GL_POINTSIZE(3G)                [FIXME: manual]               GL_POINTSIZE(3G)

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                          |
       +--------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |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_PointSize  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  |
       |(vertex       |      |      |      |      |      |      |      |      |      |      |      |      |
       |shader)       |      |      |      |      |      |      |      |      |      |      |      |      |
       +--------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |gl_PointSize  |  -   |  -   |  -   |  -   | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  |
       |(geometry     |      |      |      |      |      |      |      |      |      |      |      |      |
       |shader)       |      |      |      |      |      |      |      |      |      |      |      |      |
       +--------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |gl_PointSize  |  -   |  -   |  -   |  -   |  -   |  -   | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  |
       |(tessellation |      |      |      |      |      |      |      |      |      |      |      |      |
       |evaluation    |      |      |      |      |      |      |      |      |      |      |      |      |
       |shader)       |      |      |      |      |      |      |      |      |      |      |      |      |
       +--------------+------+------+------+------+------+------+------+------+------+------+------+------+

SEE ALSO
       gl_Position(), gl_ClipDistance()

COPYRIGHT
       Copyright (C) 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 (C) 2011-2014 Khronos Group

[FIXME: source]                   05/21/2022                  GL_POINTSIZE(3G)