add support for half-float and probe for format renderability, closes… #15
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…tackgl#11 Adds two new `options`: * like `options.float`, `options.halfFloat` fails if it cannot create the half-float texture * like `options.preferFloat`, `options.preferHalfFloat` will try half-float, then float, then fail to 8-bit. * `options.preferFloat` now tries a half-flat before failing to 8-bit The function `isFormatRenderable` checks if a given format can actually be rendered to by attaching a texture to a framebuffer. Checking the WebGL extension alone is insufficient due to variations in implementations (e.g. iOS supports OES_texture_float, but only for reading, not for writing). As this is a FBO and thus intended for writing, this extra check is important.
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… #11
Adds two new
options:options.float,options.halfFloatfails if it cannot createthe half-float texture
options.preferFloat,options.preferHalfFloatwill tryhalf-float, then float, then fail to 8-bit.
options.preferFloatnow tries a half-flat before failing to 8-bitThe function
isFormatRenderablechecks if a given format canactually be rendered to by attaching a texture to a framebuffer.
Checking the WebGL extension alone is insufficient due to variations
in implementations (e.g. iOS supports OES_texture_float, but only
for reading, not for writing). As this is a FBO and thus intended for
writing, this extra check is important.