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.
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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
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| gl_PointCoord | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
✔
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gl_FragCoord(), gl_FragDepth()
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