1 ; Catacomb Armageddon Source Code
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2 ; Copyright (C) 1993-2014 Flat Rock Software
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4 ; This program is free software; you can redistribute it and/or modify
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5 ; it under the terms of the GNU General Public License as published by
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6 ; the Free Software Foundation; either version 2 of the License, or
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7 ; (at your option) any later version.
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9 ; This program is distributed in the hope that it will be useful,
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10 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ; GNU General Public License for more details.
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14 ; You should have received a copy of the GNU General Public License along
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15 ; with this program; if not, write to the Free Software Foundation, Inc.,
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16 ; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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21 ; Assembly portion of the User Mgr. This is just John Carmack's table
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22 ; driven pseudo-random number generator, and we put it in the User Mgr
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23 ; because we couldn't figure out where it should go
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26 ;============================================================================
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30 ;============================================================================
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36 rndtable db 0, 8, 109, 220, 222, 241, 149, 107, 75, 248, 254, 140, 16, 66
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37 db 74, 21, 211, 47, 80, 242, 154, 27, 205, 128, 161, 89, 77, 36
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38 db 95, 110, 85, 48, 212, 140, 211, 249, 22, 79, 200, 50, 28, 188
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39 db 52, 140, 202, 120, 68, 145, 62, 70, 184, 190, 91, 197, 152, 224
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40 db 149, 104, 25, 178, 252, 182, 202, 182, 141, 197, 4, 81, 181, 242
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41 db 145, 42, 39, 227, 156, 198, 225, 193, 219, 93, 122, 175, 249, 0
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42 db 175, 143, 70, 239, 46, 246, 163, 53, 163, 109, 168, 135, 2, 235
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43 db 25, 92, 20, 145, 138, 77, 69, 166, 78, 176, 173, 212, 166, 113
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44 db 94, 161, 41, 50, 239, 49, 111, 164, 70, 60, 2, 37, 171, 75
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45 db 136, 156, 11, 56, 42, 146, 138, 229, 73, 146, 77, 61, 98, 196
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46 db 135, 106, 63, 197, 195, 86, 96, 203, 113, 101, 170, 247, 181, 113
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47 db 80, 250, 108, 7, 255, 237, 129, 226, 79, 107, 112, 166, 103, 241
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48 db 24, 223, 239, 120, 198, 58, 60, 82, 128, 3, 184, 66, 143, 224
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49 db 145, 224, 81, 206, 163, 45, 63, 90, 168, 114, 59, 33, 159, 95
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50 db 28, 139, 123, 98, 125, 196, 15, 70, 194, 253, 54, 14, 109, 226
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51 db 71, 17, 161, 93, 186, 87, 244, 138, 20, 52, 123, 251, 26, 36
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52 db 17, 46, 52, 231, 232, 76, 31, 221, 84, 37, 216, 165, 212, 106
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53 db 197, 242, 98, 43, 39, 175, 254, 145, 190, 84, 118, 222, 187, 136
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54 db 120, 163, 236, 249
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61 ;=================================================
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63 ; void US_InitRndT (boolean randomize)
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64 ; Init table based RND generator
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65 ; if randomize is false, the counter is set to 0
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67 ;=================================================
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69 PROC US_InitRndT randomize:word
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77 jne @@timeit ;if randomize is true, really random
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79 mov dx,0 ;set to a definite value
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84 int 21h ;GetSystemTime
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88 mov [es:rndindex],dx
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93 ;=================================================
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95 ; int US_RndT (void)
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96 ; Return a random # between 0-255
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99 ;=================================================
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103 mov ax,SEG rndtable
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105 mov bx,[es:rndindex]
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108 mov [es:rndindex],bx
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109 mov al,[es:rndtable+BX]
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