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 © 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