55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
/*******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011, 2012.
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This file is part of LibMaxsi.
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LibMaxsi is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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LibMaxsi 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
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details.
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You should have received a copy of the GNU Lesser General Public License
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along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
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random.cpp
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Provides access to random numbers using various algorithms.
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*******************************************************************************/
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#include <libmaxsi/platform.h>
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namespace Maxsi
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{
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namespace Random
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{
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#if 1
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unsigned int m_w = 1337;
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unsigned int m_z = 37;
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unsigned int RandomUnsignedInt()
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{
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m_z = 36969 * (m_z & 65535) + (m_z >> 16);
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m_w = 18000 * (m_w & 65535) + (m_w >> 16);
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return (m_z << 16) + m_w; /* 32-bit result */
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}
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extern "C" int rand()
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{
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return RandomUnsignedInt() % 32768;
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}
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#else
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unsigned random_seed = 1337;
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extern "C" int rand()
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{
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random_seed = random_seed + 37 * 1103515245 + 12345;
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return random_seed >> 16;
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}
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#endif
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}
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}
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