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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of NVIDIA CORPORATION nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2008-2018 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
#ifndef PX_PHYSICS_COMMON_PTR_TABLE
#define PX_PHYSICS_COMMON_PTR_TABLE
#include "PxPhysXCommonConfig.h"
#include "CmPhysXCommon.h"
namespace physx
{
class PxSerializationContext;
class PxDeserializationContext;
namespace Cm
{
class PtrTableStorageManager
{
// This will typically be backed by a MultiPool implementation with fallback to the user
// allocator. For MultiPool, when deallocating we want to know what the previously requested size was
// so we can release into the right pool
public:
// capacity is in bytes
virtual void** allocate(PxU32 capacity) = 0;
virtual void deallocate(void** addr, PxU32 originalCapacity) = 0;
// whether memory allocated at one capacity can (and should) be safely reused at a different capacity
// allows realloc-style reuse by clients.
virtual bool canReuse(PxU32 originalCapacity, PxU32 newCapacity) = 0;
protected:
virtual ~PtrTableStorageManager() {}
};
// specialized class to hold an array of pointers with extrinsic storage management,
// serialization-compatible with 3.3.1 PtrTable
//
// note that extrinsic storage implies you *must* clear the table before the destructor runs
//
// capacity is implicit:
// if the memory is not owned (i.e. came from deserialization) then the capacity is exactly mCount
// else if mCount==0, capacity is 0
// else the capacity is the power of 2 >= mCount
//
// one implication of this is that if we want to add or remove a pointer from unowned memory, we always realloc
struct PX_PHYSX_COMMON_API PtrTable
{
//= ATTENTION! =====================================================================================
// Changing the data layout of this class breaks the binary serialization format. See comments for
// PX_BINARY_SERIAL_VERSION. If a modification is required, please adjust the getBinaryMetaData
// function. If the modification is made on a custom branch, please change PX_BINARY_SERIAL_VERSION
// accordingly.
//==================================================================================================
PtrTable();
~PtrTable();
void add(void* ptr, PtrTableStorageManager& sm);
void replaceWithLast(PxU32 index, PtrTableStorageManager& sm);
void clear(PtrTableStorageManager& sm);
PxU32 find(const void* ptr) const;
PX_FORCE_INLINE PxU32 getCount() const { return mCount; }
PX_FORCE_INLINE void*const* getPtrs() const { return mCount == 1 ? &mSingle : mList; }
PX_FORCE_INLINE void** getPtrs() { return mCount == 1 ? &mSingle : mList; }
// SERIALIZATION
// 3.3.1 compatibility fixup: this implementation ALWAYS sets 'ownsMemory' if the size is 0 or 1
PtrTable(const PxEMPTY)
{
mOwnsMemory = mCount<2;
if(mCount == 0)
mList = NULL;
}
void exportExtraData(PxSerializationContext& stream);
void importExtraData(PxDeserializationContext& context);
static void getBinaryMetaData(physx::PxOutputStream& stream);
private:
void realloc(PxU32 oldCapacity, PxU32 newCapacity, PtrTableStorageManager& sm);
union
{
void* mSingle;
void** mList;
};
PxU16 mCount;
bool mOwnsMemory;
bool mBufferUsed; // dark magic in serialization requires this, otherwise redundant because it's logically equivalent to mCount == 1.
};
} // namespace Cm
#if !PX_P64_FAMILY
PX_COMPILE_TIME_ASSERT(sizeof(Cm::PtrTable)==8);
#endif
}
#endif
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