NAME¶
gl_SampleID - contains the index of the sample currently being processed
DECLARATION¶
in 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.
VERSION SUPPORT¶
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OpenGL Shading Language Version |
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Variable Name |
1.10 |
1.20 |
1.30 |
1.40 |
1.50 |
3.30 |
4.00 |
4.10 |
4.20 |
4.30 |
4.40 |
4.50 |
gl_SampleID |
- |
- |
- |
- |
- |
- |
✔ |
✔ |
✔ |
✔ |
✔ |
✔ |
SEE ALSO¶
gl_SamplePosition(),
gl_NumSamples()
COPYRIGHT¶
Copyright © 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/.
COPYRIGHT¶
Copyright © 2011-2014 Khronos Group