Panda3D
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00001 // Filename: mersenne.h 00002 // Created by: darren (18Jul02) 00003 // 00004 //////////////////////////////////////////////////////////////////// 00005 // 00006 // PANDA 3D SOFTWARE 00007 // Copyright (c) Carnegie Mellon University. All rights reserved. 00008 // 00009 // All use of this software is subject to the terms of the revised BSD 00010 // license. You should have received a copy of this license along 00011 // with this source code in a file named "LICENSE." 00012 // 00013 //////////////////////////////////////////////////////////////////// 00014 00015 #ifndef MERSENNE_H 00016 #define MERSENNE_H 00017 00018 /* 00019 A C-program for MT19937, with initialization improved 2002/1/26. 00020 Coded by Takuji Nishimura and Makoto Matsumoto. 00021 00022 Before using, initialize the state by using init_genrand(seed) 00023 or init_by_array(init_key, key_length). 00024 00025 Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura, 00026 All rights reserved. 00027 00028 Redistribution and use in source and binary forms, with or without 00029 modification, are permitted provided that the following conditions 00030 are met: 00031 00032 1. Redistributions of source code must retain the above copyright 00033 notice, this list of conditions and the following disclaimer. 00034 00035 2. Redistributions in binary form must reproduce the above copyright 00036 notice, this list of conditions and the following disclaimer in the 00037 documentation and/or other materials provided with the distribution. 00038 00039 3. The names of its contributors may not be used to endorse or promote 00040 products derived from this software without specific prior written 00041 permission. 00042 00043 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00044 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00045 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00046 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 00047 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00048 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00049 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00050 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00051 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00052 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00053 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00054 00055 00056 Any feedback is very welcome. 00057 http://www.math.keio.ac.jp/matumoto/emt.html 00058 email: matumoto@math.keio.ac.jp 00059 */ 00060 00061 #include "pandabase.h" 00062 00063 class EXPCL_PANDA_MATHUTIL Mersenne { 00064 PUBLISHED: 00065 Mersenne(unsigned long seed); 00066 unsigned long get_uint31(); 00067 00068 enum { 00069 max_value = 0x7fffffff 00070 }; 00071 00072 private: 00073 enum { 00074 // Period parameters 00075 N = 624, 00076 M = 397, 00077 MATRIX_A = 0x9908b0dfUL, // constant vector a 00078 UPPER_MASK = 0x80000000UL, // most significant w-r bits 00079 LOWER_MASK = 0x7fffffffUL, // least significant r bits 00080 }; 00081 00082 unsigned long mt[N]; // the array for the state vector 00083 unsigned int mti; // mti==N+1 means mt[N] is not initialized 00084 }; 00085 00086 #endif