/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
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*==LICENSE==*/

#ifndef plVolumeIsect_inc
#define plVolumeIsect_inc

#include "hsGeometry3.h"
#include "hsMatrix44.h"
#include "hsTemplates.h"
#include "hsBounds.h"

#include "../pnFactory/plCreatable.h"

class hsBounds3Ext;

enum plVolumeCullResult
{
	kVolumeClear		= 0x0,
	kVolumeCulled		= 0x1,
	kVolumeSplit		= 0x2
};


class plVolumeIsect : public plCreatable
{
public:
	CLASSNAME_REGISTER( plVolumeIsect );
	GETINTERFACE_ANY( plVolumeIsect, plCreatable );

	virtual void SetTransform(const hsMatrix44& l2w, const hsMatrix44& w2l) = 0;
	virtual plVolumeCullResult	Test(const hsBounds3Ext& bnd) const = 0;	
	virtual hsScalar			Test(const hsPoint3& pos) const = 0;

	virtual void Read(hsStream* s, hsResMgr* mgr) = 0;
	virtual void Write(hsStream* s, hsResMgr* mgr) = 0;
};

class plSphereIsect : public plVolumeIsect
{
protected:
	hsPoint3			fCenter;
	hsPoint3			fWorldCenter;
	hsScalar			fRadius;
	hsPoint3			fMins;
	hsPoint3			fMaxs;
public:
	plSphereIsect();
	virtual ~plSphereIsect();

	CLASSNAME_REGISTER( plSphereIsect );
	GETINTERFACE_ANY( plSphereIsect, plVolumeIsect );

	void SetCenter(const hsPoint3& c);
	void SetRadius(hsScalar r);

	hsScalar GetRadius() const { return fRadius; }

	virtual void SetTransform(const hsMatrix44& l2w, const hsMatrix44& w2l);

	virtual plVolumeCullResult	Test(const hsBounds3Ext& bnd) const;	
	virtual hsScalar			Test(const hsPoint3& pos) const; // return 0 if point inside, else "distance" from pos to volume

	virtual void Read(hsStream* s, hsResMgr* mgr);
	virtual void Write(hsStream* s, hsResMgr* mgr);
};

class plConeIsect : public plVolumeIsect
{
protected:
	hsBool				fCapped;

	hsScalar			fRadAngle;
	hsScalar			fLength;

	hsPoint3			fWorldTip;
	hsVector3			fWorldNorm;

	hsMatrix44			fWorldToNDC;
	hsMatrix44			fLightToNDC;

	hsVector3			fNorms[5];
	hsScalar			fDists[5];

	void				ISetup();
public:

	plConeIsect();
	virtual ~plConeIsect();

	CLASSNAME_REGISTER( plConeIsect );
	GETINTERFACE_ANY( plConeIsect, plVolumeIsect );

	void SetAngle(hsScalar rads);
	void SetLength(hsScalar d);

	hsScalar GetLength() const { return fCapped ? fLength : 0; }
	hsScalar GetAngle() const { return fRadAngle; }

	virtual void SetTransform(const hsMatrix44& l2w, const hsMatrix44& w2l);

	virtual plVolumeCullResult	Test(const hsBounds3Ext& bnd) const;
	virtual hsScalar			Test(const hsPoint3& pos) const;

	virtual void Read(hsStream* s, hsResMgr* mgr);
	virtual void Write(hsStream* s, hsResMgr* mgr);
};

class plCylinderIsect : public plVolumeIsect
{
protected:
	hsPoint3		fTop;
	hsPoint3		fBot;
	hsScalar		fRadius;

	hsPoint3		fWorldBot;
	hsVector3		fWorldNorm;
	hsScalar		fLength;
	hsScalar		fMin;
	hsScalar		fMax;

	void ISetupCyl(const hsPoint3& wTop, const hsPoint3& wBot, hsScalar radius);

public:
	plCylinderIsect();
	virtual ~plCylinderIsect();

	CLASSNAME_REGISTER( plCylinderIsect );
	GETINTERFACE_ANY( plCylinderIsect, plVolumeIsect );

	void SetCylinder(const hsPoint3& lTop, const hsPoint3& lBot, hsScalar radius);
	void SetCylinder(const hsPoint3& lBot, const hsVector3& axis, hsScalar radius);

	virtual void SetTransform(const hsMatrix44& l2w, const hsMatrix44& w2l);

	virtual plVolumeCullResult	Test(const hsBounds3Ext& bnd) const;
	virtual hsScalar			Test(const hsPoint3& pos) const;

	virtual void Read(hsStream* s, hsResMgr* mgr);
	virtual void Write(hsStream* s, hsResMgr* mgr);
};

class plParallelIsect : public plVolumeIsect
{
protected:
	class ParPlane
	{
	public:
		hsVector3			fNorm;
		hsScalar			fMin;
		hsScalar			fMax;

		hsPoint3			fPosOne;
		hsPoint3			fPosTwo;
	};
	hsTArray<ParPlane>		fPlanes;

public:
	plParallelIsect();
	virtual ~plParallelIsect();

	CLASSNAME_REGISTER( plParallelIsect );
	GETINTERFACE_ANY( plParallelIsect, plVolumeIsect );

	void SetNumPlanes(int n); // each plane is really two parallel planes
	UInt16 GetNumPlanes() const { return fPlanes.GetCount(); }

	void SetPlane(int which, const hsPoint3& locPosOne, const hsPoint3& locPosTwo);

	virtual void SetTransform(const hsMatrix44& l2w, const hsMatrix44& w2l);

	virtual plVolumeCullResult	Test(const hsBounds3Ext& bnd) const;
	virtual hsScalar			Test(const hsPoint3& pos) const;

	virtual void Read(hsStream* s, hsResMgr* mgr);
	virtual void Write(hsStream* s, hsResMgr* mgr);
};

class plConvexIsect : public plVolumeIsect
{
protected:
	class SinglePlane
	{
	public:
		hsVector3		fNorm;
		hsScalar		fDist;
		hsPoint3		fPos;

		hsVector3		fWorldNorm;
		hsScalar		fWorldDist;
	};

	hsTArray<SinglePlane>	fPlanes;

public:
	plConvexIsect();
	virtual ~plConvexIsect();

	CLASSNAME_REGISTER( plConvexIsect );
	GETINTERFACE_ANY( plConvexIsect, plVolumeIsect );

	void ClearPlanes() { fPlanes.SetCount(0); }
	void AddPlaneUnchecked(const hsVector3& n, hsScalar dist); // no validation here
	void AddPlane(const hsVector3& n, const hsPoint3& p);
	UInt16 GetNumPlanes() const { return fPlanes.GetCount(); }

	virtual void SetTransform(const hsMatrix44& l2w, const hsMatrix44& w2l);

	virtual plVolumeCullResult	Test(const hsBounds3Ext& bnd) const;
	virtual hsScalar			Test(const hsPoint3& pos) const;

	virtual void Read(hsStream* s, hsResMgr* mgr);
	virtual void Write(hsStream* s, hsResMgr* mgr);
};

class plBoundsIsect : public plVolumeIsect
{
protected:
	hsBounds3Ext		fLocalBounds;
	hsBounds3Ext		fWorldBounds;
public:
	plBoundsIsect();
	virtual ~plBoundsIsect();

	CLASSNAME_REGISTER( plBoundsIsect );
	GETINTERFACE_ANY( plBoundsIsect, plVolumeIsect );

	void SetBounds(const hsBounds3Ext& bnd);

	virtual void SetTransform(const hsMatrix44& l2w, const hsMatrix44& w2l);

	virtual plVolumeCullResult	Test(const hsBounds3Ext& bnd) const;
	virtual hsScalar			Test(const hsPoint3& pos) const;

	virtual void Read(hsStream* s, hsResMgr* mgr);
	virtual void Write(hsStream* s, hsResMgr* mgr);
};

class plComplexIsect : public plVolumeIsect
{
protected:
	hsTArray<plVolumeIsect*>		fVolumes;

public:
	plComplexIsect();
	virtual ~plComplexIsect();

	CLASSNAME_REGISTER( plComplexIsect );
	GETINTERFACE_ANY( plComplexIsect, plVolumeIsect );

	void AddVolume(plVolumeIsect* v); // Will capture pointer
	UInt16 GetNumVolumes() const { return fVolumes.GetCount(); }

	virtual void SetTransform(const hsMatrix44& l2w, const hsMatrix44& w2l);

	virtual void Read(hsStream* s, hsResMgr* mgr);
	virtual void Write(hsStream* s, hsResMgr* mgr);
};

class plUnionIsect : public plComplexIsect
{
public:
	plUnionIsect();
	~plUnionIsect();

	CLASSNAME_REGISTER( plUnionIsect );
	GETINTERFACE_ANY( plUnionIsect, plComplexIsect );

	virtual plVolumeCullResult	Test(const hsBounds3Ext& bnd) const;
	virtual hsScalar			Test(const hsPoint3& pos) const;
};

class plIntersectionIsect : public plComplexIsect
{
public:
	plIntersectionIsect();
	~plIntersectionIsect();

	CLASSNAME_REGISTER( plIntersectionIsect );
	GETINTERFACE_ANY( plIntersectionIsect, plComplexIsect );

	virtual plVolumeCullResult	Test(const hsBounds3Ext& bnd) const;
	virtual hsScalar			Test(const hsPoint3& pos) const;
};

#endif // plVolumeIsect_inc