2011 Khronos Group
gl_PointCoord 3G
gl_PointCoord contains the coordinate of a fragment within a point

## Declaration

`in vec2 gl_PointCoord;`

## 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

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

## See Also

gl_FragCoord, gl_FragDepth

## Copyright

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/.