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

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NAMEgl_SampleID − contains the index of the sample currently being processed

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DECLARATIONin ​int ​gl_SampleID ​;.SH "DESCRIPTION" gl_SampleID is a fragment language input variable that contains the index of the sample currently being processed​. This variable is in the range 0 to gl_NumSamples() − 1, where gl_NumSamples() is the total number of samples in each fragment for the current framebuffer (and thus 1 if rendering to a non−multisample buffer)​. Any static use of this variable in a fragment shader causes the entire shader to be evaluated per−sample rather than per−fragment​. When rendering to a non−multisample buffer, or if multisample rasterization is disabled, gl_SampleID will always be zero​. gl_NumSamples() is the sample count of the framebuffer regardless of whether multisample rasterization is enabled or not​.

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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_SampleID − − − − − − ✔ ✔ ✔ ✔ ✔ ✔

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SEE ALSOgl_SamplePosition(), gl_NumSamples()

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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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COPYRIGHT
Copyright © 2011-2014 Khronos Group
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