Feature openxr

jme3-xr/build.gradle

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+dependencies {
+    api project(':jme3-core')
+    api project(':jme3-lwjgl3')
+    api project(':jme3-desktop')
+    api project(':jme3-effects')
+
+    // https://mvnrepository.com/artifact/net.java.dev.jna/jna
+    implementation 'net.java.dev.jna:jna:5.10.0'
+    implementation 'com.nativelibs4java:jnaerator-runtime:0.12'
+
+    // Native OpenXR/LWJGL support
+    api "org.lwjgl:lwjgl-openxr:${lwjgl3Version}"
+//    implementation "org.lwjgl:lwjgl-openxr:${lwjgl3Version}:natives-linux"
+//    implementation "org.lwjgl:lwjgl-openxr:${lwjgl3Version}:natives-macos"
+    runtimeOnly "org.lwjgl:lwjgl-openxr:${lwjgl3Version}:natives-windows"
+    runtimeOnly "org.lwjgl:lwjgl-openxr:${lwjgl3Version}:natives-linux"
+//    runtimeOnly "org.lwjgl:lwjgl-openxr:${lwjgl3Version}:natives-macos"
+
+    // Necessary by lwjgl-openxr
+    api "org.joml:joml:1.10.4"
+    api "org.lwjgl:lwjgl-egl:${lwjgl3Version}"
+//    api "org.lwjgl:lwjgl-vulkan:${lwjgl3Version}"
+}
+
+javadoc {
+    // Disable doclint for JDK8+.
+    if (JavaVersion.current().isJava8Compatible()){
+        options.addStringOption('Xdoclint:none', '-quiet')
+    }
+}

jme3-xr/src/main/java/com/jme3/input/xr/Eye.java

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+package com.jme3.input.xr;
+
+import com.jme3.app.SimpleApplication;
+import com.jme3.material.Material;
+import com.jme3.math.ColorRGBA;
+import com.jme3.math.Quaternion;
+import com.jme3.math.Vector3f;
+import com.jme3.renderer.Camera;
+import com.jme3.renderer.ViewPort;
+import com.jme3.scene.Geometry;
+import com.jme3.scene.shape.Box;
+import com.jme3.texture.FrameBuffer;
+import com.jme3.texture.Texture;
+import com.jme3.texture.Texture2D;
+import com.jme3.texture.FrameBuffer.FrameBufferTarget;
+import com.jme3.texture.Image.Format;
+
+public class Eye {
+	static int index = 0;
+	SimpleApplication app;
+	float posX;
+	Vector3f tmpVec = new Vector3f();
+	Texture2D offTex;
+	Geometry offGeo;
+	Camera offCamera;
+	Vector3f centerPos = new Vector3f(0f, 0f, -5f);
+	Quaternion centerRot = new Quaternion();
+
+    public Eye(SimpleApplication app)
+    {
+    	this.app = app;
+    	setupOffscreenView(app);
+        Material mat = new Material(app.getAssetManager(), "Common/MatDefs/Misc/Unshaded.j3md");
+        mat.setTexture("ColorMap", offTex);
+
+        offGeo = new Geometry("box", new Box(1, 1, 1));
+        offGeo.setMaterial(mat);
+    }
+
+    public void setPosX(float posX) { this.posX = posX; }
+    public float getPosX() { return posX; }
+
+    /** Moves the camera.
+     * @param The new absolute center position. */
+    public void moveAbs(Vector3f newPos)
+    {
+    	centerPos.set(newPos);
+    	rotateAbs(offCamera.getRotation());
+    }
+
+    /** Rotates the camera, and moves left/right.
+     * @param The new rotation. */
+    public void rotateAbs(Quaternion newRot)
+    {
+    	tmpVec.set(posX, 0.0f, 0.0f);
+    	newRot.multLocal(tmpVec);
+    	offCamera.setLocation(tmpVec.addLocal(centerPos));
+    	offCamera.setRotation(newRot);
+    }
+
+    private void setupOffscreenView(SimpleApplication app)
+    {
+    	int w = app.getContext().getSettings().getWidth();
+    	int h = app.getContext().getSettings().getHeight();
+        offCamera = new Camera(w, h);
+
+        ViewPort offView = app.getRenderManager().createPreView("OffscreenViewX" + (index++), offCamera);
+        offView.setClearFlags(true, true, true);
+        offView.setBackgroundColor(ColorRGBA.DarkGray);
+        FrameBuffer offBuffer = new FrameBuffer(w, h, 1);
+
+        //setup framebuffer's cam
+        offCamera.setFrustumPerspective(45f, 1f, 1f, 1000f);
+        offCamera.lookAt(new Vector3f(0f, 0f, 0f), Vector3f.UNIT_Y);
+
+        //setup framebuffer's texture
+        offTex = new Texture2D(w, h, Format.RGBA8);
+        offTex.setMinFilter(Texture.MinFilter.Trilinear);
+        offTex.setMagFilter(Texture.MagFilter.Bilinear);
+
+        //setup framebuffer to use texture
+        offBuffer.setDepthTarget(FrameBufferTarget.newTarget(Format.Depth));
+        offBuffer.addColorTarget(FrameBufferTarget.newTarget(offTex));
+
+        //set viewport to render to offscreen framebuffer
+        offView.setOutputFrameBuffer(offBuffer);
+        offView.attachScene(app.getRootNode());
+    }
+
+    public void render()
+    {
+    	app.getRenderManager().renderGeometry(offGeo);
+    }
+}

jme3-xr/src/main/java/com/jme3/input/xr/XrHmd.java

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+package com.jme3.input.xr;
+
+import java.util.ArrayList;
+
+import com.jme3.app.SimpleApplication;
+import com.jme3.math.Quaternion;
+import com.jme3.math.Vector3f;
+import com.jme3.system.AppSettings;
+import com.jme3.system.lwjgl.LwjglWindowXr;
+
+public class XrHmd
+{
+	public static final float DEFAULT_X_DIST = 0.4f;
+	public static final float DEFAULT_X_ROT = 0.028f;
+	public static final float DEFAULT_POS_MULT = 10.0f;
+	Quaternion tmpQ = new Quaternion();
+	float[] tmpArr = new float[3];
+	Quaternion tmpQdistRotL = new Quaternion().fromAngles(0, -DEFAULT_X_ROT, 0);
+	Quaternion tmpQdistRotR = new Quaternion().fromAngles(0, DEFAULT_X_ROT, 0);
+	SimpleApplication app;
+	Eye leftEye;
+	Eye rightEye;
+	ArrayList<XrListener.OrientationListener> hmdListeners = new ArrayList<XrListener.OrientationListener>();
+	ArrayList<XrListener.ButtonPressedListener> contr1Listeners = new ArrayList<XrListener.ButtonPressedListener>();
+	ArrayList<XrListener.ButtonPressedListener> contr2Listeners = new ArrayList<XrListener.ButtonPressedListener>();
+
+	public XrHmd(SimpleApplication app)
+	{
+		this.app = app;
+		leftEye = new Eye(app);
+		rightEye = new Eye(app);
+		setXDistance(DEFAULT_X_DIST);
+		hmdListeners.add((p,r) -> doMoveRotate(p,r));
+	}
+
+	Vector3f initPos;
+	Vector3f diffPos = new Vector3f();
+	private void doMoveRotate(Vector3f p, Quaternion r)
+	{
+		if (initPos == null) { initPos = new Vector3f(p.getX(), p.getY(), p.getZ()); }
+		initPos.subtract(p,diffPos);
+		leftEye.moveAbs(diffPos);
+		rightEye.moveAbs(diffPos);
+		tmpQ.set(r);
+		tmpQ.inverseLocal();
+		tmpQ.set(tmpQ.getX(), tmpQ.getY(), -tmpQ.getZ(), tmpQ.getW());
+		leftEye.rotateAbs(tmpQ.multLocal(tmpQdistRotL));
+		tmpQ.set(r);
+		tmpQ.inverseLocal();
+		tmpQ.set(tmpQ.getX(), tmpQ.getY(), -tmpQ.getZ(), tmpQ.getW());
+		rightEye.rotateAbs(tmpQ.multLocal(tmpQdistRotR));
+	}
+
+	public Eye getLeftEye() { return leftEye; }
+	public Eye getRightEye() { return rightEye; }
+
+	public ArrayList<XrListener.OrientationListener> getHmdOrientationListeners() { return hmdListeners; }
+	public ArrayList<XrListener.ButtonPressedListener> getContr1ButtonPressedListeners() { return contr1Listeners; }
+	public ArrayList<XrListener.ButtonPressedListener> getContr2ButtonPressedListeners() { return contr2Listeners; }
+
+	Vector3f multPos = new Vector3f();
+	public void onUpdateHmdOrientation(Vector3f viewPos, Quaternion viewRot)
+	{
+		viewPos.mult(DEFAULT_POS_MULT, multPos);
+		multPos.setX(0.0f-multPos.getX());
+		multPos.setY(0.0f-multPos.getY());
+		for (XrListener.OrientationListener l : hmdListeners) { l.onUpdateOrientation(multPos, viewRot); }
+	}
+
+	/** Must be called in main function before init.
+	 * @param s The appSettings that must be used with app.setSettings(s). */
+	public static void setRendererForSettings(AppSettings s)
+	{
+		s.setRenderer("CUSTOM" + com.jme3.system.lwjgl.LwjglWindowXr.class.getName()); //see JmeDesktopSystem.newContext(...)
+	}
+
+	/** Must be called in simpleInitApp-function of SimpleApplication.
+	 * @return The head-mounted-device object. */
+	public static XrHmd initHmd(SimpleApplication app)
+	{
+		XrHmd xrHmd = new XrHmd(app);
+		((LwjglWindowXr)app.getContext()).getXr().setHmd(xrHmd);
+		return xrHmd;
+	}
+
+    /** Gets the distance between the eyes. Default is DEFAULT_X_DIST */
+    public float getXDistance() { return rightEye.getPosX() * 2f; }
+
+    /** Sets the distance between the eyes. Default is DEFAULT_X_DIST */
+    public void setXDistance(float xDist)
+    {
+    	rightEye.setPosX(xDist / 2f);
+    	leftEye.setPosX(xDist / -2f);
+    }
+
+    /** Gets the rotation angle between the eyes. Default is DEFAULT_X_ROT */
+    public float getXRotation() { return tmpQdistRotR.toAngles(tmpArr)[1]; }
+
+    /** Sets the rotation angle between the eyes. Default is DEFAULT_X_ROT */
+    public void setXRotation(float xRot)
+    {
+    	tmpQdistRotR.fromAngles(0, xRot, 0);
+    	tmpQdistRotL.fromAngles(0, xRot, 0);
+    }
+}

jme3-xr/src/main/java/com/jme3/input/xr/XrListener.java

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+package com.jme3.input.xr;
+
+import com.jme3.math.Quaternion;
+import com.jme3.math.Vector3f;
+
+public interface XrListener {
+    public interface OrientationListener
+    {
+    	public void onUpdateOrientation(Vector3f pos, Quaternion rot);
+    }
+
+    public interface ButtonPressedListener
+    {
+    	public void onButtonPressed(int num);
+    }
+}

jme3-xr/src/main/java/com/jme3/system/lwjgl/EmptyKeyInput.java

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+package com.jme3.system.lwjgl;
+
+import static org.lwjgl.glfw.GLFW.glfwGetTime;
+
+import com.jme3.input.KeyInput;
+import com.jme3.input.RawInputListener;
+
+public class EmptyKeyInput implements KeyInput {
+
+	public EmptyKeyInput() {  }
+    @Override
+    public void initialize() {}
+
+    @Override
+    public boolean isInitialized() {return false;}
+
+    @Override
+    public void update() {}
+	@Override
+	public void destroy() {
+		// TODO Auto-generated method stub
+
+	}
+	@Override
+	public void setInputListener(RawInputListener listener) {
+		// TODO Auto-generated method stub
+
+	}
+	@Override
+	public long getInputTimeNanos() {
+        return (long) (glfwGetTime() * 1000000000);
+	}
+	@Override
+	public String getKeyName(int key) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+	public void resetContext() {}
+}

jme3-xr/src/main/java/com/jme3/system/lwjgl/EmptyMouseInput.java

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+package com.jme3.system.lwjgl;
+
+import static org.lwjgl.glfw.GLFW.glfwGetTime;
+
+import com.jme3.cursors.plugins.JmeCursor;
+import com.jme3.input.MouseInput;
+import com.jme3.input.RawInputListener;
+
+public class EmptyMouseInput implements MouseInput {
+
+	public EmptyMouseInput() {  }
+    @Override
+    public void initialize() {}
+
+    @Override
+    public boolean isInitialized() {return false;}
+	@Override
+	public void update() {
+		// TODO Auto-generated method stub
+
+	}
+	@Override
+	public void destroy() {
+		// TODO Auto-generated method stub
+
+	}
+	@Override
+	public void setInputListener(RawInputListener listener) {
+		// TODO Auto-generated method stub
+
+	}
+	@Override
+	public long getInputTimeNanos() {
+        return (long) (glfwGetTime() * 1000000000);
+	}
+	@Override
+	public void setCursorVisible(boolean visible) {
+		// TODO Auto-generated method stub
+
+	}
+	@Override
+	public int getButtonCount() {
+		// TODO Auto-generated method stub
+		return 3;
+	}
+	@Override
+	public void setNativeCursor(JmeCursor cursor) {
+		// TODO Auto-generated method stub
+	}
+
+	public void resetContext() {}
+}