NpPtrTableStorageManager.h

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#ifndef NP_PTR_TABLE_STORAGE_MANAGER_H
#define NP_PTR_TABLE_STORAGE_MANAGER_H
 
#include "foundation/PxMutex.h"
#include "foundation/PxUserAllocated.h"
#include "foundation/PxBitUtils.h"
#include "CmPtrTable.h"
 
namespace physx
{
class NpPtrTableStorageManager : public Cm::PtrTableStorageManager, public PxUserAllocated
{
    PX_NOCOPY(NpPtrTableStorageManager)
 
public:
 
    NpPtrTableStorageManager() {}
    ~NpPtrTableStorageManager() {}
 
    // PtrTableStorageManager
    virtual void**  allocate(PxU32 capacity)
    {
        PX_ASSERT(PxIsPowerOfTwo(capacity));
 
        PxMutex::ScopedLock lock(mMutex);
 
        return capacity<=4  ?   reinterpret_cast<void**>(mPool4.construct())
             : capacity<=16 ?   reinterpret_cast<void**>(mPool16.construct())
             : capacity<=64 ?   reinterpret_cast<void**>(mPool64.construct())
             :                  reinterpret_cast<void**>(PX_ALLOC(capacity*sizeof(void*), "CmPtrTable pointer array"));
    }
 
    virtual void    deallocate(void** addr, PxU32 capacity)
    {
        PX_ASSERT(PxIsPowerOfTwo(capacity));
 
        PxMutex::ScopedLock lock(mMutex);
 
        if(capacity<=4)         mPool4.destroy(reinterpret_cast< PtrBlock<4>*>(addr));
        else if(capacity<=16)   mPool16.destroy(reinterpret_cast< PtrBlock<16>*>(addr));
        else if(capacity<=64)   mPool64.destroy(reinterpret_cast< PtrBlock<64>*>(addr));
        else                    PX_FREE(addr);
    }
 
    // originalCapacity is the only way we know which pool the alloc request belongs to,
    // so if those are no longer going to match, we need to realloc.
 
    virtual bool canReuse(PxU32 originalCapacity, PxU32 newCapacity)
    {
        PX_ASSERT(PxIsPowerOfTwo(originalCapacity));
        PX_ASSERT(PxIsPowerOfTwo(newCapacity));
 
        return poolId(originalCapacity) == poolId(newCapacity) && newCapacity<=64;
    }
    //~PtrTableStorageManager
 
private:
    PxMutex mMutex;
 
    int poolId(PxU32 size)
    {
        return size<=4  ? 0
             : size<=16 ? 1
             : size<=64 ? 2
             : 3;
    }
 
    template<int N> class PtrBlock { void* ptr[N]; };
 
    PxPool2<PtrBlock<4>, 4096 >     mPool4; 
    PxPool2<PtrBlock<16>, 4096 >    mPool16;
    PxPool2<PtrBlock<64>, 4096 >    mPool64;
};
 
}
#endif