF32[(((p)+(i*4))>>2)] = result[i]; break;
                  case 4: HEAP8[(((p)+(i))>>0)] = result[i] ? 1 : 0; break;
                }
              }
              return;
            } else {
              try {
                ret = result.name | 0;
              } catch(e) {
                GL.recordError(0x500); // GL_INVALID_ENUM
                err('GL_INVALID_ENUM in glGet' + type + 'v: Unknown object returned from WebGL getParameter(' + name_ + ')! (error: ' + e + ')');
                return;
              }
            }
            break;
          default:
            GL.recordError(0x500); // GL_INVALID_ENUM
            err('GL_INVALID_ENUM in glGet' + type + 'v: Native code calling glGet' + type + 'v(' + name_ + ') and it returns ' + result + ' of type ' + typeof(result) + '!');
            return;
        }
      }
  
      switch (type) {
        case 1: writeI53ToI64(p, ret); break;
        case 0: HEAP32[((p)>>2)] = ret; break;
        case 2:   HEAPF32[((p)>>2)] = ret; break;
        case 4: HEAP8[((p)>>0)] = ret ? 1 : 0; break;
      }
    }
  
  function _emscripten_glGetBooleanv(name_, p) {
      emscriptenWebGLGet(name_, p, 4);
    }

  function _emscripten_glGetBufferParameteri64v(target, value, data) {
      if (!data) {
        // GLES2 specification does not specify how to behave if data is a null pointer. Since calling this function does not make sense
        // if data == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      writeI53ToI64(data, GLctx.getBufferParameter(target, value));
    }

  function _emscripten_glGetBufferParameteriv(target, value, data) {
      if (!data) {
        // GLES2 specification does not specify how to behave if data is a null pointer. Since calling this function does not make sense
        // if data == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      HEAP32[((data)>>2)] = GLctx.getBufferParameter(target, value);
    }

  
  function _emscripten_glGetBufferPointerv(target, pname, params) {
      if (pname == 0x88BD/*GL_BUFFER_MAP_POINTER*/) {
        var ptr = 0;
        var mappedBuffer = GL.mappedBuffers[emscriptenWebGLGetBufferBinding(target)];
        if (mappedBuffer) {
          ptr = mappedBuffer.mem;
        }
        HEAP32[((params)>>2)] = ptr;
      } else {
        GL.recordError(0x500/*GL_INVALID_ENUM*/);
        err('GL_INVALID_ENUM in glGetBufferPointerv');
      }
    }

  function _emscripten_glGetError() {
      var error = GLctx.getError() || GL.lastError;
      GL.lastError = 0/*GL_NO_ERROR*/;
      return error;
    }

  
  function _emscripten_glGetFloatv(name_, p) {
      emscriptenWebGLGet(name_, p, 2);
    }

  function _emscripten_glGetFragDataLocation(program, name) {
      return GLctx['getFragDataLocation'](GL.programs[program], UTF8ToString(name));
    }

  function _emscripten_glGetFramebufferAttachmentParameteriv(target, attachment, pname, params) {
      var result = GLctx.getFramebufferAttachmentParameter(target, attachment, pname);
      if (result instanceof WebGLRenderbuffer ||
          result instanceof WebGLTexture) {
        result = result.name | 0;
      }
      HEAP32[((params)>>2)] = result;
    }

  function emscriptenWebGLGetIndexed(target, index, data, type) {
      if (!data) {
        // GLES2 specification does not specify how to behave if data is a null pointer. Since calling this function does not make sense
        // if data == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var result = GLctx['getIndexedParameter'](target, index);
      var ret;
      switch (typeof result) {
        case 'boolean':
          ret = result ? 1 : 0;
          break;
        case 'number':
          ret = result;
          break;
        case 'object':
          if (result === null) {
            switch (target) {
              case 0x8C8F: // TRANSFORM_FEEDBACK_BUFFER_BINDING
              case 0x8A28: // UNIFORM_BUFFER_BINDING
                ret = 0;
                break;
              default: {
                GL.recordError(0x500); // GL_INVALID_ENUM
                return;
              }
            }
          } else if (result instanceof WebGLBuffer) {
            ret = result.name | 0;
          } else {
            GL.recordError(0x500); // GL_INVALID_ENUM
            return;
          }
          break;
        default:
          GL.recordError(0x500); // GL_INVALID_ENUM
          return;
      }
  
      switch (type) {
        case 1: writeI53ToI64(data, ret); break;
        case 0: HEAP32[((data)>>2)] = ret; break;
        case 2: HEAPF32[((data)>>2)] = ret; break;
        case 4: HEAP8[((data)>>0)] = ret ? 1 : 0; break;
        default: throw 'internal emscriptenWebGLGetIndexed() error, bad type: ' + type;
      }
    }
  function _emscripten_glGetInteger64i_v(target, index, data) {
      emscriptenWebGLGetIndexed(target, index, data, 1);
    }

  function _emscripten_glGetInteger64v(name_, p) {
      emscriptenWebGLGet(name_, p, 1);
    }

  function _emscripten_glGetIntegeri_v(target, index, data) {
      emscriptenWebGLGetIndexed(target, index, data, 0);
    }

  
  function _emscripten_glGetIntegerv(name_, p) {
      emscriptenWebGLGet(name_, p, 0);
    }

  function _emscripten_glGetInternalformativ(target, internalformat, pname, bufSize, params) {
      if (bufSize < 0) {
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      if (!params) {
        // GLES3 specification does not specify how to behave if values is a null pointer. Since calling this function does not make sense
        // if values == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var ret = GLctx['getInternalformatParameter'](target, internalformat, pname);
      if (ret === null) return;
      for (var i = 0; i < ret.length && i < bufSize; ++i) {
        HEAP32[(((params)+(i*4))>>2)] = ret[i];
      }
    }

  function _emscripten_glGetProgramBinary(program, bufSize, length, binaryFormat, binary) {
      GL.recordError(0x502/*GL_INVALID_OPERATION*/);
    }

  function _emscripten_glGetProgramInfoLog(program, maxLength, length, infoLog) {
      var log = GLctx.getProgramInfoLog(GL.programs[program]);
      if (log === null) log = '(unknown error)';
      var numBytesWrittenExclNull = (maxLength > 0 && infoLog) ? stringToUTF8(log, infoLog, maxLength) : 0;
      if (length) HEAP32[((length)>>2)] = numBytesWrittenExclNull;
    }

  function _emscripten_glGetProgramiv(program, pname, p) {
      if (!p) {
        // GLES2 specification does not specify how to behave if p is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
  
      if (program >= GL.counter) {
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
  
      program = GL.programs[program];
  
      if (pname == 0x8B84) { // GL_INFO_LOG_LENGTH
        var log = GLctx.getProgramInfoLog(program);
        if (log === null) log = '(unknown error)';
        HEAP32[((p)>>2)] = log.length + 1;
      } else if (pname == 0x8B87 /* GL_ACTIVE_UNIFORM_MAX_LENGTH */) {
        if (!program.maxUniformLength) {
          for (var i = 0; i < GLctx.getProgramParameter(program, 0x8B86/*GL_ACTIVE_UNIFORMS*/); ++i) {
            program.maxUniformLength = Math.max(program.maxUniformLength, GLctx.getActiveUniform(program, i).name.length+1);
          }
        }
        HEAP32[((p)>>2)] = program.maxUniformLength;
      } else if (pname == 0x8B8A /* GL_ACTIVE_ATTRIBUTE_MAX_LENGTH */) {
        if (!program.maxAttributeLength) {
          for (var i = 0; i < GLctx.getProgramParameter(program, 0x8B89/*GL_ACTIVE_ATTRIBUTES*/); ++i) {
            program.maxAttributeLength = Math.max(program.maxAttributeLength, GLctx.getActiveAttrib(program, i).name.length+1);
          }
        }
        HEAP32[((p)>>2)] = program.maxAttributeLength;
      } else if (pname == 0x8A35 /* GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH */) {
        if (!program.maxUniformBlockNameLength) {
          for (var i = 0; i < GLctx.getProgramParameter(program, 0x8A36/*GL_ACTIVE_UNIFORM_BLOCKS*/); ++i) {
            program.maxUniformBlockNameLength = Math.max(program.maxUniformBlockNameLength, GLctx.getActiveUniformBlockName(program, i).length+1);
          }
        }
        HEAP32[((p)>>2)] = program.maxUniformBlockNameLength;
      } else {
        HEAP32[((p)>>2)] = GLctx.getProgramParameter(program, pname);
      }
    }

  
  function _emscripten_glGetQueryObjecti64vEXT(id, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var query = GL.queries[id];
      var param;
      if (GL.currentContext.version < 2)
      {
        param = GLctx.disjointTimerQueryExt['getQueryObjectEXT'](query, pname);
      }
      else {
        param = GLctx['getQueryParameter'](query, pname);
      }
      var ret;
      if (typeof param == 'boolean') {
        ret = param ? 1 : 0;
      } else {
        ret = param;
      }
      writeI53ToI64(params, ret);
    }

  function _emscripten_glGetQueryObjectivEXT(id, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var query = GL.queries[id];
      var param = GLctx.disjointTimerQueryExt['getQueryObjectEXT'](query, pname);
      var ret;
      if (typeof param == 'boolean') {
        ret = param ? 1 : 0;
      } else {
        ret = param;
      }
      HEAP32[((params)>>2)] = ret;
    }

  
  function _emscripten_glGetQueryObjectui64vEXT(id, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var query = GL.queries[id];
      var param;
      if (GL.currentContext.version < 2)
      {
        param = GLctx.disjointTimerQueryExt['getQueryObjectEXT'](query, pname);
      }
      else {
        param = GLctx['getQueryParameter'](query, pname);
      }
      var ret;
      if (typeof param == 'boolean') {
        ret = param ? 1 : 0;
      } else {
        ret = param;
      }
      writeI53ToI64(params, ret);
    }

  function _emscripten_glGetQueryObjectuiv(id, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var query = GL.queries[id];
      var param = GLctx['getQueryParameter'](query, pname);
      var ret;
      if (typeof param == 'boolean') {
        ret = param ? 1 : 0;
      } else {
        ret = param;
      }
      HEAP32[((params)>>2)] = ret;
    }

  function _emscripten_glGetQueryObjectuivEXT(id, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var query = GL.queries[id];
      var param = GLctx.disjointTimerQueryExt['getQueryObjectEXT'](query, pname);
      var ret;
      if (typeof param == 'boolean') {
        ret = param ? 1 : 0;
      } else {
        ret = param;
      }
      HEAP32[((params)>>2)] = ret;
    }

  function _emscripten_glGetQueryiv(target, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      HEAP32[((params)>>2)] = GLctx['getQuery'](target, pname);
    }

  function _emscripten_glGetQueryivEXT(target, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      HEAP32[((params)>>2)] = GLctx.disjointTimerQueryExt['getQueryEXT'](target, pname);
    }

  function _emscripten_glGetRenderbufferParameteriv(target, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if params == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      HEAP32[((params)>>2)] = GLctx.getRenderbufferParameter(target, pname);
    }

  function _emscripten_glGetSamplerParameterfv(sampler, pname, params) {
      if (!params) {
        // GLES3 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      HEAPF32[((params)>>2)] = GLctx['getSamplerParameter'](GL.samplers[sampler], pname);
    }

  function _emscripten_glGetSamplerParameteriv(sampler, pname, params) {
      if (!params) {
        // GLES3 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      HEAP32[((params)>>2)] = GLctx['getSamplerParameter'](GL.samplers[sampler], pname);
    }

  function _emscripten_glGetShaderInfoLog(shader, maxLength, length, infoLog) {
      var log = GLctx.getShaderInfoLog(GL.shaders[shader]);
      if (log === null) log = '(unknown error)';
      var numBytesWrittenExclNull = (maxLength > 0 && infoLog) ? stringToUTF8(log, infoLog, maxLength) : 0;
      if (length) HEAP32[((length)>>2)] = numBytesWrittenExclNull;
    }

  function _emscripten_glGetShaderPrecisionFormat(shaderType, precisionType, range, precision) {
      var result = GLctx.getShaderPrecisionFormat(shaderType, precisionType);
      HEAP32[((range)>>2)] = result.rangeMin;
      HEAP32[(((range)+(4))>>2)] = result.rangeMax;
      HEAP32[((precision)>>2)] = result.precision;
    }

  function _emscripten_glGetShaderSource(shader, bufSize, length, source) {
      var result = GLctx.getShaderSource(GL.shaders[shader]);
      if (!result) return; // If an error occurs, nothing will be written to length or source.
      var numBytesWrittenExclNull = (bufSize > 0 && source) ? stringToUTF8(result, source, bufSize) : 0;
      if (length) HEAP32[((length)>>2)] = numBytesWrittenExclNull;
    }

  function _emscripten_glGetShaderiv(shader, pname, p) {
      if (!p) {
        // GLES2 specification does not specify how to behave if p is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      if (pname == 0x8B84) { // GL_INFO_LOG_LENGTH
        var log = GLctx.getShaderInfoLog(GL.shaders[shader]);
        if (log === null) log = '(unknown error)';
        // The GLES2 specification says that if the shader has an empty info log,
        // a value of 0 is returned. Otherwise the log has a null char appended.
        // (An empty string is falsey, so we can just check that instead of
        // looking at log.length.)
        var logLength = log ? log.length + 1 : 0;
        HEAP32[((p)>>2)] = logLength;
      } else if (pname == 0x8B88) { // GL_SHADER_SOURCE_LENGTH
        var source = GLctx.getShaderSource(GL.shaders[shader]);
        // source may be a null, or the empty string, both of which are falsey
        // values that we report a 0 length for.
        var sourceLength = source ? source.length + 1 : 0;
        HEAP32[((p)>>2)] = sourceLength;
      } else {
        HEAP32[((p)>>2)] = GLctx.getShaderParameter(GL.shaders[shader], pname);
      }
    }

  function stringToNewUTF8(jsString) {
      var length = lengthBytesUTF8(jsString)+1;
      var cString = _malloc(length);
      stringToUTF8(jsString, cString, length);
      return cString;
    }
  
  function _emscripten_glGetString(name_) {
      var ret = GL.stringCache[name_];
      if (!ret) {
        switch (name_) {
          case 0x1F03 /* GL_EXTENSIONS */:
            var exts = GLctx.getSupportedExtensions() || []; // .getSupportedExtensions() can return null if context is lost, so coerce to empty array.
            exts = exts.concat(exts.map(function(e) { return "GL_" + e; }));
            ret = stringToNewUTF8(exts.join(' '));
            break;
          case 0x1F00 /* GL_VENDOR */:
          case 0x1F01 /* GL_RENDERER */:
          case 0x9245 /* UNMASKED_VENDOR_WEBGL */:
          case 0x9246 /* UNMASKED_RENDERER_WEBGL */:
            var s = GLctx.getParameter(name_);
            if (!s) {
              GL.recordError(0x500/*GL_INVALID_ENUM*/);
            }
            ret = s && stringToNewUTF8(s);
            break;
  
          case 0x1F02 /* GL_VERSION */:
            var glVersion = GLctx.getParameter(0x1F02 /*GL_VERSION*/);
            // return GLES version string corresponding to the version of the WebGL context
            if (true) glVersion = 'OpenGL ES 3.0 (' + glVersion + ')';
            else
            {
              glVersion = 'OpenGL ES 2.0 (' + glVersion + ')';
            }
            ret = stringToNewUTF8(glVersion);
            break;
          case 0x8B8C /* GL_SHADING_LANGUAGE_VERSION */:
            var glslVersion = GLctx.getParameter(0x8B8C /*GL_SHADING_LANGUAGE_VERSION*/);
            // extract the version number 'N.M' from the string 'WebGL GLSL ES N.M ...'
            var ver_re = /^WebGL GLSL ES ([0-9]\.[0-9][0-9]?)(?:$| .*)/;
            var ver_num = glslVersion.match(ver_re);
            if (ver_num !== null) {
              if (ver_num[1].length == 3) ver_num[1] = ver_num[1] + '0'; // ensure minor version has 2 digits
              glslVersion = 'OpenGL ES GLSL ES ' + ver_num[1] + ' (' + glslVersion + ')';
            }
            ret = stringToNewUTF8(glslVersion);
            break;
          default:
            GL.recordError(0x500/*GL_INVALID_ENUM*/);
            // fall through
        }
        GL.stringCache[name_] = ret;
      }
      return ret;
    }

  function _emscripten_glGetStringi(name, index) {
      if (GL.currentContext.version < 2) {
        GL.recordError(0x502 /* GL_INVALID_OPERATION */); // Calling GLES3/WebGL2 function with a GLES2/WebGL1 context
        return 0;
      }
      var stringiCache = GL.stringiCache[name];
      if (stringiCache) {
        if (index < 0 || index >= stringiCache.length) {
          GL.recordError(0x501/*GL_INVALID_VALUE*/);
          return 0;
        }
        return stringiCache[index];
      }
      switch (name) {
        case 0x1F03 /* GL_EXTENSIONS */:
          var exts = GLctx.getSupportedExtensions() || []; // .getSupportedExtensions() can return null if context is lost, so coerce to empty array.
          exts = exts.concat(exts.map(function(e) { return "GL_" + e; }));
          exts = exts.map(function(e) { return stringToNewUTF8(e); });
  
          stringiCache = GL.stringiCache[name] = exts;
          if (index < 0 || index >= stringiCache.length) {
            GL.recordError(0x501/*GL_INVALID_VALUE*/);
            return 0;
          }
          return stringiCache[index];
        default:
          GL.recordError(0x500/*GL_INVALID_ENUM*/);
          return 0;
      }
    }

  function _emscripten_glGetSynciv(sync, pname, bufSize, length, values) {
      if (bufSize < 0) {
        // GLES3 specification does not specify how to behave if bufSize < 0, however in the spec wording for glGetInternalformativ, it does say that GL_INVALID_VALUE should be raised,
        // so raise GL_INVALID_VALUE here as well.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      if (!values) {
        // GLES3 specification does not specify how to behave if values is a null pointer. Since calling this function does not make sense
        // if values == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      var ret = GLctx.getSyncParameter(GL.syncs[sync], pname);
      if (ret !== null) {
        HEAP32[((values)>>2)] = ret;
        if (length) HEAP32[((length)>>2)] = 1; // Report a single value outputted.
      }
    }

  function _emscripten_glGetTexParameterfv(target, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      HEAPF32[((params)>>2)] = GLctx.getTexParameter(target, pname);
    }

  function _emscripten_glGetTexParameteriv(target, pname, params) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if p == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      HEAP32[((params)>>2)] = GLctx.getTexParameter(target, pname);
    }

  function _emscripten_glGetTransformFeedbackVarying(program, index, bufSize, length, size, type, name) {
      program = GL.programs[program];
      var info = GLctx['getTransformFeedbackVarying'](program, index);
      if (!info) return; // If an error occurred, the return parameters length, size, type and name will be unmodified.
  
      if (name && bufSize > 0) {
        var numBytesWrittenExclNull = stringToUTF8(info.name, name, bufSize);
        if (length) HEAP32[((length)>>2)] = numBytesWrittenExclNull;
      } else {
        if (length) HEAP32[((length)>>2)] = 0;
      }
  
      if (size) HEAP32[((size)>>2)] = info.size;
      if (type) HEAP32[((type)>>2)] = info.type;
    }

  function _emscripten_glGetUniformBlockIndex(program, uniformBlockName) {
      return GLctx['getUniformBlockIndex'](GL.programs[program], UTF8ToString(uniformBlockName));
    }

  function _emscripten_glGetUniformIndices(program, uniformCount, uniformNames, uniformIndices) {
      if (!uniformIndices) {
        // GLES2 specification does not specify how to behave if uniformIndices is a null pointer. Since calling this function does not make sense
        // if uniformIndices == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      if (uniformCount > 0 && (uniformNames == 0 || uniformIndices == 0)) {
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      program = GL.programs[program];
      var names = [];
      for (var i = 0; i < uniformCount; i++)
        names.push(UTF8ToString(HEAP32[(((uniformNames)+(i*4))>>2)]));
  
      var result = GLctx['getUniformIndices'](program, names);
      if (!result) return; // GL spec: If an error is generated, nothing is written out to uniformIndices.
  
      var len = result.length;
      for (var i = 0; i < len; i++) {
        HEAP32[(((uniformIndices)+(i*4))>>2)] = result[i];
      }
    }

  
  /** @noinline */
  function webglGetLeftBracePos(name) {
      return name.slice(-1) == ']' && name.lastIndexOf('[');
    }
  
  function webglPrepareUniformLocationsBeforeFirstUse(program) {
      var uniformLocsById = program.uniformLocsById, // Maps GLuint -> WebGLUniformLocation
        uniformSizeAndIdsByName = program.uniformSizeAndIdsByName, // Maps name -> [uniform array length, GLuint]
        i, j;
  
      // On the first time invocation of glGetUniformLocation on this shader program:
      // initialize cache data structures and discover which uniforms are arrays.
      if (!uniformLocsById) {
        // maps GLint integer locations to WebGLUniformLocations
        program.uniformLocsById = uniformLocsById = {};
        // maps integer locations back to uniform name strings, so that we can lazily fetch uniform array locations
        program.uniformArrayNamesById = {};
  
        for (i = 0; i < GLctx.getProgramParameter(program, 0x8B86/*GL_ACTIVE_UNIFORMS*/); ++i) {
          var u = GLctx.getActiveUniform(program, i);
          var nm = u.name;
          var sz = u.size;
          var lb = webglGetLeftBracePos(nm);
          var arrayName = lb > 0 ? nm.slice(0, lb) : nm;
  
          // Assign a new location.
          var id = program.uniformIdCounter;
          program.uniformIdCounter += sz;
          // Eagerly get the location of the uniformArray[0] base element.
          // The remaining indices >0 will be left for lazy evaluation to
          // improve performance. Those may never be needed to fetch, if the
          // application fills arrays always in full starting from the first
          // element of the array.
          uniformSizeAndIdsByName[arrayName] = [sz, id];
  
          // Store placeholder integers in place that highlight that these
          // >0 index locations are array indices pending population.
          for(j = 0; j < sz; ++j) {
            uniformLocsById[id] = j;
            program.uniformArrayNamesById[id++] = arrayName;
          }
        }
      }
    }
  
  
  function _emscripten_glGetUniformLocation(program, name) {
  
      name = UTF8ToString(name);
  
      if (program = GL.programs[program]) {
        webglPrepareUniformLocationsBeforeFirstUse(program);
        var uniformLocsById = program.uniformLocsById; // Maps GLuint -> WebGLUniformLocation
        var arrayIndex = 0;
        var uniformBaseName = name;
  
        // Invariant: when populating integer IDs for uniform locations, we must maintain the precondition that
        // arrays reside in contiguous addresses, i.e. for a 'vec4 colors[10];', colors[4] must be at location colors[0]+4.
        // However, user might call glGetUniformLocation(program, "colors") for an array, so we cannot discover based on the user
        // input arguments whether the uniform we are dealing with is an array. The only way to discover which uniforms are arrays
        // is to enumerate over all the active uniforms in the program.
        var leftBrace = webglGetLeftBracePos(name);
  
        // If user passed an array accessor "[index]", parse the array index off the accessor.
        if (leftBrace > 0) {
          arrayIndex = jstoi_q(name.slice(leftBrace + 1)) >>> 0; // "index]", coerce parseInt(']') with >>>0 to treat "foo[]" as "foo[0]" and foo[-1] as unsigned out-of-bounds.
          uniformBaseName = name.slice(0, leftBrace);
        }
  
        // Have we cached the location of this uniform before?
        var sizeAndId = program.uniformSizeAndIdsByName[uniformBaseName]; // A pair [array length, GLint of the uniform location]
  
        // If an uniform with this name exists, and if its index is within the array limits (if it's even an array),
        // query the WebGLlocation, or return an existing cached location.
        if (sizeAndId && arrayIndex < sizeAndId[0]) {
          arrayIndex += sizeAndId[1]; // Add the base location of the uniform to the array index offset.
          if ((uniformLocsById[arrayIndex] = uniformLocsById[arrayIndex] || GLctx.getUniformLocation(program, name))) {
            return arrayIndex;
          }
        }
      }
      else {
        // N.b. we are currently unable to distinguish between GL program IDs that never existed vs GL program IDs that have been deleted,
        // so report GL_INVALID_VALUE in both cases.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
      }
      return -1;
    }

  function webglGetUniformLocation(location) {
      var p = GLctx.currentProgram;
  
      if (p) {
        var webglLoc = p.uniformLocsById[location];
        // p.uniformLocsById[location] stores either an integer, or a WebGLUniformLocation.
  
        // If an integer, we have not yet bound the location, so do it now. The integer value specifies the array index
        // we should bind to.
        if (typeof webglLoc == 'number') {
          p.uniformLocsById[location] = webglLoc = GLctx.getUniformLocation(p, p.uniformArrayNamesById[location] + (webglLoc > 0 ? '[' + webglLoc + ']' : ''));
        }
        // Else an already cached WebGLUniformLocation, return it.
        return webglLoc;
      } else {
        GL.recordError(0x502/*GL_INVALID_OPERATION*/);
      }
    }
  
  
  /** @suppress{checkTypes} */
  function emscriptenWebGLGetUniform(program, location, params, type) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if params == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      program = GL.programs[program];
      webglPrepareUniformLocationsBeforeFirstUse(program);
      var data = GLctx.getUniform(program, webglGetUniformLocation(location));
      if (typeof data == 'number' || typeof data == 'boolean') {
        switch (type) {
          case 0: HEAP32[((params)>>2)] = data; break;
          case 2: HEAPF32[((params)>>2)] = data; break;
        }
      } else {
        for (var i = 0; i < data.length; i++) {
          switch (type) {
            case 0: HEAP32[(((params)+(i*4))>>2)] = data[i]; break;
            case 2: HEAPF32[(((params)+(i*4))>>2)] = data[i]; break;
          }
        }
      }
    }
  
  function _emscripten_glGetUniformfv(program, location, params) {
      emscriptenWebGLGetUniform(program, location, params, 2);
    }

  
  function _emscripten_glGetUniformiv(program, location, params) {
      emscriptenWebGLGetUniform(program, location, params, 0);
    }

  function _emscripten_glGetUniformuiv(program, location, params) {
      emscriptenWebGLGetUniform(program, location, params, 0);
    }

  /** @suppress{checkTypes} */
  function emscriptenWebGLGetVertexAttrib(index, pname, params, type) {
      if (!params) {
        // GLES2 specification does not specify how to behave if params is a null pointer. Since calling this function does not make sense
        // if params == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      if (GL.currentContext.clientBuffers[index].enabled) {
        err("glGetVertexAttrib*v on client-side array: not supported, bad data returned");
      }
      var data = GLctx.getVertexAttrib(index, pname);
      if (pname == 0x889F/*VERTEX_ATTRIB_ARRAY_BUFFER_BINDING*/) {
        HEAP32[((params)>>2)] = data && data["name"];
      } else if (typeof data == 'number' || typeof data == 'boolean') {
        switch (type) {
          case 0: HEAP32[((params)>>2)] = data; break;
          case 2: HEAPF32[((params)>>2)] = data; break;
          case 5: HEAP32[((params)>>2)] = Math.fround(data); break;
        }
      } else {
        for (var i = 0; i < data.length; i++) {
          switch (type) {
            case 0: HEAP32[(((params)+(i*4))>>2)] = data[i]; break;
            case 2: HEAPF32[(((params)+(i*4))>>2)] = data[i]; break;
            case 5: HEAP32[(((params)+(i*4))>>2)] = Math.fround(data[i]); break;
          }
        }
      }
    }
  function _emscripten_glGetVertexAttribIiv(index, pname, params) {
      // N.B. This function may only be called if the vertex attribute was specified using the function glVertexAttribI4iv(),
      // otherwise the results are undefined. (GLES3 spec 6.1.12)
      emscriptenWebGLGetVertexAttrib(index, pname, params, 0);
    }

  function _emscripten_glGetVertexAttribIuiv(index, pname, params) {
      // N.B. This function may only be called if the vertex attribute was specified using the function glVertexAttribI4iv(),
      // otherwise the results are undefined. (GLES3 spec 6.1.12)
      emscriptenWebGLGetVertexAttrib(index, pname, params, 0);
    }

  function _emscripten_glGetVertexAttribPointerv(index, pname, pointer) {
      if (!pointer) {
        // GLES2 specification does not specify how to behave if pointer is a null pointer. Since calling this function does not make sense
        // if pointer == null, issue a GL error to notify user about it.
        GL.recordError(0x501 /* GL_INVALID_VALUE */);
        return;
      }
      if (GL.currentContext.clientBuffers[index].enabled) {
        err("glGetVertexAttribPointer on client-side array: not supported, bad data returned");
      }
      HEAP32[((pointer)>>2)] = GLctx.getVertexAttribOffset(index, pname);
    }

  
  function _emscripten_glGetVertexAttribfv(index, pname, params) {
      // N.B. This function may only be called if the vertex attribute was specified using the function glVertexAttrib*f(),
      // otherwise the results are undefined. (GLES3 spec 6.1.12)
      emscriptenWebGLGetVertexAttrib(index, pname, params, 2);
    }

  
  function _emscripten_glGetVertexAttribiv(index, pname, params) {
      // N.B. This function may only be called if the vertex attribute was specified using the function glVertexAttrib*f(),
      // otherwise the results are undefined. (GLES3 spec 6.1.12)
      emscriptenWebGLGetVertexAttrib(index, pname, params, 5);
    }

  function _emscripten_glHint(x0, x1) { GLctx['hint'](x0, x1) }

  function _emscripten_glInvalidateFramebuffer(target, numAttachments, attachments) {
      var list = tempFixedLengthArray[numAttachments];
      for (var i = 0; i < numAttachments; i++) {
        list[i] = HEAP32[(((attachments)+(i*4))>>2)];
      }
  
      GLctx['invalidateFramebuffer'](target, list);
    }

  function _emscripten_glInvalidateSubFramebuffer(target, numAttachments, attachments, x, y, width, height) {
      var list = tempFixedLengthArray[numAttachments];
      for (var i = 0; i < numAttachments; i++) {
        list[i] = HEAP32[(((attachments)+(i*4))>>2)];
      }
  
      GLctx['invalidateSubFramebuffer'](target, list, x, y, width, height);
    }

  function _emscripten_glIsBuffer(buffer) {
      var b = GL.buffers[buffer];
      if (!b) return 0;
      return GLctx.isBuffer(b);
    }

  function _emscripten_glIsEnabled(x0) { return GLctx['isEnabled'](x0) }

  function _emscripten_glIsFramebuffer(framebuffer) {
      var fb = GL.framebuffers[framebuffer];
      if (!fb) return 0;
      return GLctx.isFramebuffer(fb);
    }

  function _emscripten_glIsProgram(program) {
      program = GL.programs[program];
      if (!program) return 0;
      return GLctx.isProgram(program);
    }

  function _emscripten_glIsQuery(id) {
      var query = GL.queries[id];
      if (!query) return 0;
      return GLctx['isQuery'](query);
    }

  function _emscripten_glIsQueryEXT(id) {
      var query = GL.queries[id];
      if (!query) return 0;
      return GLctx.disjointTimerQueryExt['isQueryEXT'](query);
    }

  function _emscripten_glIsRenderbuffer(renderbuffer) {
      var rb = GL.renderbuffers[renderbuffer];
      if (!rb) return 0;
      return GLctx.isRenderbuffer(rb);
    }

  function _emscripten_glIsSampler(id) {
      var sampler = GL.samplers[id];
      if (!sampler) return 0;
      return GLctx['isSampler'](sampler);
    }

  function _emscripten_glIsShader(shader) {
      var s = GL.shaders[shader];
      if (!s) return 0;
      return GLctx.isShader(s);
    }

  function _emscripten_glIsSync(sync) {
      return GLctx.isSync(GL.syncs[sync]);
    }

  function _emscripten_glIsTexture(id) {
      var texture = GL.textures[id];
      if (!texture) return 0;
      return GLctx.isTexture(texture);
    }

  function _emscripten_glIsTransformFeedback(id) {
      return GLctx['isTransformFeedback'](GL.transformFeedbacks[id]);
    }

  function _emscripten_glIsVertexArray(array) {
  
      var vao = GL.vaos[array];
      if (!vao) return 0;
      return GLctx['isVertexArray'](vao);
    }

  function _emscripten_glIsVertexArrayOES(array) {
  
      var vao = GL.vaos[array];
      if (!vao) return 0;
      return GLctx['isVertexArray'](vao);
    }

  function _emscripten_glLineWidth(x0) { GLctx['lineWidth'](x0) }

  function _emscripten_glLinkProgram(program) {
      program = GL.programs[program];
      GLctx.linkProgram(program);
      // Invalidate earlier computed uniform->ID mappings, those have now become stale
      program.uniformLocsById = 0; // Mark as null-like so that glGetUniformLocation() knows to populate this again.
      program.uniformSizeAndIdsByName = {};
  
    }

  
  
  function _emscripten_glMapBufferRange(target, offset, length, access) {
      if ((access & (0x1/*GL_MAP_READ_BIT*/ | 0x20/*GL_MAP_UNSYNCHRONIZED_BIT*/)) != 0) {
        err("glMapBufferRange access does not support MAP_READ or MAP_UNSYNCHRONIZED");
        return 0;
      }
  
      if ((access & 0x2/*GL_MAP_WRITE_BIT*/) == 0) {
        err("glMapBufferRange access must include MAP_WRITE");
        return 0;
      }
  
      if ((access & (0x4/*GL_MAP_INVALIDATE_BUFFER_BIT*/ | 0x8/*GL_MAP_INVALIDATE_RANGE_BIT*/)) == 0) {
        err("glMapBufferRange access must include INVALIDATE_BUFFER or INVALIDATE_RANGE");
        return 0;
      }
  
      if (!emscriptenWebGLValidateMapBufferTarget(target)) {
        GL.recordError(0x500/*GL_INVALID_ENUM*/);
        err('GL_INVALID_ENUM in glMapBufferRange');
        return 0;
      }
  
      var mem = _malloc(length);
      if (!mem) return 0;
  
      GL.mappedBuffers[emscriptenWebGLGetBufferBinding(target)] = {
        offset: offset,
        length: length,
        mem: mem,
        access: access,
      };
      return mem;
    }

  function _emscripten_glPauseTransformFeedback() { GLctx['pauseTransformFeedback']() }

  function _emscripten_glPixelStorei(pname, param) {
      if (pname == 0xCF5 /* GL_UNPACK_ALIGNMENT */) {
        GL.unpackAlignment = param;
      }
      GLctx.pixelStorei(pname, param);
    }

  function _emscripten_glPolygonOffset(x0, x1) { GLctx['polygonOffset'](x0, x1) }

  function _emscripten_glProgramBinary(program, binaryFormat, binary, length) {
      GL.recordError(0x500/*GL_INVALID_ENUM*/);
    }

  function _emscripten_glProgramParameteri(program, pname, value) {
      GL.recordError(0x500/*GL_INVALID_ENUM*/);
    }

  function _emscripten_glQueryCounterEXT(id, target) {
      GLctx.disjointTimerQueryExt['queryCounterEXT'](GL.queries[id], target);
    }

  function _emscripten_glReadBuffer(x0) { GLctx['readBuffer'](x0) }

  function computeUnpackAlignedImageSize(width, height, sizePerPixel, alignment) {
      function roundedToNextMultipleOf(x, y) {
        return (x + y - 1) & -y;
      }
      var plainRowSize = width * sizePerPixel;
      var alignedRowSize = roundedToNextMultipleOf(plainRowSize, alignment);
      return height * alignedRowSize;
    }
  
  function __colorChannelsInGlTextureFormat(format) {
      // Micro-optimizations for size: map format to size by subtracting smallest enum value (0x1902) from all values first.
      // Also omit the most common size value (1) from the list, which is assumed by formats not on the list.
      var colorChannels = {
        // 0x1902 /* GL_DEPTH_COMPONENT */ - 0x1902: 1,
        // 0x1906 /* GL_ALPHA */ - 0x1902: 1,
        5: 3,
        6: 4,
        // 0x1909 /* GL_LUMINANCE */ - 0x1902: 1,
        8: 2,
        29502: 3,
        29504: 4,
        // 0x1903 /* GL_RED */ - 0x1902: 1,
        26917: 2,
        26918: 2,
        // 0x8D94 /* GL_RED_INTEGER */ - 0x1902: 1,
        29846: 3,
        29847: 4
      };
      return colorChannels[format - 0x1902]||1;
    }
  
  function heapObjectForWebGLType(type) {
      // Micro-optimization for size: Subtract lowest GL enum number (0x1400/* GL_BYTE */) from type to compare
      // smaller values for the heap, for shorter generated code size.
      // Also the type HEAPU16 is not tested for explicitly, but any unrecognized type will return out HEAPU16.
      // (since most types are HEAPU16)
      type -= 0x1400;
      if (type == 0) return HEAP8;
  
      if (type == 1) return HEAPU8;
  
      if (type == 2) return HEAP16;
  
      if (type == 4) return HEAP32;
  
      if (type == 6) return HEAPF32;
  
      if (type == 5
        || type == 28922
        || type == 28520
        || type == 30779
        || type == 30782
        )
        return HEAPU32;
  
      return HEAPU16;
    }
  
  function heapAccessShiftForWebGLHeap(heap) {
      return 31 - Math.clz32(heap.BYTES_PER_ELEMENT);
    }
  
  function emscriptenWebGLGetTexPixelData(type, format, width, height, pixels, internalFormat) {
      var heap = heapObjectForWebGLType(type);
      var shift = heapAccessShiftForWebGLHeap(heap);
      var byteSize = 1<<shift;
      var sizePerPixel = __colorChannelsInGlTextureFormat(format) * byteSize;
      var bytes = computeUnpackAlignedImageSize(width, height, sizePerPixel, GL.unpackAlignment);
      return heap.subarray(pixels >> shift, pixels + bytes >> shift);
    }
  
  
  
  function _emscripten_glReadPixels(x, y, width, height, format, type, pixels) {
      if (true) { // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
        if (GLctx.currentPixelPackBufferBinding) {
          GLctx.readPixels(x, y, width, height, format, type, pixels);
        } else {
          var heap = heapObjectForWebGLType(type);
          GLctx.readPixels(x, y, width, height, format, type, heap, pixels >> heapAccessShiftForWebGLHeap(heap));
        }
        return;
      }
      var pixelData = emscriptenWebGLGetTexPixelData(type, format, width, height, pixels, format);
      if (!pixelData) {
        GL.recordError(0x500/*GL_INVALID_ENUM*/);
        return;
      }
      GLctx.readPixels(x, y, width, height, format, type, pixelData);
    }

  function _emscripten_glReleaseShaderCompiler() {
      // NOP (as allowed by GLES 2.0 spec)
    }

  function _emscripten_glRenderbufferStorage(x0, x1, x2, x3) { GLctx['renderbufferStorage'](x0, x1, x2, x3) }

  function _emscripten_glRenderbufferStorageMultisample(x0, x1, x2, x3, x4) { GLctx['renderbufferStorageMultisample'](x0, x1, x2, x3, x4) }

  function _emscripten_glResumeTransformFeedback() { GLctx['resumeTransformFeedback']() }

  function _emscripten_glSampleCoverage(value, invert) {
      GLctx.sampleCoverage(value, !!invert);
    }

  function _emscripten_glSamplerParameterf(sampler, pname, param) {
      GLctx['samplerParameterf'](GL.samplers[sampler], pname, param);
    }

  function _emscripten_glSamplerParameterfv(sampler, pname, params) {
      var param = HEAPF32[((params)>>2)];
      GLctx['samplerParameterf'](GL.samplers[sampler], pname, param);
    }

  function _emscripten_glSamplerParameteri(sampler, pname, param) {
      GLctx['samplerParameteri'](GL.samplers[sampler], pname, param);
    }

  function _emscripten_glSamplerParameteriv(sampler, pname, params) {
      var param = HEAP32[((params)>>2)];
      GLctx['samplerParameteri'](GL.samplers[sampler], pname, param);
    }

  function _emscripten_glScissor(x0, x1, x2, x3) { GLctx['scissor'](x0, x1, x2, x3) }

  function _emscripten_glShaderBinary() {
      GL.recordError(0x500/*GL_INVALID_ENUM*/);
    }

  function _emscripten_glShaderSource(shader, count, string, length) {
      var source = GL.getSource(shader, count, string, length);
  
      GLctx.shaderSource(GL.shaders[shader], source);
    }

  function _emscripten_glStencilFunc(x0, x1, x2) { GLctx['stencilFunc'](x0, x1, x2) }

  function _emscripten_glStencilFuncSeparate(x0, x1, x2, x3) { GLctx['stencilFuncSeparate'](x0, x1, x2, x3) }

  function _emscripten_glStencilMask(x0) { GLctx['stencilMask'](x0) }

  function _emscripten_glStencilMaskSeparate(x0, x1) { GLctx['stencilMaskSeparate'](x0, x1) }

  function _emscripten_glStencilOp(x0, x1, x2) { GLctx['stencilOp'](x0, x1, x2) }

  function _emscripten_glStencilOpSeparate(x0, x1, x2, x3) { GLctx['stencilOpSeparate'](x0, x1, x2, x3) }

  
  
  
  function _emscripten_glTexImage2D(target, level, internalFormat, width, height, border, format, type, pixels) {
      if (true) {
        // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
        if (GLctx.currentPixelUnpackBufferBinding) {
          GLctx.texImage2D(target, level, internalFormat, width, height, border, format, type, pixels);
        } else if (pixels) {
          var heap = heapObjectForWebGLType(type);
          GLctx.texImage2D(target, level, internalFormat, width, height, border, format, type, heap, pixels >> heapAccessShiftForWebGLHeap(heap));
        } else {
          GLctx.texImage2D(target, level, internalFormat, width, height, border, format, type, null);
        }
        return;
      }
      GLctx.texImage2D(target, level, internalFormat, width, height, border, format, type, pixels ? emscriptenWebGLGetTexPixelData(type, format, width, height, pixels, internalFormat) : null);
    }

  
  function _emscripten_glTexImage3D(target, level, internalFormat, width, height, depth, border, format, type, pixels) {
      if (GLctx.currentPixelUnpackBufferBinding) {
        GLctx['texImage3D'](target, level, internalFormat, width, height, depth, border, format, type, pixels);
      } else if (pixels) {
        var heap = heapObjectForWebGLType(type);
        GLctx['texImage3D'](target, level, internalFormat, width, height, depth, border, format, type, heap, pixels >> heapAccessShiftForWebGLHeap(heap));
      } else {
        GLctx['texImage3D'](target, level, internalFormat, width, height, depth, border, format, type, null);
      }
    }

  function _emscripten_glTexParameterf(x0, x1, x2) { GLctx['texParameterf'](x0, x1, x2) }

  function _emscripten_glTexParameterfv(target, pname, params) {
      var param = HEAPF32[((params)>>2)];
      GLctx.texParameterf(target, pname, param);
    }

  function _emscripten_glTexParameteri(x0, x1, x2) { GLctx['texParameteri'](x0, x1, x2) }

  function _emscripten_glTexParameteriv(target, pname, params) {
      var param = HEAP32[((params)>>2)];
      GLctx.texParameteri(target, pname, param);
    }

  function _emscripten_glTexStorage2D(x0, x1, x2, x3, x4) { GLctx['texStorage2D'](x0, x1, x2, x3, x4) }

  function _emscripten_glTexStorage3D(x0, x1, x2, x3, x4, x5) { GLctx['texStorage3D'](x0, x1, x2, x3, x4, x5) }

  
  
  
  function _emscripten_glTexSubImage2D(target, level, xoffset, yoffset, width, height, format, type, pixels) {
      if (true) {
        // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
        if (GLctx.currentPixelUnpackBufferBinding) {
          GLctx.texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, pixels);
        } else if (pixels) {
          var heap = heapObjectForWebGLType(type);
          GLctx.texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, heap, pixels >> heapAccessShiftForWebGLHeap(heap));
        } else {
          GLctx.texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, null);
        }
        return;
      }
      var pixelData = null;
      if (pixels) pixelData = emscriptenWebGLGetTexPixelData(type, format, width, height, pixels, 0);
      GLctx.texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, pixelData);
    }

  
  function _emscripten_glTexSubImage3D(target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, pixels) {
      if (GLctx.currentPixelUnpackBufferBinding) {
        GLctx['texSubImage3D'](target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, pixels);
      } else if (pixels) {
        var heap = heapObjectForWebGLType(type);
        GLctx['texSubImage3D'](target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, heap, pixels >> heapAccessShiftForWebGLHeap(heap));
      } else {
        GLctx['texSubImage3D'](target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, null);
      }
    }

  function _emscripten_glTransformFeedbackVaryings(program, count, varyings, bufferMode) {
      program = GL.programs[program];
      var vars = [];
      for (var i = 0; i < count; i++)
        vars.push(UTF8ToString(HEAP32[(((varyings)+(i*4))>>2)]));
  
      GLctx['transformFeedbackVaryings'](program, vars, bufferMode);
    }

  
  function _emscripten_glUniform1f(location, v0) {
      GLctx.uniform1f(webglGetUniformLocation(location), v0);
    }

  
  function _emscripten_glUniform1fv(location, count, value) {
  
      count && GLctx.uniform1fv(webglGetUniformLocation(location), HEAPF32, value>>2, count);
    }

  
  function _emscripten_glUniform1i(location, v0) {
      GLctx.uniform1i(webglGetUniformLocation(location), v0);
    }

  
  function _emscripten_glUniform1iv(location, count, value) {
  
      count && GLctx.uniform1iv(webglGetUniformLocation(location), HEAP32, value>>2, count);
    }

  function _emscripten_glUniform1ui(location, v0) {
      GLctx.uniform1ui(webglGetUniformLocation(location), v0);
    }

  function _emscripten_glUniform1uiv(location, count, value) {
      count && GLctx.uniform1uiv(webglGetUniformLocation(location), HEAPU32, value>>2, count);
    }

  
  function _emscripten_glUniform2f(location, v0, v1) {
      GLctx.uniform2f(webglGetUniformLocation(location), v0, v1);
    }

  
  function _emscripten_glUniform2fv(location, count, value) {
  
      count && GLctx.uniform2fv(webglGetUniformLocation(location), HEAPF32, value>>2, count*2);
    }

  
  function _emscripten_glUniform2i(location, v0, v1) {
      GLctx.uniform2i(webglGetUniformLocation(location), v0, v1);
    }

  
  function _emscripten_glUniform2iv(location, count, value) {
  
      count && GLctx.uniform2iv(webglGetUniformLocation(location), HEAP32, value>>2, count*2);
    }

  function _emscripten_glUniform2ui(location, v0, v1) {
      GLctx.uniform2ui(webglGetUniformLocation(location), v0, v1);
    }

  function _emscripten_glUniform2uiv(location, count, value) {
      count && GLctx.uniform2uiv(webglGetUniformLocation(location), HEAPU32, value>>2, count*2);
    }

  
  function _emscripten_glUniform3f(location, v0, v1, v2) {
      GLctx.uniform3f(webglGetUniformLocation(location), v0, v1, v2);
    }

  
  function _emscripten_glUniform3fv(location, count, value) {
  
      count && GLctx.uniform3fv(webglGetUniformLocation(location), HEAPF32, value>>2, count*3);
    }

  
  function _emscripten_glUniform3i(location, v0, v1, v2) {
      GLctx.uniform3i(webglGetUniformLocation(location), v0, v1, v2);
    }

  
  function _emscripten_glUniform3iv(location, count, value) {
  
      count && GLctx.uniform3iv(webglGetUniformLocation(location), HEAP32, value>>2, count*3);
    }

  function _emscripten_glUniform3ui(location, v0, v1, v2) {
      GLctx.uniform3ui(webglGetUniformLocation(location), v0, v1, v2);
    }

  function _emscripten_glUniform3uiv(location, count, value) {
      count && GLctx.uniform3uiv(webglGetUniformLocation(location), HEAPU32, value>>2, count*3);
    }

  
  function _emscripten_glUniform4f(location, v0, v1, v2, v3) {
      GLctx.uniform4f(webglGetUniformLocation(location), v0, v1, v2, v3);
    }

  
  function _emscripten_glUniform4fv(location, count, value) {
  
      count && GLctx.uniform4fv(webglGetUniformLocation(location), HEAPF32, value>>2, count*4);
    }

  
  function _emscripten_glUniform4i(location, v0, v1, v2, v3) {
      GLctx.uniform4i(webglGetUniformLocation(location), v0, v1, v2, v3);
    }

  
  function _emscripten_glUniform4iv(location, count, value) {
  
      count && GLctx.uniform4iv(webglGetUniformLocation(location), HEAP32, value>>2, count*4);
    }

  function _emscripten_glUniform4ui(location, v0, v1, v2, v3) {
      GLctx.uniform4ui(webglGetUniformLocation(location), v0, v1, v2, v3);
    }

  function _emscripten_glUniform4uiv(location, count, value) {
      count && GLctx.uniform4uiv(webglGetUniformLocation(location), HEAPU32, value>>2, count*4);
    }

  function _emscripten_glUniformBlockBinding(program, uniformBlockIndex, uniformBlockBinding) {
      program = GL.programs[program];
  
      GLctx['uniformBlockBinding'](program, uniformBlockIndex, uniformBlockBinding);
    }

  
  function _emscripten_glUniformMatrix2fv(location, count, transpose, value) {
  
      count && GLctx.uniformMatrix2fv(webglGetUniformLocation(location), !!transpose, HEAPF32, value>>2, count*4);
    }

  function _emscripten_glUniformMatrix2x3fv(location, count, transpose, value) {
      count && GLctx.uniformMatrix2x3fv(webglGetUniformLocation(location), !!transpose, HEAPF32, value>>2, count*6);
    }

  function _emscripten_glUniformMatrix2x4fv(location, count, transpose, value) {
      count && GLctx.uniformMatrix2x4fv(webglGetUniformLocation(location), !!transpose, HEAPF32, value>>2, count*8);
    }

  
  function _emscripten_glUniformMatrix3fv(location, count, transpose, value) {
  
      count && GLctx.uniformMatrix3fv(webglGetUniformLocation(location), !!transpose, HEAPF32, value>>2, count*9);
    }

  function _emscripten_glUniformMatrix3x2fv(location, count, transpose, value) {
      count && GLctx.uniformMatrix3x2fv(webglGetUniformLocation(location), !!transpose, HEAPF32, value>>2, count*6);
    }

  function _emscripten_glUniformMatrix3x4fv(location, count, transpose, value) {
      count && GLctx.uniformMatrix3x4fv(webglGetUniformLocation(location), !!transpose, HEAPF32, value>>2, count*12);
    }

  
  function _emscripten_glUniformMatrix4fv(location, count, transpose, value) {
  
      count && GLctx.uniformMatrix4fv(webglGetUniformLocation(location), !!transpose, HEAPF32, value>>2, count*16);
    }

  function _emscripten_glUniformMatrix4x2fv(location, count, transpose, value) {
      count && GLctx.uniformMatrix4x2fv(webglGetUniformLocation(location), !!transpose, HEAPF32, value>>2, count*8);
    }

  function _emscripten_glUniformMatrix4x3fv(location, count, transpose, value) {
      count && GLctx.uniformMatrix4x3fv(webglGetUniformLocation(location), !!transpose, HEAPF32, value>>2, count*12);
    }

  
  
  function _emscripten_glUnmapBuffer(target) {
      if (!emscriptenWebGLValidateMapBufferTarget(target)) {
        GL.recordError(0x500/*GL_INVALID_ENUM*/);
        err('GL_INVALID_ENUM in glUnmapBuffer');
        return 0;
      }
  
      var buffer = emscriptenWebGLGetBufferBinding(target);
      var mapping = GL.mappedBuffers[buffer];
      if (!mapping) {
        GL.recordError(0x502 /* GL_INVALID_OPERATION */);
        err('buffer was never mapped in glUnmapBuffer');
        return 0;
      }
      GL.mappedBuffers[buffer] = null;
  
      if (!(mapping.access & 0x10)) /* GL_MAP_FLUSH_EXPLICIT_BIT */
        if (true) { // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
          GLctx.bufferSubData(target, mapping.offset, HEAPU8, mapping.mem, mapping.length);
        } else {
          GLctx.bufferSubData(target, mapping.offset, HEAPU8.subarray(mapping.mem, mapping.mem+mapping.length));
        }
      _free(mapping.mem);
      return 1;
    }

  function _emscripten_glUseProgram(program) {
      program = GL.programs[program];
      GLctx.useProgram(program);
      // Record the currently active program so that we can access the uniform
      // mapping table of that program.
      GLctx.currentProgram = program;
    }

  function _emscripten_glValidateProgram(program) {
      GLctx.validateProgram(GL.programs[program]);
    }

  function _emscripten_glVertexAttrib1f(x0, x1) { GLctx['vertexAttrib1f'](x0, x1) }

  function _emscripten_glVertexAttrib1fv(index, v) {
  
      GLctx.vertexAttrib1f(index, HEAPF32[v>>2]);
    }

  function _emscripten_glVertexAttrib2f(x0, x1, x2) { GLctx['vertexAttrib2f'](x0, x1, x2) }

  function _emscripten_glVertexAttrib2fv(index, v) {
  
      GLctx.vertexAttrib2f(index, HEAPF32[v>>2], HEAPF32[v+4>>2]);
    }

  function _emscripten_glVertexAttrib3f(x0, x1, x2, x3) { GLctx['vertexAttrib3f'](x0, x1, x2, x3) }

  function _emscripten_glVertexAttrib3fv(index, v) {
  
      GLctx.vertexAttrib3f(index, HEAPF32[v>>2], HEAPF32[v+4>>2], HEAPF32[v+8>>2]);
    }

  function _emscripten_glVertexAttrib4f(x0, x1, x2, x3, x4) { GLctx['vertexAttrib4f'](x0, x1, x2, x3, x4) }

  function _emscripten_glVertexAttrib4fv(index, v) {
  
      GLctx.vertexAttrib4f(index, HEAPF32[v>>2], HEAPF32[v+4>>2], HEAPF32[v+8>>2], HEAPF32[v+12>>2]);
    }

  function _emscripten_glVertexAttribDivisor(index, divisor) {
      GLctx['vertexAttribDivisor'](index, divisor);
    }

  function _emscripten_glVertexAttribDivisorANGLE(index, divisor) {
      GLctx['vertexAttribDivisor'](index, divisor);
    }

  function _emscripten_glVertexAttribDivisorARB(index, divisor) {
      GLctx['vertexAttribDivisor'](index, divisor);
    }

  function _emscripten_glVertexAttribDivisorEXT(index, divisor) {
      GLctx['vertexAttribDivisor'](index, divisor);
    }

  function _emscripten_glVertexAttribDivisorNV(index, divisor) {
      GLctx['vertexAttribDivisor'](index, divisor);
    }

  function _emscripten_glVertexAttribI4i(x0, x1, x2, x3, x4) { GLctx['vertexAttribI4i'](x0, x1, x2, x3, x4) }

  function _emscripten_glVertexAttribI4iv(index, v) {
      GLctx.vertexAttribI4i(index, HEAP32[v>>2], HEAP32[v+4>>2], HEAP32[v+8>>2], HEAP32[v+12>>2]);
    }

  function _emscripten_glVertexAttribI4ui(x0, x1, x2, x3, x4) { GLctx['vertexAttribI4ui'](x0, x1, x2, x3, x4) }

  function _emscripten_glVertexAttribI4uiv(index, v) {
      GLctx.vertexAttribI4ui(index, HEAPU32[v>>2], HEAPU32[v+4>>2], HEAPU32[v+8>>2], HEAPU32[v+12>>2]);
    }

  function _emscripten_glVertexAttribIPointer(index, size, type, stride, ptr) {
      var cb = GL.currentContext.clientBuffers[index];
      if (!GLctx.currentArrayBufferBinding) {
        cb.size = size;
        cb.type = type;
        cb.normalized = false;
        cb.stride = stride;
        cb.ptr = ptr;
        cb.clientside = true;
        cb.vertexAttribPointerAdaptor = function(index, size, type, normalized, stride, ptr) {
          this.vertexAttribIPointer(index, size, type, stride, ptr);
        };
        return;
      }
      cb.clientside = false;
      GLctx['vertexAttribIPointer'](index, size, type, stride, ptr);
    }

  function _emscripten_glVertexAttribPointer(index, size, type, normalized, stride, ptr) {
      var cb = GL.currentContext.clientBuffers[index];
      if (!GLctx.currentArrayBufferBinding) {
        cb.size = size;
        cb.type = type;
        cb.normalized = normalized;
        cb.stride = stride;
        cb.ptr = ptr;
        cb.clientside = true;
        cb.vertexAttribPointerAdaptor = function(index, size, type, normalized, stride, ptr) {
          this.vertexAttribPointer(index, size, type, normalized, stride, ptr);
        };
        return;
      }
      cb.clientside = false;
      GLctx.vertexAttribPointer(index, size, type, !!normalized, stride, ptr);
    }

  function _emscripten_glViewport(x0, x1, x2, x3) { GLctx['viewport'](x0, x1, x2, x3) }

  function _emscripten_glWaitSync(sync, flags, timeout_low, timeout_high) {
      // See WebGL2 vs GLES3 difference on GL_TIMEOUT_IGNORED above (https://www.khronos.org/registry/webgl/specs/latest/2.0/#5.15)
      var timeout = convertI32PairToI53(timeout_low, timeout_high);
      GLctx.waitSync(GL.syncs[sync], flags, timeout);
    }

  function _emscripten_has_asyncify() {
      return 0;
    }

  function _emscripten_memcpy_big(dest, src, num) {
      HEAPU8.copyWithin(dest, src, src + num);
    }

  
  
  
  
  
  
  
  function doRequestFullscreen(target, strategy) {
      if (!JSEvents.fullscreenEnabled()) return -1;
      target = findEventTarget(target);
      if (!target) return -4;
  
      if (!target.requestFullscreen
        && !target.webkitRequestFullscreen
        ) {
        return -3;
      }
  
      var canPerformRequests = JSEvents.canPerformEventHandlerRequests();
  
      // Queue this function call if we're not currently in an event handler and the user saw it appropriate to do so.
      if (!canPerformRequests) {
        if (strategy.deferUntilInEventHandler) {
          JSEvents.deferCall(JSEvents_requestFullscreen, 1 /* priority over pointer lock */, [target, strategy]);
          return 1;
        }
        return -2;
      }
  
      return JSEvents_requestFullscreen(target, strategy);
    }
  
  
  function _emscripten_request_fullscreen_strategy(target, deferUntilInEventHandler, fullscreenStrategy) {
      var strategy = {
        scaleMode: HEAP32[((fullscreenStrategy)>>2)],
        canvasResolutionScaleMode: HEAP32[(((fullscreenStrategy)+(4))>>2)],
        filteringMode: HEAP32[(((fullscreenStrategy)+(8))>>2)],
        deferUntilInEventHandler: deferUntilInEventHandler,
        canvasResizedCallback: HEAP32[(((fullscreenStrategy)+(12))>>2)],
        canvasResizedCallbackUserData: HEAP32[(((fullscreenStrategy)+(16))>>2)]
      };
  
      return doRequestFullscreen(target, strategy);
    }

  
  
  function _emscripten_request_pointerlock(target, deferUntilInEventHandler) {
      target = findEventTarget(target);
      if (!target) return -4;
      if (!target.requestPointerLock
        ) {
        return -1;
      }
  
      var canPerformRequests = JSEvents.canPerformEventHandlerRequests();
  
      // Queue this function call if we're not currently in an event handler and the user saw it appropriate to do so.
      if (!canPerformRequests) {
        if (deferUntilInEventHandler) {
          JSEvents.deferCall(requestPointerLock, 2 /* priority below fullscreen */, [target]);
          return 1;
        }
        return -2;
      }
  
      return requestPointerLock(target);
    }

  function getHeapMax() {
      // Stay one Wasm page short of 4GB: while e.g. Chrome is able to allocate
      // full 4GB Wasm memories, the size will wrap back to 0 bytes in Wasm side
      // for any code that deals with heap sizes, which would require special
      // casing all heap size related code to treat 0 specially.
      return 2147483648;
    }
  
  function emscripten_realloc_buffer(size) {
      var b = wasmMemory.buffer;
      try {
        // round size grow request up to wasm page size (fixed 64KB per spec)
        wasmMemory.grow((size - b.byteLength + 65535) >>> 16); // .grow() takes a delta compared to the previous size
        updateMemoryViews();
        return 1 /*success*/;
      } catch(e) {
        err('emscripten_realloc_buffer: Attempted to grow heap from ' + b.byteLength  + ' bytes to ' + size + ' bytes, but got error: ' + e);
      }
      // implicit 0 return to save code size (caller will cast "undefined" into 0
      // anyhow)
    }
  function _emscripten_resize_heap(requestedSize) {
      var oldSize = HEAPU8.length;
      requestedSize = requestedSize >>> 0;
      // With multithreaded builds, races can happen (another thread might increase the size
      // in between), so return a failure, and let the caller retry.
      assert(requestedSize > oldSize);
  
      // Memory resize rules:
      // 1.  Always increase heap size to at least the requested size, rounded up
      //     to next page multiple.
      // 2a. If MEMORY_GROWTH_LINEAR_STEP == -1, excessively resize the heap
      //     geometrically: increase the heap size according to
      //     MEMORY_GROWTH_GEOMETRIC_STEP factor (default +20%), At most
      //     overreserve by MEMORY_GROWTH_GEOMETRIC_CAP bytes (default 96MB).
      // 2b. If MEMORY_GROWTH_LINEAR_STEP != -1, excessively resize the heap
      //     linearly: increase the heap size by at least
      //     MEMORY_GROWTH_LINEAR_STEP bytes.
      // 3.  Max size for the heap is capped at 2048MB-WASM_PAGE_SIZE, or by
      //     MAXIMUM_MEMORY, or by ASAN limit, depending on which is smallest
      // 4.  If we were unable to allocate as much memory, it may be due to
      //     over-eager decision to excessively reserve due to (3) above.
      //     Hence if an allocation fails, cut down on the amount of excess
      //     growth, in an attempt to succeed to perform a smaller allocation.
  
      // A limit is set for how much we can grow. We should not exceed that
      // (the wasm binary specifies it, so if we tried, we'd fail anyhow).
      var maxHeapSize = getHeapMax();
      if (requestedSize > maxHeapSize) {
        err('Cannot enlarge memory, asked to go up to ' + requestedSize + ' bytes, but the limit is ' + maxHeapSize + ' bytes!');
        return false;
      }
  
      let alignUp = (x, multiple) => x + (multiple - x % multiple) % multiple;
  
      // Loop through potential heap size increases. If we attempt a too eager
      // reservation that fails, cut down on the attempted size and reserve a
      // smaller bump instead. (max 3 times, chosen somewhat arbitrarily)
      for (var cutDown = 1; cutDown <= 4; cutDown *= 2) {
        var overGrownHeapSize = oldSize * (1 + 0.2 / cutDown); // ensure geometric growth
        // but limit overreserving (default to capping at +96MB overgrowth at most)
        overGrownHeapSize = Math.min(overGrownHeapSize, requestedSize + 100663296 );
  
        var newSize = Math.min(maxHeapSize, alignUp(Math.max(requestedSize, overGrownHeapSize), 65536));
  
        var replacement = emscripten_realloc_buffer(newSize);
        if (replacement) {
  
          return true;
        }
      }
      err('Failed to grow the heap from ' + oldSize + ' bytes to ' + newSize + ' bytes, not enough memory!');
      return false;
    }

  function _emscripten_sample_gamepad_data() {
      return (JSEvents.lastGamepadState = (navigator.getGamepads ? navigator.getGamepads() : (navigator.webkitGetGamepads ? navigator.webkitGetGamepads() : null)))
        ? 0 : -1;
    }

  
  
  function registerBeforeUnloadEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString) {
      var beforeUnloadEventHandlerFunc = function(e = event) {
        // Note: This is always called on the main browser thread, since it needs synchronously return a value!
        var confirmationMessage = getWasmTableEntry(callbackfunc)(eventTypeId, 0, userData);
        
        if (confirmationMessage) {
          confirmationMessage = UTF8ToString(confirmationMessage);
        }
        if (confirmationMessage) {
          e.preventDefault();
          e.returnValue = confirmationMessage;
          return confirmationMessage;
        }
      };
  
      var eventHandler = {
        target: findEventTarget(target),
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: beforeUnloadEventHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  function _emscripten_set_beforeunload_callback_on_thread(userData, callbackfunc, targetThread) {
      if (typeof onbeforeunload == 'undefined') return -1;
      // beforeunload callback can only be registered on the main browser thread, because the page will go away immediately after returning from the handler,
      // and there is no time to start proxying it anywhere.
      if (targetThread !== 1) return -5;
      registerBeforeUnloadEventCallback(2, userData, true, callbackfunc, 28, "beforeunload");
      return 0;
    }

  
  
  function registerFocusEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.focusEvent) JSEvents.focusEvent = _malloc( 256 );
  
      var focusEventHandlerFunc = function(e = event) {
        var nodeName = JSEvents.getNodeNameForTarget(e.target);
        var id = e.target.id ? e.target.id : '';
  
        var focusEvent = JSEvents.focusEvent;
        stringToUTF8(nodeName, focusEvent + 0, 128);
        stringToUTF8(id, focusEvent + 128, 128);
  
        if (getWasmTableEntry(callbackfunc)(eventTypeId, focusEvent, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: findEventTarget(target),
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: focusEventHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  function _emscripten_set_blur_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerFocusEventCallback(target, userData, useCapture, callbackfunc, 12, "blur", targetThread);
      return 0;
    }


  
  function _emscripten_set_element_css_size(target, width, height) {
      target = findEventTarget(target);
      if (!target) return -4;
  
      target.style.width = width + "px";
      target.style.height = height + "px";
  
      return 0;
    }

  function _emscripten_set_focus_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerFocusEventCallback(target, userData, useCapture, callbackfunc, 13, "focus", targetThread);
      return 0;
    }

  
  
  function fillFullscreenChangeEventData(eventStruct) {
      var fullscreenElement = document.fullscreenElement || document.mozFullScreenElement || document.webkitFullscreenElement || document.msFullscreenElement;
      var isFullscreen = !!fullscreenElement;
      // Assigning a boolean to HEAP32 with expected type coercion.
      /** @suppress{checkTypes} */
      HEAP32[((eventStruct)>>2)] = isFullscreen;
      HEAP32[(((eventStruct)+(4))>>2)] = JSEvents.fullscreenEnabled();
      // If transitioning to fullscreen, report info about the element that is now fullscreen.
      // If transitioning to windowed mode, report info about the element that just was fullscreen.
      var reportedElement = isFullscreen ? fullscreenElement : JSEvents.previousFullscreenElement;
      var nodeName = JSEvents.getNodeNameForTarget(reportedElement);
      var id = (reportedElement && reportedElement.id) ? reportedElement.id : '';
      stringToUTF8(nodeName, eventStruct + 8, 128);
      stringToUTF8(id, eventStruct + 136, 128);
      HEAP32[(((eventStruct)+(264))>>2)] = reportedElement ? reportedElement.clientWidth : 0;
      HEAP32[(((eventStruct)+(268))>>2)] = reportedElement ? reportedElement.clientHeight : 0;
      HEAP32[(((eventStruct)+(272))>>2)] = screen.width;
      HEAP32[(((eventStruct)+(276))>>2)] = screen.height;
      if (isFullscreen) {
        JSEvents.previousFullscreenElement = fullscreenElement;
      }
    }
  
  
  function registerFullscreenChangeEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.fullscreenChangeEvent) JSEvents.fullscreenChangeEvent = _malloc( 280 );
  
      var fullscreenChangeEventhandlerFunc = function(e = event) {
        var fullscreenChangeEvent = JSEvents.fullscreenChangeEvent;
  
        fillFullscreenChangeEventData(fullscreenChangeEvent);
  
        if (getWasmTableEntry(callbackfunc)(eventTypeId, fullscreenChangeEvent, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: target,
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: fullscreenChangeEventhandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  
  
  function _emscripten_set_fullscreenchange_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      if (!JSEvents.fullscreenEnabled()) return -1;
      target = findEventTarget(target);
      if (!target) return -4;
      registerFullscreenChangeEventCallback(target, userData, useCapture, callbackfunc, 19, "fullscreenchange", targetThread);
  
      // Unprefixed Fullscreen API shipped in Chromium 71 (https://bugs.chromium.org/p/chromium/issues/detail?id=383813)
      // As of Safari 13.0.3 on macOS Catalina 10.15.1 still ships with prefixed webkitfullscreenchange. TODO: revisit this check once Safari ships unprefixed version.
      registerFullscreenChangeEventCallback(target, userData, useCapture, callbackfunc, 19, "webkitfullscreenchange", targetThread);
  
      return 0;
    }

  
  
  
  function registerGamepadEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.gamepadEvent) JSEvents.gamepadEvent = _malloc( 1432 );
  
      var gamepadEventHandlerFunc = function(e = event) {
        var gamepadEvent = JSEvents.gamepadEvent;
        fillGamepadEventData(gamepadEvent, e["gamepad"]);
  
        if (getWasmTableEntry(callbackfunc)(eventTypeId, gamepadEvent, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: findEventTarget(target),
        allowsDeferredCalls: true,
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: gamepadEventHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  function _emscripten_set_gamepadconnected_callback_on_thread(userData, useCapture, callbackfunc, targetThread) {
      if (!navigator.getGamepads && !navigator.webkitGetGamepads) return -1;
      registerGamepadEventCallback(2, userData, useCapture, callbackfunc, 26, "gamepadconnected", targetThread);
      return 0;
    }

  function _emscripten_set_gamepaddisconnected_callback_on_thread(userData, useCapture, callbackfunc, targetThread) {
      if (!navigator.getGamepads && !navigator.webkitGetGamepads) return -1;
      registerGamepadEventCallback(2, userData, useCapture, callbackfunc, 27, "gamepaddisconnected", targetThread);
      return 0;
    }

  
  
  function registerKeyEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.keyEvent) JSEvents.keyEvent = _malloc( 176 );
  
      var keyEventHandlerFunc = function(e) {
        assert(e);
  
        var keyEventData = JSEvents.keyEvent;
        HEAPF64[((keyEventData)>>3)] = e.timeStamp;
  
        var idx = keyEventData >> 2;
  
        HEAP32[idx + 2] = e.location;
        HEAP32[idx + 3] = e.ctrlKey;
        HEAP32[idx + 4] = e.shiftKey;
        HEAP32[idx + 5] = e.altKey;
        HEAP32[idx + 6] = e.metaKey;
        HEAP32[idx + 7] = e.repeat;
        HEAP32[idx + 8] = e.charCode;
        HEAP32[idx + 9] = e.keyCode;
        HEAP32[idx + 10] = e.which;
        stringToUTF8(e.key || '', keyEventData + 44, 32);
        stringToUTF8(e.code || '', keyEventData + 76, 32);
        stringToUTF8(e.char || '', keyEventData + 108, 32);
        stringToUTF8(e.locale || '', keyEventData + 140, 32);
  
        if (getWasmTableEntry(callbackfunc)(eventTypeId, keyEventData, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: findEventTarget(target),
        allowsDeferredCalls: true,
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: keyEventHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  function _emscripten_set_keydown_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerKeyEventCallback(target, userData, useCapture, callbackfunc, 2, "keydown", targetThread);
      return 0;
    }

  function _emscripten_set_keypress_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerKeyEventCallback(target, userData, useCapture, callbackfunc, 1, "keypress", targetThread);
      return 0;
    }

  function _emscripten_set_keyup_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerKeyEventCallback(target, userData, useCapture, callbackfunc, 3, "keyup", targetThread);
      return 0;
    }

  
  
  function _emscripten_set_main_loop(func, fps, simulateInfiniteLoop) {
      var browserIterationFunc = getWasmTableEntry(func);
      setMainLoop(browserIterationFunc, fps, simulateInfiniteLoop);
    }

  
  
  
  function fillMouseEventData(eventStruct, e, target) {
      assert(eventStruct % 4 == 0);
      HEAPF64[((eventStruct)>>3)] = e.timeStamp;
      var idx = eventStruct >> 2;
      HEAP32[idx + 2] = e.screenX;
      HEAP32[idx + 3] = e.screenY;
      HEAP32[idx + 4] = e.clientX;
      HEAP32[idx + 5] = e.clientY;
      HEAP32[idx + 6] = e.ctrlKey;
      HEAP32[idx + 7] = e.shiftKey;
      HEAP32[idx + 8] = e.altKey;
      HEAP32[idx + 9] = e.metaKey;
      HEAP16[idx*2 + 20] = e.button;
      HEAP16[idx*2 + 21] = e.buttons;
  
      HEAP32[idx + 11] = e["movementX"]
        ;
  
      HEAP32[idx + 12] = e["movementY"]
        ;
  
      var rect = getBoundingClientRect(target);
      HEAP32[idx + 13] = e.clientX - rect.left;
      HEAP32[idx + 14] = e.clientY - rect.top;
  
    }
  
  
  function registerMouseEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.mouseEvent) JSEvents.mouseEvent = _malloc( 72 );
      target = findEventTarget(target);
  
      var mouseEventHandlerFunc = function(e = event) {
        // TODO: Make this access thread safe, or this could update live while app is reading it.
        fillMouseEventData(JSEvents.mouseEvent, e, target);
  
        if (getWasmTableEntry(callbackfunc)(eventTypeId, JSEvents.mouseEvent, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: target,
        allowsDeferredCalls: eventTypeString != 'mousemove' && eventTypeString != 'mouseenter' && eventTypeString != 'mouseleave', // Mouse move events do not allow fullscreen/pointer lock requests to be handled in them!
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: mouseEventHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  function _emscripten_set_mousedown_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerMouseEventCallback(target, userData, useCapture, callbackfunc, 5, "mousedown", targetThread);
      return 0;
    }

  function _emscripten_set_mouseenter_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerMouseEventCallback(target, userData, useCapture, callbackfunc, 33, "mouseenter", targetThread);
      return 0;
    }

  function _emscripten_set_mouseleave_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerMouseEventCallback(target, userData, useCapture, callbackfunc, 34, "mouseleave", targetThread);
      return 0;
    }

  function _emscripten_set_mousemove_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerMouseEventCallback(target, userData, useCapture, callbackfunc, 8, "mousemove", targetThread);
      return 0;
    }

  function _emscripten_set_mouseup_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerMouseEventCallback(target, userData, useCapture, callbackfunc, 6, "mouseup", targetThread);
      return 0;
    }

  
  
  function fillPointerlockChangeEventData(eventStruct) {
      var pointerLockElement = document.pointerLockElement || document.mozPointerLockElement || document.webkitPointerLockElement || document.msPointerLockElement;
      var isPointerlocked = !!pointerLockElement;
      // Assigning a boolean to HEAP32 with expected type coercion.
      /** @suppress{checkTypes} */
      HEAP32[((eventStruct)>>2)] = isPointerlocked;
      var nodeName = JSEvents.getNodeNameForTarget(pointerLockElement);
      var id = (pointerLockElement && pointerLockElement.id) ? pointerLockElement.id : '';
      stringToUTF8(nodeName, eventStruct + 4, 128);
      stringToUTF8(id, eventStruct + 132, 128);
    }
  
  
  function registerPointerlockChangeEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.pointerlockChangeEvent) JSEvents.pointerlockChangeEvent = _malloc( 260 );
  
      var pointerlockChangeEventHandlerFunc = function(e = event) {
        var pointerlockChangeEvent = JSEvents.pointerlockChangeEvent;
        fillPointerlockChangeEventData(pointerlockChangeEvent);
  
        if (getWasmTableEntry(callbackfunc)(eventTypeId, pointerlockChangeEvent, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: target,
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: pointerlockChangeEventHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  
  
  /** @suppress {missingProperties} */
  function _emscripten_set_pointerlockchange_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      // TODO: Currently not supported in pthreads or in --proxy-to-worker mode. (In pthreads mode, document object is not defined)
      if (!document || !document.body || (!document.body.requestPointerLock && !document.body.mozRequestPointerLock && !document.body.webkitRequestPointerLock && !document.body.msRequestPointerLock)) {
        return -1;
      }
  
      target = findEventTarget(target);
      if (!target) return -4;
      registerPointerlockChangeEventCallback(target, userData, useCapture, callbackfunc, 20, "pointerlockchange", targetThread);
      registerPointerlockChangeEventCallback(target, userData, useCapture, callbackfunc, 20, "mozpointerlockchange", targetThread);
      registerPointerlockChangeEventCallback(target, userData, useCapture, callbackfunc, 20, "webkitpointerlockchange", targetThread);
      registerPointerlockChangeEventCallback(target, userData, useCapture, callbackfunc, 20, "mspointerlockchange", targetThread);
      return 0;
    }

  
  
  function registerUiEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.uiEvent) JSEvents.uiEvent = _malloc( 36 );
  
      target = findEventTarget(target);
  
      var uiEventHandlerFunc = function(e = event) {
        if (e.target != target) {
          // Never take ui events such as scroll via a 'bubbled' route, but always from the direct element that
          // was targeted. Otherwise e.g. if app logs a message in response to a page scroll, the Emscripten log
          // message box could cause to scroll, generating a new (bubbled) scroll message, causing a new log print,
          // causing a new scroll, etc..
          return;
        }
        var b = document.body; // Take document.body to a variable, Closure compiler does not outline access to it on its own.
        if (!b) {
          // During a page unload 'body' can be null, with "Cannot read property 'clientWidth' of null" being thrown
          return;
        }
        var uiEvent = JSEvents.uiEvent;
        HEAP32[((uiEvent)>>2)] = e.detail;
        HEAP32[(((uiEvent)+(4))>>2)] = b.clientWidth;
        HEAP32[(((uiEvent)+(8))>>2)] = b.clientHeight;
        HEAP32[(((uiEvent)+(12))>>2)] = innerWidth;
        HEAP32[(((uiEvent)+(16))>>2)] = innerHeight;
        HEAP32[(((uiEvent)+(20))>>2)] = outerWidth;
        HEAP32[(((uiEvent)+(24))>>2)] = outerHeight;
        HEAP32[(((uiEvent)+(28))>>2)] = pageXOffset;
        HEAP32[(((uiEvent)+(32))>>2)] = pageYOffset;
        if (getWasmTableEntry(callbackfunc)(eventTypeId, uiEvent, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: target,
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: uiEventHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  function _emscripten_set_resize_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerUiEventCallback(target, userData, useCapture, callbackfunc, 10, "resize", targetThread);
      return 0;
    }

  
  
  
  function registerTouchEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.touchEvent) JSEvents.touchEvent = _malloc( 1696 );
  
      target = findEventTarget(target);
  
      var touchEventHandlerFunc = function(e) {
        assert(e);
        var t, touches = {}, et = e.touches;
        // To ease marshalling different kinds of touches that browser reports (all touches are listed in e.touches, 
        // only changed touches in e.changedTouches, and touches on target at a.targetTouches), mark a boolean in
        // each Touch object so that we can later loop only once over all touches we see to marshall over to Wasm.
  
        for (var i = 0; i < et.length; ++i) {
          t = et[i];
          // Browser might recycle the generated Touch objects between each frame (Firefox on Android), so reset any
          // changed/target states we may have set from previous frame.
          t.isChanged = t.onTarget = 0;
          touches[t.identifier] = t;
        }
        // Mark which touches are part of the changedTouches list.
        for (var i = 0; i < e.changedTouches.length; ++i) {
          t = e.changedTouches[i];
          t.isChanged = 1;
          touches[t.identifier] = t;
        }
        // Mark which touches are part of the targetTouches list.
        for (var i = 0; i < e.targetTouches.length; ++i) {
          touches[e.targetTouches[i].identifier].onTarget = 1;
        }
  
        var touchEvent = JSEvents.touchEvent;
        HEAPF64[((touchEvent)>>3)] = e.timeStamp;
        var idx = touchEvent>>2; // Pre-shift the ptr to index to HEAP32 to save code size
        HEAP32[idx + 3] = e.ctrlKey;
        HEAP32[idx + 4] = e.shiftKey;
        HEAP32[idx + 5] = e.altKey;
        HEAP32[idx + 6] = e.metaKey;
        idx += 7; // Advance to the start of the touch array.
        var targetRect = getBoundingClientRect(target);
        var numTouches = 0;
        for (var i in touches) {
          t = touches[i];
          HEAP32[idx + 0] = t.identifier;
          HEAP32[idx + 1] = t.screenX;
          HEAP32[idx + 2] = t.screenY;
          HEAP32[idx + 3] = t.clientX;
          HEAP32[idx + 4] = t.clientY;
          HEAP32[idx + 5] = t.pageX;
          HEAP32[idx + 6] = t.pageY;
          HEAP32[idx + 7] = t.isChanged;
          HEAP32[idx + 8] = t.onTarget;
          HEAP32[idx + 9] = t.clientX - targetRect.left;
          HEAP32[idx + 10] = t.clientY - targetRect.top;
  
          idx += 13;
  
          if (++numTouches > 31) {
            break;
          }
        }
        HEAP32[(((touchEvent)+(8))>>2)] = numTouches;
  
        if (getWasmTableEntry(callbackfunc)(eventTypeId, touchEvent, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: target,
        allowsDeferredCalls: eventTypeString == 'touchstart' || eventTypeString == 'touchend',
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: touchEventHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  function _emscripten_set_touchcancel_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerTouchEventCallback(target, userData, useCapture, callbackfunc, 25, "touchcancel", targetThread);
      return 0;
    }

  function _emscripten_set_touchend_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerTouchEventCallback(target, userData, useCapture, callbackfunc, 23, "touchend", targetThread);
      return 0;
    }

  function _emscripten_set_touchmove_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerTouchEventCallback(target, userData, useCapture, callbackfunc, 24, "touchmove", targetThread);
      return 0;
    }

  function _emscripten_set_touchstart_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      registerTouchEventCallback(target, userData, useCapture, callbackfunc, 22, "touchstart", targetThread);
      return 0;
    }

  
  function fillVisibilityChangeEventData(eventStruct) {
      var visibilityStates = [ "hidden", "visible", "prerender", "unloaded" ];
      var visibilityState = visibilityStates.indexOf(document.visibilityState);
  
      // Assigning a boolean to HEAP32 with expected type coercion.
      /** @suppress{checkTypes} */
      HEAP32[((eventStruct)>>2)] = document.hidden;
      HEAP32[(((eventStruct)+(4))>>2)] = visibilityState;
    }
  
  
  function registerVisibilityChangeEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.visibilityChangeEvent) JSEvents.visibilityChangeEvent = _malloc( 8 );
  
      var visibilityChangeEventHandlerFunc = function(e = event) {
        var visibilityChangeEvent = JSEvents.visibilityChangeEvent;
  
        fillVisibilityChangeEventData(visibilityChangeEvent);
  
        if (getWasmTableEntry(callbackfunc)(eventTypeId, visibilityChangeEvent, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: target,
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: visibilityChangeEventHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  
  function _emscripten_set_visibilitychange_callback_on_thread(userData, useCapture, callbackfunc, targetThread) {
    if (!specialHTMLTargets[1]) {
      return -4;
    }
      registerVisibilityChangeEventCallback(specialHTMLTargets[1], userData, useCapture, callbackfunc, 21, "visibilitychange", targetThread);
      return 0;
    }

  
  
  
  
  function registerWheelEventCallback(target, userData, useCapture, callbackfunc, eventTypeId, eventTypeString, targetThread) {
      if (!JSEvents.wheelEvent) JSEvents.wheelEvent = _malloc( 104 );
  
      // The DOM Level 3 events spec event 'wheel'
      var wheelHandlerFunc = function(e = event) {
        var wheelEvent = JSEvents.wheelEvent;
        fillMouseEventData(wheelEvent, e, target);
        HEAPF64[(((wheelEvent)+(72))>>3)] = e["deltaX"];
        HEAPF64[(((wheelEvent)+(80))>>3)] = e["deltaY"];
        HEAPF64[(((wheelEvent)+(88))>>3)] = e["deltaZ"];
        HEAP32[(((wheelEvent)+(96))>>2)] = e["deltaMode"];
        if (getWasmTableEntry(callbackfunc)(eventTypeId, wheelEvent, userData)) e.preventDefault();
      };
  
      var eventHandler = {
        target: target,
        allowsDeferredCalls: true,
        eventTypeString: eventTypeString,
        callbackfunc: callbackfunc,
        handlerFunc: wheelHandlerFunc,
        useCapture: useCapture
      };
      JSEvents.registerOrRemoveHandler(eventHandler);
    }
  
  function _emscripten_set_wheel_callback_on_thread(target, userData, useCapture, callbackfunc, targetThread) {
      target = findEventTarget(target);
      if (typeof target.onwheel != 'undefined') {
        registerWheelEventCallback(target, userData, useCapture, callbackfunc, 9, "wheel", targetThread);
        return 0;
      } else {
        return -1;
      }
    }

  function _emscripten_set_window_title(title) {
      setWindowTitle(UTF8ToString(title));
    }

  function _emscripten_sleep() {
      throw 'Please compile your program with async support in order to use asynchronous operations like emscripten_sleep';
    }

  var ENV = {};
  
  function getExecutableName() {
      return thisProgram || './this.program';
    }
  function getEnvStrings() {
      if (!getEnvStrings.strings) {
        // Default values.
        // Browser language detection #8751
        var lang = ((typeof navigator == 'object' && navigator.languages && navigator.languages[0]) || 'C').replace('-', '_') + '.UTF-8';
        var env = {
          'USER': 'web_user',
          'LOGNAME': 'web_user',
          'PATH': '/',
          'PWD': '/',
          'HOME': '/home/web_user',
          'LANG': lang,
          '_': getExecutableName()
        };
        // Apply the user-provided values, if any.
        for (var x in ENV) {
          // x is a key in ENV; if ENV[x] is undefined, that means it was
          // explicitly set to be so. We allow user code to do that to
          // force variables with default values to remain unset.
          if (ENV[x] === undefined) delete env[x];
          else env[x] = ENV[x];
        }
        var strings = [];
        for (var x in env) {
          strings.push(x + '=' + env[x]);
        }
        getEnvStrings.strings = strings;
      }
      return getEnvStrings.strings;
    }
  
  /** @param {boolean=} dontAddNull */
  function writeAsciiToMemory(str, buffer, dontAddNull) {
      for (var i = 0; i < str.length; ++i) {
        assert(str.charCodeAt(i) === (str.charCodeAt(i) & 0xff));
        HEAP8[((buffer++)>>0)] = str.charCodeAt(i);
      }
      // Null-terminate the pointer to the HEAP.
      if (!dontAddNull) HEAP8[((buffer)>>0)] = 0;
    }
  
  function _environ_get(__environ, environ_buf) {
      var bufSize = 0;
      getEnvStrings().forEach(function(string, i) {
        var ptr = environ_buf + bufSize;
        HEAPU32[(((__environ)+(i*4))>>2)] = ptr;
        writeAsciiToMemory(string, ptr);
        bufSize += string.length + 1;
      });
      return 0;
    }

  
  function _environ_sizes_get(penviron_count, penviron_buf_size) {
      var strings = getEnvStrings();
      HEAPU32[((penviron_count)>>2)] = strings.length;
      var bufSize = 0;
      strings.forEach(function(string) {
        bufSize += string.length + 1;
      });
      HEAPU32[((penviron_buf_size)>>2)] = bufSize;
      return 0;
    }


  function _fd_close(fd) {
  try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      FS.close(stream);
      return 0;
    } catch (e) {
    if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;
    return e.errno;
  }
  }

  /** @param {number=} offset */
  function doReadv(stream, iov, iovcnt, offset) {
      var ret = 0;
      for (var i = 0; i < iovcnt; i++) {
        var ptr = HEAPU32[((iov)>>2)];
        var len = HEAPU32[(((iov)+(4))>>2)];
        iov += 8;
        var curr = FS.read(stream, HEAP8,ptr, len, offset);
        if (curr < 0) return -1;
        ret += curr;
        if (curr < len) break; // nothing more to read
        if (typeof offset !== 'undefined') {
          offset += curr;
        }
      }
      return ret;
    }
  
  function _fd_read(fd, iov, iovcnt, pnum) {
  try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      var num = doReadv(stream, iov, iovcnt);
      HEAPU32[((pnum)>>2)] = num;
      return 0;
    } catch (e) {
    if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;
    return e.errno;
  }
  }

  function convertI32PairToI53Checked(lo, hi) {
      assert(lo == (lo >>> 0) || lo == (lo|0)); // lo should either be a i32 or a u32
      assert(hi === (hi|0));                    // hi should be a i32
      return ((hi + 0x200000) >>> 0 < 0x400001 - !!lo) ? (lo >>> 0) + hi * 4294967296 : NaN;
    }
  
  
  
  
  function _fd_seek(fd, offset_low, offset_high, whence, newOffset) {
  try {
  
      var offset = convertI32PairToI53Checked(offset_low, offset_high); if (isNaN(offset)) return 61;
      var stream = SYSCALLS.getStreamFromFD(fd);
      FS.llseek(stream, offset, whence);
      (tempI64 = [stream.position>>>0,(tempDouble=stream.position,(+(Math.abs(tempDouble))) >= 1.0 ? (tempDouble > 0.0 ? ((Math.min((+(Math.floor((tempDouble)/4294967296.0))), 4294967295.0))|0)>>>0 : (~~((+(Math.ceil((tempDouble - +(((~~(tempDouble)))>>>0))/4294967296.0)))))>>>0) : 0)],HEAP32[((newOffset)>>2)] = tempI64[0],HEAP32[(((newOffset)+(4))>>2)] = tempI64[1]);
      if (stream.getdents && offset === 0 && whence === 0) stream.getdents = null; // reset readdir state
      return 0;
    } catch (e) {
    if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;
    return e.errno;
  }
  }

  /** @param {number=} offset */
  function doWritev(stream, iov, iovcnt, offset) {
      var ret = 0;
      for (var i = 0; i < iovcnt; i++) {
        var ptr = HEAPU32[((iov)>>2)];
        var len = HEAPU32[(((iov)+(4))>>2)];
        iov += 8;
        var curr = FS.write(stream, HEAP8,ptr, len, offset);
        if (curr < 0) return -1;
        ret += curr;
        if (typeof offset !== 'undefined') {
          offset += curr;
        }
      }
      return ret;
    }
  
  function _fd_write(fd, iov, iovcnt, pnum) {
  try {
  
      var stream = SYSCALLS.getStreamFromFD(fd);
      var num = doWritev(stream, iov, iovcnt);
      HEAPU32[((pnum)>>2)] = num;
      return 0;
    } catch (e) {
    if (typeof FS == 'undefined' || !(e.name === 'ErrnoError')) throw e;
    return e.errno;
  }
  }



  function _glBindTexture(target, texture) {
      GLctx.bindTexture(target, GL.textures[texture]);
    }

  function _glBlendFunc(x0, x1) { GLctx['blendFunc'](x0, x1) }

  function _glClear(x0) { GLctx['clear'](x0) }

  function _glClearColor(x0, x1, x2, x3) { GLctx['clearColor'](x0, x1, x2, x3) }

  function _glDeleteTextures(n, textures) {
      for (var i = 0; i < n; i++) {
        var id = HEAP32[(((textures)+(i*4))>>2)];
        var texture = GL.textures[id];
        if (!texture) continue; // GL spec: "glDeleteTextures silently ignores 0s and names that do not correspond to existing textures".
        GLctx.deleteTexture(texture);
        texture.name = 0;
        GL.textures[id] = null;
      }
    }

  function _glDisable(x0) { GLctx['disable'](x0) }

  function _glDrawArrays(mode, first, count) {
      // bind any client-side buffers
      GL.preDrawHandleClientVertexAttribBindings(first + count);
  
      GLctx.drawArrays(mode, first, count);
  
      GL.postDrawHandleClientVertexAttribBindings();
    }


  function _glEnable(x0) { GLctx['enable'](x0) }

  
  function _glGenTextures(n, textures) {
      __glGenObject(n, textures, 'createTexture', GL.textures
        );
    }

  function _glGetError() {
      var error = GLctx.getError() || GL.lastError;
      GL.lastError = 0/*GL_NO_ERROR*/;
      return error;
    }

  
  function _glGetIntegerv(name_, p) {
      emscriptenWebGLGet(name_, p, 0);
    }

  
  function _glGetString(name_) {
      var ret = GL.stringCache[name_];
      if (!ret) {
        switch (name_) {
          case 0x1F03 /* GL_EXTENSIONS */:
            var exts = GLctx.getSupportedExtensions() || []; // .getSupportedExtensions() can return null if context is lost, so coerce to empty array.
            exts = exts.concat(exts.map(function(e) { return "GL_" + e; }));
            ret = stringToNewUTF8(exts.join(' '));
            break;
          case 0x1F00 /* GL_VENDOR */:
          case 0x1F01 /* GL_RENDERER */:
          case 0x9245 /* UNMASKED_VENDOR_WEBGL */:
          case 0x9246 /* UNMASKED_RENDERER_WEBGL */:
            var s = GLctx.getParameter(name_);
            if (!s) {
              GL.recordError(0x500/*GL_INVALID_ENUM*/);
            }
            ret = s && stringToNewUTF8(s);
            break;
  
          case 0x1F02 /* GL_VERSION */:
            var glVersion = GLctx.getParameter(0x1F02 /*GL_VERSION*/);
            // return GLES version string corresponding to the version of the WebGL context
            if (true) glVersion = 'OpenGL ES 3.0 (' + glVersion + ')';
            else
            {
              glVersion = 'OpenGL ES 2.0 (' + glVersion + ')';
            }
            ret = stringToNewUTF8(glVersion);
            break;
          case 0x8B8C /* GL_SHADING_LANGUAGE_VERSION */:
            var glslVersion = GLctx.getParameter(0x8B8C /*GL_SHADING_LANGUAGE_VERSION*/);
            // extract the version number 'N.M' from the string 'WebGL GLSL ES N.M ...'
            var ver_re = /^WebGL GLSL ES ([0-9]\.[0-9][0-9]?)(?:$| .*)/;
            var ver_num = glslVersion.match(ver_re);
            if (ver_num !== null) {
              if (ver_num[1].length == 3) ver_num[1] = ver_num[1] + '0'; // ensure minor version has 2 digits
              glslVersion = 'OpenGL ES GLSL ES ' + ver_num[1] + ' (' + glslVersion + ')';
            }
            ret = stringToNewUTF8(glslVersion);
            break;
          default:
            GL.recordError(0x500/*GL_INVALID_ENUM*/);
            // fall through
        }
        GL.stringCache[name_] = ret;
      }
      return ret;
    }

  function _glLineWidth(x0) { GLctx['lineWidth'](x0) }

  
  
  
  function _glTexImage2D(target, level, internalFormat, width, height, border, format, type, pixels) {
      if (true) {
        // WebGL 2 provides new garbage-free entry points to call to WebGL. Use those always when possible.
        if (GLctx.currentPixelUnpackBufferBinding) {
          GLctx.texImage2D(target, level, internalFormat, width, height, border, format, type, pixels);
        } else if (pixels) {
          var heap = heapObjectForWebGLType(type);
          GLctx.texImage2D(target, level, internalFormat, width, height, border, format, type, heap, pixels >> heapAccessShiftForWebGLHeap(heap));
        } else {
          GLctx.texImage2D(target, level, internalFormat, width, height, border, format, type, null);
        }
        return;
      }
      GLctx.texImage2D(target, level, internalFormat, width, height, border, format, type, pixels ? emscriptenWebGLGetTexPixelData(type, format, width, height, pixels, internalFormat) : null);
    }

  function _glTexParameteri(x0, x1, x2) { GLctx['texParameteri'](x0, x1, x2) }

  function _glViewport(x0, x1, x2, x3) { GLctx['viewport'](x0, x1, x2, x3) }



  function allocateUTF8OnStack(str) {
      var size = lengthBytesUTF8(str) + 1;
      var ret = stackAlloc(size);
      stringToUTF8Array(str, HEAP8, ret, size);
      return ret;
    }



  var FSNode = /** @constructor */ function(parent, name, mode, rdev) {
    if (!parent) {
      parent = this;  // root node sets parent to itself
    }
    this.parent = parent;
    this.mount = parent.mount;
    this.mounted = null;
    this.id = FS.nextInode++;
    this.name = name;
    this.mode = mode;
    this.node_ops = {};
    this.stream_ops = {};
    this.rdev = rdev;
  };
  var readMode = 292/*292*/ | 73/*73*/;
  var writeMode = 146/*146*/;
  Object.defineProperties(FSNode.prototype, {
   read: {
    get: /** @this{FSNode} */function() {
     return (this.mode & readMode) === readMode;
    },
    set: /** @this{FSNode} */function(val) {
     val ? this.mode |= readMode : this.mode &= ~readMode;
    }
   },
   write: {
    get: /** @this{FSNode} */function() {
     return (this.mode & writeMode) === writeMode;
    },
    set: /** @this{FSNode} */function(val) {
     val ? this.mode |= writeMode : this.mode &= ~writeMode;
    }
   },
   isFolder: {
    get: /** @this{FSNode} */function() {
     return FS.isDir(this.mode);
    }
   },
   isDevice: {
    get: /** @this{FSNode} */function() {
     return FS.isChrdev(this.mode);
    }
   }
  });
  FS.FSNode = FSNode;
  FS.staticInit();Module["FS_createPath"] = FS.createPath;Module["FS_createDataFile"] = FS.createDataFile;Module["FS_createPreloadedFile"] = FS.createPreloadedFile;Module["FS_unlink"] = FS.unlink;Module["FS_createLazyFile"] = FS.createLazyFile;Module["FS_createDevice"] = FS.createDevice;;
ERRNO_CODES = {
      'EPERM': 63,
      'ENOENT': 44,
      'ESRCH': 71,
      'EINTR': 27,
      'EIO': 29,
      'ENXIO': 60,
      'E2BIG': 1,
      'ENOEXEC': 45,
      'EBADF': 8,
      'ECHILD': 12,
      'EAGAIN': 6,
      'EWOULDBLOCK': 6,
      'ENOMEM': 48,
      'EACCES': 2,
      'EFAULT': 21,
      'ENOTBLK': 105,
      'EBUSY': 10,
      'EEXIST': 20,
      'EXDEV': 75,
      'ENODEV': 43,
      'ENOTDIR': 54,
      'EISDIR': 31,
      'EINVAL': 28,
      'ENFILE': 41,
      'EMFILE': 33,
      'ENOTTY': 59,
      'ETXTBSY': 74,
      'EFBIG': 22,
      'ENOSPC': 51,
      'ESPIPE': 70,
      'EROFS': 69,
      'EMLINK': 34,
      'EPIPE': 64,
      'EDOM': 18,
      'ERANGE': 68,
      'ENOMSG': 49,
      'EIDRM': 24,
      'ECHRNG': 106,
      'EL2NSYNC': 156,
      'EL3HLT': 107,
      'EL3RST': 108,
      'ELNRNG': 109,
      'EUNATCH': 110,
      'ENOCSI': 111,
      'EL2HLT': 112,
      'EDEADLK': 16,
      'ENOLCK': 46,
      'EBADE': 113,
      'EBADR': 114,
      'EXFULL': 115,
      'ENOANO': 104,
      'EBADRQC': 103,
      'EBADSLT': 102,
      'EDEADLOCK': 16,
      'EBFONT': 101,
      'ENOSTR': 100,
      'ENODATA': 116,
      'ETIME': 117,
      'ENOSR': 118,
      'ENONET': 119,
      'ENOPKG': 120,
      'EREMOTE': 121,
      'ENOLINK': 47,
      'EADV': 122,
      'ESRMNT': 123,
      'ECOMM': 124,
      'EPROTO': 65,
      'EMULTIHOP': 36,
      'EDOTDOT': 125,
      'EBADMSG': 9,
      'ENOTUNIQ': 126,
      'EBADFD': 127,
      'EREMCHG': 128,
      'ELIBACC': 129,
      'ELIBBAD': 130,
      'ELIBSCN': 131,
      'ELIBMAX': 132,
      'ELIBEXEC': 133,
      'ENOSYS': 52,
      'ENOTEMPTY': 55,
      'ENAMETOOLONG': 37,
      'ELOOP': 32,
      'EOPNOTSUPP': 138,
      'EPFNOSUPPORT': 139,
      'ECONNRESET': 15,
      'ENOBUFS': 42,
      'EAFNOSUPPORT': 5,
      'EPROTOTYPE': 67,
      'ENOTSOCK': 57,
      'ENOPROTOOPT': 50,
      'ESHUTDOWN': 140,
      'ECONNREFUSED': 14,
      'EADDRINUSE': 3,
      'ECONNABORTED': 13,
      'ENETUNREACH': 40,
      'ENETDOWN': 38,
      'ETIMEDOUT': 73,
      'EHOSTDOWN': 142,
      'EHOSTUNREACH': 23,
      'EINPROGRESS': 26,
      'EALREADY': 7,
      'EDESTADDRREQ': 17,
      'EMSGSIZE': 35,
      'EPROTONOSUPPORT': 66,
      'ESOCKTNOSUPPORT': 137,
      'EADDRNOTAVAIL': 4,
      'ENETRESET': 39,
      'EISCONN': 30,
      'ENOTCONN': 53,
      'ETOOMANYREFS': 141,
      'EUSERS': 136,
      'EDQUOT': 19,
      'ESTALE': 72,
      'ENOTSUP': 138,
      'ENOMEDIUM': 148,
      'EILSEQ': 25,
      'EOVERFLOW': 61,
      'ECANCELED': 11,
      'ENOTRECOVERABLE': 56,
      'EOWNERDEAD': 62,
      'ESTRPIPE': 135,
    };;

      // exports
      Module["requestFullscreen"] = function Module_requestFullscreen(lockPointer, resizeCanvas) { Browser.requestFullscreen(lockPointer, resizeCanvas) };
      Module["requestFullScreen"] = function Module_requestFullScreen() { Browser.requestFullScreen() };
      Module["requestAnimationFrame"] = function Module_requestAnimationFrame(func) { Browser.requestAnimationFrame(func) };
      Module["setCanvasSize"] = function Module_setCanvasSize(width, height, noUpdates) { Browser.setCanvasSize(width, height, noUpdates) };
      Module["pauseMainLoop"] = function Module_pauseMainLoop() { Browser.mainLoop.pause() };
      Module["resumeMainLoop"] = function Module_resumeMainLoop() { Browser.mainLoop.resume() };
      Module["getUserMedia"] = function Module_getUserMedia() { Browser.getUserMedia() };
      Module["createContext"] = function Module_createContext(canvas, useWebGL, setInModule, webGLContextAttributes) { return Browser.createContext(canvas, useWebGL, setInModule, webGLContextAttributes) };
      var preloadedImages = {};
      var preloadedAudios = {};;
var GLctx;;
for (var i = 0; i < 32; ++i) tempFixedLengthArray.push(new Array(i));;
// include: base64Utils.js
// Copied from https://github.com/strophe/strophejs/blob/e06d027/src/polyfills.js#L149

// This code was written by Tyler Akins and has been placed in the
// public domain.  It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com

/**
 * Decodes a base64 string.
 * @param {string} input The string to decode.
 */
var decodeBase64 = typeof atob == 'function' ? atob : function (input) {
  var keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

  var output = '';
  var chr1, chr2, chr3;
  var enc1, enc2, enc3, enc4;
  var i = 0;
  // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
  input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '');
  do {
    enc1 = keyStr.indexOf(input.charAt(i++));
    enc2 = keyStr.indexOf(input.charAt(i++));
    enc3 = keyStr.indexOf(input.charAt(i++));
    enc4 = keyStr.indexOf(input.charAt(i++));

    chr1 = (enc1 << 2) | (enc2 >> 4);
    chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
    chr3 = ((enc3 & 3) << 6) | enc4;

    output = output + String.fromCharCode(chr1);

    if (enc3 !== 64) {
      output = output + String.fromCharCode(chr2);
    }
    if (enc4 !== 64) {
      output = output + String.fromCharCode(chr3);
    }
  } while (i < input.length);
  return output;
};

// Converts a string of base64 into a byte array.
// Throws error on invalid input.
function intArrayFromBase64(s) {
  if (typeof ENVIRONMENT_IS_NODE == 'boolean' && ENVIRONMENT_IS_NODE) {
    var buf = Buffer.from(s, 'base64');
    return new Uint8Array(buf['buffer'], buf['byteOffset'], buf['byteLength']);
  }

  try {
    var decoded = decodeBase64(s);
    var bytes = new Uint8Array(decoded.length);
    for (var i = 0 ; i < decoded.length ; ++i) {
      bytes[i] = decoded.charCodeAt(i);
    }
    return bytes;
  } catch (_) {
    throw new Error('Converting base64 string to bytes failed.');
  }
}

// If filename is a base64 data URI, parses and returns data (Buffer on node,
// Uint8Array otherwise). If filename is not a base64 data URI, returns undefined.
function tryParseAsDataURI(filename) {
  if (!isDataURI(filename)) {
    return;
  }

  return intArrayFromBase64(filename.slice(dataURIPrefix.length));
}


// end include: base64Utils.js
function checkIncomingModuleAPI() {
  ignoredModuleProp('fetchSettings');
}
var wasmImports = {
  "__assert_fail": ___assert_fail,
  "__syscall_fcntl64": ___syscall_fcntl64,
  "__syscall_ioctl": ___syscall_ioctl,
  "__syscall_openat": ___syscall_openat,
  "__syscall_recvfrom": ___syscall_recvfrom,
  "__syscall_sendto": ___syscall_sendto,
  "_emscripten_get_now_is_monotonic": __emscripten_get_now_is_monotonic,
  "_emscripten_throw_longjmp": __emscripten_throw_longjmp,
  "abort": _abort,
  "eglBindAPI": _eglBindAPI,
  "eglChooseConfig": _eglChooseConfig,
  "eglCreateContext": _eglCreateContext,
  "eglCreateWindowSurface": _eglCreateWindowSurface,
  "eglDestroyContext": _eglDestroyContext,
  "eglDestroySurface": _eglDestroySurface,
  "eglGetConfigAttrib": _eglGetConfigAttrib,
  "eglGetDisplay": _eglGetDisplay,
  "eglGetError": _eglGetError,
  "eglInitialize": _eglInitialize,
  "eglMakeCurrent": _eglMakeCurrent,
  "eglQueryString": _eglQueryString,
  "eglSwapBuffers": _eglSwapBuffers,
  "eglSwapInterval": _eglSwapInterval,
  "eglTerminate": _eglTerminate,
  "eglWaitGL": _eglWaitGL,
  "eglWaitNative": _eglWaitNative,
  "emscripten_asm_const_int": _emscripten_asm_const_int,
  "emscripten_asm_const_int_sync_on_main_thread": _emscripten_asm_const_int_sync_on_main_thread,
  "emscripten_cancel_main_loop": _emscripten_cancel_main_loop,
  "emscripten_date_now": _emscripten_date_now,
  "emscripten_exit_fullscreen": _emscripten_exit_fullscreen,
  "emscripten_exit_pointerlock": _emscripten_exit_pointerlock,
  "emscripten_get_device_pixel_ratio": _emscripten_get_device_pixel_ratio,
  "emscripten_get_element_css_size": _emscripten_get_element_css_size,
  "emscripten_get_gamepad_status": _emscripten_get_gamepad_status,
  "emscripten_get_now": _emscripten_get_now,
  "emscripten_get_num_gamepads": _emscripten_get_num_gamepads,
  "emscripten_get_preloaded_image_data": _emscripten_get_preloaded_image_data,
  "emscripten_get_preloaded_image_data_from_FILE": _emscripten_get_preloaded_image_data_from_FILE,
  "emscripten_get_screen_size": _emscripten_get_screen_size,
  "emscripten_glActiveTexture": _emscripten_glActiveTexture,
  "emscripten_glAttachShader": _emscripten_glAttachShader,
  "emscripten_glBeginQuery": _emscripten_glBeginQuery,
  "emscripten_glBeginQueryEXT": _emscripten_glBeginQueryEXT,
  "emscripten_glBeginTransformFeedback": _emscripten_glBeginTransformFeedback,
  "emscripten_glBindAttribLocation": _emscripten_glBindAttribLocation,
  "emscripten_glBindBuffer": _emscripten_glBindBuffer,
  "emscripten_glBindBufferBase": _emscripten_glBindBufferBase,
  "emscripten_glBindBufferRange": _emscripten_glBindBufferRange,
  "emscripten_glBindFramebuffer": _emscripten_glBindFramebuffer,
  "emscripten_glBindRenderbuffer": _emscripten_glBindRenderbuffer,
  "emscripten_glBindSampler": _emscripten_glBindSampler,
  "emscripten_glBindTexture": _emscripten_glBindTexture,
  "emscripten_glBindTransformFeedback": _emscripten_glBindTransformFeedback,
  "emscripten_glBindVertexArray": _emscripten_glBindVertexArray,
  "emscripten_glBindVertexArrayOES": _emscripten_glBindVertexArrayOES,
  "emscripten_glBlendColor": _emscripten_glBlendColor,
  "emscripten_glBlendEquation": _emscripten_glBlendEquation,
  "emscripten_glBlendEquationSeparate": _emscripten_glBlendEquationSeparate,
  "emscripten_glBlendFunc": _emscripten_glBlendFunc,
  "emscripten_glBlendFuncSeparate": _emscripten_glBlendFuncSeparate,
  "emscripten_glBlitFramebuffer": _emscripten_glBlitFramebuffer,
  "emscripten_glBufferData": _emscripten_glBufferData,
  "emscripten_glBufferSubData": _emscripten_glBufferSubData,
  "emscripten_glCheckFramebufferStatus": _emscripten_glCheckFramebufferStatus,
  "emscripten_glClear": _emscripten_glClear,
  "emscripten_glClearBufferfi": _emscripten_glClearBufferfi,
  "emscripten_glClearBufferfv": _emscripten_glClearBufferfv,
  "emscripten_glClearBufferiv": _emscripten_glClearBufferiv,
  "emscripten_glClearBufferuiv": _emscripten_glClearBufferuiv,
  "emscripten_glClearColor": _emscripten_glClearColor,
  "emscripten_glClearDepthf": _emscripten_glClearDepthf,
  "emscripten_glClearStencil": _emscripten_glClearStencil,
  "emscripten_glClientWaitSync": _emscripten_glClientWaitSync,
  "emscripten_glColorMask": _emscripten_glColorMask,
  "emscripten_glCompileShader": _emscripten_glCompileShader,
  "emscripten_glCompressedTexImage2D": _emscripten_glCompressedTexImage2D,
  "emscripten_glCompressedTexImage3D": _emscripten_glCompressedTexImage3D,
  "emscripten_glCompressedTexSubImage2D": _emscripten_glCompressedTexSubImage2D,
  "emscripten_glCompressedTexSubImage3D": _emscripten_glCompressedTexSubImage3D,
  "emscripten_glCopyBufferSubData": _emscripten_glCopyBufferSubData,
  "emscripten_glCopyTexImage2D": _emscripten_glCopyTexImage2D,
  "emscripten_glCopyTexSubImage2D": _emscripten_glCopyTexSubImage2D,
  "emscripten_glCopyTexSubImage3D": _emscripten_glCopyTexSubImage3D,
  "emscripten_glCreateProgram": _emscripten_glCreateProgram,
  "emscripten_glCreateShader": _emscripten_glCreateShader,
  "emscripten_glCullFace": _emscripten_glCullFace,
  "emscripten_glDeleteBuffers": _emscripten_glDeleteBuffers,
  "emscripten_glDeleteFramebuffers": _emscripten_glDeleteFramebuffers,
  "emscripten_glDeleteProgram": _emscripten_glDeleteProgram,
  "emscripten_glDeleteQueries": _emscripten_glDeleteQueries,
  "emscripten_glDeleteQueriesEXT": _emscripten_glDeleteQueriesEXT,
  "emscripten_glDeleteRenderbuffers": _emscripten_glDeleteRenderbuffers,
  "emscripten_glDeleteSamplers": _emscripten_glDeleteSamplers,
  "emscripten_glDeleteShader": _emscripten_glDeleteShader,
  "emscripten_glDeleteSync": _emscripten_glDeleteSync,
  "emscripten_glDeleteTextures": _emscripten_glDeleteTextures,
  "emscripten_glDeleteTransformFeedbacks": _emscripten_glDeleteTransformFeedbacks,
  "emscripten_glDeleteVertexArrays": _emscripten_glDeleteVertexArrays,
  "emscripten_glDeleteVertexArraysOES": _emscripten_glDeleteVertexArraysOES,
  "emscripten_glDepthFunc": _emscripten_glDepthFunc,
  "emscripten_glDepthMask": _emscripten_glDepthMask,
  "emscripten_glDepthRangef": _emscripten_glDepthRangef,
  "emscripten_glDetachShader": _emscripten_glDetachShader,
  "emscripten_glDisable": _emscripten_glDisable,
  "emscripten_glDisableVertexAttribArray": _emscripten_glDisableVertexAttribArray,
  "emscripten_glDrawArrays": _emscripten_glDrawArrays,
  "emscripten_glDrawArraysInstanced": _emscripten_glDrawArraysInstanced,
  "emscripten_glDrawArraysInstancedANGLE": _emscripten_glDrawArraysInstancedANGLE,
  "emscripten_glDrawArraysInstancedARB": _emscripten_glDrawArraysInstancedARB,
  "emscripten_glDrawArraysInstancedEXT": _emscripten_glDrawArraysInstancedEXT,
  "emscripten_glDrawArraysInstancedNV": _emscripten_glDrawArraysInstancedNV,
  "emscripten_glDrawBuffers": _emscripten_glDrawBuffers,
  "emscripten_glDrawBuffersEXT": _emscripten_glDrawBuffersEXT,
  "emscripten_glDrawBuffersWEBGL": _emscripten_glDrawBuffersWEBGL,
  "emscripten_glDrawElements": _emscripten_glDrawElements,
  "emscripten_glDrawElementsInstanced": _emscripten_glDrawElementsInstanced,
  "emscripten_glDrawElementsInstancedANGLE": _emscripten_glDrawElementsInstancedANGLE,
  "emscripten_glDrawElementsInstancedARB": _emscripten_glDrawElementsInstancedARB,
  "emscripten_glDrawElementsInstancedEXT": _emscripten_glDrawElementsInstancedEXT,
  "emscripten_glDrawElementsInstancedNV": _emscripten_glDrawElementsInstancedNV,
  "emscripten_glDrawRangeElements": _emscripten_glDrawRangeElements,
  "emscripten_glEnable": _emscripten_glEnable,
  "emscripten_glEnableVertexAttribArray": _emscripten_glEnableVertexAttribArray,
  "emscripten_glEndQuery": _emscripten_glEndQuery,
  "emscripten_glEndQueryEXT": _emscripten_glEndQueryEXT,
  "emscripten_glEndTransformFeedback": _emscripten_glEndTransformFeedback,
  "emscripten_glFenceSync": _emscripten_glFenceSync,
  "emscripten_glFinish": _emscripten_glFinish,
  "emscripten_glFlush": _emscripten_glFlush,
  "emscripten_glFlushMappedBufferRange": _emscripten_glFlushMappedBufferRange,
  "emscripten_glFramebufferRenderbuffer": _emscripten_glFramebufferRenderbuffer,
  "emscripten_glFramebufferTexture2D": _emscripten_glFramebufferTexture2D,
  "emscripten_glFramebufferTextureLayer": _emscripten_glFramebufferTextureLayer,
  "emscripten_glFrontFace": _emscripten_glFrontFace,
  "emscripten_glGenBuffers": _emscripten_glGenBuffers,
  "emscripten_glGenFramebuffers": _emscripten_glGenFramebuffers,
  "emscripten_glGenQueries": _emscripten_glGenQueries,
  "emscripten_glGenQueriesEXT": _emscripten_glGenQueriesEXT,
  "emscripten_glGenRenderbuffers": _emscripten_glGenRenderbuffers,
  "emscripten_glGenSamplers": _emscripten_glGenSamplers,
  "emscripten_glGenTextures": _emscripten_glGenTextures,
  "emscripten_glGenTransformFeedbacks": _emscripten_glGenTransformFeedbacks,
  "emscripten_glGenVertexArrays": _emscripten_glGenVertexArrays,
  "emscripten_glGenVertexArraysOES": _emscripten_glGenVertexArraysOES,
  "emscripten_glGenerateMipmap": _emscripten_glGenerateMipmap,
  "emscripten_glGetActiveAttrib": _emscripten_glGetActiveAttrib,
  "emscripten_glGetActiveUniform": _emscripten_glGetActiveUniform,
  "emscripten_glGetActiveUniformBlockName": _emscripten_glGetActiveUniformBlockName,
  "emscripten_glGetActiveUniformBlockiv": _emscripten_glGetActiveUniformBlockiv,
  "emscripten_glGetActiveUniformsiv": _emscripten_glGetActiveUniformsiv,
  "emscripten_glGetAttachedShaders": _emscripten_glGetAttachedShaders,
  "emscripten_glGetAttribLocation": _emscripten_glGetAttribLocation,
  "emscripten_glGetBooleanv": _emscripten_glGetBooleanv,
  "emscripten_glGetBufferParameteri64v": _emscripten_glGetBufferParameteri64v,
  "emscripten_glGetBufferParameteriv": _emscripten_glGetBufferParameteriv,
  "emscripten_glGetBufferPointerv": _emscripten_glGetBufferPointerv,
  "emscripten_glGetError": _emscripten_glGetError,
  "emscripten_glGetFloatv": _emscripten_glGetFloatv,
  "emscripten_glGetFragDataLocation": _emscripten_glGetFragDataLocation,
  "emscripten_glGetFramebufferAttachmentParameteriv": _emscripten_glGetFramebufferAttachmentParameteriv,
  "emscripten_glGetInteger64i_v": _emscripten_glGetInteger64i_v,
  "emscripten_glGetInteger64v": _emscripten_glGetInteger64v,
  "emscripten_glGetIntegeri_v": _emscripten_glGetIntegeri_v,
  "emscripten_glGetIntegerv": _emscripten_glGetIntegerv,
  "emscripten_glGetInternalformativ": _emscripten_glGetInternalformativ,
  "emscripten_glGetProgramBinary": _emscripten_glGetProgramBinary,
  "emscripten_glGetProgramInfoLog": _emscripten_glGetProgramInfoLog,
  "emscripten_glGetProgramiv": _emscripten_glGetProgramiv,
  "emscripten_glGetQueryObjecti64vEXT": _emscripten_glGetQueryObjecti64vEXT,
  "emscripten_glGetQueryObjectivEXT": _emscripten_glGetQueryObjectivEXT,
  "emscripten_glGetQueryObjectui64vEXT": _emscripten_glGetQueryObjectui64vEXT,
  "emscripten_glGetQueryObjectuiv": _emscripten_glGetQueryObjectuiv,
  "emscripten_glGetQueryObjectuivEXT": _emscripten_glGetQueryObjectuivEXT,
  "emscripten_glGetQueryiv": _emscripten_glGetQueryiv,
  "emscripten_glGetQueryivEXT": _emscripten_glGetQueryivEXT,
  "emscripten_glGetRenderbufferParameteriv": _emscripten_glGetRenderbufferParameteriv,
  "emscripten_glGetSamplerParameterfv": _emscripten_glGetSamplerParameterfv,
  "emscripten_glGetSamplerParameteriv": _emscripten_glGetSamplerParameteriv,
  "emscripten_glGetShaderInfoLog": _emscripten_glGetShaderInfoLog,
  "emscripten_glGetShaderPrecisionFormat": _emscripten_glGetShaderPrecisionFormat,
  "emscripten_glGetShaderSource": _emscripten_glGetShaderSource,
  "emscripten_glGetShaderiv": _emscripten_glGetShaderiv,
  "emscripten_glGetString": _emscripten_glGetString,
  "emscripten_glGetStringi": _emscripten_glGetStringi,
  "emscripten_glGetSynciv": _emscripten_glGetSynciv,
  "emscripten_glGetTexParameterfv": _emscripten_glGetTexParameterfv,
  "emscripten_glGetTexParameteriv": _emscripten_glGetTexParameteriv,
  "emscripten_glGetTransformFeedbackVarying": _emscripten_glGetTransformFeedbackVarying,
  "emscripten_glGetUniformBlockIndex": _emscripten_glGetUniformBlockIndex,
  "emscripten_glGetUniformIndices": _emscripten_glGetUniformIndices,
  "emscripten_glGetUniformLocation": _emscripten_glGetUniformLocation,
  "emscripten_glGetUniformfv": _emscripten_glGetUniformfv,
  "emscripten_glGetUniformiv": _emscripten_glGetUniformiv,
  "emscripten_glGetUniformuiv": _emscripten_glGetUniformuiv,
  "emscripten_glGetVertexAttribIiv": _emscripten_glGetVertexAttribIiv,
  "emscripten_glGetVertexAttribIuiv": _emscripten_glGetVertexAttribIuiv,
  "emscripten_glGetVertexAttribPointerv": _emscripten_glGetVertexAttribPointerv,
  "emscripten_glGetVertexAttribfv": _emscripten_glGetVertexAttribfv,
  "emscripten_glGetVertexAttribiv": _emscripten_glGetVertexAttribiv,
  "emscripten_glHint": _emscripten_glHint,
  "emscripten_glInvalidateFramebuffer": _emscripten_glInvalidateFramebuffer,
  "emscripten_glInvalidateSubFramebuffer": _emscripten_glInvalidateSubFramebuffer,
  "emscripten_glIsBuffer": _emscripten_glIsBuffer,
  "emscripten_glIsEnabled": _emscripten_glIsEnabled,
  "emscripten_glIsFramebuffer": _emscripten_glIsFramebuffer,
  "emscripten_glIsProgram": _emscripten_glIsProgram,
  "emscripten_glIsQuery": _emscripten_glIsQuery,
  "emscripten_glIsQueryEXT": _emscripten_glIsQueryEXT,
  "emscripten_glIsRenderbuffer": _emscripten_glIsRenderbuffer,
  "emscripten_glIsSampler": _emscripten_glIsSampler,
  "emscripten_glIsShader": _emscripten_glIsShader,
  "emscripten_glIsSync": _emscripten_glIsSync,
  "emscripten_glIsTexture": _emscripten_glIsTexture,
  "emscripten_glIsTransformFeedback": _emscripten_glIsTransformFeedback,
  "emscripten_glIsVertexArray": _emscripten_glIsVertexArray,
  "emscripten_glIsVertexArrayOES": _emscripten_glIsVertexArrayOES,
  "emscripten_glLineWidth": _emscripten_glLineWidth,
  "emscripten_glLinkProgram": _emscripten_glLinkProgram,
  "emscripten_glMapBufferRange": _emscripten_glMapBufferRange,
  "emscripten_glPauseTransformFeedback": _emscripten_glPauseTransformFeedback,
  "emscripten_glPixelStorei": _emscripten_glPixelStorei,
  "emscripten_glPolygonOffset": _emscripten_glPolygonOffset,
  "emscripten_glProgramBinary": _emscripten_glProgramBinary,
  "emscripten_glProgramParameteri": _emscripten_glProgramParameteri,
  "emscripten_glQueryCounterEXT": _emscripten_glQueryCounterEXT,
  "emscripten_glReadBuffer": _emscripten_glReadBuffer,
  "emscripten_glReadPixels": _emscripten_glReadPixels,
  "emscripten_glReleaseShaderCompiler": _emscripten_glReleaseShaderCompiler,
  "emscripten_glRenderbufferStorage": _emscripten_glRenderbufferStorage,
  "emscripten_glRenderbufferStorageMultisample": _emscripten_glRenderbufferStorageMultisample,
  "emscripten_glResumeTransformFeedback": _emscripten_glResumeTransformFeedback,
  "emscripten_glSampleCoverage": _emscripten_glSampleCoverage,
  "emscripten_glSamplerParameterf": _emscripten_glSamplerParameterf,
  "emscripten_glSamplerParameterfv": _emscripten_glSamplerParameterfv,
  "emscripten_glSamplerParameteri": _emscripten_glSamplerParameteri,
  "emscripten_glSamplerParameteriv": _emscripten_glSamplerParameteriv,
  "emscripten_glScissor": _emscripten_glScissor,
  "emscripten_glShaderBinary": _emscripten_glShaderBinary,
  "emscripten_glShaderSource": _emscripten_glShaderSource,
  "emscripten_glStencilFunc": _emscripten_glStencilFunc,
  "emscripten_glStencilFuncSeparate": _emscripten_glStencilFuncSeparate,
  "emscripten_glStencilMask": _emscripten_glStencilMask,
  "emscripten_glStencilMaskSeparate": _emscripten_glStencilMaskSeparate,
  "emscripten_glStencilOp": _emscripten_glStencilOp,
  "emscripten_glStencilOpSeparate": _emscripten_glStencilOpSeparate,
  "emscripten_glTexImage2D": _emscripten_glTexImage2D,
  "emscripten_glTexImage3D": _emscripten_glTexImage3D,
  "emscripten_glTexParameterf": _emscripten_glTexParameterf,
  "emscripten_glTexParameterfv": _emscripten_glTexParameterfv,
  "emscripten_glTexParameteri": _emscripten_glTexParameteri,
  "emscripten_glTexParameteriv": _emscripten_glTexParameteriv,
  "emscripten_glTexStorage2D": _emscripten_glTexStorage2D,
  "emscripten_glTexStorage3D": _emscripten_glTexStorage3D,
  "emscripten_glTexSubImage2D": _emscripten_glTexSubImage2D,
  "emscripten_glTexSubImage3D": _emscripten_glTexSubImage3D,
  "emscripten_glTransformFeedbackVaryings": _emscripten_glTransformFeedbackVaryings,
  "emscripten_glUniform1f": _emscripten_glUniform1f,
  "emscripten_glUniform1fv": _emscripten_glUniform1fv,
  "emscripten_glUniform1i": _emscripten_glUniform1i,
  "emscripten_glUniform1iv": _emscripten_glUniform1iv,
  "emscripten_glUniform1ui": _emscripten_glUniform1ui,
  "emscripten_glUniform1uiv": _emscripten_glUniform1uiv,
  "emscripten_glUniform2f": _emscripten_glUniform2f,
  "emscripten_glUniform2fv": _emscripten_glUniform2fv,
  "emscripten_glUniform2i": _emscripten_glUniform2i,
  "emscripten_glUniform2iv": _emscripten_glUniform2iv,
  "emscripten_glUniform2ui": _emscripten_glUniform2ui,
  "emscripten_glUniform2uiv": _emscripten_glUniform2uiv,
  "emscripten_glUniform3f": _emscripten_glUniform3f,
  "emscripten_glUniform3fv": _emscripten_glUniform3fv,
  "emscripten_glUniform3i": _emscripten_glUniform3i,
  "emscripten_glUniform3iv": _emscripten_glUniform3iv,
  "emscripten_glUniform3ui": _emscripten_glUniform3ui,
  "emscripten_glUniform3uiv": _emscripten_glUniform3uiv,
  "emscripten_glUniform4f": _emscripten_glUniform4f,
  "emscripten_glUniform4fv": _emscripten_glUniform4fv,
  "emscripten_glUniform4i": _emscripten_glUniform4i,
  "emscripten_glUniform4iv": _emscripten_glUniform4iv,
  "emscripten_glUniform4ui": _emscripten_glUniform4ui,
  "emscripten_glUniform4uiv": _emscripten_glUniform4uiv,
  "emscripten_glUniformBlockBinding": _emscripten_glUniformBlockBinding,
  "emscripten_glUniformMatrix2fv": _emscripten_glUniformMatrix2fv,
  "emscripten_glUniformMatrix2x3fv": _emscripten_glUniformMatrix2x3fv,
  "emscripten_glUniformMatrix2x4fv": _emscripten_glUniformMatrix2x4fv,
  "emscripten_glUniformMatrix3fv": _emscripten_glUniformMatrix3fv,
  "emscripten_glUniformMatrix3x2fv": _emscripten_glUniformMatrix3x2fv,
  "emscripten_glUniformMatrix3x4fv": _emscripten_glUniformMatrix3x4fv,
  "emscripten_glUniformMatrix4fv": _emscripten_glUniformMatrix4fv,
  "emscripten_glUniformMatrix4x2fv": _emscripten_glUniformMatrix4x2fv,
  "emscripten_glUniformMatrix4x3fv": _emscripten_glUniformMatrix4x3fv,
  "emscripten_glUnmapBuffer": _emscripten_glUnmapBuffer,
  "emscripten_glUseProgram": _emscripten_glUseProgram,
  "emscripten_glValidateProgram": _emscripten_glValidateProgram,
  "emscripten_glVertexAttrib1f": _emscripten_glVertexAttrib1f,
  "emscripten_glVertexAttrib1fv": _emscripten_glVertexAttrib1fv,
  "emscripten_glVertexAttrib2f": _emscripten_glVertexAttrib2f,
  "emscripten_glVertexAttrib2fv": _emscripten_glVertexAttrib2fv,
  "emscripten_glVertexAttrib3f": _emscripten_glVertexAttrib3f,
  "emscripten_glVertexAttrib3fv": _emscripten_glVertexAttrib3fv,
  "emscripten_glVertexAttrib4f": _emscripten_glVertexAttrib4f,
  "emscripten_glVertexAttrib4fv": _emscripten_glVertexAttrib4fv,
  "emscripten_glVertexAttribDivisor": _emscripten_glVertexAttribDivisor,
  "emscripten_glVertexAttribDivisorANGLE": _emscripten_glVertexAttribDivisorANGLE,
  "emscripten_glVertexAttribDivisorARB": _emscripten_glVertexAttribDivisorARB,
  "emscripten_glVertexAttribDivisorEXT": _emscripten_glVertexAttribDivisorEXT,
  "emscripten_glVertexAttribDivisorNV": _emscripten_glVertexAttribDivisorNV,
  "emscripten_glVertexAttribI4i": _emscripten_glVertexAttribI4i,
  "emscripten_glVertexAttribI4iv": _emscripten_glVertexAttribI4iv,
  "emscripten_glVertexAttribI4ui": _emscripten_glVertexAttribI4ui,
  "emscripten_glVertexAttribI4uiv": _emscripten_glVertexAttribI4uiv,
  "emscripten_glVertexAttribIPointer": _emscripten_glVertexAttribIPointer,
  "emscripten_glVertexAttribPointer": _emscripten_glVertexAttribPointer,
  "emscripten_glViewport": _emscripten_glViewport,
  "emscripten_glWaitSync": _emscripten_glWaitSync,
  "emscripten_has_asyncify": _emscripten_has_asyncify,
  "emscripten_memcpy_big": _emscripten_memcpy_big,
  "emscripten_request_fullscreen_strategy": _emscripten_request_fullscreen_strategy,
  "emscripten_request_pointerlock": _emscripten_request_pointerlock,
  "emscripten_resize_heap": _emscripten_resize_heap,
  "emscripten_sample_gamepad_data": _emscripten_sample_gamepad_data,
  "emscripten_set_beforeunload_callback_on_thread": _emscripten_set_beforeunload_callback_on_thread,
  "emscripten_set_blur_callback_on_thread": _emscripten_set_blur_callback_on_thread,
  "emscripten_set_canvas_element_size": _emscripten_set_canvas_element_size,
  "emscripten_set_element_css_size": _emscripten_set_element_css_size,
  "emscripten_set_focus_callback_on_thread": _emscripten_set_focus_callback_on_thread,
  "emscripten_set_fullscreenchange_callback_on_thread": _emscripten_set_fullscreenchange_callback_on_thread,
  "emscripten_set_gamepadconnected_callback_on_thread": _emscripten_set_gamepadconnected_callback_on_thread,
  "emscripten_set_gamepaddisconnected_callback_on_thread": _emscripten_set_gamepaddisconnected_callback_on_thread,
  "emscripten_set_keydown_callback_on_thread": _emscripten_set_keydown_callback_on_thread,
  "emscripten_set_keypress_callback_on_thread": _emscripten_set_keypress_callback_on_thread,
  "emscripten_set_keyup_callback_on_thread": _emscripten_set_keyup_callback_on_thread,
  "emscripten_set_main_loop": _emscripten_set_main_loop,
  "emscripten_set_mousedown_callback_on_thread": _emscripten_set_mousedown_callback_on_thread,
  "emscripten_set_mouseenter_callback_on_thread": _emscripten_set_mouseenter_callback_on_thread,
  "emscripten_set_mouseleave_callback_on_thread": _emscripten_set_mouseleave_callback_on_thread,
  "emscripten_set_mousemove_callback_on_thread": _emscripten_set_mousemove_callback_on_thread,
  "emscripten_set_mouseup_callback_on_thread": _emscripten_set_mouseup_callback_on_thread,
  "emscripten_set_pointerlockchange_callback_on_thread": _emscripten_set_pointerlockchange_callback_on_thread,
  "emscripten_set_resize_callback_on_thread": _emscripten_set_resize_callback_on_thread,
  "emscripten_set_touchcancel_callback_on_thread": _emscripten_set_touchcancel_callback_on_thread,
  "emscripten_set_touchend_callback_on_thread": _emscripten_set_touchend_callback_on_thread,
  "emscripten_set_touchmove_callback_on_thread": _emscripten_set_touchmove_callback_on_thread,
  "emscripten_set_touchstart_callback_on_thread": _emscripten_set_touchstart_callback_on_thread,
  "emscripten_set_visibilitychange_callback_on_thread": _emscripten_set_visibilitychange_callback_on_thread,
  "emscripten_set_wheel_callback_on_thread": _emscripten_set_wheel_callback_on_thread,
  "emscripten_set_window_title": _emscripten_set_window_title,
  "emscripten_sleep": _emscripten_sleep,
  "environ_get": _environ_get,
  "environ_sizes_get": _environ_sizes_get,
  "exit": _exit,
  "fd_close": _fd_close,
  "fd_read": _fd_read,
  "fd_seek": _fd_seek,
  "fd_write": _fd_write,
  "get_canvas_height": get_canvas_height,
  "get_canvas_width": get_canvas_width,
  "glBindTexture": _glBindTexture,
  "glBlendFunc": _glBlendFunc,
  "glClear": _glClear,
  "glClearColor": _glClearColor,
  "glDeleteTextures": _glDeleteTextures,
  "glDisable": _glDisable,
  "glDrawArrays": _glDrawArrays,
  "glDrawElements": _glDrawElements,
  "glEnable": _glEnable,
  "glGenTextures": _glGenTextures,
  "glGetError": _glGetError,
  "glGetIntegerv": _glGetIntegerv,
  "glGetString": _glGetString,
  "glLineWidth": _glLineWidth,
  "glTexImage2D": _glTexImage2D,
  "glTexParameteri": _glTexParameteri,
  "glViewport": _glViewport,
  "invoke_i": invoke_i,
  "invoke_ii": invoke_ii,
  "invoke_iii": invoke_iii,
  "invoke_iiii": invoke_iiii,
  "invoke_iiiii": invoke_iiiii,
  "invoke_iiiiii": invoke_iiiiii,
  "invoke_iiiiiiiii": invoke_iiiiiiiii,
  "invoke_iiiiiiiiii": invoke_iiiiiiiiii,
  "invoke_ji": invoke_ji,
  "invoke_jiji": invoke_jiji,
  "invoke_vi": invoke_vi,
  "invoke_vii": invoke_vii,
  "invoke_viii": invoke_viii,
  "invoke_viiii": invoke_viiii
};
var asm = createWasm();
/** @type {function(...*):?} */
var ___wasm_call_ctors = createExportWrapper("__wasm_call_ctors");
/** @type {function(...*):?} */
var _malloc = createExportWrapper("malloc");
/** @type {function(...*):?} */
var _free = createExportWrapper("free");
/** @type {function(...*):?} */
var _memcpy = createExportWrapper("memcpy");
/** @type {function(...*):?} */
var _htons = createExportWrapper("htons");
/** @type {function(...*):?} */
var _ntohs = Module["_ntohs"] = createExportWrapper("ntohs");
/** @type {function(...*):?} */
var ___errno_location = createExportWrapper("__errno_location");
/** @type {function(...*):?} */
var _main = Module["_main"] = createExportWrapper("__main_argc_argv");
/** @type {function(...*):?} */
var _saveSetjmp = createExportWrapper("saveSetjmp");
/** @type {function(...*):?} */
var _fflush = Module["_fflush"] = createExportWrapper("fflush");
/** @type {function(...*):?} */
var ___dl_seterr = createExportWrapper("__dl_seterr");
/** @type {function(...*):?} */
var _fileno = createExportWrapper("fileno");
/** @type {function(...*):?} */
var _setThrew = createExportWrapper("setThrew");
/** @type {function(...*):?} */
var _emscripten_stack_init = function() {
  return (_emscripten_stack_init = Module["asm"]["emscripten_stack_init"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var _emscripten_stack_get_free = function() {
  return (_emscripten_stack_get_free = Module["asm"]["emscripten_stack_get_free"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var _emscripten_stack_get_base = function() {
  return (_emscripten_stack_get_base = Module["asm"]["emscripten_stack_get_base"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var _emscripten_stack_get_end = function() {
  return (_emscripten_stack_get_end = Module["asm"]["emscripten_stack_get_end"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var stackSave = createExportWrapper("stackSave");
/** @type {function(...*):?} */
var stackRestore = createExportWrapper("stackRestore");
/** @type {function(...*):?} */
var stackAlloc = createExportWrapper("stackAlloc");
/** @type {function(...*):?} */
var _emscripten_stack_get_current = function() {
  return (_emscripten_stack_get_current = Module["asm"]["emscripten_stack_get_current"]).apply(null, arguments);
};

/** @type {function(...*):?} */
var dynCall_ji = Module["dynCall_ji"] = createExportWrapper("dynCall_ji");
/** @type {function(...*):?} */
var dynCall_ijiji = Module["dynCall_ijiji"] = createExportWrapper("dynCall_ijiji");
/** @type {function(...*):?} */
var dynCall_jiiji = Module["dynCall_jiiji"] = createExportWrapper("dynCall_jiiji");
/** @type {function(...*):?} */
var dynCall_viji = Module["dynCall_viji"] = createExportWrapper("dynCall_viji");
/** @type {function(...*):?} */
var dynCall_j = Module["dynCall_j"] = createExportWrapper("dynCall_j");
/** @type {function(...*):?} */
var dynCall_jiji = Module["dynCall_jiji"] = createExportWrapper("dynCall_jiji");
/** @type {function(...*):?} */
var dynCall_iiji = Module["dynCall_iiji"] = createExportWrapper("dynCall_iiji");
var ___start_em_js = Module['___start_em_js'] = 631456;
var ___stop_em_js = Module['___stop_em_js'] = 631529;
function invoke_ii(index,a1) {
  var sp = stackSave();
  try {
    return getWasmTableEntry(index)(a1);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_iiiii(index,a1,a2,a3,a4) {
  var sp = stackSave();
  try {
    return getWasmTableEntry(index)(a1,a2,a3,a4);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_iiii(index,a1,a2,a3) {
  var sp = stackSave();
  try {
    return getWasmTableEntry(index)(a1,a2,a3);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_vi(index,a1) {
  var sp = stackSave();
  try {
    getWasmTableEntry(index)(a1);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_iii(index,a1,a2) {
  var sp = stackSave();
  try {
    return getWasmTableEntry(index)(a1,a2);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_viii(index,a1,a2,a3) {
  var sp = stackSave();
  try {
    getWasmTableEntry(index)(a1,a2,a3);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_vii(index,a1,a2) {
  var sp = stackSave();
  try {
    getWasmTableEntry(index)(a1,a2);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_iiiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8,a9) {
  var sp = stackSave();
  try {
    return getWasmTableEntry(index)(a1,a2,a3,a4,a5,a6,a7,a8,a9);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_iiiiii(index,a1,a2,a3,a4,a5) {
  var sp = stackSave();
  try {
    return getWasmTableEntry(index)(a1,a2,a3,a4,a5);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_iiiiiiiii(index,a1,a2,a3,a4,a5,a6,a7,a8) {
  var sp = stackSave();
  try {
    return getWasmTableEntry(index)(a1,a2,a3,a4,a5,a6,a7,a8);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_i(index) {
  var sp = stackSave();
  try {
    return getWasmTableEntry(index)();
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_viiii(index,a1,a2,a3,a4) {
  var sp = stackSave();
  try {
    getWasmTableEntry(index)(a1,a2,a3,a4);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_ji(index,a1) {
  var sp = stackSave();
  try {
    return dynCall_ji(index,a1);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}

function invoke_jiji(index,a1,a2,a3,a4) {
  var sp = stackSave();
  try {
    return dynCall_jiji(index,a1,a2,a3,a4);
  } catch(e) {
    stackRestore(sp);
    if (e !== e+0) throw e;
    _setThrew(1, 0);
  }
}


// include: postamble.js
// === Auto-generated postamble setup entry stuff ===

Module["addRunDependency"] = addRunDependency;
Module["removeRunDependency"] = removeRunDependency;
Module["FS_createPath"] = FS.createPath;
Module["FS_createDataFile"] = FS.createDataFile;
Module["FS_createPreloadedFile"] = FS.createPreloadedFile;
Module["FS_createLazyFile"] = FS.createLazyFile;
Module["FS_createDevice"] = FS.createDevice;
Module["FS_unlink"] = FS.unlink;
var missingLibrarySymbols = [
  'getHostByName',
  'traverseStack',
  'convertPCtoSourceLocation',
  'jstoi_s',
  'getDynCaller',
  'runtimeKeepalivePush',
  'runtimeKeepalivePop',
  'asmjsMangle',
  'HandleAllocator',
  'getNativeTypeSize',
  'STACK_SIZE',
  'STACK_ALIGN',
  'POINTER_SIZE',
  'ASSERTIONS',
  'writeI53ToI64Clamped',
  'writeI53ToI64Signaling',
  'writeI53ToU64Clamped',
  'writeI53ToU64Signaling',
  'convertU32PairToI53',
  'getCFunc',
  'ccall',
  'cwrap',
  'uleb128Encode',
  'sigToWasmTypes',
  'generateFuncType',
  'convertJsFunctionToWasm',
  'getEmptyTableSlot',
  'updateTableMap',
  'getFunctionAddress',
  'addFunction',
  'removeFunction',
  'reallyNegative',
  'unSign',
  'strLen',
  'reSign',
  'formatString',
  'intArrayToString',
  'AsciiToString',
  'stringToAscii',
  'UTF16ToString',
  'stringToUTF16',
  'lengthBytesUTF16',
  'UTF32ToString',
  'stringToUTF32',
  'lengthBytesUTF32',
  'writeStringToMemory',
  'writeArrayToMemory',
  'fillDeviceOrientationEventData',
  'registerDeviceOrientationEventCallback',
  'fillDeviceMotionEventData',
  'registerDeviceMotionEventCallback',
  'screenOrientation',
  'fillOrientationChangeEventData',
  'registerOrientationChangeEventCallback',
  'hideEverythingExceptGivenElement',
  'restoreHiddenElements',
  'softFullscreenResizeWebGLRenderTarget',
  'registerPointerlockErrorEventCallback',
  'fillBatteryEventData',
  'battery',
  'registerBatteryEventCallback',
  'jsStackTrace',
  'stackTrace',
  'checkWasiClock',
  'createDyncallWrapper',
  'setImmediateWrapped',
  'clearImmediateWrapped',
  'polyfillSetImmediate',
  'getPromise',
  'makePromise',
  'makePromiseCallback',
  'ExceptionInfo',
  'exception_addRef',
  'exception_decRef',
  '_setNetworkCallback',
  'writeGLArray',
  'SDL_unicode',
  'SDL_ttfContext',
  'SDL_audio',
  'GLFW_Window',
  'runAndAbortIfError',
  'ALLOC_NORMAL',
  'ALLOC_STACK',
  'allocate',
];
missingLibrarySymbols.forEach(missingLibrarySymbol)

var unexportedSymbols = [
  'run',
  'UTF8ArrayToString',
  'UTF8ToString',
  'stringToUTF8Array',
  'stringToUTF8',
  'lengthBytesUTF8',
  'addOnPreRun',
  'addOnInit',
  'addOnPreMain',
  'addOnExit',
  'addOnPostRun',
  'FS_createFolder',
  'FS_createLink',
  'out',
  'err',
  'callMain',
  'abort',
  'keepRuntimeAlive',
  'wasmMemory',
  'stackAlloc',
  'stackSave',
  'stackRestore',
  'getTempRet0',
  'setTempRet0',
  'writeStackCookie',
  'checkStackCookie',
  'ptrToString',
  'zeroMemory',
  'stringToNewUTF8',
  'exitJS',
  'getHeapMax',
  'emscripten_realloc_buffer',
  'ENV',
  'ERRNO_CODES',
  'ERRNO_MESSAGES',
  'setErrNo',
  'inetPton4',
  'inetNtop4',
  'inetPton6',
  'inetNtop6',
  'readSockaddr',
  'writeSockaddr',
  'DNS',
  'Protocols',
  'Sockets',
  'getRandomDevice',
  'timers',
  'warnOnce',
  'UNWIND_CACHE',
  'readEmAsmArgsArray',
  'readEmAsmArgs',
  'runEmAsmFunction',
  'runMainThreadEmAsm',
  'jstoi_q',
  'getExecutableName',
  'listenOnce',
  'autoResumeAudioContext',
  'dynCallLegacy',
  'dynCall',
  'handleException',
  'callUserCallback',
  'maybeExit',
  'safeSetTimeout',
  'asyncLoad',
  'alignMemory',
  'mmapAlloc',
  'writeI53ToI64',
  'readI53FromI64',
  'readI53FromU64',
  'convertI32PairToI53',
  'convertI32PairToI53Checked',
  'freeTableIndexes',
  'functionsInTableMap',
  'setValue',
  'getValue',
  'PATH',
  'PATH_FS',
  'intArrayFromString',
  'UTF16Decoder',
  'allocateUTF8',
  'allocateUTF8OnStack',
  'writeAsciiToMemory',
  'SYSCALLS',
  'getSocketFromFD',
  'getSocketAddress',
  'JSEvents',
  'registerKeyEventCallback',
  'specialHTMLTargets',
  'maybeCStringToJsString',
  'findEventTarget',
  'findCanvasEventTarget',
  'getBoundingClientRect',
  'fillMouseEventData',
  'registerMouseEventCallback',
  'registerWheelEventCallback',
  'registerUiEventCallback',
  'registerFocusEventCallback',
  'fillFullscreenChangeEventData',
  'registerFullscreenChangeEventCallback',
  'JSEvents_requestFullscreen',
  'JSEvents_resizeCanvasForFullscreen',
  'registerRestoreOldStyle',
  'setLetterbox',
  'currentFullscreenStrategy',
  'restoreOldWindowedStyle',
  'doRequestFullscreen',
  'fillPointerlockChangeEventData',
  'registerPointerlockChangeEventCallback',
  'requestPointerLock',
  'fillVisibilityChangeEventData',
  'registerVisibilityChangeEventCallback',
  'registerTouchEventCallback',
  'fillGamepadEventData',
  'registerGamepadEventCallback',
  'registerBeforeUnloadEventCallback',
  'setCanvasElementSize',
  'getCanvasElementSize',
  'demangle',
  'demangleAll',
  'ExitStatus',
  'getEnvStrings',
  'doReadv',
  'doWritev',
  'dlopenMissingError',
  'promiseMap',
  'uncaughtExceptionCount',
  'exceptionLast',
  'exceptionCaught',
  'Browser',
  'setMainLoop',
  'wget',
  'FS',
  'MEMFS',
  'TTY',
  'PIPEFS',
  'SOCKFS',
  'tempFixedLengthArray',
  'miniTempWebGLFloatBuffers',
  'heapObjectForWebGLType',
  'heapAccessShiftForWebGLHeap',
  'GL',
  'emscriptenWebGLGet',
  'computeUnpackAlignedImageSize',
  'emscriptenWebGLGetTexPixelData',
  'emscriptenWebGLGetUniform',
  'webglGetUniformLocation',
  'webglPrepareUniformLocationsBeforeFirstUse',
  'webglGetLeftBracePos',
  'emscriptenWebGLGetVertexAttrib',
  'emscriptenWebGLGetBufferBinding',
  'emscriptenWebGLValidateMapBufferTarget',
  'AL',
  'SDL',
  'SDL_gfx',
  'GLUT',
  'EGL',
  'GLFW',
  'GLEW',
  'IDBStore',
  'emscriptenWebGLGetIndexed',
];
unexportedSymbols.forEach(unexportedRuntimeSymbol);



var calledRun;

dependenciesFulfilled = function runCaller() {
  // If run has never been called, and we should call run (INVOKE_RUN is true, and Module.noInitialRun is not false)
  if (!calledRun) run();
  if (!calledRun) dependenciesFulfilled = runCaller; // try this again later, after new deps are fulfilled
};

function callMain(args = []) {
  assert(runDependencies == 0, 'cannot call main when async dependencies remain! (listen on Module["onRuntimeInitialized"])');
  assert(__ATPRERUN__.length == 0, 'cannot call main when preRun functions remain to be called');

  var entryFunction = _main;

  args.unshift(thisProgram);

  var argc = args.length;
  var argv = stackAlloc((argc + 1) * 4);
  var argv_ptr = argv >> 2;
  args.forEach((arg) => {
    HEAP32[argv_ptr++] = allocateUTF8OnStack(arg);
  });
  HEAP32[argv_ptr] = 0;

  try {

    var ret = entryFunction(argc, argv);

    // if we're not running an evented main loop, it's time to exit
    exitJS(ret, /* implicit = */ true);
    return ret;
  }
  catch (e) {
    return handleException(e);
  }
}

function stackCheckInit() {
  // This is normally called automatically during __wasm_call_ctors but need to
  // get these values before even running any of the ctors so we call it redundantly
  // here.
  _emscripten_stack_init();
  // TODO(sbc): Move writeStackCookie to native to to avoid this.
  writeStackCookie();
}

function run(args = arguments_) {

  if (runDependencies > 0) {
    return;
  }

    stackCheckInit();

  preRun();

  // a preRun added a dependency, run will be called later
  if (runDependencies > 0) {
    return;
  }

  function doRun() {
    // run may have just been called through dependencies being fulfilled just in this very frame,
    // or while the async setStatus time below was happening
    if (calledRun) return;
    calledRun = true;
    Module['calledRun'] = true;

    if (ABORT) return;

    initRuntime();

    preMain();

    if (Module['onRuntimeInitialized']) Module['onRuntimeInitialized']();

    if (shouldRunNow) callMain(args);

    postRun();
  }

  if (Module['setStatus']) {
    Module['setStatus']('Running...');
    setTimeout(function() {
      setTimeout(function() {
        Module['setStatus']('');
      }, 1);
      doRun();
    }, 1);
  } else
  {
    doRun();
  }
  checkStackCookie();
}

function checkUnflushedContent() {
  // Compiler settings do not allow exiting the runtime, so flushing
  // the streams is not possible. but in ASSERTIONS mode we check
  // if there was something to flush, and if so tell the user they
  // should request that the runtime be exitable.
  // Normally we would not even include flush() at all, but in ASSERTIONS
  // builds we do so just for this check, and here we see if there is any
  // content to flush, that is, we check if there would have been
  // something a non-ASSERTIONS build would have not seen.
  // How we flush the streams depends on whether we are in SYSCALLS_REQUIRE_FILESYSTEM=0
  // mode (which has its own special function for this; otherwise, all
  // the code is inside libc)
  var oldOut = out;
  var oldErr = err;
  var has = false;
  out = err = (x) => {
    has = true;
  }
  try { // it doesn't matter if it fails
    _fflush(0);
    // also flush in the JS FS layer
    ['stdout', 'stderr'].forEach(function(name) {
      var info = FS.analyzePath('/dev/' + name);
      if (!info) return;
      var stream = info.object;
      var rdev = stream.rdev;
      var tty = TTY.ttys[rdev];
      if (tty && tty.output && tty.output.length) {
        has = true;
      }
    });
  } catch(e) {}
  out = oldOut;
  err = oldErr;
  if (has) {
    warnOnce('stdio streams had content in them that was not flushed. you should set EXIT_RUNTIME to 1 (see the FAQ), or make sure to emit a newline when you printf etc.');
  }
}

if (Module['preInit']) {
  if (typeof Module['preInit'] == 'function') Module['preInit'] = [Module['preInit']];
  while (Module['preInit'].length > 0) {
    Module['preInit'].pop()();
  }
}

// shouldRunNow refers to calling main(), not run().
var shouldRunNow = true;

if (Module['noInitialRun']) shouldRunNow = false;

run();


// end include: postamble.js