Function scene_update

Examples/StereoKitCTest/scene.cpp:19–29

	scene_curr = {};
}
void scene_update() {
	if (scene_next.init != nullptr) {
		scene_shutdown();
		scene_curr      = scene_next;
		scene_next = {};
		scene_init();
	}

	if (scene_curr.update != nullptr)
		scene_curr.update();
}
void scene_init() {
	if (scene_curr.init != nullptr)
		scene_curr.init();