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diff --git a/src/doom/p_ceilng.c b/src/doom/p_ceilng.c
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+// Emacs style mode select -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 1993-1996 Id Software, Inc.
+// Copyright(C) 2005 Simon Howard
+//
+// 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: Ceiling aninmation (lowering, crushing, raising)
+//
+//-----------------------------------------------------------------------------
+
+
+
+#include "z_zone.h"
+#include "doomdef.h"
+#include "p_local.h"
+
+#include "s_sound.h"
+
+// State.
+#include "doomstat.h"
+#include "r_state.h"
+
+// Data.
+#include "sounds.h"
+
+//
+// CEILINGS
+//
+
+
+ceiling_t* activeceilings[MAXCEILINGS];
+
+
+//
+// T_MoveCeiling
+//
+
+void T_MoveCeiling (ceiling_t* ceiling)
+{
+ result_e res;
+
+ switch(ceiling->direction)
+ {
+ case 0:
+ // IN STASIS
+ break;
+ case 1:
+ // UP
+ res = T_MovePlane(ceiling->sector,
+ ceiling->speed,
+ ceiling->topheight,
+ false,1,ceiling->direction);
+
+ if (!(leveltime&7))
+ {
+ switch(ceiling->type)
+ {
+ case silentCrushAndRaise:
+ break;
+ default:
+ S_StartSound(&ceiling->sector->soundorg, sfx_stnmov);
+ // ?
+ break;
+ }
+ }
+
+ if (res == pastdest)
+ {
+ switch(ceiling->type)
+ {
+ case raiseToHighest:
+ P_RemoveActiveCeiling(ceiling);
+ break;
+
+ case silentCrushAndRaise:
+ S_StartSound(&ceiling->sector->soundorg, sfx_pstop);
+ case fastCrushAndRaise:
+ case crushAndRaise:
+ ceiling->direction = -1;
+ break;
+
+ default:
+ break;
+ }
+
+ }
+ break;
+
+ case -1:
+ // DOWN
+ res = T_MovePlane(ceiling->sector,
+ ceiling->speed,
+ ceiling->bottomheight,
+ ceiling->crush,1,ceiling->direction);
+
+ if (!(leveltime&7))
+ {
+ switch(ceiling->type)
+ {
+ case silentCrushAndRaise: break;
+ default:
+ S_StartSound(&ceiling->sector->soundorg, sfx_stnmov);
+ }
+ }
+
+ if (res == pastdest)
+ {
+ switch(ceiling->type)
+ {
+ case silentCrushAndRaise:
+ S_StartSound(&ceiling->sector->soundorg, sfx_pstop);
+ case crushAndRaise:
+ ceiling->speed = CEILSPEED;
+ case fastCrushAndRaise:
+ ceiling->direction = 1;
+ break;
+
+ case lowerAndCrush:
+ case lowerToFloor:
+ P_RemoveActiveCeiling(ceiling);
+ break;
+
+ default:
+ break;
+ }
+ }
+ else // ( res != pastdest )
+ {
+ if (res == crushed)
+ {
+ switch(ceiling->type)
+ {
+ case silentCrushAndRaise:
+ case crushAndRaise:
+ case lowerAndCrush:
+ ceiling->speed = CEILSPEED / 8;
+ break;
+
+ default:
+ break;
+ }
+ }
+ }
+ break;
+ }
+}
+
+
+//
+// EV_DoCeiling
+// Move a ceiling up/down and all around!
+//
+int
+EV_DoCeiling
+( line_t* line,
+ ceiling_e type )
+{
+ int secnum;
+ int rtn;
+ sector_t* sec;
+ ceiling_t* ceiling;
+
+ secnum = -1;
+ rtn = 0;
+
+ // Reactivate in-stasis ceilings...for certain types.
+ switch(type)
+ {
+ case fastCrushAndRaise:
+ case silentCrushAndRaise:
+ case crushAndRaise:
+ P_ActivateInStasisCeiling(line);
+ default:
+ break;
+ }
+
+ while ((secnum = P_FindSectorFromLineTag(line,secnum)) >= 0)
+ {
+ sec = &sectors[secnum];
+ if (sec->specialdata)
+ continue;
+
+ // new door thinker
+ rtn = 1;
+ ceiling = Z_Malloc (sizeof(*ceiling), PU_LEVSPEC, 0);
+ P_AddThinker (&ceiling->thinker);
+ sec->specialdata = ceiling;
+ ceiling->thinker.function.acp1 = (actionf_p1)T_MoveCeiling;
+ ceiling->sector = sec;
+ ceiling->crush = false;
+
+ switch(type)
+ {
+ case fastCrushAndRaise:
+ ceiling->crush = true;
+ ceiling->topheight = sec->ceilingheight;
+ ceiling->bottomheight = sec->floorheight + (8*FRACUNIT);
+ ceiling->direction = -1;
+ ceiling->speed = CEILSPEED * 2;
+ break;
+
+ case silentCrushAndRaise:
+ case crushAndRaise:
+ ceiling->crush = true;
+ ceiling->topheight = sec->ceilingheight;
+ case lowerAndCrush:
+ case lowerToFloor:
+ ceiling->bottomheight = sec->floorheight;
+ if (type != lowerToFloor)
+ ceiling->bottomheight += 8*FRACUNIT;
+ ceiling->direction = -1;
+ ceiling->speed = CEILSPEED;
+ break;
+
+ case raiseToHighest:
+ ceiling->topheight = P_FindHighestCeilingSurrounding(sec);
+ ceiling->direction = 1;
+ ceiling->speed = CEILSPEED;
+ break;
+ }
+
+ ceiling->tag = sec->tag;
+ ceiling->type = type;
+ P_AddActiveCeiling(ceiling);
+ }
+ return rtn;
+}
+
+
+//
+// Add an active ceiling
+//
+void P_AddActiveCeiling(ceiling_t* c)
+{
+ int i;
+
+ for (i = 0; i < MAXCEILINGS;i++)
+ {
+ if (activeceilings[i] == NULL)
+ {
+ activeceilings[i] = c;
+ return;
+ }
+ }
+}
+
+
+
+//
+// Remove a ceiling's thinker
+//
+void P_RemoveActiveCeiling(ceiling_t* c)
+{
+ int i;
+
+ for (i = 0;i < MAXCEILINGS;i++)
+ {
+ if (activeceilings[i] == c)
+ {
+ activeceilings[i]->sector->specialdata = NULL;
+ P_RemoveThinker (&activeceilings[i]->thinker);
+ activeceilings[i] = NULL;
+ break;
+ }
+ }
+}
+
+
+
+//
+// Restart a ceiling that's in-stasis
+//
+void P_ActivateInStasisCeiling(line_t* line)
+{
+ int i;
+
+ for (i = 0;i < MAXCEILINGS;i++)
+ {
+ if (activeceilings[i]
+ && (activeceilings[i]->tag == line->tag)
+ && (activeceilings[i]->direction == 0))
+ {
+ activeceilings[i]->direction = activeceilings[i]->olddirection;
+ activeceilings[i]->thinker.function.acp1
+ = (actionf_p1)T_MoveCeiling;
+ }
+ }
+}
+
+
+
+//
+// EV_CeilingCrushStop
+// Stop a ceiling from crushing!
+//
+int EV_CeilingCrushStop(line_t *line)
+{
+ int i;
+ int rtn;
+
+ rtn = 0;
+ for (i = 0;i < MAXCEILINGS;i++)
+ {
+ if (activeceilings[i]
+ && (activeceilings[i]->tag == line->tag)
+ && (activeceilings[i]->direction != 0))
+ {
+ activeceilings[i]->olddirection = activeceilings[i]->direction;
+ activeceilings[i]->thinker.function.acv = (actionf_v)NULL;
+ activeceilings[i]->direction = 0; // in-stasis
+ rtn = 1;
+ }
+ }
+
+
+ return rtn;
+}