btTriangleIndexVertexArray.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_TRIANGLE_INDEX_VERTEX_ARRAY_H
#define BT_TRIANGLE_INDEX_VERTEX_ARRAY_H
 
#include "btStridingMeshInterface.h"
#include "LinearMath/btAlignedObjectArray.h"
#include "LinearMath/btScalar.h"

ATTRIBUTE_ALIGNED16(struct)
btIndexedMesh
{
    BT_DECLARE_ALIGNED_ALLOCATOR();
 
    int m_numTriangles;
    const unsigned char* m_triangleIndexBase;
    // Size in byte of the indices for one triangle (3*sizeof(index_type) if the indices are tightly packed)
    int m_triangleIndexStride;
    int m_numVertices;
    const unsigned char* m_vertexBase;
    // Size of a vertex, in bytes
    int m_vertexStride;
 
    // The index type is set when adding an indexed mesh to the
    // btTriangleIndexVertexArray, do not set it manually
    PHY_ScalarType m_indexType;
 
    // The vertex type has a default type similar to Bullet's precision mode (float or double)
    // but can be set manually if you for example run Bullet with double precision but have
    // mesh data in single precision..
    PHY_ScalarType m_vertexType;
 
    btIndexedMesh()
        : m_indexType(PHY_INTEGER),
#ifdef BT_USE_DOUBLE_PRECISION
          m_vertexType(PHY_DOUBLE)
#else   // BT_USE_DOUBLE_PRECISION
          m_vertexType(PHY_FLOAT)
#endif  // BT_USE_DOUBLE_PRECISION
    {
    }
};
 
typedef btAlignedObjectArray<btIndexedMesh> IndexedMeshArray;

ATTRIBUTE_ALIGNED16(class)
btTriangleIndexVertexArray : public btStridingMeshInterface
{
protected:
    IndexedMeshArray m_indexedMeshes;
    int m_pad[2];
    mutable int m_hasAabb;  // using int instead of bool to maintain alignment
    mutable btVector3 m_aabbMin;
    mutable btVector3 m_aabbMax;
 
public:
    BT_DECLARE_ALIGNED_ALLOCATOR();
 
    btTriangleIndexVertexArray() : m_hasAabb(0)
    {
    }
 
    virtual ~btTriangleIndexVertexArray();
 
    //just to be backwards compatible
    btTriangleIndexVertexArray(int numTriangles, int* triangleIndexBase, int triangleIndexStride, int numVertices, btScalar* vertexBase, int vertexStride);
 
    void addIndexedMesh(const btIndexedMesh& mesh, PHY_ScalarType indexType = PHY_INTEGER)
    {
        m_indexedMeshes.push_back(mesh);
        m_indexedMeshes[m_indexedMeshes.size() - 1].m_indexType = indexType;
    }
 
    virtual void getLockedVertexIndexBase(unsigned char** vertexbase, int& numverts, PHY_ScalarType& type, int& vertexStride, unsigned char** indexbase, int& indexstride, int& numfaces, PHY_ScalarType& indicestype, int subpart = 0);
 
    virtual void getLockedReadOnlyVertexIndexBase(const unsigned char** vertexbase, int& numverts, PHY_ScalarType& type, int& vertexStride, const unsigned char** indexbase, int& indexstride, int& numfaces, PHY_ScalarType& indicestype, int subpart = 0) const;

    virtual void unLockVertexBase(int subpart) { (void)subpart; }
 
    virtual void unLockReadOnlyVertexBase(int subpart) const { (void)subpart; }

    virtual int getNumSubParts() const
    {
        return (int)m_indexedMeshes.size();
    }
 
    IndexedMeshArray& getIndexedMeshArray()
    {
        return m_indexedMeshes;
    }
 
    const IndexedMeshArray& getIndexedMeshArray() const
    {
        return m_indexedMeshes;
    }
 
    virtual void preallocateVertices(int numverts) { (void)numverts; }
    virtual void preallocateIndices(int numindices) { (void)numindices; }
 
    virtual bool hasPremadeAabb() const;
    virtual void setPremadeAabb(const btVector3& aabbMin, const btVector3& aabbMax) const;
    virtual void getPremadeAabb(btVector3 * aabbMin, btVector3 * aabbMax) const;
};
 
#endif  //BT_TRIANGLE_INDEX_VERTEX_ARRAY_H