163 lines
4.0 KiB
C++
163 lines
4.0 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 PSFOUNDATION_PSHASH_H
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#define PSFOUNDATION_PSHASH_H
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#include "Ps.h"
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#include "PsBasicTemplates.h"
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#if PX_VC
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#pragma warning(push)
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#pragma warning(disable : 4302)
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#endif
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#if PX_LINUX
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#include "foundation/PxSimpleTypes.h"
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#endif
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/*!
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Central definition of hash functions
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*/
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namespace physx
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{
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namespace shdfnd
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{
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// Hash functions
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// Thomas Wang's 32 bit mix
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// http://www.cris.com/~Ttwang/tech/inthash.htm
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PX_FORCE_INLINE uint32_t hash(const uint32_t key)
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{
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uint32_t k = key;
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k += ~(k << 15);
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k ^= (k >> 10);
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k += (k << 3);
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k ^= (k >> 6);
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k += ~(k << 11);
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k ^= (k >> 16);
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return uint32_t(k);
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}
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PX_FORCE_INLINE uint32_t hash(const int32_t key)
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{
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return hash(uint32_t(key));
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}
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// Thomas Wang's 64 bit mix
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// http://www.cris.com/~Ttwang/tech/inthash.htm
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PX_FORCE_INLINE uint32_t hash(const uint64_t key)
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{
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uint64_t k = key;
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k += ~(k << 32);
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k ^= (k >> 22);
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k += ~(k << 13);
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k ^= (k >> 8);
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k += (k << 3);
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k ^= (k >> 15);
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k += ~(k << 27);
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k ^= (k >> 31);
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return uint32_t(UINT32_MAX & k);
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}
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#if PX_APPLE_FAMILY
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// hash for size_t, to make gcc happy
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PX_INLINE uint32_t hash(const size_t key)
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{
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#if PX_P64_FAMILY
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return hash(uint64_t(key));
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#else
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return hash(uint32_t(key));
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#endif
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}
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#endif
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// Hash function for pointers
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PX_INLINE uint32_t hash(const void* ptr)
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{
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#if PX_P64_FAMILY
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return hash(uint64_t(ptr));
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#else
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return hash(uint32_t(UINT32_MAX & size_t(ptr)));
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#endif
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}
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// Hash function for pairs
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template <typename F, typename S>
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PX_INLINE uint32_t hash(const Pair<F, S>& p)
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{
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uint32_t seed = 0x876543;
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uint32_t m = 1000007;
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return hash(p.second) ^ (m * (hash(p.first) ^ (m * seed)));
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}
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// hash object for hash map template parameter
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template <class Key>
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struct Hash
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{
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uint32_t operator()(const Key& k) const
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{
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return hash(k);
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}
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bool equal(const Key& k0, const Key& k1) const
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{
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return k0 == k1;
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}
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};
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// specialization for strings
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template <>
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struct Hash<const char*>
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{
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public:
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uint32_t operator()(const char* _string) const
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{
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// "DJB" string hash
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const uint8_t* string = reinterpret_cast<const uint8_t*>(_string);
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uint32_t h = 5381;
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for(const uint8_t* ptr = string; *ptr; ptr++)
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h = ((h << 5) + h) ^ uint32_t(*ptr);
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return h;
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}
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bool equal(const char* string0, const char* string1) const
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{
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return !strcmp(string0, string1);
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}
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};
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} // namespace shdfnd
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} // namespace physx
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#if PX_VC
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#pragma warning(pop)
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#endif
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#endif // #ifndef PSFOUNDATION_PSHASH_H
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