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NAME
       interpolateAtCentroid - sample a varying at the centroid of a pixel


DECLARATION
       float interpolateAtCentroid(float interpolant);

       vec2 interpolateAtCentroid(vec2 interpolant);

       vec3 interpolateAtCentroid(vec3 interpolant);

       vec4 interpolateAtCentroid(vec4 interpolant);


PARAMETERS
       interpolant
           Specifies the interpolant to be sampled at the pixel centroid.


DESCRIPTION
       interpolateAtCentroid returns the value of the input varying interpolant sampled at a
       location inside both the pixel and the primitive being processed. The value obtained would
       be the value assigned to the input variable if declared with the centroid qualifier.


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                  │      │      │      │      │      │      │      │      │      │      │      │      │
       ├──────────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │interpolateAtCentroid │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       └──────────────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘


SEE ALSO
       interpolateAtSample(), interpolateAtOffset()


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                   INTERPOLATEATCENTROI(3G)