GL_SAMPLEMASK - Online Linux Manual PageSection : 3G
Updated : 01/20/2022
Source : [FIXME: source]
Note : [FIXME: manual]

NAMEgl_SampleMask − specifies the sample coverage mask for the current fragment

DECLARATIONout ​int ​gl_SampleMask[] ​;.SH "DESCRIPTION" gl_SampleMask is a fragment language output array that may be used to set the sample mask for the fragment being processed​. Coverage for the current fragment will become the logical AND of the coverage mask and the output gl_SampleMask​. That is, setting a bit in gl_SampleMask to zero will cause the corresponding sample to be considered uncovered for the purposes of multisample fragment operations​. However, setting sample mask bits back to one will never enable samples not covered by the original primitive​. Bit B of mask gl_SampleMask[M] corresponds to sample 32 * M + B​. This array must be sized in the fragment shader either implicitly or explicitly to be the same size as the implementation−dependent maximum sample−mask (as an array of 32−bit elements), determined by the maximum number of samples​. If the fragment shader statically assigns a value to gl_SampleMask, the sample mask will be undefined for any array elements of any fragment shader invocation that fails to assign a value​. If a shader does not statically assign a value to gl_SampleMask, the sample mask has no effect on the processing of a fragment​. If the fragment shader is being evaluated at any frequency other than per−fragment, bits within the sample mask not corresponding to the current fragment shader invocation are ignored​.

VERSION SUPPORT OpenGL Shading Language Version Variable Name 1​.10 none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'>none;'> 1​.20 1​.30 1​.40 1​.50 3​.30 4​.00 4​.10 4​.20 4​.30 4​.40 4​.50 gl_SampleMask

SEE ALSOgl_SampleMaskIn(), gl_SampleID(), gl_SamplePosition(), gl_FragCoord()

COPYRIGHTCopyright © 2011−2014 Khronos Group​. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1​.0, 8 June 1999​. http://opencontent​.org/openpub/​.

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