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#ifndef B3_RESIZABLE_POOL_H
#define B3_RESIZABLE_POOL_H
#include "Bullet3Common/b3AlignedObjectArray.h"
enum
{
B3_POOL_HANDLE_TERMINAL_FREE = -1,
B3_POOL_HANDLE_TERMINAL_USED = -2
};
template <typename U>
struct b3PoolBodyHandle : public U
{
B3_DECLARE_ALIGNED_ALLOCATOR();
int m_nextFreeHandle;
void setNextFree(int next)
{
m_nextFreeHandle = next;
}
int getNextFree() const
{
return m_nextFreeHandle;
}
};
template <typename T>
class b3ResizablePool
{
protected:
b3AlignedObjectArray<T> m_bodyHandles;
int m_numUsedHandles; // number of active handles
int m_firstFreeHandle; // free handles list
T* getHandleInternal(int handle)
{
return &m_bodyHandles[handle];
}
const T* getHandleInternal(int handle) const
{
return &m_bodyHandles[handle];
}
public:
b3ResizablePool()
{
initHandles();
}
virtual ~b3ResizablePool()
{
exitHandles();
}
///handle management
int getNumHandles() const
{
return m_bodyHandles.size();
}
void getUsedHandles(b3AlignedObjectArray<int>& usedHandles) const
{
for (int i = 0; i < m_bodyHandles.size(); i++)
{
if (m_bodyHandles[i].getNextFree() == B3_POOL_HANDLE_TERMINAL_USED)
{
usedHandles.push_back(i);
}
}
}
T* getHandle(int handle)
{
b3Assert(handle >= 0);
b3Assert(handle < m_bodyHandles.size());
if ((handle < 0) || (handle >= m_bodyHandles.size()))
{
return 0;
}
if (m_bodyHandles[handle].getNextFree() == B3_POOL_HANDLE_TERMINAL_USED)
{
return &m_bodyHandles[handle];
}
return 0;
}
const T* getHandle(int handle) const
{
b3Assert(handle >= 0);
b3Assert(handle < m_bodyHandles.size());
if ((handle < 0) || (handle >= m_bodyHandles.size()))
{
return 0;
}
if (m_bodyHandles[handle].getNextFree() == B3_POOL_HANDLE_TERMINAL_USED)
{
return &m_bodyHandles[handle];
}
return 0;
}
void increaseHandleCapacity(int extraCapacity)
{
int curCapacity = m_bodyHandles.size();
//b3Assert(curCapacity == m_numUsedHandles);
int newCapacity = curCapacity + extraCapacity;
m_bodyHandles.resize(newCapacity);
{
for (int i = curCapacity; i < newCapacity; i++)
m_bodyHandles[i].setNextFree(i + 1);
m_bodyHandles[newCapacity - 1].setNextFree(-1);
}
m_firstFreeHandle = curCapacity;
}
void initHandles()
{
m_numUsedHandles = 0;
m_firstFreeHandle = -1;
increaseHandleCapacity(1);
}
void exitHandles()
{
m_bodyHandles.resize(0);
m_firstFreeHandle = -1;
m_numUsedHandles = 0;
}
int allocHandle()
{
b3Assert(m_firstFreeHandle >= 0);
int handle = m_firstFreeHandle;
m_firstFreeHandle = getHandleInternal(handle)->getNextFree();
m_numUsedHandles++;
if (m_firstFreeHandle < 0)
{
//int curCapacity = m_bodyHandles.size();
int additionalCapacity = m_bodyHandles.size();
increaseHandleCapacity(additionalCapacity);
getHandleInternal(handle)->setNextFree(m_firstFreeHandle);
}
getHandleInternal(handle)->setNextFree(B3_POOL_HANDLE_TERMINAL_USED);
getHandleInternal(handle)->clear();
return handle;
}
void freeHandle(int handle)
{
b3Assert(handle >= 0);
if (m_bodyHandles[handle].getNextFree() == B3_POOL_HANDLE_TERMINAL_USED)
{
getHandleInternal(handle)->clear();
getHandleInternal(handle)->setNextFree(m_firstFreeHandle);
m_firstFreeHandle = handle;
m_numUsedHandles--;
}
}
};
///end handle management
#endif //B3_RESIZABLE_POOL_H
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