From 47f4a458d636a889e955e68f896708f1276febc0 Mon Sep 17 00:00:00 2001 From: Dave Chapman Date: Tue, 28 Mar 2006 15:44:01 +0000 Subject: Patch #2969 - Doom! Currently only working on the H300. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9312 a1c6a512-1295-4272-9138-f99709370657 --- apps/plugins/doom/m_random.c | 136 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 136 insertions(+) create mode 100644 apps/plugins/doom/m_random.c (limited to 'apps/plugins/doom/m_random.c') diff --git a/apps/plugins/doom/m_random.c b/apps/plugins/doom/m_random.c new file mode 100644 index 0000000000..2c43aaf54c --- /dev/null +++ b/apps/plugins/doom/m_random.c @@ -0,0 +1,136 @@ +/* Emacs style mode select -*- C++ -*- + *----------------------------------------------------------------------------- + * + * + * PrBoom a Doom port merged with LxDoom and LSDLDoom + * based on BOOM, a modified and improved DOOM engine + * Copyright (C) 1999 by + * id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman + * Copyright (C) 1999-2000 by + * Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze + * + * 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. + * + * DESCRIPTION: + * Random number LUT. + * + * 1/19/98 killough: Rewrote random number generator for better randomness, + * while at the same time maintaining demo sync and backward compatibility. + * + * 2/16/98 killough: Made each RNG local to each control-equivalent block, + * to reduce the chances of demo sync problems. + * + *-----------------------------------------------------------------------------*/ + + +#include "doomstat.h" +#include "m_random.h" + +// +// M_Random +// Returns a 0-255 number +// +static const unsigned char rndtable[256] = { // 1/19/98 killough -- made const + 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 + }; + +rng_t rng; // the random number state + +unsigned long rngseed = 1993; // killough 3/26/98: The seed + +int P_Random(pr_class_t pr_class) +{ + // killough 2/16/98: We always update both sets of random number + // generators, to ensure repeatability if the demo_compatibility + // flag is changed while the program is running. Changing the + // demo_compatibility flag does not change the sequences generated, + // only which one is selected from. + // + // All of this RNG stuff is tricky as far as demo sync goes -- + // it's like playing with explosives :) Lee + + int compat = pr_class == pr_misc ? + (rng.prndindex = (rng.prndindex + 1) & 255) : + (rng. rndindex = (rng. rndindex + 1) & 255) ; + + unsigned long boom; + + // killough 3/31/98: + // If demo sync insurance is not requested, use + // much more unstable method by putting everything + // except pr_misc into pr_all_in_one + + if (pr_class != pr_misc && !demo_insurance) // killough 3/31/98 + pr_class = pr_all_in_one; + + boom = rng.seed[pr_class]; + + // killough 3/26/98: add pr_class*2 to addend + + rng.seed[pr_class] = boom * 1664525ul + 221297ul + pr_class*2; + + if (demo_compatibility) + return rndtable[compat]; + + boom >>= 20; + + /* killough 3/30/98: use gametic-levelstarttic to shuffle RNG + * killough 3/31/98: but only if demo insurance requested, + * since it's unnecessary for random shuffling otherwise + * killough 9/29/98: but use basetic now instead of levelstarttic + * cph - DEMOSYNC - this change makes MBF demos work, + * but does it break Boom ones? + */ + + if (demo_insurance) + boom += (gametic-basetic)*7; + + return boom & 255; +} + +// Initialize all the seeds +// +// This initialization method is critical to maintaining demo sync. +// Each seed is initialized according to its class, so if new classes +// are added they must be added to end of pr_class_t list. killough +// + +void M_ClearRandom (void) +{ + int i; + unsigned long seed = rngseed*2+1; // add 3/26/98: add rngseed + for (i=0; i