132 lines
4.0 KiB
C++
132 lines
4.0 KiB
C++
// 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) 2008-2023 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 PX_SORT_H
|
|
#define PX_SORT_H
|
|
|
|
/** \addtogroup foundation
|
|
@{
|
|
*/
|
|
|
|
#include "foundation/PxSortInternals.h"
|
|
#include "foundation/PxAlloca.h"
|
|
|
|
#define PX_SORT_PARANOIA PX_DEBUG
|
|
|
|
/**
|
|
\brief Sorts an array of objects in ascending order, assuming
|
|
that the predicate implements the < operator:
|
|
|
|
@see PxLess, PxGreater
|
|
*/
|
|
|
|
#if PX_VC
|
|
#pragma warning(push)
|
|
#pragma warning(disable : 4706) // disable the warning that we did an assignment within a conditional expression, as
|
|
// this was intentional.
|
|
#endif
|
|
|
|
#if !PX_DOXYGEN
|
|
namespace physx
|
|
{
|
|
#endif
|
|
template <class T, class Predicate, class PxAllocator>
|
|
void PxSort(T* elements, uint32_t count, const Predicate& compare, const PxAllocator& inAllocator,
|
|
const uint32_t initialStackSize = 32)
|
|
{
|
|
static const uint32_t SMALL_SORT_CUTOFF = 5; // must be >= 3 since we need 3 for median
|
|
|
|
PX_ALLOCA(stackMem, int32_t, initialStackSize);
|
|
PxStack<PxAllocator> stack(stackMem, initialStackSize, inAllocator);
|
|
|
|
int32_t first = 0, last = int32_t(count - 1);
|
|
if(last > first)
|
|
{
|
|
for(;;)
|
|
{
|
|
while(last > first)
|
|
{
|
|
PX_ASSERT(first >= 0 && last < int32_t(count));
|
|
if(uint32_t(last - first) < SMALL_SORT_CUTOFF)
|
|
{
|
|
PxSmallSort(elements, first, last, compare);
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
const int32_t partIndex = PxPartition(elements, first, last, compare);
|
|
|
|
// push smaller sublist to minimize stack usage
|
|
if((partIndex - first) < (last - partIndex))
|
|
{
|
|
stack.push(first, partIndex - 1);
|
|
first = partIndex + 1;
|
|
}
|
|
else
|
|
{
|
|
stack.push(partIndex + 1, last);
|
|
last = partIndex - 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(stack.empty())
|
|
break;
|
|
|
|
stack.pop(first, last);
|
|
}
|
|
}
|
|
#if PX_SORT_PARANOIA
|
|
for(uint32_t i = 1; i < count; i++)
|
|
PX_ASSERT(!compare(elements[i], elements[i - 1]));
|
|
#endif
|
|
}
|
|
|
|
template <class T, class Predicate>
|
|
void PxSort(T* elements, uint32_t count, const Predicate& compare)
|
|
{
|
|
PxSort(elements, count, compare, typename PxAllocatorTraits<T>::Type());
|
|
}
|
|
|
|
template <class T>
|
|
void PxSort(T* elements, uint32_t count)
|
|
{
|
|
PxSort(elements, count, PxLess<T>(), typename PxAllocatorTraits<T>::Type());
|
|
}
|
|
|
|
#if !PX_DOXYGEN
|
|
} // namespace physx
|
|
#endif
|
|
|
|
#if PX_VC
|
|
#pragma warning(pop)
|
|
#endif
|
|
/** @} */
|
|
#endif
|
|
|