/*==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.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/

#ifndef plCutter_inc
#define plCutter_inc

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

#include "hsGeometry3.h"
#include "hsTemplates.h"
#include "hsBounds.h"
#include "../plIntersect/plVolumeIsect.h"
#include "hsColorRGBA.h"

struct hsPoint3;
struct hsVector3;

class plPrintCollect;
class plAccTriIterator;
class plAccessSpan;

class plCutoutHit
{
public:
	hsPoint3	fPos;
	hsVector3	fNorm;
};

class plCutoutVtx
{
public:
	plCutoutVtx& Init(const hsPoint3& p, const hsVector3& n, const hsColorRGBA& c) { fPos = p; fNorm = n; fColor = c; return *this; }

	hsPoint3	fPos;
	hsVector3	fNorm;
	hsColorRGBA	fColor;
	hsPoint3	fUVW;
};

class plCutoutPoly
{
public:
	hsTArray<plCutoutVtx>		fVerts;

	hsBool						fBaseHasAlpha;
};

class plCutoutMiniVtx
{
public:
	hsPoint3	fPos;
	hsPoint3	fUVW;
};

class plFlatGridMesh
{
public:
	hsTArray<plCutoutMiniVtx>	fVerts;
	hsTArray<UInt16>			fIdx;

	void Reset() { fVerts.SetCount(0); fIdx.SetCount(0); }
};

class plCutter : public plCreatable
{
protected:

	// Permanent attributes
	hsScalar fLengthU;
	hsScalar fLengthV;
	hsScalar fLengthW;

	// Internal cached stuff
	hsScalar		fDistU;
	hsScalar		fDistV;
	hsScalar		fDistW;
	hsVector3		fDirU;
	hsVector3		fDirV;
	hsVector3		fDirW;
	hsVector3		fBackDir;

	hsBounds3Ext	fWorldBounds;
	plBoundsIsect	fIsect;

	void			IConstruct(hsTArray<plCutoutPoly>& dst, hsTArray<plCutoutVtx>& poly, hsBool baseHasAlpha) const;
	hsBool			IPolyClip(hsTArray<plCutoutVtx>& poly, const hsPoint3 vPos[]) const;
	
	inline void		ICutoutVtxHiU(const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;
	inline void		ICutoutVtxHiV(const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;
	inline void		ICutoutVtxHiW(const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;
	inline void		ICutoutVtxLoU(const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;
	inline void		ICutoutVtxLoV(const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;
	inline void		ICutoutVtxLoW(const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;
	inline void		ICutoutVtxMidV(const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;
	inline void		ICutoutVtxMidU(const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;
	inline void		ICutoutVtxMidW(const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;

	hsBool			IFindHitPoint(const hsTArray<plCutoutVtx>& inPoly, plCutoutHit& hit) const;

	inline void		ISetPosNorm(hsScalar parm, const plCutoutVtx& inVtx, const plCutoutVtx& outVtx, plCutoutVtx& dst) const;

	void			ICutoutTransformed(plAccessSpan& src, hsTArray<plCutoutPoly>& dst) const;
	void			ICutoutConstHeight(plAccessSpan& src, hsTArray<plCutoutPoly>& dst) const;
	void			ICutoutTransformedConstHeight(plAccessSpan& src, hsTArray<plCutoutPoly>& dst) const;


public:
	plCutter() {}
	virtual ~plCutter() {}

	CLASSNAME_REGISTER( plCutter );
	GETINTERFACE_ANY( plCutter, plCreatable );


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

	hsBool		FindHitPoints(const hsTArray<plCutoutPoly>& src, hsTArray<plCutoutHit>& hits) const;
	hsBool		FindHitPointsConstHeight(const hsTArray<plCutoutPoly>& src, hsTArray<plCutoutHit>& hits, hsScalar height) const;

	void		Set(const hsPoint3& pos, const hsVector3& dir, const hsVector3& out, hsBool flip=false);

	void		Cutout(plAccessSpan& src, hsTArray<plCutoutPoly>& dst) const;
	hsBool		CutoutGrid(int nWid, int nLen, plFlatGridMesh& dst) const;

	void		SetLength(const hsVector3& s) { fLengthU = s.fX; fLengthV = s.fY; fLengthW = s.fZ; }
	hsScalar	GetLengthU() const { return fLengthU; }
	hsScalar	GetLengthV() const { return fLengthV; }
	hsScalar	GetLengthW() const { return fLengthW; }

	const hsBounds3Ext& GetWorldBounds() const { return fWorldBounds; }
	plBoundsIsect& GetIsect() { return fIsect; }
	hsVector3 GetBackDir() const { return fBackDir; }

	static hsBool MakeGrid(int nWid, int nLen, const hsPoint3& center, const hsVector3& halfU, const hsVector3& halfV, plFlatGridMesh& grid);

};

#endif // plCutter_inc