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 are undefined.

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 , varies from 0.0 to 1.0 vertically from bottom to top. Otherwise, if GL_POINT_SPRITE_COORD_ORIGIN is GL_UPPER_LEFT then 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 .

gl_FragCoord , gl_FragDepth

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