func GetClipPlane(plane uint32, equation *float64) {
	syscall.Syscall(gpGetClipPlane, 2, uintptr(plane), uintptr(unsafe.Pointer(equation)), 0)
}
func GetClipPlane(plane uint32, equation *float64) {
	syscall.Syscall(gpGetClipPlane, 2, uintptr(plane), uintptr(unsafe.Pointer(equation)), 0)
}
func GetClipPlane ( plane uint32 , equation * float64 ) { syscall . Syscall ( gpGetClipPlane , 2 , uintptr ( plane ) , uintptr ( unsafe . Pointer ( equation ) ) , 0 ) }
// return the coefficients of the specified clipping plane
return the coefficients of the specified clipping plane