1 files changed, 1394 insertions, 0 deletions

diff --git a/apps/plugins/doom/p_mobj.c b/apps/plugins/doom/p_mobj.c
new file mode 100644
index 0000000000..3aaaf4510a
--- /dev/null
+++ b/apps/plugins/doom/p_mobj.c
@@ -0,0 +1,1394 @@
+/* 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:
+ *      Moving object handling. Spawn functions.
+ *
+ *-----------------------------------------------------------------------------*/
+
+#include "doomdef.h"
+#include "doomstat.h"
+#include "m_random.h"
+#include "r_main.h"
+#include "p_maputl.h"
+#include "p_map.h"
+#include "p_tick.h"
+#include "sounds.h"
+#include "st_stuff.h"
+#include "hu_stuff.h"
+#include "s_sound.h"
+#include "info.h"
+#include "g_game.h"
+#include "p_inter.h"
+#include "rockmacros.h"
+//
+// P_SetMobjState
+// Returns true if the mobj is still present.
+//
+
+statenum_t i IBSS_ATTR;                       // initial state
+statenum_t seenstate_tab[NUMSTATES] IBSS_ATTR; // fast transition table
+
+boolean P_SetMobjState(mobj_t* mobj,statenum_t state)
+{
+   state_t*  st;
+   // killough 4/9/98: remember states seen, to detect cycles:
+   statenum_t *seenstate = seenstate_tab;      // pointer to table
+   static int recursion;                       // detects recursion
+   i = state;
+   boolean ret = true;                         // return value
+
+   if (recursion++)                            // if recursion detected,
+      memset(seenstate,0,sizeof(seenstate_tab)); // clear state table
+
+   do
+   {
+      if (state == S_NULL)
+      {
+         mobj->state = (state_t *) S_NULL;
+         P_RemoveMobj (mobj);
+         ret = false;
+         break;                 // killough 4/9/98
+      }
+
+      st = &states[state];
+      mobj->state = st;
+      mobj->tics = st->tics;
+      mobj->sprite = st->sprite;
+      mobj->frame = st->frame;
+
+      // Modified handling.
+      // Call action functions when the state is set
+
+      if (st->action)
+         st->action(mobj);
+
+      seenstate[state] = 1 + st->nextstate;   // killough 4/9/98
+
+      state = st->nextstate;
+   } while (!mobj->tics && !seenstate[state]);   // killough 4/9/98
+
+   if (ret && !mobj->tics)  // killough 4/9/98: detect state cycles
+      doom_printf("Warning: State Cycle Detected");
+
+   if (!--recursion)
+      for (;(state=seenstate[i]);i=state-1)
+         seenstate[i] = 0;  // killough 4/9/98: erase memory of states
+
+   return ret;
+}
+
+
+//
+// P_ExplodeMissile
+//
+
+void P_ExplodeMissile (mobj_t* mo)
+{
+   mo->momx = mo->momy = mo->momz = 0;
+
+   P_SetMobjState (mo, mobjinfo[mo->type].deathstate);
+
+   mo->tics -= P_Random(pr_explode)&3;
+
+   if (mo->tics < 1)
+      mo->tics = 1;
+
+   mo->flags &= ~MF_MISSILE;
+
+   if (mo->info->deathsound)
+      S_StartSound (mo, mo->info->deathsound);
+}
+
+
+//
+// P_XYMovement
+//
+// Attempts to move something if it has momentum.
+//
+
+void P_XYMovement (mobj_t* mo)
+{
+   player_t *player;
+   fixed_t xmove, ymove;
+#if 0
+   fixed_t   ptryx;
+   fixed_t   ptryy;
+   fixed_t   xmove;
+   fixed_t   ymove;
+   fixed_t   oldx,oldy; // phares 9/10/98: reducing bobbing/momentum on ice
+   // when up against walls
+#endif
+   if (!(mo->momx | mo->momy)) // Any momentum?
+   {
+      if (mo->flags & MF_SKULLFLY)
+      {
+
+         // the skull slammed into something
+
+         mo->flags &= ~MF_SKULLFLY;
+         mo->momz = 0;
+
+         P_SetMobjState (mo, mo->info->spawnstate);
+      }
+      return;
+   }
+
+   player = mo->player;
+
+   if (mo->momx > MAXMOVE)
+      mo->momx = MAXMOVE;
+   else if (mo->momx < -MAXMOVE)
+      mo->momx = -MAXMOVE;
+
+   if (mo->momy > MAXMOVE)
+      mo->momy = MAXMOVE;
+   else if (mo->momy < -MAXMOVE)
+      mo->momy = -MAXMOVE;
+
+   xmove = mo->momx;
+   ymove = mo->momy;
+
+#if 0
+   oldx = mo->x; // phares 9/10/98: new code to reduce bobbing/momentum
+   oldy = mo->y; // when on ice & up against wall. These will be compared
+   // to your x,y values later to see if you were able to move
+#endif
+
+   do
+   {
+      fixed_t ptryx, ptryy;
+      // killough 8/9/98: fix bug in original Doom source:
+      // Large negative displacements were never considered.
+      // This explains the tendency for Mancubus fireballs
+      // to pass through walls.
+      // CPhipps - compatibility optioned
+
+      if (xmove > MAXMOVE/2 || ymove > MAXMOVE/2 ||
+            (!comp[comp_moveblock]
+             && (xmove < -MAXMOVE/2 || ymove < -MAXMOVE/2)))
+      {
+         ptryx = mo->x + xmove/2;
+         ptryy = mo->y + ymove/2;
+         xmove >>= 1;
+         ymove >>= 1;
+      }
+      else
+      {
+         ptryx = mo->x + xmove;
+         ptryy = mo->y + ymove;
+         xmove = ymove = 0;
+      }
+
+      // killough 3/15/98: Allow objects to drop off
+
+      if (!P_TryMove (mo, ptryx, ptryy, true))
+      {
+         // blocked move
+
+         // killough 8/11/98: bouncing off walls
+         // killough 10/98:
+         // Add ability for objects other than players to bounce on ice
+
+         if (!(mo->flags & MF_MISSILE) &&
+               mbf_features &&
+               (mo->flags & MF_BOUNCES ||
+                (!player && blockline &&
+                 variable_friction && mo->z <= mo->floorz &&
+                 P_GetFriction(mo, NULL) > ORIG_FRICTION)))
+         {
+            if (blockline)
+            {
+               fixed_t r = ((blockline->dx >> FRACBITS) * mo->momx +
+                            (blockline->dy >> FRACBITS) * mo->momy) /
+                           ((blockline->dx >> FRACBITS)*(blockline->dx >> FRACBITS)+
+                            (blockline->dy >> FRACBITS)*(blockline->dy >> FRACBITS));
+               fixed_t x = FixedMul(r, blockline->dx);
+               fixed_t y = FixedMul(r, blockline->dy);
+
+               // reflect momentum away from wall
+
+               mo->momx = x*2 - mo->momx;
+               mo->momy = y*2 - mo->momy;
+
+               // if under gravity, slow down in
+               // direction perpendicular to wall.
+
+               if (!(mo->flags & MF_NOGRAVITY))
+               {
+                  mo->momx = (mo->momx + x)/2;
+                  mo->momy = (mo->momy + y)/2;
+               }
+            }
+            else
+               mo->momx = mo->momy = 0;
+         }
+         else
+            if (player)   // try to slide along it
+               P_SlideMove (mo);
+            else
+               if (mo->flags & MF_MISSILE)
+               {
+                  // explode a missile
+
+                  if (ceilingline &&
+                        ceilingline->backsector &&
+                        ceilingline->backsector->ceilingpic == skyflatnum)
+                     if (demo_compatibility ||  // killough
+                           mo->z > ceilingline->backsector->ceilingheight)
+                     {
+                        // Hack to prevent missiles exploding
+                        // against the sky.
+                        // Does not handle sky floors.
+
+                        P_RemoveMobj (mo);
+                        return;
+                     }
+                  P_ExplodeMissile (mo);
+               }
+               else // whatever else it is, it is now standing still in (x,y)
+                  mo->momx = mo->momy = 0;
+      }
+   } while (xmove || ymove);
+
+   // slow down
+
+#if 0  /* killough 10/98: this is unused code (except maybe in .deh files?) */
+   if (player && player->cheats & CF_NOMOMENTUM)
+   {
+      // debug option for no sliding at all
+      mo->momx = mo->momy = 0;
+      player->momx = player->momy = 0;         /* killough 10/98 */
+      return;
+   }
+#endif
+
+   /* no friction for missiles or skulls ever, no friction when airborne */
+   if (mo->flags & (MF_MISSILE | MF_SKULLFLY) || mo->z > mo->floorz)
+      return;
+
+   /* killough 8/11/98: add bouncers
+    * killough 9/15/98: add objects falling off ledges
+    * killough 11/98: only include bouncers hanging off ledges
+    */
+   if (((mo->flags & MF_BOUNCES && mo->z > mo->dropoffz) ||
+         mo->flags & MF_CORPSE || mo->intflags & MIF_FALLING) &&
+         (mo->momx > FRACUNIT/4 || mo->momx < -FRACUNIT/4 ||
+          mo->momy > FRACUNIT/4 || mo->momy < -FRACUNIT/4) &&
+         mo->floorz != mo->subsector->sector->floorheight)
+      return;  // do not stop sliding if halfway off a step with some momentum
+
+   // killough 11/98:
+   // Stop voodoo dolls that have come to rest, despite any
+   // moving corresponding player, except in old demos:
+
+   if (mo->momx > -STOPSPEED && mo->momx < STOPSPEED &&
+         mo->momy > -STOPSPEED && mo->momy < STOPSPEED &&
+         (!player || !(player->cmd.forwardmove | player->cmd.sidemove) ||
+          (player->mo != mo && compatibility_level >= lxdoom_1_compatibility)))
+   {
+      // if in a walking frame, stop moving
+
+      // killough 10/98:
+      // Don't affect main player when voodoo dolls stop, except in old demos:
+
+      if (player && (unsigned)(player->mo->state - states - S_PLAY_RUN1) < 4
+            && (player->mo == mo || compatibility_level >= lxdoom_1_compatibility))
+         P_SetMobjState(player->mo, S_PLAY);
+
+      mo->momx = mo->momy = 0;
+
+      /* killough 10/98: kill any bobbing momentum too (except in voodoo dolls)
+       * cph - DEMOSYNC - needs compatibility check?
+       */
+      if (player && player->mo == mo)
+         player->momx = player->momy = 0;
+   }
+   else
+   {
+      /* phares 3/17/98
+       *
+       * Friction will have been adjusted by friction thinkers for
+       * icy or muddy floors. Otherwise it was never touched and
+       * remained set at ORIG_FRICTION
+       *
+       * killough 8/28/98: removed inefficient thinker algorithm,
+       * instead using touching_sectorlist in P_GetFriction() to
+       * determine friction (and thus only when it is needed).
+       *
+       * killough 10/98: changed to work with new bobbing method.
+       * Reducing player momentum is no longer needed to reduce
+       * bobbing, so ice works much better now.
+       *
+       * cph - DEMOSYNC - need old code for Boom demos?
+       */
+
+      fixed_t friction = P_GetFriction(mo, NULL);
+
+      mo->momx = FixedMul(mo->momx, friction);
+      mo->momy = FixedMul(mo->momy, friction);
+
+      /* killough 10/98: Always decrease player bobbing by ORIG_FRICTION.
+       * This prevents problems with bobbing on ice, where it was not being
+       * reduced fast enough, leading to all sorts of kludges being developed.
+       */
+
+      if (player && player->mo == mo)     /* Not voodoo dolls */
+      {
+         player->momx = FixedMul(player->momx, ORIG_FRICTION);
+         player->momy = FixedMul(player->momy, ORIG_FRICTION);
+      }
+
+   }
+}
+
+
+//
+// P_ZMovement
+//
+// Attempt vertical movement.
+
+static void P_ZMovement (mobj_t* mo)
+{
+   /* killough 7/11/98:
+    * BFG fireballs bounced on floors and ceilings in Pre-Beta Doom
+    * killough 8/9/98: added support for non-missile objects bouncing
+    * (e.g. grenade, mine, pipebomb)
+    */
+
+   if (mo->flags & MF_BOUNCES && mo->momz) {
+      mo->z += mo->momz;
+      if (mo->z <= mo->floorz) {                /* bounce off floors */
+         mo->z = mo->floorz;
+         if (mo->momz < 0) {
+            mo->momz = -mo->momz;
+            if (!(mo->flags & MF_NOGRAVITY)) { /* bounce back with decay */
+               mo->momz = mo->flags & MF_FLOAT ?   // floaters fall slowly
+                          mo->flags & MF_DROPOFF ?          // DROPOFF indicates rate
+                          FixedMul(mo->momz, (fixed_t)(FRACUNIT*.85)) :
+                          FixedMul(mo->momz, (fixed_t)(FRACUNIT*.70)) :
+                                FixedMul(mo->momz, (fixed_t)(FRACUNIT*.45)) ;
+
+               /* Bring it to rest below a certain speed */
+               if (abs(mo->momz) <= mo->info->mass*(GRAVITY*4/256))
+                  mo->momz = 0;
+            }
+
+            /* killough 11/98: touchy objects explode on impact */
+            if (mo->flags & MF_TOUCHY && mo->intflags & MIF_ARMED
+                  && mo->health > 0)
+               P_DamageMobj(mo, NULL, NULL, mo->health);
+            else if (mo->flags & MF_FLOAT && sentient(mo))
+               goto floater;
+            return;
+         }
+} else if (mo->z >= mo->ceilingz - mo->height) {
+         /* bounce off ceilings */
+         mo->z = mo->ceilingz - mo->height;
+         if (mo->momz > 0) {
+            if (mo->subsector->sector->ceilingpic != skyflatnum)
+               mo->momz = -mo->momz;    /* always bounce off non-sky ceiling */
+            else if (mo->flags & MF_MISSILE)
+               P_RemoveMobj(mo);        /* missiles don't bounce off skies */
+            else if (mo->flags & MF_NOGRAVITY)
+               mo->momz = -mo->momz; // bounce unless under gravity
+
+            if (mo->flags & MF_FLOAT && sentient(mo))
+               goto floater;
+
+            return;
+         }
+      } else {
+         if (!(mo->flags & MF_NOGRAVITY))      /* free-fall under gravity */
+            mo->momz -= mo->info->mass*(GRAVITY/256);
+
+         if (mo->flags & MF_FLOAT && sentient(mo)) goto floater;
+         return;
+      }
+
+      /* came to a stop */
+      mo->momz = 0;
+
+      if (mo->flags & MF_MISSILE) {
+         if (ceilingline &&
+               ceilingline->backsector &&
+               ceilingline->backsector->ceilingpic == skyflatnum &&
+               mo->z > ceilingline->backsector->ceilingheight)
+            P_RemoveMobj(mo);  /* don't explode on skies */
+         else
+            P_ExplodeMissile(mo);
+      }
+
+      if (mo->flags & MF_FLOAT && sentient(mo)) goto floater;
+      return;
+   }
+
+   /* killough 8/9/98: end bouncing object code */
+
+   // check for smooth step up
+
+   if (mo->player &&
+         mo->player->mo == mo &&  // killough 5/12/98: exclude voodoo dolls
+         mo->z < mo->floorz)
+   {
+      mo->player->viewheight -= mo->floorz-mo->z;
+      mo->player->deltaviewheight = (VIEWHEIGHT - mo->player->viewheight)>>3;
+   }
+
+   // adjust altitude
+
+   mo->z += mo->momz;
+
+floater:
+   if ((mo->flags & MF_FLOAT) && mo->target)
+
+      // float down towards target if too close
+
+      if (!((mo->flags ^ MF_FLOAT) & (MF_FLOAT | MF_SKULLFLY | MF_INFLOAT)) &&
+            mo->target)     /* killough 11/98: simplify */
+      {
+         fixed_t delta;
+         if (P_AproxDistance(mo->x - mo->target->x, mo->y - mo->target->y) <
+               abs(delta = mo->target->z + (mo->height>>1) - mo->z)*3)
+            mo->z += delta < 0 ? -FLOATSPEED : FLOATSPEED;
+      }
+
+   // clip movement
+
+   if (mo->z <= mo->floorz)
+   {
+      // hit the floor
+
+      /* Note (id):
+       *  somebody left this after the setting momz to 0,
+       *  kinda useless there.
+       * cph - This was the a bug in the linuxdoom-1.10 source which
+       *  caused it not to sync Doom 2 v1.9 demos. Someone
+       *  added the above comment and moved up the following code. So
+       *  demos would desync in close lost soul fights.
+       * Note that this only applies to original Doom 1 or Doom2 demos -
+       *  Final Doom and Ultimate Doom.  So we test demo_compatibility *and*
+       *  gamemission. (Note we assume that Doom1 is always Ult Doom, which
+       *  seems to hold for most published demos.)
+       */
+      int correct_lost_soul_bounce = !demo_compatibility || (gamemission != doom2);
+
+      if (correct_lost_soul_bounce && mo->flags & MF_SKULLFLY)
+         mo->momz = -mo->momz; // the skull slammed into something
+
+      if (mo->momz < 0)
+      {
+         /* killough 11/98: touchy objects explode on impact */
+         if (mo->flags & MF_TOUCHY && mo->intflags & MIF_ARMED && mo->health > 0)
+            P_DamageMobj(mo, NULL, NULL, mo->health);
+         else
+            if (mo->player && /* killough 5/12/98: exclude voodoo dolls */
+                  mo->player->mo == mo && mo->momz < -GRAVITY*8)
+            {
+               // Squat down.
+               // Decrease viewheight for a moment
+               // after hitting the ground (hard),
+               // and utter appropriate sound.
+
+               mo->player->deltaviewheight = mo->momz>>3;
+               if (mo->health) /* cph - prevent "oof" when dead */
+                  S_StartSound (mo, sfx_oof);
+            }
+         mo->momz = 0;
+      }
+      mo->z = mo->floorz;
+
+      /* cph 2001/05/26 -
+       * See lost soul bouncing comment above. We need this here for bug
+       * compatibility with original Doom2 v1.9 - if a soul is charging and
+       * hit by a raising floor this incorrectly reverses its Y momentum.
+       */
+      if (!correct_lost_soul_bounce && mo->flags & MF_SKULLFLY)
+         mo->momz = -mo->momz; // the skull slammed into something
+
+      if ( (mo->flags & MF_MISSILE) && !(mo->flags & MF_NOCLIP) )
+      {
+         P_ExplodeMissile (mo);
+         return;
+      }
+   }
+   else // still above the floor                                     // phares
+      if (!(mo->flags & MF_NOGRAVITY))
+      {
+         if (!mo->momz)
+            mo->momz = -GRAVITY;
+         mo->momz -= GRAVITY;
+      }
+
+   if (mo->z + mo->height > mo->ceilingz)
+   {
+
+      // hit the ceiling
+
+      if (mo->momz > 0)
+         mo->momz = 0;
+
+      mo->z = mo->ceilingz - mo->height;
+
+      if (mo->flags & MF_SKULLFLY)
+         mo->momz = -mo->momz; // the skull slammed into something
+
+      if ( (mo->flags & MF_MISSILE) && !(mo->flags & MF_NOCLIP) )
+      {
+         P_ExplodeMissile (mo);
+         return;
+      }
+   }
+}
+
+//
+// P_NightmareRespawn
+//
+
+void P_NightmareRespawn(mobj_t* mobj)
+{
+   fixed_t      x;
+   fixed_t      y;
+   fixed_t      z;
+   subsector_t* ss;
+   mobj_t*      mo;
+   mapthing_t*  mthing;
+
+   x = mobj->spawnpoint.x << FRACBITS;
+   y = mobj->spawnpoint.y << FRACBITS;
+
+   /* haleyjd: stupid nightmare respawning bug fix
+    *
+    * 08/09/00: compatibility added, time to ramble :)
+    * This fixes the notorious nightmare respawning bug that causes monsters
+    * that didn't spawn at level startup to respawn at the point (0,0)
+    * regardless of that point's nature. SMMU and Eternity need this for
+    * script-spawned things like Halif Swordsmythe, as well.
+    *
+    * cph - copied from eternity, except comp_respawnfix becomes comp_respawn
+    *   and the logic is reversed (i.e. like the rest of comp_ it *disables*
+    *   the fix)
+    */
+   if(!comp[comp_respawn] && !x && !y)
+   {
+      // spawnpoint was zeroed out, so use point of death instead
+      x = mobj->x;
+      y = mobj->y;
+   }
+
+   // something is occupying its position?
+
+   if (!P_CheckPosition (mobj, x, y) )
+      return; // no respwan
+
+   // spawn a teleport fog at old spot
+   // because of removal of the body?
+
+   mo = P_SpawnMobj (mobj->x,
+                     mobj->y,
+                     mobj->subsector->sector->floorheight,
+                     MT_TFOG);
+
+   // initiate teleport sound
+
+   S_StartSound (mo, sfx_telept);
+
+   // spawn a teleport fog at the new spot
+
+   ss = R_PointInSubsector (x,y);
+
+   mo = P_SpawnMobj (x, y, ss->sector->floorheight , MT_TFOG);
+
+   S_StartSound (mo, sfx_telept);
+
+   // spawn the new monster
+
+   mthing = &mobj->spawnpoint;
+   if (mobj->info->flags & MF_SPAWNCEILING)
+      z = ONCEILINGZ;
+   else
+      z = ONFLOORZ;
+
+   // inherit attributes from deceased one
+
+   mo = P_SpawnMobj (x,y,z, mobj->type);
+   mo->spawnpoint = mobj->spawnpoint;
+   mo->angle = ANG45 * (mthing->angle/45);
+
+   if (mthing->options & MTF_AMBUSH)
+      mo->flags |= MF_AMBUSH;
+
+   /* killough 11/98: transfer friendliness from deceased */
+   mo->flags = (mo->flags & ~MF_FRIEND) | (mobj->flags & MF_FRIEND);
+
+   mo->reactiontime = 18;
+
+   // remove the old monster,
+
+   P_RemoveMobj (mobj);
+}
+
+
+//
+// P_MobjThinker
+//
+
+void P_MobjThinker (mobj_t* mobj)
+{
+   // killough 11/98:
+   // removed old code which looked at target references
+   // (we use pointer reference counting now)
+
+   // momentum movement
+   if (mobj->momx | mobj->momy || mobj->flags & MF_SKULLFLY)
+   {
+      P_XYMovement(mobj);
+      if (mobj->thinker.function != P_MobjThinker) // cph - Must've been removed
+         return;       // killough - mobj was removed
+   }
+
+   if (mobj->z != mobj->floorz || mobj->momz)
+   {
+      P_ZMovement(mobj);
+      if (mobj->thinker.function != P_MobjThinker) // cph - Must've been removed
+         return;       // killough - mobj was removed
+   }
+   else
+      if (!(mobj->momx | mobj->momy) && !sentient(mobj))
+      {                                  // non-sentient objects at rest
+         mobj->intflags |= MIF_ARMED;     // arm a mine which has come to rest
+
+         // killough 9/12/98: objects fall off ledges if they are hanging off
+         // slightly push off of ledge if hanging more than halfway off
+
+         if (mobj->z > mobj->dropoffz &&      // Only objects contacting dropoff
+               !(mobj->flags & MF_NOGRAVITY) && // Only objects which fall
+               !comp[comp_falloff]) // Not in old demos
+            P_ApplyTorque(mobj);               // Apply torque
+         else
+            mobj->intflags &= ~MIF_FALLING, mobj->gear = 0;  // Reset torque
+      }
+
+   // cycle through states,
+   // calling action functions at transitions
+
+   if (mobj->tics != -1)
+   {
+      mobj->tics--;
+
+      // you can cycle through multiple states in a tic
+
+      if (!mobj->tics)
+         if (!P_SetMobjState (mobj, mobj->state->nextstate) )
+            return;     // freed itself
+   }
+   else
+   {
+
+      // check for nightmare respawn
+
+      if (! (mobj->flags & MF_COUNTKILL) )
+         return;
+
+      if (!respawnmonsters)
+         return;
+
+      mobj->movecount++;
+
+      if (mobj->movecount < 12*35)
+         return;
+
+      if (leveltime & 31)
+         return;
+
+      if (P_Random (pr_respawn) > 4)
+         return;
+
+      P_NightmareRespawn (mobj);
+   }
+
+}
+
+
+//
+// P_SpawnMobj
+//
+mobj_t* P_SpawnMobj(fixed_t x,fixed_t y,fixed_t z,mobjtype_t type)
+{
+   mobj_t*     mobj;
+   state_t*    st;
+   mobjinfo_t* info;
+
+   mobj = Z_Malloc (sizeof(*mobj), PU_LEVEL, NULL);
+   memset (mobj, 0, sizeof (*mobj));
+   info = &mobjinfo[type];
+   mobj->type = type;
+   mobj->info = info;
+   mobj->x = x;
+   mobj->y = y;
+   mobj->radius = info->radius;
+   mobj->height = info->height;                                      // phares
+   mobj->flags  = info->flags;
+
+   /* killough 8/23/98: no friends, bouncers, or touchy things in old demos */
+   if (!mbf_features)
+      mobj->flags &= ~(MF_BOUNCES | MF_FRIEND | MF_TOUCHY);
+   else
+      if (type == MT_PLAYER)         // Except in old demos, players
+         mobj->flags |= MF_FRIEND;    // are always friends.
+
+   mobj->health = info->spawnhealth;
+
+   if (gameskill != sk_nightmare)
+      mobj->reactiontime = info->reactiontime;
+
+   mobj->lastlook = P_Random (pr_lastlook) % MAXPLAYERS;
+
+   // do not set the state with P_SetMobjState,
+   // because action routines can not be called yet
+
+   st = &states[info->spawnstate];
+
+   mobj->state  = st;
+   mobj->tics   = st->tics;
+   mobj->sprite = st->sprite;
+   mobj->frame  = st->frame;
+   mobj->touching_sectorlist = NULL; // NULL head of sector list // phares 3/13/98
+
+   // set subsector and/or block links
+
+   P_SetThingPosition (mobj);
+
+   mobj->dropoffz =           /* killough 11/98: for tracking dropoffs */
+      mobj->floorz   = mobj->subsector->sector->floorheight;
+   mobj->ceilingz = mobj->subsector->sector->ceilingheight;
+
+   mobj->z = z == ONFLOORZ ? mobj->floorz : z == ONCEILINGZ ?
+             mobj->ceilingz - mobj->height : z;
+
+   mobj->thinker.function = P_MobjThinker;
+   mobj->above_thing = 0;                                            // phares
+   mobj->below_thing = 0;                                            // phares
+
+   mobj->target = mobj->tracer = mobj->lastenemy = NULL;
+   P_AddThinker (&mobj->thinker);
+   if (!((mobj->flags ^ MF_COUNTKILL) & (MF_FRIEND | MF_COUNTKILL)))
+      totallive++;
+   return mobj;
+}
+
+
+mapthing_t itemrespawnque[ITEMQUESIZE];
+int        itemrespawntime[ITEMQUESIZE];
+int        iquehead;
+int        iquetail;
+
+
+//
+// P_RemoveMobj
+//
+
+void P_RemoveMobj (mobj_t* mobj)
+{
+   if ((mobj->flags & MF_SPECIAL)
+         && !(mobj->flags & MF_DROPPED)
+         && (mobj->type != MT_INV)
+         && (mobj->type != MT_INS))
+   {
+      itemrespawnque[iquehead] = mobj->spawnpoint;
+      itemrespawntime[iquehead] = leveltime;
+      iquehead = (iquehead+1)&(ITEMQUESIZE-1);
+
+      // lose one off the end?
+
+      if (iquehead == iquetail)
+         iquetail = (iquetail+1)&(ITEMQUESIZE-1);
+   }
+
+   // unlink from sector and block lists
+
+   P_UnsetThingPosition (mobj);
+
+   // Delete all nodes on the current sector_list               phares 3/16/98
+
+   if (sector_list)
+   {
+      P_DelSeclist(sector_list);
+      sector_list = NULL;
+   }
+
+   // stop any playing sound
+
+   S_StopSound (mobj);
+
+   // killough 11/98:
+   //
+   // Remove any references to other mobjs.
+   //
+   // Older demos might depend on the fields being left alone, however,
+   // if multiple thinkers reference each other indirectly before the
+   // end of the current tic.
+   // CPhipps - only leave dead references in old demos; I hope lxdoom_1 level
+   // demos are rare and don't rely on this. I hope.
+
+   if ((compatibility_level >= lxdoom_1_compatibility) ||
+         (!demorecording && !demoplayback)) {
+      P_SetTarget(&mobj->target,    NULL);
+      P_SetTarget(&mobj->tracer,    NULL);
+      P_SetTarget(&mobj->lastenemy, NULL);
+   }
+   // free block
+
+   //  P_RemoveThinker ((thinker_t*)mobj);
+   P_RemoveThinker (&mobj->thinker);
+}
+
+
+/*
+ * P_FindDoomedNum
+ *
+ * Finds a mobj type with a matching doomednum
+ *
+ * killough 8/24/98: rewrote to use hashing
+ */
+
+int P_FindDoomedNum(unsigned type)
+{
+   static struct { int first, next; } *hash;
+   register int i;
+
+   if (!hash)
+   {
+      hash = Z_Malloc(sizeof (*hash) * NUMMOBJTYPES, PU_CACHE, (void*)(void*) &hash);
+      for (i=0; i<NUMMOBJTYPES; i++)
+         hash[i].first = NUMMOBJTYPES;
+      for (i=0; i<NUMMOBJTYPES; i++)
+         if (mobjinfo[i].doomednum != -1)
+         {
+            unsigned h = (unsigned) mobjinfo[i].doomednum % NUMMOBJTYPES;
+            hash[i].next = hash[h].first;
+            hash[h].first = i;
+         }
+   }
+
+   i = hash[type % NUMMOBJTYPES].first;
+   while ((i < NUMMOBJTYPES) && ((unsigned)mobjinfo[i].doomednum != type))
+      i = hash[i].next;
+   return i;
+}
+
+//
+// P_RespawnSpecials
+//
+
+void P_RespawnSpecials (void)
+{
+   fixed_t       x;
+   fixed_t       y;
+   fixed_t       z;
+   subsector_t*  ss;
+   mobj_t*       mo;
+   mapthing_t*   mthing;
+   int           i;
+
+   // only respawn items in deathmatch
+
+   if (deathmatch != 2)
+      return;
+
+   // nothing left to respawn?
+
+   if (iquehead == iquetail)
+      return;
+
+   // wait at least 30 seconds
+
+   if (leveltime - itemrespawntime[iquetail] < 30*35)
+      return;
+
+   mthing = &itemrespawnque[iquetail];
+
+   x = mthing->x << FRACBITS;
+   y = mthing->y << FRACBITS;
+
+   // spawn a teleport fog at the new spot
+
+   ss = R_PointInSubsector (x,y);
+   mo = P_SpawnMobj (x, y, ss->sector->floorheight , MT_IFOG);
+   S_StartSound (mo, sfx_itmbk);
+
+   // find which type to spawn
+
+   /* killough 8/23/98: use table for faster lookup */
+   i = P_FindDoomedNum(mthing->type);
+
+   // spawn it
+
+   if (mobjinfo[i].flags & MF_SPAWNCEILING)
+      z = ONCEILINGZ;
+   else
+      z = ONFLOORZ;
+
+   mo = P_SpawnMobj (x,y,z, i);
+   mo->spawnpoint = *mthing;
+   mo->angle = ANG45 * (mthing->angle/45);
+
+   // pull it from the queue
+
+   iquetail = (iquetail+1)&(ITEMQUESIZE-1);
+}
+
+//
+// P_SpawnPlayer
+// Called when a player is spawned on the level.
+// Most of the player structure stays unchanged
+//  between levels.
+//
+
+extern byte playernumtotrans[MAXPLAYERS];
+
+void P_SpawnPlayer (mapthing_t* mthing)
+{
+   player_t* p;
+   fixed_t   x;
+   fixed_t   y;
+   fixed_t   z;
+   mobj_t*   mobj;
+   int       i;
+
+   // not playing?
+
+   if (!playeringame[mthing->type-1])
+      return;
+
+   p = &players[mthing->type-1];
+
+   if (p->playerstate == PST_REBORN)
+      G_PlayerReborn (mthing->type-1);
+
+   x    = mthing->x << FRACBITS;
+   y    = mthing->y << FRACBITS;
+   z    = ONFLOORZ;
+   mobj = P_SpawnMobj (x,y,z, MT_PLAYER);
+
+   // set color translations for player sprites
+
+   if (mthing->type > 0)
+      mobj->flags |= playernumtotrans[mthing->type-1]<<MF_TRANSSHIFT;
+
+   mobj->angle      = ANG45 * (mthing->angle/45);
+   mobj->player     = p;
+   mobj->health     = p->health;
+
+   p->mo            = mobj;
+   p->playerstate   = PST_LIVE;
+   p->refire        = 0;
+   p->message       = NULL;
+   p->damagecount   = 0;
+   p->bonuscount    = 0;
+   p->extralight    = 0;
+   p->fixedcolormap = 0;
+   p->viewheight    = VIEWHEIGHT;
+
+   p->momx = p->momy = 0;   // killough 10/98: initialize bobbing to 0.
+
+   // setup gun psprite
+
+   P_SetupPsprites (p);
+
+   // give all cards in death match mode
+
+   if (deathmatch)
+      for (i = 0 ; i < NUMCARDS ; i++)
+         p->cards[i] = true;
+
+   if (mthing->type-1 == consoleplayer)
+   {
+      ST_Start(); // wake up the status bar
+      HU_Start(); // wake up the heads up text
+   }
+}
+
+
+//
+// P_SpawnMapThing
+// The fields of the mapthing should
+// already be in host byte order.
+//
+
+void P_SpawnMapThing (mapthing_t* mthing)
+{
+   int     i;
+   //int     bit;
+   mobj_t* mobj;
+   fixed_t x;
+   fixed_t y;
+   fixed_t z;
+
+   // killough 2/26/98: Ignore type-0 things as NOPs
+   // phares 5/14/98: Ignore Player 5-8 starts (for now)
+
+   switch(mthing->type)
+   {
+   case 0:
+   case DEN_PLAYER5:
+   case DEN_PLAYER6:
+   case DEN_PLAYER7:
+   case DEN_PLAYER8:
+      return;
+   }
+
+   // killough 11/98: clear flags unused by Doom
+   //
+   // We clear the flags unused in Doom if we see flag mask 256 set, since
+   // it is reserved to be 0 under the new scheme. A 1 in this reserved bit
+   // indicates it's a Doom wad made by a Doom editor which puts 1's in
+   // bits that weren't used in Doom (such as HellMaker wads). So we should
+   // then simply ignore all upper bits.
+
+   if (demo_compatibility ||
+         (compatibility_level >= lxdoom_1_compatibility  &&
+          mthing->options & MTF_RESERVED)) {
+      if (!demo_compatibility) // cph - Add warning about bad thing flags
+         printf("P_SpawnMapThing: correcting bad flags (%u) (thing type %d)\n",
+                 mthing->options, mthing->type);
+      mthing->options &= MTF_EASY|MTF_NORMAL|MTF_HARD|MTF_AMBUSH|MTF_NOTSINGLE;
+   }
+
+   // count deathmatch start positions
+
+   // doom2.exe has at most 10 deathmatch starts
+   if (mthing->type == 11 && (!compatibility || deathmatch_p-deathmatchstarts < 10))
+   {
+      // 1/11/98 killough -- new code removes limit on deathmatch starts:
+
+      size_t offset = deathmatch_p - deathmatchstarts;
+
+      if (offset >= num_deathmatchstarts)
+      {
+         num_deathmatchstarts = num_deathmatchstarts ?
+                                num_deathmatchstarts*2 : 16;
+         deathmatchstarts = realloc(deathmatchstarts,
+                                    num_deathmatchstarts *
+                                    sizeof(*deathmatchstarts));
+         deathmatch_p = deathmatchstarts + offset;
+      }
+      memcpy(deathmatch_p++, mthing, sizeof(*mthing));
+      return;
+   }
+
+   // check for players specially
+
+   if (mthing->type <= 4 && mthing->type > 0)  // killough 2/26/98 -- fix crashes
+   {
+#ifdef DOGS
+      // killough 7/19/98: Marine's best friend :)
+      if (!netgame && mthing->type > 1 && mthing->type <= dogs+1 &&
+            !players[mthing->type-1].secretcount)
+      {  // use secretcount to avoid multiple dogs in case of multiple starts
+         players[mthing->type-1].secretcount = 1;
+
+         // killough 10/98: force it to be a friend
+         mthing->options |= MTF_FRIEND;
+         i = MT_DOGS;
+         goto spawnit;
+      }
+#endif
+
+
+      // save spots for respawning in network games
+
+      playerstarts[mthing->type-1] = *mthing;
+      if (!deathmatch)
+         P_SpawnPlayer (mthing);
+      return;
+   }
+
+   // check for apropriate skill level
+
+   /* jff "not single" thing flag */
+   if (!netgame && mthing->options & MTF_NOTSINGLE)
+      return;
+
+   //jff 3/30/98 implement "not deathmatch" thing flag
+
+   if (netgame && deathmatch && mthing->options & MTF_NOTDM)
+      return;
+
+   //jff 3/30/98 implement "not cooperative" thing flag
+
+   if (netgame && !deathmatch && mthing->options & MTF_NOTCOOP)
+      return;
+
+   // killough 11/98: simplify
+   if (gameskill == sk_baby || gameskill == sk_easy ?
+         !(mthing->options & MTF_EASY) :
+         gameskill == sk_hard || gameskill == sk_nightmare ?
+         !(mthing->options & MTF_HARD) : !(mthing->options & MTF_NORMAL))
+      return;
+
+   // find which type to spawn
+
+   // killough 8/23/98: use table for faster lookup
+   i = P_FindDoomedNum(mthing->type);
+
+   // phares 5/16/98:
+   // Do not abort because of an unknown thing. Ignore it, but post a
+   // warning message for the player.
+
+   if (i == NUMMOBJTYPES)
+   {
+      doom_printf("Unknown Thing type %i at (%i, %i)",mthing->type,mthing->x,mthing->y);
+      return;
+   }
+
+   // don't spawn keycards and players in deathmatch
+
+   if (deathmatch && mobjinfo[i].flags & MF_NOTDMATCH)
+      return;
+
+   // don't spawn any monsters if -nomonsters
+
+   if (nomonsters && (i == MT_SKULL || (mobjinfo[i].flags & MF_COUNTKILL)))
+      return;
+
+   // spawn it
+#ifdef DOGS
+spawnit:
+#endif
+
+   x = mthing->x << FRACBITS;
+   y = mthing->y << FRACBITS;
+
+   if (mobjinfo[i].flags & MF_SPAWNCEILING)
+      z = ONCEILINGZ;
+   else
+      z = ONFLOORZ;
+
+   mobj = P_SpawnMobj (x,y,z, i);
+   mobj->spawnpoint = *mthing;
+
+   if (mobj->tics > 0)
+      mobj->tics = 1 + (P_Random (pr_spawnthing) % mobj->tics);
+
+   if (!(mobj->flags & MF_FRIEND) &&
+         mthing->options & MTF_FRIEND &&
+         mbf_features)
+   {
+      mobj->flags |= MF_FRIEND;            // killough 10/98:
+      P_UpdateThinker(&mobj->thinker);     // transfer friendliness flag
+   }
+
+   /* killough 7/20/98: exclude friends */
+   if (!((mobj->flags ^ MF_COUNTKILL) & (MF_FRIEND | MF_COUNTKILL)))
+      totalkills++;
+
+   if (mobj->flags & MF_COUNTITEM)
+      totalitems++;
+
+   mobj->angle = ANG45 * (mthing->angle/45);
+   if (mthing->options & MTF_AMBUSH)
+      mobj->flags |= MF_AMBUSH;
+}
+
+
+//
+// GAME SPAWN FUNCTIONS
+//
+
+//
+// P_SpawnPuff
+//
+
+extern fixed_t attackrange;
+
+void P_SpawnPuff(fixed_t x,fixed_t y,fixed_t z)
+{
+   mobj_t* th;
+   // killough 5/5/98: remove dependence on order of evaluation:
+   int t = P_Random(pr_spawnpuff);
+   z += (t - P_Random(pr_spawnpuff))<<10;
+
+   th = P_SpawnMobj (x,y,z, MT_PUFF);
+   th->momz = FRACUNIT;
+   th->tics -= P_Random(pr_spawnpuff)&3;
+
+   if (th->tics < 1)
+      th->tics = 1;
+
+   // don't make punches spark on the wall
+
+   if (attackrange == MELEERANGE)
+      P_SetMobjState (th, S_PUFF3);
+}
+
+
+//
+// P_SpawnBlood
+//
+void P_SpawnBlood(fixed_t x,fixed_t y,fixed_t z,int damage)
+{
+   mobj_t* th;
+   // killough 5/5/98: remove dependence on order of evaluation:
+   int t = P_Random(pr_spawnblood);
+   z += (t - P_Random(pr_spawnblood))<<10;
+   th = P_SpawnMobj(x,y,z, MT_BLOOD);
+   th->momz = FRACUNIT*2;
+   th->tics -= P_Random(pr_spawnblood)&3;
+
+   if (th->tics < 1)
+      th->tics = 1;
+
+   if (damage <= 12 && damage >= 9)
+      P_SetMobjState (th,S_BLOOD2);
+   else if (damage < 9)
+      P_SetMobjState (th,S_BLOOD3);
+}
+
+
+//
+// P_CheckMissileSpawn
+// Moves the missile forward a bit
+//  and possibly explodes it right there.
+//
+
+void P_CheckMissileSpawn (mobj_t* th)
+{
+   th->tics -= P_Random(pr_missile)&3;
+   if (th->tics < 1)
+      th->tics = 1;
+
+   // move a little forward so an angle can
+   // be computed if it immediately explodes
+
+   th->x += (th->momx>>1);
+   th->y += (th->momy>>1);
+   th->z += (th->momz>>1);
+
+   // killough 8/12/98: for non-missile objects (e.g. grenades)
+   if (!(th->flags & MF_MISSILE) && mbf_features)
+      return;
+
+   // killough 3/15/98: no dropoff (really = don't care for missiles)
+
+   if (!P_TryMove (th, th->x, th->y, false))
+      P_ExplodeMissile (th);
+}
+
+
+//
+// P_SpawnMissile
+//
+
+mobj_t* P_SpawnMissile(mobj_t* source,mobj_t* dest,mobjtype_t type)
+{
+   mobj_t* th;
+   angle_t an;
+   int     dist;
+
+   th = P_SpawnMobj (source->x,source->y,source->z + 4*8*FRACUNIT,type);
+
+   if (th->info->seesound)
+      S_StartSound (th, th->info->seesound);
+
+   P_SetTarget(&th->target, source);    // where it came from
+   an = R_PointToAngle2 (source->x, source->y, dest->x, dest->y);
+
+   // fuzzy player
+
+   if (dest->flags & MF_SHADOW)
+   {  // killough 5/5/98: remove dependence on order of evaluation:
+      int t = P_Random(pr_shadow);
+      an += (t - P_Random(pr_shadow))<<20;
+   }
+
+   th->angle = an;
+   an >>= ANGLETOFINESHIFT;
+   th->momx = FixedMul (th->info->speed, finecosine[an]);
+   th->momy = FixedMul (th->info->speed, finesine[an]);
+
+   dist = P_AproxDistance (dest->x - source->x, dest->y - source->y);
+   dist = dist / th->info->speed;
+
+   if (dist < 1)
+      dist = 1;
+
+   th->momz = (dest->z - source->z) / dist;
+   P_CheckMissileSpawn (th);
+
+   return th;
+}
+
+
+//
+// P_SpawnPlayerMissile
+// Tries to aim at a nearby monster
+//
+
+void P_SpawnPlayerMissile(mobj_t* source,mobjtype_t type)
+{
+   mobj_t *th;
+   fixed_t x, y, z, slope = 0;
+
+   // see which target is to be aimed at
+
+   angle_t an = source->angle;
+
+   // killough 7/19/98: autoaiming was not in original beta
+   {
+      // killough 8/2/98: prefer autoaiming at enemies
+      uint_64_t mask = mbf_features ? MF_FRIEND : 0;
+
+      do
+      {
+         slope = P_AimLineAttack(source, an, 16*64*FRACUNIT, mask);
+         if (!linetarget)
+            slope = P_AimLineAttack(source, an += 1<<26, 16*64*FRACUNIT, mask);
+         if (!linetarget)
+            slope = P_AimLineAttack(source, an -= 2<<26, 16*64*FRACUNIT, mask);
+         if (!linetarget)
+            an = source->angle, slope = 0;
+      }
+      while (mask && (mask=0, !linetarget));  // killough 8/2/98
+   }
+
+   x = source->x;
+   y = source->y;
+   z = source->z + 4*8*FRACUNIT;
+
+   th = P_SpawnMobj (x,y,z, type);
+
+   if (th->info->seesound)
+      S_StartSound (th, th->info->seesound);
+
+   P_SetTarget(&th->target, source);
+   th->angle = an;
+   th->momx = FixedMul(th->info->speed,finecosine[an>>ANGLETOFINESHIFT]);
+   th->momy = FixedMul(th->info->speed,finesine[an>>ANGLETOFINESHIFT]);
+   th->momz = FixedMul(th->info->speed,slope);
+
+   P_CheckMissileSpawn(th);
+}