func Accum(op uint32, value float32) {
	C.glowAccum(gpAccum, (C.GLenum)(op), (C.GLfloat)(value))
}
func Accum(op uint32, value float32) {
	C.glowAccum(gpAccum, (C.GLenum)(op), (C.GLfloat)(value))
}
func Accum ( op uint32 , value float32 ) { C . glowAccum ( gpAccum , ( C . GLenum ) ( op ) , ( C . GLfloat ) ( value ) ) }
// operate on the accumulation buffer
operate on the accumulation buffer