GL_POINTCOORD - Online Linux Manual Page

Section : 3G
Updated : 01/20/2022
Source : [FIXME: source]
Note : [FIXME: manual]
NAMEgl_PointCoord − contains the coordinate of a fragment within a point
DECLARATIONin ​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
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_PointCoord ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
SEE ALSOgl_FragCoord(), gl_FragDepth()
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