gl_PointCoord — contains the coordinate of a fragment within a point
in vec2 gl_PointCoord;
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
.
Variable | Version 1.10 | Version 1.20 | Version 1.30 | Version 1.40 | Version 1.50 | Version 3.30 | Version 4.00 | Version 4.10 |
---|---|---|---|---|---|---|---|---|
gl_PointCoord | Y | Y | Y | Y | Y | Y | Y | Y |
Copyright © 2011 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/.