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https://github.com/juce-framework/JUCE.git
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138 lines
3.7 KiB
C++
138 lines
3.7 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library - "Jules' Utility Class Extensions"
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Copyright 2004-11 by Raw Material Software Ltd.
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------------------------------------------------------------------------------
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JUCE can be redistributed and/or modified under the terms of the GNU General
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Public License (Version 2), as published by the Free Software Foundation.
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A copy of the license is included in the JUCE distribution, or can be found
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online at www.gnu.org/licenses.
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.rawmaterialsoftware.com/juce for more information.
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==============================================================================
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*/
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#include "../core/juce_StandardHeader.h"
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BEGIN_JUCE_NAMESPACE
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#include "juce_Random.h"
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#include "../core/juce_Time.h"
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//==============================================================================
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Random::Random (const int64 seedValue) throw()
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: seed (seedValue)
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{
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}
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Random::~Random() throw()
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{
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}
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void Random::setSeed (const int64 newSeed) throw()
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{
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seed = newSeed;
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}
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void Random::combineSeed (const int64 seedValue) throw()
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{
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seed ^= nextInt64() ^ seedValue;
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}
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void Random::setSeedRandomly()
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{
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combineSeed ((int64) (pointer_sized_int) this);
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combineSeed (Time::getMillisecondCounter());
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combineSeed (Time::getHighResolutionTicks());
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combineSeed (Time::getHighResolutionTicksPerSecond());
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combineSeed (Time::currentTimeMillis());
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}
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//==============================================================================
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int Random::nextInt() throw()
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{
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seed = (seed * literal64bit (0x5deece66d) + 11) & literal64bit (0xffffffffffff);
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return (int) (seed >> 16);
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}
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int Random::nextInt (const int maxValue) throw()
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{
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jassert (maxValue > 0);
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return (nextInt() & 0x7fffffff) % maxValue;
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}
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int64 Random::nextInt64() throw()
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{
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return (((int64) nextInt()) << 32) | (int64) (uint64) (uint32) nextInt();
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}
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bool Random::nextBool() throw()
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{
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return (nextInt() & 0x80000000) != 0;
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}
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float Random::nextFloat() throw()
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{
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return static_cast <uint32> (nextInt()) / (float) 0xffffffff;
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}
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double Random::nextDouble() throw()
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{
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return static_cast <uint32> (nextInt()) / (double) 0xffffffff;
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}
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const BigInteger Random::nextLargeNumber (const BigInteger& maximumValue)
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{
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BigInteger n;
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do
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{
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fillBitsRandomly (n, 0, maximumValue.getHighestBit() + 1);
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}
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while (n >= maximumValue);
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return n;
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}
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void Random::fillBitsRandomly (BigInteger& arrayToChange, int startBit, int numBits)
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{
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arrayToChange.setBit (startBit + numBits - 1, true); // to force the array to pre-allocate space
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while ((startBit & 31) != 0 && numBits > 0)
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{
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arrayToChange.setBit (startBit++, nextBool());
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--numBits;
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}
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while (numBits >= 32)
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{
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arrayToChange.setBitRangeAsInt (startBit, 32, (unsigned int) nextInt());
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startBit += 32;
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numBits -= 32;
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}
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while (--numBits >= 0)
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arrayToChange.setBit (startBit + numBits, nextBool());
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}
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//==============================================================================
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Random& Random::getSystemRandom() throw()
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{
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static Random sysRand (1);
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return sysRand;
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}
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END_JUCE_NAMESPACE
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