func DrawTransformFeedbackInstanced(mode uint32, id uint32, instancecount int32) {
	syscall.Syscall(gpDrawTransformFeedbackInstanced, 3, uintptr(mode), uintptr(id), uintptr(instancecount))
}
func DrawTransformFeedbackInstanced(mode uint32, id uint32, instancecount int32) {
	syscall.Syscall(gpDrawTransformFeedbackInstanced, 3, uintptr(mode), uintptr(id), uintptr(instancecount))
}
// render multiple instances of primitives using a count derived from a transform feedback object