82 lines
3.5 KiB
C++
82 lines
3.5 KiB
C++
/*
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* ICE / OPCODE - Optimized Collision Detection
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* http://www.codercorner.com/Opcode.htm
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*
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* Copyright (c) 2001-2008 Pierre Terdiman, pierre@codercorner.com
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This software is provided 'as-is', without any express or implied warranty.
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In no event will the authors be held liable for any damages arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it freely,
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subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Contains source code from the article "Radix Sort Revisited".
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* \file IceRevisitedRadix.h
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* \author Pierre Terdiman
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* \date April, 4, 2000
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*/
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// Include Guard
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#ifndef __ICERADIXSORT_H__
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#define __ICERADIXSORT_H__
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//! Allocate histograms & offsets locally
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#define RADIX_LOCAL_RAM
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enum RadixHint
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{
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RADIX_SIGNED, //!< Input values are signed
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RADIX_UNSIGNED, //!< Input values are unsigned
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RADIX_FORCE_DWORD = 0x7fffffff
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};
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class ICECORE_API RadixSort
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{
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public:
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// Constructor/Destructor
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RadixSort();
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~RadixSort();
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// Sorting methods
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RadixSort& Sort(const udword* input, udword nb, RadixHint hint=RADIX_SIGNED);
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RadixSort& Sort(const float* input, udword nb);
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//! Access to results. mRanks is a list of indices in sorted order, i.e. in the order you may further process your data
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inline_ const udword* GetRanks() const { return mRanks; }
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//! mIndices2 gets trashed on calling the sort routine, but otherwise you can recycle it the way you want.
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inline_ udword* GetRecyclable() const { return mRanks2; }
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// Stats
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udword GetUsedRam() const;
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//! Returns the total number of calls to the radix sorter.
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inline_ udword GetNbTotalCalls() const { return mTotalCalls; }
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//! Returns the number of eraly exits due to temporal coherence.
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inline_ udword GetNbHits() const { return mNbHits; }
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private:
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#ifndef RADIX_LOCAL_RAM
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udword* mHistogram; //!< Counters for each byte
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udword* mOffset; //!< Offsets (nearly a cumulative distribution function)
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#endif
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udword mCurrentSize; //!< Current size of the indices list
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udword* mRanks; //!< Two lists, swapped each pass
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udword* mRanks2;
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// Stats
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udword mTotalCalls; //!< Total number of calls to the sort routine
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udword mNbHits; //!< Number of early exits due to coherence
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// Internal methods
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void CheckResize(udword nb);
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bool Resize(udword nb);
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};
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#endif // __ICERADIXSORT_H__
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