shithub: heretic

ref: 064398f0c16f776f858526a5eed00c35fbf46f4b
dir: /p_tick.c/

// P_tick.c

// HEADER FILES ------------------------------------------------------------

#include "h2stdinc.h"
#include "doomdef.h"
#include "p_local.h"

// MACROS ------------------------------------------------------------------

// TYPES -------------------------------------------------------------------

// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------

// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------

// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------

static void P_RunThinkers (void);

// EXTERNAL DATA DECLARATIONS ----------------------------------------------

// PUBLIC DATA DEFINITIONS -------------------------------------------------

int leveltime;
int TimerGame;
thinker_t thinkercap;	/* both the head and tail of the thinker list */

// PRIVATE DATA DEFINITIONS ------------------------------------------------

// CODE --------------------------------------------------------------------


//==========================================================================
//
// 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.
//
//==========================================================================


//==========================================================================
//
// 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++;
}

//==========================================================================
//
// P_RunThinkers
//
//==========================================================================

static 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;
	}
}

//==========================================================================
//
// 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;
}