#ifndef LOD_H
#define LOD_H

/*************************************************************************/
/*  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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/* a copy of this software and associated documentation files (the       */
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/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#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