/*==========================================================================
 *	(C) 2006 Universidad Jaime I de Castellón
 *==========================================================================
 *	PROYECT:	GAME TOOLS
 *==========================================================================*/
/*	CONTENT:
 *
 *
 *	@file	GeoLodManager.h
 *==========================================================================*/

#ifndef _GEOLODMANAGER
#define _GEOLODMANAGER

#include "GeoVector3.h"
#include "GeoLodObject.h"
#include <map>
#include <vector>

namespace Geometry
{
	class lodobj_dist_node_t
	{
	public:
		lodobj_dist_node_t(float dist, LodObject *o):dist2cam(dist),lodobj(o){ must_recalculate_distance=false; }
		float dist2cam;
		LodObject *lodobj;
		bool must_recalculate_distance;
		bool operator < (const lodobj_dist_node_t &o) const { return (dist2cam < o.dist2cam); }
	};

	class LodManager
	{	
	public:
		LodManager(float near, float far, const Geometry::Vector3 &campos);
		void AddLodObj(LodObject*, const Geometry::Vector3 &);
		void UpdateLOD(void);
		void UpdateCamera(const Geometry::Vector3 &);
		void UpdateLODObjectPos(LodObject*,const Geometry::Vector3 &);
	private:
		std::vector<lodobj_dist_node_t> lodobj_dists; // key: dist2cam for efficient distance finding
		std::map<uint32,Geometry::Vector3> lodobj_pos; // map key: LodObject UniqueID for efficient ID-based finding
		unsigned int targetFPS;
		Vector3 camera_pos;
		bool camera_changed;
		float near_range, far_range;
		float CalculateDistToCamera(const Geometry::Vector3 &) const;
		float SelectRandomDistance(void) const;
		void RecalculateDist(lodobj_dist_node_t & node);
	};
};

#endif