1 //
2 // Copyright(C) 1993-1996 Id Software, Inc.
3 // Copyright(C) 2005-2014 Simon Howard
4 //
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License
7 // as published by the Free Software Foundation; either version 2
8 // of the License, or (at your option) any later version.
9 //
10 // This program is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 // GNU General Public License for more details.
14 //
15 // DESCRIPTION:
16 // Random number LUT.
17 //
18
19
20 #include <time.h>
21
22 #include "m_random.h"
23
24 //
25 // M_Random
26 // Returns a 0-255 number
27 //
28
29 static const unsigned char rndtable[256] = {
30 0, 8, 109, 220, 222, 241, 149, 107, 75, 248, 254, 140, 16, 66 ,
31 74, 21, 211, 47, 80, 242, 154, 27, 205, 128, 161, 89, 77, 36 ,
32 95, 110, 85, 48, 212, 140, 211, 249, 22, 79, 200, 50, 28, 188 ,
33 52, 140, 202, 120, 68, 145, 62, 70, 184, 190, 91, 197, 152, 224 ,
34 149, 104, 25, 178, 252, 182, 202, 182, 141, 197, 4, 81, 181, 242 ,
35 145, 42, 39, 227, 156, 198, 225, 193, 219, 93, 122, 175, 249, 0 ,
36 175, 143, 70, 239, 46, 246, 163, 53, 163, 109, 168, 135, 2, 235 ,
37 25, 92, 20, 145, 138, 77, 69, 166, 78, 176, 173, 212, 166, 113 ,
38 94, 161, 41, 50, 239, 49, 111, 164, 70, 60, 2, 37, 171, 75 ,
39 136, 156, 11, 56, 42, 146, 138, 229, 73, 146, 77, 61, 98, 196 ,
40 135, 106, 63, 197, 195, 86, 96, 203, 113, 101, 170, 247, 181, 113 ,
41 80, 250, 108, 7, 255, 237, 129, 226, 79, 107, 112, 166, 103, 241 ,
42 24, 223, 239, 120, 198, 58, 60, 82, 128, 3, 184, 66, 143, 224 ,
43 145, 224, 81, 206, 163, 45, 63, 90, 168, 114, 59, 33, 159, 95 ,
44 28, 139, 123, 98, 125, 196, 15, 70, 194, 253, 54, 14, 109, 226 ,
45 71, 17, 161, 93, 186, 87, 244, 138, 20, 52, 123, 251, 26, 36 ,
46 17, 46, 52, 231, 232, 76, 31, 221, 84, 37, 216, 165, 212, 106 ,
47 197, 242, 98, 43, 39, 175, 254, 145, 190, 84, 118, 222, 187, 136 ,
48 120, 163, 236, 249
49 };
50
51 int rndindex = 0;
52 int prndindex = 0;
53
54 // Which one is deterministic?
P_Random(void)55 int P_Random (void)
56 {
57 prndindex = (prndindex+1)&0xff;
58 return rndtable[prndindex];
59 }
60
M_Random(void)61 int M_Random (void)
62 {
63 rndindex = (rndindex+1)&0xff;
64 return rndtable[rndindex];
65 }
66
67 //
68 // M_ClearRandom
69 //
70 // haleyjd 20110204 [STRIFE]: No "seeding" of M_Random index
71 //
M_ClearRandom(void)72 void M_ClearRandom (void)
73 {
74 prndindex = 0;
75 rndindex = 0;
76 }
77
78
79
80
81