func GetMultisamplefv(pname uint32, index uint32, val *float32) {
	syscall.Syscall(gpGetMultisamplefv, 3, uintptr(pname), uintptr(index), uintptr(unsafe.Pointer(val)))
}
func GetMultisamplefv(pname uint32, index uint32, val *float32) {
	syscall.Syscall(gpGetMultisamplefv, 3, uintptr(pname), uintptr(index), uintptr(unsafe.Pointer(val)))
}
func GetMultisamplefv ( pname uint32 , index uint32 , val * float32 ) { syscall . Syscall ( gpGetMultisamplefv , 3 , uintptr ( pname ) , uintptr ( index ) , uintptr ( unsafe . Pointer ( val ) ) ) }
// retrieve the location of a sample
retrieve the location of a sample