/*************************************************************************/
/*  lod.h                                                                */
/*************************************************************************/
/*                         This file is part of:                         */
/*                          PANDEMONIUM ENGINE                           */
/*             https://github.com/Relintai/pandemonium_engine            */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar.                              */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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/*************************************************************************/

#ifndef LOD_H
#define LOD_H

#include "scene/main/spatial.h"

class LOD : public Spatial {
	GDCLASS(LOD, Spatial);

	struct LODChild {
		float distance;
		int32_t child_id;
	};

	struct Data {
		LocalVector<LODChild> lod_children;
		int32_t current_lod_child = 0;
		float hysteresis = 1.0f;
		int32_t queue_id = 0;
		const Spatial *current_lod_node = nullptr;
		bool registered = false;
	} data;

	friend class LODManager;
	bool _lod_update(float p_camera_dist_squared);
	void _lod_pre_save();
	void _update_child_distances();

	void _lod_register();
	void _lod_unregister();

protected:
	void _notification(int p_what);
	static void _bind_methods();

public:
	void set_hysteresis(real_t p_distance);
	real_t get_hysteresis() const { return data.hysteresis; }

	void set_lod_priority(int p_priority);
	int get_lod_priority() const { return data.queue_id; }
};

#endif // LOD_H