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NAME

       gl_PointSize - contains size of rasterized points, in pixels

DECLARATION

       gl_PointSize is a member of the gl_PerVertex named block:

           out gl_PerVertex {
               vec4 gl_Position;
               float gl_PointSize;
               float gl_ClipDistance[];
           };

DESCRIPTION

       In the vertex, tessellation evaluation and geometry languages, a single global instance of
       the gl_PerVertex named block is available and its gl_PointSize member is an output that
       receives the intended size of the point to be rasterized, in pixels. It may be written at
       any time during shader execution. If GL_PROGRAM_POINT_SIZE is enabled, gl_PointSize is
       used to determine the size of rasterized points, otherwise it is ignored by the
       rasterization stage.

       In the tessellation control language, the gl_PerVertex named block is used to construct an
       array, gl_out[], whose members become available as inputs to the subsequent tessellation
       evaluation shader.

       The value of gl_PointSize (or the gl_PointSize member of the gl_out[] array, in the case
       of the tessellation control shader) is undefined after the vertex, tessellation control,
       and tessellation evaluation shading stages if the corresponding shader executable does not
       write to gl_PointSize. It is also undefined after the geometry processing stage if the
       geometry shader executable calls EmitVertex() without having written gl_PointSize since
       the last call to EmitVertex() (or hasn't written it at all).

       In the tessellation control, tessellation evaluation and geometry languages, the
       gl_PerVertex named block is used to construct an array, gl_in[] of per-vertex or
       per-control point inputs whose content represents the corresponding outputs written by the
       previous stage.

VERSION SUPPORT

       ┌──────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │              │        OpenGL Shading Language Version                                            │
       ├──────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │Variable1.101.201.301.401.503.304.004.104.204.304.404.50 │
       │Name          │      │      │      │      │      │      │      │      │      │      │      │      │
       ├──────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │gl_PointSize  │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       │(vertex       │      │      │      │      │      │      │      │      │      │      │      │      │
       │shader)       │      │      │      │      │      │      │      │      │      │      │      │      │
       ├──────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │gl_PointSize  │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       │(geometry     │      │      │      │      │      │      │      │      │      │      │      │      │
       │shader)       │      │      │      │      │      │      │      │      │      │      │      │      │
       ├──────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │gl_PointSize  │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       │(tessellation │      │      │      │      │      │      │      │      │      │      │      │      │
       │evaluation    │      │      │      │      │      │      │      │      │      │      │      │      │
       │shader)       │      │      │      │      │      │      │      │      │      │      │      │      │
       └──────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘

SEE ALSO

       gl_Position(), gl_ClipDistance()

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]                             01/03/2018                           GL_POINTSIZE(3G)