gl_PointCoord — contains the coordinate of a fragment within a point
in mediump 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
gl_PointCoord are undefined.
gl_PointCoord.s ranges from 0.0 to 1.0 across the point horizontally
from left to right.
from 0.0 to 1.0 vertically from top to bottom.
|OpenGL ES Shading Language Version|
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. https://opencontent.org/openpub/.