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Add a color matrix option to YUV texture shaders - #381
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FragmentSampleYUV420Texture()andFragmentSampleNV12Texture()convert YUV to RGB with fixed BT.601 limited range constants, so HD (BT.709), BT.2020 and full range videos get wrong colors.Both now take an optional
colorMatrixflag. With it the shader declaresuniform mat4 yuvToRgband converts withyuvToRgb * vec4(y, u, v, 1.), so the caller passes the matrix for the frame's coefficients, range and bit depth. Without it the conversion is the same as before; the offsets only moved from the sampling lines intoFragmentYUV2RGB().Used by telegramdesktop/tdesktop#31408.