Contains the computed sample coverage mask for the current fragment.
gl_SampleMaskInis 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. BitBof maskgl_SampleMask[M]corresponds to sample 32 *M+B. The array has
ceil (s/ 32) elements wheresis the maximum number of color samples supported by the implementation.
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