/*==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 plShadowSlave_inc
#define plShadowSlave_inc

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

class plShadowCaster;
class plVolumeIsect;
class plPipeline;

class plShadowSlave
{
public:

	UInt32				fIndex;

	hsMatrix44			fWorldToLight;
	hsMatrix44			fLightToWorld;

	hsPoint3			fLightPos;
	hsVector3			fLightDir;

	hsMatrix44			fWorldToTexture;
	hsMatrix44			fCastLUT;
	hsMatrix44			fRcvLUT;

	plViewTransform		fView;

	hsScalar			fPower;
	hsScalar			fBlurScale;

	hsBounds3Ext		fCasterWorldBounds;
	hsBounds3Ext		fWorldBounds;

	plVolumeIsect*		fIsect;

	UInt32				fWidth;
	UInt32				fHeight;

	hsScalar			fAttenDist;

	hsScalar			fPriority;

	UInt32				fFlags;

	enum SlaveFlag
	{
		kObeysLightGroups		= 0x1,
		kIncludesChars			= 0x2,
		kSelfShadow				= 0x4,
		kCastInCameraSpace		= 0x8,
		kReverseZ				= 0x10,
		kTwoSided				= 0x20,
		kReverseCull			= 0x40,
		kPositional				= 0x80
	};

	void SetFlag(SlaveFlag f, hsBool on) { if(on) fFlags |= f; else fFlags &= ~f; }
	hsBool HasFlag(SlaveFlag f) const { return 0 != (fFlags & f); }

	hsBool ObeysLightGroups() const { return HasFlag(kObeysLightGroups); }
	hsBool IncludesChars() const { return HasFlag(kIncludesChars); }
	hsBool SelfShadow() const { return HasFlag(kSelfShadow); }
	hsBool CastInCameraSpace() const { return HasFlag(kCastInCameraSpace); }
	hsBool ReverseZ() const { return HasFlag(kReverseZ); }
	hsBool TwoSided() const { return HasFlag(kTwoSided); }
	hsBool ReverseCull() const { return HasFlag(kReverseCull); }
	hsBool Positional() const { return HasFlag(kPositional); }

	virtual void Init() { fFlags = 0; }

	const plShadowCaster*		fCaster;

	// Internal to pipeline, no touch!!!
	int							fLightIndex;
	int							fLightRefIdx;
	int							fSelfShadowOn;
	void*						fPipeData; 

	bool				ISetupOrthoViewTransform();
	bool				ISetupPerspViewTransform();

	virtual bool		SetupViewTransform(plPipeline* pipe) = 0;
};

class plDirectShadowSlave : public plShadowSlave
{
	virtual bool		SetupViewTransform(plPipeline* pipe) { return ISetupOrthoViewTransform(); }
};

class plPointShadowSlave : public plShadowSlave
{
	virtual bool		SetupViewTransform(plPipeline* pipe) { return ISetupPerspViewTransform(); }
};

#endif // plShadowSlave_inc