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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 GU_EDGECACHE_H
#define GU_EDGECACHE_H
#include "foundation/PxMemory.h"
#include "CmPhysXCommon.h"
#include "PsHash.h"
namespace physx
{
namespace Gu
{
class EdgeCache
{
#define NUM_EDGES_IN_CACHE 64 //must be power of 2. 32 lines result in 10% extra work (due to cache misses), 64 lines in 6% extra work, 128 lines in 4%.
public:
EdgeCache()
{
PxMemZero(cacheLines, NUM_EDGES_IN_CACHE*sizeof(CacheLine));
}
PxU32 hash(PxU32 key) const
{
return (NUM_EDGES_IN_CACHE - 1) & Ps::hash(key); //Only a 16 bit hash would be needed here.
}
bool isInCache(PxU8 vertex0, PxU8 vertex1)
{
PX_ASSERT(vertex1 >= vertex0);
PxU16 key = PxU16((vertex0 << 8) | vertex1);
PxU32 h = hash(key);
CacheLine& cl = cacheLines[h];
if (cl.fullKey == key)
{
return true;
}
else //cache the line now as it's about to be processed
{
cl.fullKey = key;
return false;
}
}
private:
struct CacheLine
{
PxU16 fullKey;
};
CacheLine cacheLines[NUM_EDGES_IN_CACHE];
#undef NUM_EDGES_IN_CACHE
};
}
}
#endif
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