gl_PointCoord — contains the coordinate of a fragment within a point
in vec2 gl_PointCoord ;
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_PointCoord.t varies from 0.0 to 1.0 vertically from bottom to top. Otherwise, if
gl_PointCoord.t varies from 0.0 to 1.0 vertically from top to bottom. The default value of
|OpenGL Shading Language Version|
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