/*************************************************************************/
/*  lod_manager.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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/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
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/*************************************************************************/

#ifndef LOD_MANAGER_H
#define LOD_MANAGER_H

#include "core/containers/local_vector.h"
#include "core/os/mutex.h"

class Camera;
class LOD;
struct Vector3;

class LODManager {
public:
	enum { NUM_LOD_QUEUES = 5 };

	void register_camera(Camera *p_camera);
	void remove_camera(Camera *p_camera);
	void register_lod(LOD *p_lod, uint32_t p_queue_id);
	void unregister_lod(LOD *p_lod, uint32_t p_queue_id);
	void update();

	void notify_saving(bool p_active);

	static void set_enabled(bool p_enabled) { _enabled = p_enabled; }
	static bool is_enabled() { return _enabled; }

private:
	void _update_queue(uint32_t p_queue_id, const Vector3 *p_camera_positions, uint32_t p_num_cameras);

	struct Queue {
		LocalVector<LOD *> lods;
		uint32_t lod_iterator = 0;
	};

	struct Data {
		LocalVector<Camera *> cameras;
		Queue queues[NUM_LOD_QUEUES];
		BinaryMutex mutex;
		bool saving = false;
	} data;

	static bool _enabled;
};

#endif // LOD_MANAGER_H