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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
* Handles timers.
*
* Note: As part of the transition to ScummVM, the ticks field of a timer has been changed
* to a millisecond value, rather than ticks at 24Hz. Most places should be able to use
* the timers without change, since the ONE_SECOND constant has been set to be in MILLISECONDS
*/
#include "tinsel/timers.h"
#include "tinsel/dw.h"
#include "tinsel/serializer.h"
#include "common/system.h"
namespace Tinsel {
//----------------- LOCAL DEFINES --------------------
#define MAX_TIMERS 16
struct TIMER {
int tno; /**< Timer number */
int ticks; /**< Tick count */
int secs; /**< Second count */
int delta; /**< Increment/decrement value */
bool frame; /**< If set, in ticks, otherwise in seconds */
};
//----------------- LOCAL GLOBAL DATA --------------------
static TIMER timers[MAX_TIMERS];
//--------------------------------------------------------
/**
* Gets the current time in number of ticks.
*
* DOS timer ticks is the number of 54.9254ms since midnight. Converting the
* millisecond count won't give the exact same 'since midnight' count, but I
* figure that as long as the timing interval is more or less accurate, it
* shouldn't be a problem.
*/
uint32 DwGetCurrentTime() {
return g_system->getMillis() * 55 / 1000;
}
/**
* Resets all of the timer slots
*/
void RebootTimers(void) {
memset(timers, 0, sizeof(timers));
}
/**
* (Un)serialize the timer data for save/restore game.
*/
void syncTimerInfo(Serializer &s) {
for (int i = 0; i < MAX_TIMERS; i++) {
s.syncAsSint32LE(timers[i].tno);
s.syncAsSint32LE(timers[i].ticks);
s.syncAsSint32LE(timers[i].secs);
s.syncAsSint32LE(timers[i].delta);
s.syncAsSint32LE(timers[i].frame);
}
}
/**
* Find the timer numbered thus, if one is thus numbered.
* @param num number of the timer
* @return the timer with the specified number, or NULL if there is none
*/
static TIMER *findTimer(int num) {
for (int i = 0; i < MAX_TIMERS; i++) {
if (timers[i].tno == num)
return &timers[i];
}
return NULL;
}
/**
* Find an empty timer slot.
*/
static TIMER *allocateTimer(int num) {
assert(num); // zero is not allowed as a timer number
assert(!findTimer(num)); // Allocating already existant timer
for (int i = 0; i < MAX_TIMERS; i++) {
if (!timers[i].tno) {
timers[i].tno = num;
return &timers[i];
}
}
error("Too many timers");
}
/**
* Update all timers, as appropriate.
*/
void FettleTimers(void) {
for (int i = 0; i < MAX_TIMERS; i++) {
if (!timers[i].tno)
continue;
timers[i].ticks += timers[i].delta; // Update tick value
if (timers[i].frame) {
if (timers[i].ticks < 0)
timers[i].ticks = 0; // Have reached zero
} else {
if (timers[i].ticks < 0) {
timers[i].ticks = ONE_SECOND;
timers[i].secs--;
if (timers[i].secs < 0)
timers[i].secs = 0; // Have reached zero
} else if (timers[i].ticks == ONE_SECOND) {
timers[i].ticks = 0;
timers[i].secs++; // Another second has passed
}
}
}
}
/**
* Start a timer up.
*/
void StartTimer(int num, int sval, bool up, bool frame) {
TIMER *pt;
assert(num); // zero is not allowed as a timer number
pt = findTimer(num);
if (pt == NULL)
pt = allocateTimer(num);
pt->delta = up ? 1 : -1; // Increment/decrement value
pt->frame = frame;
if (frame) {
pt->secs = 0;
pt->ticks = sval;
} else {
pt->secs = sval;
pt->ticks = 0;
}
}
/**
* Return the current count of a timer.
*/
int Timer(int num) {
TIMER *pt;
pt = findTimer(num);
if (pt == NULL)
return -1;
if (pt->frame)
return pt->ticks;
else
return pt->secs;
}
} // end of namespace Tinsel
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