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btStridingMeshInterface.h

/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/

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 STRIDING_MESHINTERFACE_H
#define STRIDING_MESHINTERFACE_H

#include "LinearMath/btVector3.h"
#include "btTriangleCallback.h"

/// PHY_ScalarType enumerates possible scalar types.
/// See the btStridingMeshInterface for its use
typedef enum PHY_ScalarType {
      PHY_FLOAT,
      PHY_DOUBLE,
      PHY_INTEGER,
      PHY_SHORT,
      PHY_FIXEDPOINT88
} PHY_ScalarType;

///   btStridingMeshInterface is the interface class for high performance access to triangle meshes
/// It allows for sharing graphics and collision meshes. Also it provides locking/unlocking of graphics meshes that are in gpu memory.
00034 class  btStridingMeshInterface
{
      protected:
      
            btVector3 m_scaling;

      public:
            btStridingMeshInterface() :m_scaling(1.f,1.f,1.f)
            {

            }

            virtual ~btStridingMeshInterface();



            void  InternalProcessAllTriangles(btInternalTriangleIndexCallback* callback,const btVector3& aabbMin,const btVector3& aabbMax) const;


            /// get read and write access to a subpart of a triangle mesh
            /// this subpart has a continuous array of vertices and indices
            /// in this way the mesh can be handled as chunks of memory with striding
            /// very similar to OpenGL vertexarray support
            /// make a call to unLockVertexBase when the read and write access is finished      
            virtual void      getLockedVertexIndexBase(unsigned char **vertexbase, int& numverts,PHY_ScalarType& type, int& stride,unsigned char **indexbase,int & indexstride,int& numfaces,PHY_ScalarType& indicestype,int subpart=0)=0;
            
            virtual void      getLockedReadOnlyVertexIndexBase(const unsigned char **vertexbase, int& numverts,PHY_ScalarType& type, int& stride,const unsigned char **indexbase,int & indexstride,int& numfaces,PHY_ScalarType& indicestype,int subpart=0) const=0;
      
            /// unLockVertexBase finishes the access to a subpart of the triangle mesh
            /// make a call to unLockVertexBase when the read and write access (using getLockedVertexIndexBase) is finished
            virtual void      unLockVertexBase(int subpart)=0;

            virtual void      unLockReadOnlyVertexBase(int subpart) const=0;


            /// getNumSubParts returns the number of seperate subparts
            /// each subpart has a continuous array of vertices and indices
            virtual int       getNumSubParts() const=0;

            virtual void      preallocateVertices(int numverts)=0;
            virtual void      preallocateIndices(int numindices)=0;

            const btVector3&  getScaling() const {
                  return m_scaling;
            }
            void  setScaling(const btVector3& scaling)
            {
                  m_scaling = scaling;
            }


};

#endif //STRIDING_MESHINTERFACE_H

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