func IsRenderbuffer(renderbuffer uint32) bool {
	ret, _, _ := syscall.Syscall(gpIsRenderbuffer, 1, uintptr(renderbuffer), 0, 0)
	return ret != 0
}
func IsRenderbuffer(renderbuffer uint32) bool {
	ret, _, _ := syscall.Syscall(gpIsRenderbuffer, 1, uintptr(renderbuffer), 0, 0)
	return ret != 0
}
// determine if a name corresponds to a renderbuffer object