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+/* 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
+ *  Copyright 2005, 2006 by
+ *  Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
+ *
+ *  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:
+ *  Functions to return random numbers.
+ *
+ *-----------------------------------------------------------------------------*/
+
+
+#ifndef __M_RANDOM__
+#define __M_RANDOM__
+
+#include "doomtype.h"
+
+// killough 1/19/98: rewritten to use to use a better random number generator
+// in the new engine, although the old one is available for compatibility.
+
+// killough 2/16/98:
+//
+// Make every random number generator local to each control-equivalent block.
+// Critical for demo sync. Changing the order of this list breaks all previous
+// versions' demos. The random number generators are made local to reduce the
+// chances of sync problems. In Doom, if a single random number generator call
+// was off, it would mess up all random number generators. This reduces the
+// chances of it happening by making each RNG local to a control flow block.
+//
+// Notes to developers: if you want to reduce your demo sync hassles, follow
+// this rule: for each call to P_Random you add, add a new class to the enum
+// type below for each block of code which calls P_Random. If two calls to
+// P_Random are not in "control-equivalent blocks", i.e. there are any cases
+// where one is executed, and the other is not, put them in separate classes.
+//
+// Keep all current entries in this list the same, and in the order
+// indicated by the #'s, because they're critical for preserving demo
+// sync. Do not remove entries simply because they become unused later.
+
+typedef enum {
+  pr_skullfly,                // #1
+  pr_damage,                  // #2
+  pr_crush,                   // #3
+  pr_genlift,                 // #4
+  pr_killtics,                // #5
+  pr_damagemobj,              // #6
+  pr_painchance,              // #7
+  pr_lights,                  // #8
+  pr_explode,                 // #9
+  pr_respawn,                 // #10
+  pr_lastlook,                // #11
+  pr_spawnthing,              // #12
+  pr_spawnpuff,               // #13
+  pr_spawnblood,              // #14
+  pr_missile,                 // #15
+  pr_shadow,                  // #16
+  pr_plats,                   // #17
+  pr_punch,                   // #18
+  pr_punchangle,              // #19
+  pr_saw,                     // #20
+  pr_plasma,                  // #21
+  pr_gunshot,                 // #22
+  pr_misfire,                 // #23
+  pr_shotgun,                 // #24
+  pr_bfg,                     // #25
+  pr_slimehurt,               // #26
+  pr_dmspawn,                 // #27
+  pr_missrange,               // #28
+  pr_trywalk,                 // #29
+  pr_newchase,                // #30
+  pr_newchasedir,             // #31
+  pr_see,                     // #32
+  pr_facetarget,              // #33
+  pr_posattack,               // #34
+  pr_sposattack,              // #35
+  pr_cposattack,              // #36
+  pr_spidrefire,              // #37
+  pr_troopattack,             // #38
+  pr_sargattack,              // #39
+  pr_headattack,              // #40
+  pr_bruisattack,             // #41
+  pr_tracer,                  // #42
+  pr_skelfist,                // #43
+  pr_scream,                  // #44
+  pr_brainscream,             // #45
+  pr_cposrefire,              // #46
+  pr_brainexp,                // #47
+  pr_spawnfly,                // #48
+  pr_misc,                    // #49
+  pr_all_in_one,              // #50
+  /* CPhipps - new entries from MBF, mostly unused for now */
+  pr_opendoor,                // #51
+  pr_targetsearch,            // #52
+  pr_friends,                 // #53
+  pr_threshold,               // #54
+  pr_skiptarget,              // #55
+  pr_enemystrafe,             // #56
+  pr_avoidcrush,              // #57
+  pr_stayonlift,              // #58
+  pr_helpfriend,              // #59
+  pr_dropoff,                 // #60
+  pr_randomjump,              // #61
+  pr_defect,                  // #62  // Start new entries -- add new entries below
+
+  // End of new entries
+  NUMPRCLASS               // MUST be last item in list
+} pr_class_t;
+
+// The random number generator's state.
+typedef struct {
+  unsigned long seed[NUMPRCLASS];      // Each block's random seed
+  int rndindex, prndindex;             // For compatibility support
+} rng_t;
+
+extern rng_t rng;                      // The rng's state
+
+extern unsigned long rngseed;          // The starting seed (not part of state)
+
+// As M_Random, but used by the play simulation.
+int P_Random(pr_class_t DA(const char *, int));
+
+#ifdef INSTRUMENTED
+#define P_Random(a) (P_Random) (a, __FILE__,__LINE__)
+#endif
+
+// Returns a number from 0 to 255,
+#define M_Random() P_Random(pr_misc)
+
+// Fix randoms for demos.
+void M_ClearRandom(void);
+
+#endif