/*+
−
	SDL - Simple DirectMedia Layer+
−
    Copyright (C) 1997-2004 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@libsdl.org+
−
*/+
−
+
−
#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 (&microsecs);+
−
	+
−
	stop = microsecs.lo + (ms * 1000);+
−
	+
−
	while ( stop > microsecs.lo ) {+
−
	+
−
	   SystemTask ();+
−
	   +
−
	   Microseconds (&microsecs);+
−
	}+
−
+
−
}*/+
−
 +
−
/* 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);+
−
}+
−