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Contains the coordinate of a fragment within a point.



gl_PointCoordis 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 fromgl_PointCoordare undefined.

gl_PointCoord.sranges 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.tvaries from 0.0 to 1.0 vertically from bottom to top. Otherwise, if GL_POINT_SPRITE_COORD_ORIGIN is GL_UPPER_LEFT thengl_PointCoord.tvaries 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[edit]

gl_PointCoord 1.1+

See Also[edit]

 gl_FragCoord , gl_FragDepth 


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.