OgreShadowCameraSetupFocused.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2012 Torus Knot Software Ltd
Copyright (c) 2006 Matthias Fink, netAllied GmbH <matthias.fink@web.de>                             

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
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __ShadowCameraSetupFocused_H__
#define __ShadowCameraSetupFocused_H__

#include "OgrePrerequisites.h"
#include "OgreShadowCameraSetup.h"
#include "OgrePolygon.h"
#include "OgreConvexBody.h"


namespace Ogre {

    class ConvexBody;

    class _OgreExport FocusedShadowCameraSetup : public ShadowCameraSetup
    {
    protected:
        static const Matrix4 msNormalToLightSpace;
        static const Matrix4 msLightSpaceToNormal;

        Frustum* mTempFrustum;

        Camera* mLightFrustumCamera;
        mutable bool mLightFrustumCameraCalculated;

        bool mUseAggressiveRegion;

        class _OgreExport PointListBody
        {
            Polygon::VertexList mBodyPoints;
            AxisAlignedBox      mAAB;

        public:
            PointListBody();
            PointListBody(const ConvexBody& body);
            ~PointListBody();

            void merge(const PointListBody& plb);

            void build(const ConvexBody& body, bool filterDuplicates = true);

            void buildAndIncludeDirection(const ConvexBody& body, 
                Real extrudeDist, const Vector3& dir);

            const AxisAlignedBox& getAAB(void) const;   

            void addPoint(const Vector3& point);

            void addAAB(const AxisAlignedBox& aab);

            const Vector3& getPoint(size_t cnt) const;

            size_t getPointCount(void) const;

            void reset(void);

        };

        // Persistent calculations to prevent reallocation
        mutable ConvexBody mBodyB;
        mutable PointListBody mPointListBodyB;
        mutable PointListBody mPointListBodyLVS;

    protected:
        void calculateShadowMappingMatrix(const SceneManager& sm, const Camera& cam, 
            const Light& light, Matrix4 *out_view, 
            Matrix4 *out_proj, Camera *out_cam) const;

        void calculateB(const SceneManager& sm, const Camera& cam, const Light& light, 
            const AxisAlignedBox& sceneBB, const AxisAlignedBox& receiverBB, PointListBody *out_bodyB) const;

        void calculateLVS(const SceneManager& sm, const Camera& cam, const Light& light,
            const AxisAlignedBox& sceneBB, PointListBody *out_LVS) const;

        Vector3 getLSProjViewDir(const Matrix4& lightSpace, const Camera& cam, 
            const PointListBody& bodyLVS) const;

        Vector3 getNearCameraPoint_ws(const Matrix4& viewMatrix, 
            const PointListBody& bodyLVS) const;

        Matrix4 transformToUnitCube(const Matrix4& m, const PointListBody& body) const;

        Matrix4 buildViewMatrix(const Vector3& pos, const Vector3& dir, const Vector3& up) const;

    public:
        FocusedShadowCameraSetup(void);

        virtual ~FocusedShadowCameraSetup(void);

        virtual void getShadowCamera(const SceneManager *sm, const Camera *cam, 
            const Viewport *vp, const Light *light, Camera *texCam, size_t iteration) const;

        void setUseAggressiveFocusRegion(bool aggressive) { mUseAggressiveRegion = aggressive; }

        bool getUseAggressiveFocusRegion() const { return mUseAggressiveRegion; }

    };

}

#endif