btHeightfieldTerrainShape.h

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/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2009 Erwin Coumans  http://bulletphysics.org

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/

#ifndef BT_HEIGHTFIELD_TERRAIN_SHAPE_H
#define BT_HEIGHTFIELD_TERRAIN_SHAPE_H

#include "btConcaveShape.h"


ATTRIBUTE_ALIGNED16(class) btHeightfieldTerrainShape : public btConcaveShape
{
protected:
        btVector3       m_localAabbMin;
        btVector3       m_localAabbMax;
        btVector3       m_localOrigin;

        int     m_heightStickWidth;
        int m_heightStickLength;
        btScalar        m_minHeight;
        btScalar        m_maxHeight;
        btScalar m_width;
        btScalar m_length;
        btScalar m_heightScale;
        union
        {
                const unsigned char*    m_heightfieldDataUnsignedChar;
                const short*            m_heightfieldDataShort;
                const btScalar*                 m_heightfieldDataFloat;
                const void*     m_heightfieldDataUnknown;
        };

        PHY_ScalarType  m_heightDataType;       
        bool    m_flipQuadEdges;
        bool  m_useDiamondSubdivision;
        bool m_useZigzagSubdivision;

        int     m_upAxis;
        
        btVector3       m_localScaling;

        virtual btScalar        getRawHeightFieldValue(int x,int y) const;
        void            quantizeWithClamp(int* out, const btVector3& point,int isMax) const;
        void            getVertex(int x,int y,btVector3& vertex) const;




        void initialize(int heightStickWidth, int heightStickLength,
                        const void* heightfieldData, btScalar heightScale,
                        btScalar minHeight, btScalar maxHeight, int upAxis,
                        PHY_ScalarType heightDataType, bool flipQuadEdges);

public:
        
        BT_DECLARE_ALIGNED_ALLOCATOR();
        

        btHeightfieldTerrainShape(int heightStickWidth,int heightStickLength,
                                  const void* heightfieldData, btScalar heightScale,
                                  btScalar minHeight, btScalar maxHeight,
                                  int upAxis, PHY_ScalarType heightDataType,
                                  bool flipQuadEdges);


        btHeightfieldTerrainShape(int heightStickWidth,int heightStickLength,const void* heightfieldData, btScalar maxHeight,int upAxis,bool useFloatData,bool flipQuadEdges);

        virtual ~btHeightfieldTerrainShape();


        void setUseDiamondSubdivision(bool useDiamondSubdivision=true) { m_useDiamondSubdivision = useDiamondSubdivision;}

        void setUseZigzagSubdivision(bool useZigzagSubdivision=true) { m_useZigzagSubdivision = useZigzagSubdivision;}

        virtual void getAabb(const btTransform& t,btVector3& aabbMin,btVector3& aabbMax) const;

        virtual void    processAllTriangles(btTriangleCallback* callback,const btVector3& aabbMin,const btVector3& aabbMax) const;

        virtual void    calculateLocalInertia(btScalar mass,btVector3& inertia) const;

        virtual void    setLocalScaling(const btVector3& scaling);
        
        virtual const btVector3& getLocalScaling() const;
        
        //debugging
        virtual const char*     getName()const {return "HEIGHTFIELD";}

};

#endif //BT_HEIGHTFIELD_TERRAIN_SHAPE_H