func Accum(op uint32, value float32) {
	syscall.Syscall(gpAccum, 2, uintptr(op), uintptr(math.Float32bits(value)), 0)
}
func Accum(op uint32, value float32) {
	syscall.Syscall(gpAccum, 2, uintptr(op), uintptr(math.Float32bits(value)), 0)
}
func Accum ( op uint32 , value float32 ) { syscall . Syscall ( gpAccum , 2 , uintptr ( op ) , uintptr ( math . Float32bits ( value ) ) , 0 ) }
// operate on the accumulation buffer
operate on the accumulation buffer