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