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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.
#include "foundation/PxAssert.h"
#include "foundation/PxMemory.h"
#include "CmPtrTable.h"
#include "CmUtils.h"
#include "PxMetaData.h"
#include "PsBitUtils.h"
using namespace physx;
using namespace Cm;
PtrTable::PtrTable()
: mList(NULL)
, mCount(0)
, mOwnsMemory(true)
, mBufferUsed(false)
{
}
PtrTable::~PtrTable()
{
PX_ASSERT(mOwnsMemory);
PX_ASSERT(mCount == 0);
PX_ASSERT(mList == NULL);
}
void PtrTable::clear(PtrTableStorageManager& sm)
{
if(mOwnsMemory && mCount>1)
{
PxU32 implicitCapacity = Ps::nextPowerOfTwo(PxU32(mCount)-1);
sm.deallocate(mList, sizeof(void*)*implicitCapacity);
}
mList = NULL;
mOwnsMemory = true;
mCount = 0;
}
PxU32 PtrTable::find(const void* ptr) const
{
const PxU32 nbPtrs = mCount;
void*const * PX_RESTRICT ptrs = getPtrs();
for(PxU32 i=0; i<nbPtrs; i++)
{
if(ptrs[i] == ptr)
return i;
}
return 0xffffffff;
}
void PtrTable::exportExtraData(PxSerializationContext& stream)
{
if(mCount>1)
{
stream.alignData(PX_SERIAL_ALIGN);
stream.writeData(mList, sizeof(void*)*mCount);
}
}
void PtrTable::importExtraData(PxDeserializationContext& context)
{
if(mCount>1)
mList = context.readExtraData<void*, PX_SERIAL_ALIGN>(mCount);
}
void PtrTable::realloc(PxU32 oldCapacity, PxU32 newCapacity, PtrTableStorageManager& sm)
{
PX_ASSERT((mOwnsMemory && oldCapacity) || (!mOwnsMemory && oldCapacity == 0));
PX_ASSERT(newCapacity);
if(mOwnsMemory && sm.canReuse(oldCapacity, newCapacity))
return;
void** newMem = sm.allocate(newCapacity * sizeof(void*));
PxMemCopy(newMem, mList, mCount * sizeof(void*));
if(mOwnsMemory)
sm.deallocate(mList, oldCapacity*sizeof(void*));
mList = newMem;
mOwnsMemory = true;
}
void PtrTable::add(void* ptr, PtrTableStorageManager& sm)
{
if(mCount == 0) // 0 -> 1, easy case
{
PX_ASSERT(mOwnsMemory);
PX_ASSERT(mList == NULL);
PX_ASSERT(!mBufferUsed);
mSingle = ptr;
mCount = 1;
mBufferUsed = true;
return;
}
if(mCount == 1) // 1 -> 2, easy case
{
PX_ASSERT(mOwnsMemory);
PX_ASSERT(mBufferUsed);
void* single = mSingle;
mList = sm.allocate(2*sizeof(void*));
mList[0] = single;
mBufferUsed = false;
mOwnsMemory = true;
}
else
{
PX_ASSERT(!mBufferUsed);
if(!mOwnsMemory) // don't own the memory, must always alloc
realloc(0, Ps::nextPowerOfTwo(mCount), sm); // we're guaranteed nextPowerOfTwo(x) > x
else if(Ps::isPowerOfTwo(mCount)) // count is at implicit capacity, so realloc
realloc(mCount, PxU32(mCount)*2, sm); // ... to next higher power of 2
PX_ASSERT(mOwnsMemory);
}
mList[mCount++] = ptr;
}
void PtrTable::replaceWithLast(PxU32 index, PtrTableStorageManager& sm)
{
PX_ASSERT(mCount!=0);
if(mCount == 1) // 1 -> 0 easy case
{
PX_ASSERT(mOwnsMemory);
PX_ASSERT(mBufferUsed);
mList = NULL;
mCount = 0;
mBufferUsed = false;
}
else if(mCount == 2) // 2 -> 1 easy case
{
PX_ASSERT(!mBufferUsed);
void* ptr = mList[1-index];
if(mOwnsMemory)
sm.deallocate(mList, 2*sizeof(void*));
mSingle = ptr;
mCount = 1;
mBufferUsed = true;
mOwnsMemory = true;
}
else
{
PX_ASSERT(!mBufferUsed);
mList[index] = mList[--mCount]; // remove before adjusting memory
if(!mOwnsMemory) // don't own the memory, must alloc
realloc(0, Ps::nextPowerOfTwo(PxU32(mCount)-1), sm); // if currently a power of 2, don't jump to the next one
else if(Ps::isPowerOfTwo(mCount)) // own the memory, and implicit capacity requires that we downsize
realloc(PxU32(mCount)*2, PxU32(mCount), sm); // ... from the next power of 2, which was the old implicit capacity
PX_ASSERT(mOwnsMemory);
}
}
void Cm::PtrTable::getBinaryMetaData(PxOutputStream& stream)
{
PX_DEF_BIN_METADATA_CLASS(stream, PtrTable)
PX_DEF_BIN_METADATA_ITEM(stream, PtrTable, void, mSingle, PxMetaDataFlag::ePTR) // PT: this is actually a union, beware
PX_DEF_BIN_METADATA_ITEM(stream, PtrTable, PxU16, mCount, 0)
PX_DEF_BIN_METADATA_ITEM(stream, PtrTable, bool, mOwnsMemory, 0)
PX_DEF_BIN_METADATA_ITEM(stream, PtrTable, bool, mBufferUsed, 0)
//------ Extra-data ------
// mList
PX_DEF_BIN_METADATA_EXTRA_ITEMS(stream, PtrTable, void, mBufferUsed, mCount, PxMetaDataFlag::eCONTROL_FLIP|PxMetaDataFlag::ePTR, PX_SERIAL_ALIGN)
}
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