/*
 *	OPCODE - Optimized Collision Detection
 * http://www.codercorner.com/Opcode.htm
 * 
 * Copyright (c) 2001-2008 Pierre Terdiman,  pierre@codercorner.com

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Contains code for an AABB collider.
 *	\file		OPC_AABBCollider.h
 *	\author		Pierre Terdiman
 *	\date		January, 1st, 2002
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Include Guard
#ifndef __OPC_AABBCOLLIDER_H__
#define __OPC_AABBCOLLIDER_H__

	struct OPCODE_API AABBCache : VolumeCache
	{
						AABBCache() : FatCoeff(1.1f)
						{
							FatBox.mCenter.Zero();
							FatBox.mExtents.Zero();
						}

		// Cached faces signature
		CollisionAABB	FatBox;		//!< Box used when performing the query resulting in cached faces
		// User settings
		float			FatCoeff;	//!< mRadius2 multiplier used to create a fat sphere
	};

	class OPCODE_API AABBCollider : public VolumeCollider
	{
		public:
		// Constructor / Destructor
											AABBCollider();
		virtual								~AABBCollider();

		///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
		/**
		 *	Generic collision query for generic OPCODE models. After the call, access the results:
		 *	- with GetContactStatus()
		 *	- with GetNbTouchedPrimitives()
		 *	- with GetTouchedPrimitives()
		 *
		 *	\param		cache			[in/out] a box cache
		 *	\param		box				[in] collision AABB in world space
		 *	\param		model			[in] Opcode model to collide with
		 *	\return		true if success
		 *	\warning	SCALE NOT SUPPORTED. The matrices must contain rotation & translation parts only.
		 */
		///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
							bool			Collide(AABBCache& cache, const CollisionAABB& box, const Model& model);
		//
							bool			Collide(AABBCache& cache, const CollisionAABB& box, const AABBTree* tree);
		protected:
							CollisionAABB	mBox;			//!< Query box in (center, extents) form
							Point			mMin;			//!< Query box min point
							Point			mMax;			//!< Query box max point
		// Leaf description
							Point			mLeafVerts[3];	//!< Triangle vertices
		// Internal methods
							void			_Collide(const AABBCollisionNode* node);
							void			_Collide(const AABBNoLeafNode* node);
							void			_Collide(const AABBQuantizedNode* node);
							void			_Collide(const AABBQuantizedNoLeafNode* node);
							void			_Collide(const AABBTreeNode* node);
							void			_CollideNoPrimitiveTest(const AABBCollisionNode* node);
							void			_CollideNoPrimitiveTest(const AABBNoLeafNode* node);
							void			_CollideNoPrimitiveTest(const AABBQuantizedNode* node);
							void			_CollideNoPrimitiveTest(const AABBQuantizedNoLeafNode* node);
			// Overlap tests
		inline_				BOOL			AABBContainsBox(const Point& bc, const Point& be);
		inline_				BOOL			AABBAABBOverlap(const Point& b, const Point& Pb);
		inline_				BOOL			TriBoxOverlap();
			// Init methods
							BOOL			InitQuery(AABBCache& cache, const CollisionAABB& box);
	};

	class OPCODE_API HybridAABBCollider : public AABBCollider
	{
		public:
		// Constructor / Destructor
											HybridAABBCollider();
		virtual								~HybridAABBCollider();

							bool			Collide(AABBCache& cache, const CollisionAABB& box, const HybridModel& model);
		protected:
							Container		mTouchedBoxes;
	};

#endif // __OPC_AABBCOLLIDER_H__