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  1. // Emacs style mode select   -*- C++ -*-
  2. //-----------------------------------------------------------------------------
  3. //
  4. // $Id:$
  5. //
  6. // Copyright (C) 1993-1996 by id Software, Inc.
  7. //
  8. // This source is available for distribution and/or modification
  9. // only under the terms of the DOOM Source Code License as
  10. // published by id Software. All rights reserved.
  11. //
  12. // The source is distributed in the hope that it will be useful,
  13. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. // FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
  15. // for more details.
  16. //
  17. // $Log:$
  18. //
  19. // DESCRIPTION:
  20. //      Random number LUT.
  21. //
  22. //-----------------------------------------------------------------------------
  23.  
  24. static const char rcsid[] = "$Id: m_random.c,v 1.1 1997/02/03 22:45:11 b1 Exp $";
  25.  
  26.  
  27. //
  28. // M_Random
  29. // Returns a 0-255 number
  30. //
  31. unsigned char rndtable[256] = {
  32.     0,   8, 109, 220, 222, 241, 149, 107,  75, 248, 254, 140,  16,  66 ,
  33.     74,  21, 211,  47,  80, 242, 154,  27, 205, 128, 161,  89,  77,  36 ,
  34.     95, 110,  85,  48, 212, 140, 211, 249,  22,  79, 200,  50,  28, 188 ,
  35.     52, 140, 202, 120,  68, 145,  62,  70, 184, 190,  91, 197, 152, 224 ,
  36.     149, 104,  25, 178, 252, 182, 202, 182, 141, 197,   4,  81, 181, 242 ,
  37.     145,  42,  39, 227, 156, 198, 225, 193, 219,  93, 122, 175, 249,   0 ,
  38.     175, 143,  70, 239,  46, 246, 163,  53, 163, 109, 168, 135,   2, 235 ,
  39.     25,  92,  20, 145, 138,  77,  69, 166,  78, 176, 173, 212, 166, 113 ,
  40.     94, 161,  41,  50, 239,  49, 111, 164,  70,  60,   2,  37, 171,  75 ,
  41.     136, 156,  11,  56,  42, 146, 138, 229,  73, 146,  77,  61,  98, 196 ,
  42.     135, 106,  63, 197, 195,  86,  96, 203, 113, 101, 170, 247, 181, 113 ,
  43.     80, 250, 108,   7, 255, 237, 129, 226,  79, 107, 112, 166, 103, 241 ,
  44.     24, 223, 239, 120, 198,  58,  60,  82, 128,   3, 184,  66, 143, 224 ,
  45.     145, 224,  81, 206, 163,  45,  63,  90, 168, 114,  59,  33, 159,  95 ,
  46.     28, 139, 123,  98, 125, 196,  15,  70, 194, 253,  54,  14, 109, 226 ,
  47.     71,  17, 161,  93, 186,  87, 244, 138,  20,  52, 123, 251,  26,  36 ,
  48.     17,  46,  52, 231, 232,  76,  31, 221,  84,  37, 216, 165, 212, 106 ,
  49.     197, 242,  98,  43,  39, 175, 254, 145, 190,  84, 118, 222, 187, 136 ,
  50.     120, 163, 236, 249
  51. };
  52.  
  53. int     rndindex = 0;
  54. int     prndindex = 0;
  55.  
  56. // Which one is deterministic?
  57. int P_Random (void)
  58. {
  59.     prndindex = (prndindex+1)&0xff;
  60.     return rndtable[prndindex];
  61. }
  62.  
  63. int M_Random (void)
  64. {
  65.     rndindex = (rndindex+1)&0xff;
  66.     return rndtable[rndindex];
  67. }
  68.  
  69. void M_ClearRandom (void)
  70. {
  71.     rndindex = prndindex = 0;
  72. }
  73.  
  74.  
  75.  
  76.  
  77.