// Emacs style mode select   -*- C++ -*- 
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// $Log:$
//
// DESCRIPTION:
//	Archiving: SaveGame I/O.
//	Thinker, Ticker.
//
//-----------------------------------------------------------------------------

static const char
rcsid[] = "$Id: p_tick.c,v 1.4 1997/02/03 16:47:55 b1 Exp $";

#include "z_zone.h"
#include "p_local.h"

#include "doomstat.h"


int	leveltime;

//
// 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.
//



// Both the head and tail of the thinker list.
thinker_t	thinkercap;


//
// 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)
{
  // FIXME: NOP.
  thinker->function.acv = (actionf_v)(-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.acv == (actionf_v)(-1) )
	{
	    // time to remove it
	    currentthinker->next->prev = currentthinker->prev;
	    currentthinker->prev->next = currentthinker->next;
	    Z_Free (currentthinker);
	}
	else
	{
	    if (currentthinker->function.acp1)
		currentthinker->function.acp1 (currentthinker);
	}
	currentthinker = currentthinker->next;
    }
}



//
// P_Ticker
//

void P_Ticker (void)
{
    int		i;
    
    // run the tic
    if (paused)
	return;
		
    // pause if in menu and at least one tic has been run
    if ( !netgame
	 && menuactive
	 && !demoplayback
	 && players[consoleplayer].viewz != 1)
    {
	return;
    }
    
		
    for (i=0 ; i<MAXPLAYERS ; i++)
	if (playeringame[i])
	    P_PlayerThink (&players[i]);
			
    P_RunThinkers ();
    P_UpdateSpecials ();
    P_RespawnSpecials ();

    // for par times
    leveltime++;	
}