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 HEIGHTFIELD_TERRAIN_SHAPE_H
#define HEIGHTFIELD_TERRAIN_SHAPE_H

#include "btConcaveShape.h"


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
    {
        unsigned char*  m_heightfieldDataUnsignedChar;
        short*      m_heightfieldDataShort;
        btScalar*           m_heightfieldDataFloat;
        void*           m_heightfieldDataUnknown;
    };

    PHY_ScalarType  m_heightDataType;   
    bool    m_flipQuadEdges;
  bool  m_useDiamondSubdivision;

    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,
                    void* heightfieldData, btScalar heightScale,
                    btScalar minHeight, btScalar maxHeight, int upAxis,
                    PHY_ScalarType heightDataType, bool flipQuadEdges);

public:

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


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

    virtual ~btHeightfieldTerrainShape();


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


    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 //HEIGHTFIELD_TERRAIN_SHAPE_H