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+// Emacs style mode select -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 1993-1996 Id Software, Inc.
+// Copyright(C) 1993-2008 Raven Software
+// Copyright(C) 2008 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.
+//
+//-----------------------------------------------------------------------------
+
+// P_tick.c
+
+#include "doomdef.h"
+#include "i_system.h"
+#include "p_local.h"
+#include "v_video.h"
+
+int leveltime;
+int TimerGame;
+
+/*
+===============================================================================
+
+ THINKERS
+
+All thinkers should be allocated by Z_Malloc so they can be operated on uniformly. The actual
+structures will vary in size, but the first element must be thinker_t.
+
+===============================================================================
+*/
+
+thinker_t thinkercap; // both the head and tail of the thinker list
+
+/*
+===============
+=
+= P_InitThinkers
+=
+===============
+*/
+
+void P_InitThinkers(void)
+{
+ thinkercap.prev = thinkercap.next = &thinkercap;
+}
+
+
+/*
+===============
+=
+= P_AddThinker
+=
+= Adds a new thinker at the end of the list
+=
+===============
+*/
+
+void P_AddThinker(thinker_t * thinker)
+{
+ thinkercap.prev->next = thinker;
+ thinker->next = &thinkercap;
+ thinker->prev = thinkercap.prev;
+ thinkercap.prev = thinker;
+}
+
+/*
+===============
+=
+= P_RemoveThinker
+=
+= Deallocation is lazy -- it will not actually be freed until its
+= thinking turn comes up
+=
+===============
+*/
+
+void P_RemoveThinker(thinker_t * thinker)
+{
+ thinker->function = (think_t) - 1;
+}
+
+/*
+===============
+=
+= P_AllocateThinker
+=
+= Allocates memory and adds a new thinker at the end of the list
+=
+===============
+*/
+
+void P_AllocateThinker(thinker_t * thinker)
+{
+}
+
+
+/*
+===============
+=
+= P_RunThinkers
+=
+===============
+*/
+
+void P_RunThinkers(void)
+{
+ thinker_t *currentthinker;
+
+ currentthinker = thinkercap.next;
+ while (currentthinker != &thinkercap)
+ {
+ if (currentthinker->function == (think_t) - 1)
+ { // time to remove it
+ currentthinker->next->prev = currentthinker->prev;
+ currentthinker->prev->next = currentthinker->next;
+ Z_Free(currentthinker);
+ }
+ else
+ {
+ if (currentthinker->function)
+ currentthinker->function(currentthinker);
+ }
+ currentthinker = currentthinker->next;
+ }
+}
+
+//----------------------------------------------------------------------------
+//
+// PROC P_Ticker
+//
+//----------------------------------------------------------------------------
+
+void P_Ticker(void)
+{
+ int i;
+
+ if (paused)
+ {
+ return;
+ }
+ for (i = 0; i < MAXPLAYERS; i++)
+ {
+ if (playeringame[i])
+ {
+ P_PlayerThink(&players[i]);
+ }
+ }
+ if (TimerGame)
+ {
+ if (!--TimerGame)
+ {
+ G_ExitLevel();
+ }
+ }
+ P_RunThinkers();
+ P_UpdateSpecials();
+ P_AmbientSound();
+ leveltime++;
+}