Space-Project/dependencies/physx-4.1/source/lowlevel/common/include/utils/PxcScratchAllocator.h
2021-01-16 17:11:39 +01:00

139 lines
3.6 KiB
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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
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// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
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// * 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.
//
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// Copyright (c) 2008-2019 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 PXC_SCRATCHALLOCATOR_H
#define PXC_SCRATCHALLOCATOR_H
#include "foundation/PxAssert.h"
#include "PxvConfig.h"
#include "PsMutex.h"
#include "PsArray.h"
#include "PsAllocator.h"
namespace physx
{
class PxcScratchAllocator
{
PX_NOCOPY(PxcScratchAllocator)
public:
PxcScratchAllocator() : mStack(PX_DEBUG_EXP("PxcScratchAllocator")), mStart(NULL), mSize(0)
{
mStack.reserve(64);
mStack.pushBack(0);
}
void setBlock(void* addr, PxU32 size)
{
// if the stack is not empty then some scratch memory was not freed on the previous frame. That's
// likely indicative of a problem, because when the scratch block is too small the memory will have
// come from the heap
PX_ASSERT(mStack.size()==1);
mStack.popBack();
mStart = reinterpret_cast<PxU8*>(addr);
mSize = size;
mStack.pushBack(mStart + size);
}
void* allocAll(PxU32& size)
{
Ps::Mutex::ScopedLock lock(mLock);
PX_ASSERT(mStack.size()>0);
size = PxU32(mStack.back()-mStart);
if(size==0)
return NULL;
mStack.pushBack(mStart);
return mStart;
}
void* alloc(PxU32 requestedSize, bool fallBackToHeap = false)
{
requestedSize = (requestedSize+15)&~15;
Ps::Mutex::ScopedLock lock(mLock);
PX_ASSERT(mStack.size()>=1);
PxU8* top = mStack.back();
if(top - mStart >= ptrdiff_t(requestedSize))
{
PxU8* addr = top - requestedSize;
mStack.pushBack(addr);
return addr;
}
if(!fallBackToHeap)
return NULL;
return PX_ALLOC(requestedSize, "Scratch Block Fallback");
}
void free(void* addr)
{
PX_ASSERT(addr!=NULL);
if(!isScratchAddr(addr))
{
PX_FREE(addr);
return;
}
Ps::Mutex::ScopedLock lock(mLock);
PX_ASSERT(mStack.size()>1);
PxU32 i=mStack.size()-1;
while(mStack[i]<addr)
i--;
PX_ASSERT(mStack[i]==addr);
mStack.remove(i);
}
bool isScratchAddr(void* addr) const
{
PxU8* a = reinterpret_cast<PxU8*>(addr);
return a>= mStart && a<mStart+mSize;
}
private:
Ps::Mutex mLock;
Ps::Array<PxU8*> mStack;
PxU8* mStart;
PxU32 mSize;
};
}
#endif