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SDL_systimer.c
146 lines (111 loc) · 2.82 KB
/
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 <stdio.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "SDL_error.h"
#include "SDL_timer.h"
#include "SDL_timer_c.h"
/* Timer start/reset time */
static Uint32 timerStart;
/* Timer running function */
void RISCOS_CheckTimer();
extern void RISCOS_BackgroundTasks(void);
/* The first ticks value of the application */
clock_t start;
void SDL_StartTicks(void)
{
/* Set first ticks value */
start = clock();
}
Uint32 SDL_GetTicks (void)
{
clock_t ticks;
ticks=clock()-start;
#if CLOCKS_PER_SEC == 1000
return(ticks);
#elif CLOCKS_PER_SEC == 100
return (ticks * 10);
#else
return ticks*(1000/CLOCKS_PER_SEC);
#endif
}
extern void DRenderer_FillBuffers();
void SDL_Delay (Uint32 ms)
{
Uint32 now,then,elapsed;
/* Set the timeout interval - Linux only needs to do this once */
then = SDL_GetTicks();
do {
/* Do background tasks required while sleeping as we are not multithreaded */
RISCOS_BackgroundTasks();
/* Calculate the time interval left (in case of interrupt) */
now = SDL_GetTicks();
elapsed = (now-then);
then = now;
if ( elapsed >= ms ) {
break;
}
ms -= elapsed;
} while ( 1 );
}
int SDL_SYS_TimerInit(void)
{
return(0);
}
void SDL_SYS_TimerQuit(void)
{
SDL_SetTimer(0, NULL);
}
int SDL_SYS_StartTimer(void)
{
timerStart = SDL_GetTicks();
return(0);
}
void SDL_SYS_StopTimer(void)
{
/* Don't need to do anything as we use SDL_timer_running
to detect if we need to check the timer */
}
void RISCOS_CheckTimer()
{
if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval)
{
Uint32 ms;
ms = SDL_alarm_callback(SDL_alarm_interval);
if ( ms != SDL_alarm_interval )
{
if ( ms )
{
SDL_alarm_interval = ROUND_RESOLUTION(ms);
} else
{
SDL_alarm_interval = 0;
SDL_timer_running = 0;
}
}
if (SDL_alarm_interval) timerStart = SDL_GetTicks();
}
}