// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
// Copyright (C) 2010  Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#ifndef NL_SHADOW_SKIN_H
#define NL_SHADOW_SKIN_H

#include "nel/misc/types_nl.h"
#include "nel/misc/stream.h"
#include "nel/misc/vector.h"
#include "nel/3d/matrix_3x4.h"

namespace NL3D
{


// ***************************************************************************
/**
 * Vertex for CShadowSkin
 */
class		CShadowVertex
{
public:
	CVector		Vertex;
	uint32		MatrixId;
	void		serial(NLMISC::IStream &f)
	{
		(void)f.serialVersion(0);

		f.serial(Vertex);
		f.serial(MatrixId);
	}

	// operator for sort
	bool		operator==(const CShadowVertex &v) const
	{
		return MatrixId==v.MatrixId && Vertex==v.Vertex;
	}
	bool		operator<(const CShadowVertex &v) const
	{
		if(MatrixId!=v.MatrixId)
			return MatrixId<v.MatrixId;
		else
			return Vertex<v.Vertex;
	}
};


// ***************************************************************************
/**
 * Simple Skinning for shadow map rendering
 * \author Lionel Berenguier
 * \author Nevrax France
 * \date 2004
 */
class CShadowSkin
{
public:
	std::vector<CShadowVertex>		Vertices;
	std::vector<uint32>				Triangles;

public:

	// skinning
	void		applySkin(NLMISC::CVector *dst, std::vector<CMatrix3x4> &boneMat3x4);

	/** return ray intersection.
 	 *	\return false if no triangles, true if can do the test (even if don't intersect!)
	 *	if intersect, dist2D=0, and distZ= Depth Distance
	 *	if don't intersect, dist2D="nearest distance to the ray", and distZ=0
	 *	\param computeDist2D if false and don't intersect, then return dist2D=FLT_MAX, and distZ=0
	 */
	bool		getRayIntersection(const CMatrix &toRaySpace, class CSkeletonModel &skeleton,
		const std::vector<uint32> &matrixInfluences, float &dist2D, float &distZ, bool computeDist2D);

private:
	static  uint	NumCacheVertexShadow;

};


} // NL3D


#endif // NL_SHADOW_SKIN_H

/* End of shadow_skin.h */