// This code contains NVIDIA Confidential Information and is disclosed to you
// under a form of NVIDIA software license agreement provided separately to you.
//
// Notice
// NVIDIA Corporation and its licensors retain all intellectual property and
// proprietary rights in and to this software and related documentation and
// any modifications thereto. Any use, reproduction, disclosure, or
// distribution of this software and related documentation without an express
// license agreement from NVIDIA Corporation is strictly prohibited.
//
// ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES
// NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
// THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT,
// MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.
//
// Information and code furnished is believed to be accurate and reliable.
// However, NVIDIA Corporation assumes no responsibility for the consequences of use of such
// information or for any infringement of patents or other rights of third parties that may
// result from its use. No license is granted by implication or otherwise under any patent
// or patent rights of NVIDIA Corporation. Details are subject to change without notice.
// This code supersedes and replaces all information previously supplied.
// NVIDIA Corporation products are not authorized for use as critical
// components in life support devices or systems without express written approval of
// NVIDIA Corporation.
//
// Copyright (c) 2008-2017 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 "PxcNpCacheStreamPair.h"
#include "PsUserAllocated.h"
#include "PxcNpMemBlockPool.h"

using namespace physx;

void PxcNpCacheStreamPair::reset()
{
	mBlock = NULL;
	mUsed = 0;
}

PxcNpCacheStreamPair::PxcNpCacheStreamPair(PxcNpMemBlockPool& blockPool):
  mBlockPool(blockPool), mBlock(NULL), mUsed(0)
{
}

// reserve can fail and return null. Read should never fail
PxU8* PxcNpCacheStreamPair::reserve(PxU32 size)
{
	size = (size+15)&~15;

	if(size>PxcNpMemBlock::SIZE)
	{
		return reinterpret_cast<PxU8*>(-1);
	}

	if(mBlock == NULL || mUsed + size > PxcNpMemBlock::SIZE)
	{
		mBlock = mBlockPool.acquireNpCacheBlock();
		mUsed = 0;
	}

	PxU8* ptr;
	if(mBlock == NULL)
		ptr = 0;
	else
	{
		ptr = mBlock->data+mUsed;
		mUsed += size;
	}

	return ptr;
}