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NAME
       gl_SamplePosition - contains the location of the current sample within the current
       fragment


DECLARATION
       in vec2 gl_SamplePosition ;.SH "DESCRIPTION"

       gl_SamplePosition is a fragment language input variable that contains the location within
       a fragment of the sample currently being processed. The x and y components of
       gl_SamplePosition contain the sub-pixel coordinate of the current sample and will have
       values in the range 0.0 to 1.0. The sub-pixel coordinates of the center of the pixel are
       always (0.5, 0.5). Any static use of gl_SamplePosition causes the entire fragment shader
       to be evaluated per-sample rather than per-fragment. When rendering to a non-multisample
       buffer, or if multisample rasterization is disabled, gl_SamplePosition will be (0.5, 0.5).


VERSION SUPPORT
       ┌──────────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │                  │        OpenGL Shading Language Version                                            │
       ├──────────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │Function          │ 1.10 │ 1.20 │ 1.30 │ 1.40 │ 1.50 │ 3.30 │ 4.00 │ 4.10 │ 4.20 │ 4.30 │ 4.40 │ 4.50 │
       │Name              │      │      │      │      │      │      │      │      │      │      │      │      │
       ├──────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │gl_SamplePosition │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       └──────────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘


SEE ALSO
       gl_SampleID(), gl_SampleMask(), gl_FragCoord()


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

[FIXME: source]                             07/22/2015                      GL_SAMPLEPOSITION(3G)