Torque3D/Engine/source/lighting/shadowMap/pssmLightShadowMap.h

//-----------------------------------------------------------------------------
// Copyright (c) 2012 GarageGames, LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// IN THE SOFTWARE.
//-----------------------------------------------------------------------------
#ifndef _PSSMLIGHTSHADOWMAP_H_
#define _PSSMLIGHTSHADOWMAP_H_

#ifndef _LIGHTSHADOWMAP_H_
#include "lighting/shadowMap/lightShadowMap.h"
#endif
#ifndef _MATHUTIL_FRUSTUM_H_
#include "math/util/frustum.h"
#endif


class PSSMLightShadowMap : public LightShadowMap
{
   typedef LightShadowMap Parent;
public:
   PSSMLightShadowMap( LightInfo *light );

   // LightShadowMap
   virtual ShadowType getShadowType() const { return ShadowType_PSSM; }
   virtual void _render( RenderPassManager* renderPass, const SceneRenderState *diffuseState );
   virtual void setShaderParameters(GFXShaderConstBuffer* params, LightingShaderConstants* lsc);

   /// Used to scale TSShapeInstance::smDetailAdjust to have
   /// objects lod quicker when in the PSSM shadow.
   /// @see TSShapeInstance::smDetailAdjust
   static F32 smDetailAdjustScale;

   /// Like TSShapeInstance::smSmallestVisiblePixelSize this is used
   /// to define the smallest LOD to render.
   /// @see TSShapeInstance::smSmallestVisiblePixelSize
   static F32 smSmallestVisiblePixelSize;

protected:

   void _setNumSplits( U32 numSplits, U32 texSize );
   void _calcSplitPos(const Frustum& currFrustum);
   Box3F _calcClipSpaceAABB(const Frustum& f, const MatrixF& transform, F32 farDist);
   void _calcPlanesCullForShadowCasters(Vector< Vector<PlaneF> > &out, const Frustum &viewFrustum, const Point3F &_ligthDir);
   void _roundProjection(const MatrixF& lightMat, const MatrixF& cropMatrix, Point3F &offset, U32 splitNum);

   static const S32 MAX_SPLITS = 4;
   U32 mNumSplits;
   F32 mSplitDist[MAX_SPLITS+1];   // +1 because we store a cap
   RectI mViewports[MAX_SPLITS];
   Point3F mScaleProj[MAX_SPLITS];
   Point3F mOffsetProj[MAX_SPLITS];
   Point4F mFarPlaneScalePSSM;
   F32 mLogWeight;
};

#endif