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//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
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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