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We don't want to use gl_PointCoord to implement point sprites on big GL because in that case we already use glTexEnv(GL_COORD_REPLACE) to replace the texture coords with the point sprite coords. Although GL also supports the gl_PointCoord variable, it requires GLSL 1.2 which would mean we would have to declare the GLSL version and check for it. We continue to use gl_PointCoord for GLES2 because it has no glTexEnv function.