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btAxisSweep3.h

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

//
// btAxisSweep3.h
//
// Copyright (c) 2006 Simon Hobbs
//
// 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 AXIS_SWEEP_3_H
#define AXIS_SWEEP_3_H

#include "LinearMath/btPoint3.h"
#include "LinearMath/btVector3.h"
#include "btOverlappingPairCache.h"
#include "btBroadphaseProxy.h"

/// btAxisSweep3 is an efficient implementation of the 3d axis sweep and prune broadphase.
/// It uses arrays rather then lists for storage of the 3 axis. Also it operates using integer coordinates instead of floats.
/// The testOverlap check is optimized to check the array index, rather then the actual AABB coordinates/pos
00030 class btAxisSweep3 : public btOverlappingPairCache
{

public:
      

      class Edge
      {
      public:
            unsigned short m_pos;               // low bit is min/max
            unsigned short m_handle;

            unsigned short IsMax() const {return m_pos & 1;}
      };

public:
      class Handle : public btBroadphaseProxy
      {
      public:
            
            // indexes into the edge arrays
            unsigned short m_minEdges[3], m_maxEdges[3];          // 6 * 2 = 12
            unsigned short m_handleId;
            unsigned short m_pad;
            
            //void* m_pOwner; this is now in btBroadphaseProxy.m_clientObject
      
            inline void SetNextFree(unsigned short next) {m_minEdges[0] = next;}
            inline unsigned short GetNextFree() const {return m_minEdges[0];}
      };          // 24 bytes + 24 for Edge structures = 44 bytes total per entry

      
private:
      btPoint3 m_worldAabbMin;                                    // overall system bounds
      btPoint3 m_worldAabbMax;                                    // overall system bounds

      btVector3 m_quantize;                                 // scaling factor for quantization

      int m_numHandles;                               // number of active handles
      int m_maxHandles;                               // max number of handles
      Handle* m_pHandles;                                   // handles pool
      unsigned short m_firstFreeHandle;         // free handles list

      Edge* m_pEdges[3];                                    // edge arrays for the 3 axes (each array has m_maxHandles * 2 + 2 sentinel entries)


      // allocation/deallocation
      unsigned short allocHandle();
      void freeHandle(unsigned short handle);
      

      bool testOverlap(int ignoreAxis,const Handle* pHandleA, const Handle* pHandleB);

      //Overlap* AddOverlap(unsigned short handleA, unsigned short handleB);
      //void RemoveOverlap(unsigned short handleA, unsigned short handleB);

      void quantize(unsigned short* out, const btPoint3& point, int isMax) const;

      void sortMinDown(int axis, unsigned short edge, bool updateOverlaps = true);
      void sortMinUp(int axis, unsigned short edge, bool updateOverlaps = true);
      void sortMaxDown(int axis, unsigned short edge, bool updateOverlaps = true);
      void sortMaxUp(int axis, unsigned short edge, bool updateOverlaps = true);

public:
      btAxisSweep3(const btPoint3& worldAabbMin,const btPoint3& worldAabbMax, int maxHandles = 16384);
      virtual     ~btAxisSweep3();

      virtual void      refreshOverlappingPairs()
      {
            //this is replace by sweep and prune
      }
      
      unsigned short addHandle(const btPoint3& aabbMin,const btPoint3& aabbMax, void* pOwner,short int collisionFilterGroup,short int collisionFilterMask);
      void removeHandle(unsigned short handle);
      void updateHandle(unsigned short handle, const btPoint3& aabbMin,const btPoint3& aabbMax);
      inline Handle* getHandle(unsigned short index) const {return m_pHandles + index;}


      //Broadphase Interface
      virtual btBroadphaseProxy*    createProxy(  const btVector3& min,  const btVector3& max,int shapeType,void* userPtr ,short int collisionFilterGroup,short int collisionFilterMask);
      virtual void      destroyProxy(btBroadphaseProxy* proxy);
      virtual void      setAabb(btBroadphaseProxy* proxy,const btVector3& aabbMin,const btVector3& aabbMax);

};

#endif //AXIS_SWEEP_3_H

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