139 lines
3.6 KiB
C++
139 lines
3.6 KiB
C++
//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of NVIDIA CORPORATION nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2008-2019 NVIDIA Corporation. All rights reserved.
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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
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#ifndef PXC_SCRATCHALLOCATOR_H
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#define PXC_SCRATCHALLOCATOR_H
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#include "foundation/PxAssert.h"
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#include "PxvConfig.h"
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#include "PsMutex.h"
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#include "PsArray.h"
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#include "PsAllocator.h"
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namespace physx
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{
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class PxcScratchAllocator
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{
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PX_NOCOPY(PxcScratchAllocator)
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public:
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PxcScratchAllocator() : mStack(PX_DEBUG_EXP("PxcScratchAllocator")), mStart(NULL), mSize(0)
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{
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mStack.reserve(64);
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mStack.pushBack(0);
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}
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void setBlock(void* addr, PxU32 size)
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{
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// if the stack is not empty then some scratch memory was not freed on the previous frame. That's
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// likely indicative of a problem, because when the scratch block is too small the memory will have
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// come from the heap
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PX_ASSERT(mStack.size()==1);
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mStack.popBack();
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mStart = reinterpret_cast<PxU8*>(addr);
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mSize = size;
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mStack.pushBack(mStart + size);
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}
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void* allocAll(PxU32& size)
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{
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Ps::Mutex::ScopedLock lock(mLock);
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PX_ASSERT(mStack.size()>0);
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size = PxU32(mStack.back()-mStart);
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if(size==0)
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return NULL;
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mStack.pushBack(mStart);
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return mStart;
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}
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void* alloc(PxU32 requestedSize, bool fallBackToHeap = false)
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{
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requestedSize = (requestedSize+15)&~15;
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Ps::Mutex::ScopedLock lock(mLock);
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PX_ASSERT(mStack.size()>=1);
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PxU8* top = mStack.back();
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if(top - mStart >= ptrdiff_t(requestedSize))
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{
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PxU8* addr = top - requestedSize;
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mStack.pushBack(addr);
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return addr;
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}
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if(!fallBackToHeap)
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return NULL;
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return PX_ALLOC(requestedSize, "Scratch Block Fallback");
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}
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void free(void* addr)
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{
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PX_ASSERT(addr!=NULL);
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if(!isScratchAddr(addr))
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{
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PX_FREE(addr);
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return;
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}
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Ps::Mutex::ScopedLock lock(mLock);
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PX_ASSERT(mStack.size()>1);
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PxU32 i=mStack.size()-1;
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while(mStack[i]<addr)
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i--;
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PX_ASSERT(mStack[i]==addr);
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mStack.remove(i);
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}
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bool isScratchAddr(void* addr) const
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{
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PxU8* a = reinterpret_cast<PxU8*>(addr);
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return a>= mStart && a<mStart+mSize;
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}
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private:
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Ps::Mutex mLock;
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Ps::Array<PxU8*> mStack;
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PxU8* mStart;
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PxU32 mSize;
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};
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}
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#endif
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