NAME¶
gl_PointCoord - contains the coordinate of a fragment within a point
DECLARATION¶
in vec2 gl_PointCoord ;.SH "DESCRIPTION"
gl_PointCoord is a fragment language input variable that contains the
two-dimensional coordinates indicating where within a point primitive the
current fragment is located. If the current primitive is not a point, then
values read from
gl_PointCoord are undefined.
gl_PointCoord.s ranges from 0.0 to 1.0 across the point horizontally from
left to right. If
GL_POINT_SPRITE_COORD_ORIGIN is
GL_LOWER_LEFT,
gl_PointCoord.t varies from 0.0 to 1.0 vertically from bottom to top.
Otherwise, if
GL_POINT_SPRITE_COORD_ORIGIN is
GL_UPPER_LEFT then
gl_PointCoord.t varies from 0.0 to 1.0 vertically from top to bottom.
The default value of
GL_POINT_SPRITE_COORD_ORIGIN is
GL_UPPER_LEFT.
VERSION SUPPORT¶
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OpenGL Shading Language Version |
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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_PointCoord |
✔ |
✔ |
✔ |
✔ |
✔ |
✔ |
✔ |
✔ |
✔ |
✔ |
✔ |
✔ |
SEE ALSO¶
gl_FragCoord(),
gl_FragDepth()
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