gl_SampleMaskIn — contains the computed sample coverage mask for the current fragment
in int gl_SampleMaskIn ;
gl_SampleMaskIn is a fragment language that indicates the set of samples covered by the primitive generating the fragment during multisample rasterization. It has a sample bit set if and only if the sample is considered covered for this fragment shader invocation. Bit B of mask
gl_SampleMask[M] corresponds to sample 32 * M + B. The array has
ceil(s / 32) elements where s is the maximum number of color samples supported by the implementation.
|OpenGL Shading Language Version|
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