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Re: [Public WebGL] NPOT (non-power-of-two) textures
Given that Rectangle Textures use different samplers in the shaders (sampler2DRect vs sampler2D) I don't think you could practically emulate this in a shader-based API.
You have to muck with the shader anyway to un-normalize the texture. Using a different sampler doesn't add any work. I'm not saying it's easy.
To the best of my knowledge hardware with NPOT support was introduced in mid 2004.
-- Kenneth Waters