// Emacs style mode select -*- C++ -*- //----------------------------------------------------------------------------- // // $Id: m_random.c 272 2006-01-08 17:52:16Z fraggle $ // // Copyright(C) 1993-1996 Id Software, Inc. // Copyright(C) 2005 Simon Howard // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA // 02111-1307, USA. // // $Log$ // Revision 1.3 2006/01/08 17:52:16 fraggle // Seed the M_Random random number generator from the system time to give // it some more randomness. // // Revision 1.2 2005/07/23 16:44:56 fraggle // Update copyright to GNU GPL // // Revision 1.1.1.1 2005/07/23 16:20:27 fraggle // Initial import // // // DESCRIPTION: // Random number LUT. // //----------------------------------------------------------------------------- static const char rcsid[] = "$Id: m_random.c 272 2006-01-08 17:52:16Z fraggle $"; #include #include "m_random.h" // // M_Random // Returns a 0-255 number // unsigned char rndtable[256] = { 0, 8, 109, 220, 222, 241, 149, 107, 75, 248, 254, 140, 16, 66 , 74, 21, 211, 47, 80, 242, 154, 27, 205, 128, 161, 89, 77, 36 , 95, 110, 85, 48, 212, 140, 211, 249, 22, 79, 200, 50, 28, 188 , 52, 140, 202, 120, 68, 145, 62, 70, 184, 190, 91, 197, 152, 224 , 149, 104, 25, 178, 252, 182, 202, 182, 141, 197, 4, 81, 181, 242 , 145, 42, 39, 227, 156, 198, 225, 193, 219, 93, 122, 175, 249, 0 , 175, 143, 70, 239, 46, 246, 163, 53, 163, 109, 168, 135, 2, 235 , 25, 92, 20, 145, 138, 77, 69, 166, 78, 176, 173, 212, 166, 113 , 94, 161, 41, 50, 239, 49, 111, 164, 70, 60, 2, 37, 171, 75 , 136, 156, 11, 56, 42, 146, 138, 229, 73, 146, 77, 61, 98, 196 , 135, 106, 63, 197, 195, 86, 96, 203, 113, 101, 170, 247, 181, 113 , 80, 250, 108, 7, 255, 237, 129, 226, 79, 107, 112, 166, 103, 241 , 24, 223, 239, 120, 198, 58, 60, 82, 128, 3, 184, 66, 143, 224 , 145, 224, 81, 206, 163, 45, 63, 90, 168, 114, 59, 33, 159, 95 , 28, 139, 123, 98, 125, 196, 15, 70, 194, 253, 54, 14, 109, 226 , 71, 17, 161, 93, 186, 87, 244, 138, 20, 52, 123, 251, 26, 36 , 17, 46, 52, 231, 232, 76, 31, 221, 84, 37, 216, 165, 212, 106 , 197, 242, 98, 43, 39, 175, 254, 145, 190, 84, 118, 222, 187, 136 , 120, 163, 236, 249 }; int rndindex = 0; int prndindex = 0; // Which one is deterministic? int P_Random (void) { prndindex = (prndindex+1)&0xff; return rndtable[prndindex]; } int M_Random (void) { rndindex = (rndindex+1)&0xff; return rndtable[rndindex]; } void M_ClearRandom (void) { prndindex = 0; // Seed the M_Random counter from the system time rndindex = time(NULL) & 0xff; }