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SDL_systimer.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@devolution.com
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
#include <Types.h>
#include <Timer.h>
#include <OSUtils.h>
#include <Gestalt.h>
#include <Processes.h>
#include <LowMem.h>
#include "SDL_timer.h"
#include "SDL_timer_c.h"
#include "FastTimes.h"
#define MS_PER_TICK (1000.0/60.0) /* MacOS tick = 1/60 second */
#define kTwoPower32 (4294967296.0) /* 2^32 */
static double start_tick;
static int is_fast_inited = 0;
void SDL_StartTicks(void)
{
if ( ! is_fast_inited ) // important to check or FastTime may hang machine!
SDL_SYS_TimerInit();
start_tick = FastMicroseconds();
}
Uint32 SDL_GetTicks(void)
{
if ( ! is_fast_inited )
SDL_SYS_TimerInit();
return FastMilliseconds();
}
void SDL_Delay(Uint32 ms)
{
Uint32 stop, now;
stop = SDL_GetTicks() + ms;
do {
SystemTask();
now = SDL_GetTicks();
} while ( stop > now );
}
/*
void SDL_StartTicks(void)
{
// FIXME: Should we implement a wrapping algorithm, like Win32?
}
Uint32 SDL_GetTicks(void)
{
UnsignedWide ms;
Microseconds (&ms);
return ( ms.lo / 1000 );
}
void SDL_Delay(Uint32 ms)
{
UnsignedWide microsecs;
UInt32 stop;
Microseconds (µsecs);
stop = microsecs.lo + (ms * 1000);
while ( stop > microsecs.lo ) {
SystemTask ();
Microseconds (µsecs);
}
}*/
/* Data to handle a single periodic alarm */
typedef struct _ExtendedTimerRec
{
TMTask tmTask;
ProcessSerialNumber taskPSN;
} ExtendedTimerRec, *ExtendedTimerPtr;
static ExtendedTimerRec gExtendedTimerRec;
int SDL_SYS_TimerInit(void)
{
FastInitialize ();
is_fast_inited = 1;
return(0);
}
void SDL_SYS_TimerQuit(void)
{
/* We don't need a cleanup? */
return;
}
/* Our Stub routine to set up and then call the real routine. */
pascal void TimerCallbackProc(TMTaskPtr tmTaskPtr)
{
Uint32 ms;
WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN);
ms = SDL_alarm_callback(SDL_alarm_interval);
if ( ms ) {
SDL_alarm_interval = ROUND_RESOLUTION(ms);
PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask,
SDL_alarm_interval);
} else {
SDL_alarm_interval = 0;
}
}
int SDL_SYS_StartTimer(void)
{
/*
* Configure the global structure that stores the timing information.
*/
gExtendedTimerRec.tmTask.qLink = NULL;
gExtendedTimerRec.tmTask.qType = 0;
gExtendedTimerRec.tmTask.tmAddr = NewTimerProc(TimerCallbackProc);
gExtendedTimerRec.tmTask.tmCount = 0;
gExtendedTimerRec.tmTask.tmWakeUp = 0;
gExtendedTimerRec.tmTask.tmReserved = 0;
GetCurrentProcess(&gExtendedTimerRec.taskPSN);
/* Install the task record */
InsXTime((QElemPtr)&gExtendedTimerRec.tmTask);
/* Go! */
PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, SDL_alarm_interval);
return(0);
}
void SDL_SYS_StopTimer(void)
{
RmvTime((QElemPtr)&gExtendedTimerRec.tmTask);
}