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David Rose 2003-01-20 22:27:01 +00:00
parent 14a4a0ef10
commit 1e1aa28735
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192
direct/src/showbase/mersenne.cxx
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@ -1,96 +1,96 @@
/* /*
A C-program for MT19937, with initialization improved 2002/1/26. A C-program for MT19937, with initialization improved 2002/1/26.
Coded by Takuji Nishimura and Makoto Matsumoto. Coded by Takuji Nishimura and Makoto Matsumoto.
Before using, initialize the state by using init_genrand(seed) Before using, initialize the state by using init_genrand(seed)
or init_by_array(init_key, key_length). or init_by_array(init_key, key_length).
Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura, Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
All rights reserved. All rights reserved.
Redistribution and use in source and binary forms, with or without Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions modification, are permitted provided that the following conditions
are met: are met:
1. Redistributions of source code must retain the above copyright 1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer. notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright 2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution. documentation and/or other materials provided with the distribution.
3. The names of its contributors may not be used to endorse or promote 3. The names of its contributors may not be used to endorse or promote
products derived from this software without specific prior written products derived from this software without specific prior written
permission. permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Any feedback is very welcome. Any feedback is very welcome.
http://www.math.keio.ac.jp/matumoto/emt.html http://www.math.keio.ac.jp/matumoto/emt.html
email: matumoto@math.keio.ac.jp email: matumoto@math.keio.ac.jp
*/ */
#include "mersenne.h" #include "mersenne.h"
#include <stdio.h> #include <stdio.h>
/* initializes mt[N] with a seed */ /* initializes mt[N] with a seed */
Mersenne:: Mersenne::
Mersenne(unsigned long seed) { Mersenne(unsigned long seed) {
mt[0]= seed & 0xffffffffUL; mt[0]= seed & 0xffffffffUL;
for (mti=1; mti<N; mti++) { for (mti=1; mti<N; mti++) {
mt[mti] = mt[mti] =
(1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti); (1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti);
/* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */ /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
/* In the previous versions, MSBs of the seed affect */ /* In the previous versions, MSBs of the seed affect */
/* only MSBs of the array mt[]. */ /* only MSBs of the array mt[]. */
/* 2002/01/09 modified by Makoto Matsumoto */ /* 2002/01/09 modified by Makoto Matsumoto */
mt[mti] &= 0xffffffffUL; mt[mti] &= 0xffffffffUL;
/* for >32 bit machines */ /* for >32 bit machines */
} }
} }
/* generates a random number on [0,0x7fffffff]-interval */ /* generates a random number on [0,0x7fffffff]-interval */
unsigned long Mersenne:: unsigned long Mersenne::
get_uint31() { get_uint31() {
unsigned long y; unsigned long y;
static unsigned long mag01[2]={0x0UL, MATRIX_A}; static unsigned long mag01[2]={0x0UL, MATRIX_A};
/* mag01[x] = x * MATRIX_A for x=0,1 */ /* mag01[x] = x * MATRIX_A for x=0,1 */
if (mti >= N) { /* generate N words at one time */ if (mti >= N) { /* generate N words at one time */
int kk; int kk;
for (kk=0;kk<N-M;kk++) { for (kk=0;kk<N-M;kk++) {
y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK); y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL]; mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL];
} }
for (;kk<N-1;kk++) { for (;kk<N-1;kk++) {
y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK); y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1UL]; mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
} }
y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK); y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL]; mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL];
mti = 0; mti = 0;
} }
y = mt[mti++]; y = mt[mti++];
/* Tempering */ /* Tempering */
y ^= (y >> 11); y ^= (y >> 11);
y ^= (y << 7) & 0x9d2c5680UL; y ^= (y << 7) & 0x9d2c5680UL;
y ^= (y << 15) & 0xefc60000UL; y ^= (y << 15) & 0xefc60000UL;
y ^= (y >> 18); y ^= (y >> 18);
return y >> 1; return y >> 1;
} }

172
direct/src/showbase/mersenne.h
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@ -1,86 +1,86 @@
// Filename: mersenne.h // Filename: mersenne.h
// Created by: darren (18Jul02) // Created by: darren (18Jul02)
// //
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// //
// PANDA 3D SOFTWARE // PANDA 3D SOFTWARE
// Copyright (c) 2001, Disney Enterprises, Inc. All rights reserved // Copyright (c) 2001, Disney Enterprises, Inc. All rights reserved
// //
// All use of this software is subject to the terms of the Panda 3d // All use of this software is subject to the terms of the Panda 3d
// Software license. You should have received a copy of this license // Software license. You should have received a copy of this license
// along with this source code; you will also find a current copy of // along with this source code; you will also find a current copy of
// the license at http://www.panda3d.org/license.txt . // the license at http://www.panda3d.org/license.txt .
// //
// To contact the maintainers of this program write to // To contact the maintainers of this program write to
// panda3d@yahoogroups.com . // panda3d@yahoogroups.com .
// //
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
#ifndef MERSENNE_H #ifndef MERSENNE_H
#define MERSENNE_H #define MERSENNE_H
/* /*
A C-program for MT19937, with initialization improved 2002/1/26. A C-program for MT19937, with initialization improved 2002/1/26.
Coded by Takuji Nishimura and Makoto Matsumoto. Coded by Takuji Nishimura and Makoto Matsumoto.
Before using, initialize the state by using init_genrand(seed) Before using, initialize the state by using init_genrand(seed)
or init_by_array(init_key, key_length). or init_by_array(init_key, key_length).
Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura, Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
All rights reserved. All rights reserved.
Redistribution and use in source and binary forms, with or without Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions modification, are permitted provided that the following conditions
are met: are met:
1. Redistributions of source code must retain the above copyright 1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer. notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright 2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution. documentation and/or other materials provided with the distribution.
3. The names of its contributors may not be used to endorse or promote 3. The names of its contributors may not be used to endorse or promote
products derived from this software without specific prior written products derived from this software without specific prior written
permission. permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Any feedback is very welcome. Any feedback is very welcome.
http://www.math.keio.ac.jp/matumoto/emt.html http://www.math.keio.ac.jp/matumoto/emt.html
email: matumoto@math.keio.ac.jp email: matumoto@math.keio.ac.jp
*/ */
#include <directbase.h> #include <directbase.h>
class EXPCL_DIRECT Mersenne { class EXPCL_DIRECT Mersenne {
PUBLISHED: PUBLISHED:
Mersenne(unsigned long seed); Mersenne(unsigned long seed);
unsigned long get_uint31(); unsigned long get_uint31();
private: private:
enum { enum {
// Period parameters // Period parameters
N = 624, N = 624,
M = 397, M = 397,
MATRIX_A = 0x9908b0dfUL, // constant vector a MATRIX_A = 0x9908b0dfUL, // constant vector a
UPPER_MASK = 0x80000000UL, // most significant w-r bits UPPER_MASK = 0x80000000UL, // most significant w-r bits
LOWER_MASK = 0x7fffffffUL, // least significant r bits LOWER_MASK = 0x7fffffffUL, // least significant r bits
}; };
unsigned long mt[N]; // the array for the state vector unsigned long mt[N]; // the array for the state vector
int mti; // mti==N+1 means mt[N] is not initialized int mti; // mti==N+1 means mt[N] is not initialized
}; };
#endif #endif