/** 
 * @file llvolumeoctree.h
 * @brief LLVolume octree classes.
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_LLVOLUME_OCTREE_H
#define LL_LLVOLUME_OCTREE_H

#include "linden_common.h"
#include "llmemory.h"

#include "lloctree.h"
#include "llvolume.h"
#include "llvector4a.h"

class LLVolumeTriangle : public LLRefCount
{
public:
	LLVolumeTriangle()
	{
		mBinIndex = -1;	
	}

	LLVolumeTriangle(const LLVolumeTriangle& rhs)
	{
		*this = rhs;
	}

	const LLVolumeTriangle& operator=(const LLVolumeTriangle& rhs)
	{
		llerrs << "Illegal operation!" << llendl;
		return *this;
	}

	~LLVolumeTriangle()
	{
	
	}

	LLVector4a mPositionGroup;

	const LLVector4a* mV[3];
	U16 mIndex[3];

	F32 mRadius;
	mutable S32 mBinIndex;


	virtual const LLVector4a& getPositionGroup() const;
	virtual const F32& getBinRadius() const;
	
	S32 getBinIndex() const { return mBinIndex; }
	void setBinIndex(S32 idx) const { mBinIndex = idx; }


};

class LLVolumeOctreeListener : public LLOctreeListener<LLVolumeTriangle>
{
public:
	
	LLVolumeOctreeListener(LLOctreeNode<LLVolumeTriangle>* node);
	~LLVolumeOctreeListener();
	
	LLVolumeOctreeListener(const LLVolumeOctreeListener& rhs)
	{
		*this = rhs;
	}

	const LLVolumeOctreeListener& operator=(const LLVolumeOctreeListener& rhs)
	{
		llerrs << "Illegal operation!" << llendl;
		return *this;
	}

	 //LISTENER FUNCTIONS
	virtual void handleChildAddition(const LLOctreeNode<LLVolumeTriangle>* parent, 
		LLOctreeNode<LLVolumeTriangle>* child);
	virtual void handleStateChange(const LLTreeNode<LLVolumeTriangle>* node) { }
	virtual void handleChildRemoval(const LLOctreeNode<LLVolumeTriangle>* parent, 
			const LLOctreeNode<LLVolumeTriangle>* child) {	}
	virtual void handleInsertion(const LLTreeNode<LLVolumeTriangle>* node, LLVolumeTriangle* tri) { }
	virtual void handleRemoval(const LLTreeNode<LLVolumeTriangle>* node, LLVolumeTriangle* tri) { }
	virtual void handleDestruction(const LLTreeNode<LLVolumeTriangle>* node) { }
	

public:
	LLVector4a mBounds[2]; // bounding box (center, size) of this node and all its children (tight fit to objects)
	LLVector4a mExtents[2]; // extents (min, max) of this node and all its children
};

class LLOctreeTriangleRayIntersect : public LLOctreeTraveler<LLVolumeTriangle>
{
public:
	const LLVolumeFace* mFace;
	LLVector4a mStart;
	LLVector4a mDir;
	LLVector4a mEnd;
	LLVector3* mIntersection;
	LLVector2* mTexCoord;
	LLVector3* mNormal;
	LLVector3* mBinormal;
	F32* mClosestT;
	bool mHitFace;

	LLOctreeTriangleRayIntersect(const LLVector4a& start, const LLVector4a& dir, 
								   const LLVolumeFace* face, F32* closest_t,
								   LLVector3* intersection,LLVector2* tex_coord, LLVector3* normal, LLVector3* bi_normal);

	void traverse(const LLOctreeNode<LLVolumeTriangle>* node);

	virtual void visit(const LLOctreeNode<LLVolumeTriangle>* node);
};

class LLVolumeOctreeValidate : public LLOctreeTraveler<LLVolumeTriangle>
{
	virtual void visit(const LLOctreeNode<LLVolumeTriangle>* branch);
};

#endif