67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
#ifndef UTIL_RANDOMNUMBERTABLE_H
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#define UTIL_RANDOMNUMNERTABLE_H
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/****************************************************************************
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Copyright (c) 2008, Radon Labs GmbH
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Copyright (c) 2011-2013,WebJet Business Division,CYOU
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http://www.genesis-3d.com.cn
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "core/types.h"
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//------------------------------------------------------------------------------
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namespace Util
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{
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class RandomNumberTable
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{
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public:
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/// return a pseudo-random number between 0 and 1
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static float Rand(IndexT key);
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/// return a pseudo random number between min and max
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static float Rand(IndexT key, float minVal, float maxVal);
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private:
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static const SizeT tableSize = 2048;
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static const float randTable[tableSize];
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};
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//------------------------------------------------------------------------------
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/**
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*/
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inline float
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RandomNumberTable::Rand(IndexT key)
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{
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return randTable[key % tableSize];
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}
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//------------------------------------------------------------------------------
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/**
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*/
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inline float
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RandomNumberTable::Rand(IndexT key, float minVal, float maxVal)
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{
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return minVal + (randTable[key % tableSize] * (maxVal - minVal));
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}
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} // namespace Util
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//------------------------------------------------------------------------------
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#endif
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