view src/timer/riscos/SDL_systimer.c @ 1012:f14e3059e138

Date: Mon, 13 Dec 2004 21:28:18 -0500 From: Jonathan Atkins Subject: [SDL] SDL_SaveBMP width bugfix this fixes the pitch versus width difference that can happen (especially for 8bit and 24bit (with the exact RGBAmasks) surfaces) when you use SDL_SaveBMP. The problem was the pitch was used instead of the width, which in some cases is much wider than the screen area you really want to save...making for ugly crud on the saved image borders. This code has been tested with & without pitch overhangs...and with the right masks for 24 bit surfaces. I tested 8,15,16,24,32-0RGB,32-RGBA(with no SDL_SRCALPHA flag).
author Sam Lantinga <slouken@libsdl.org>
date Tue, 14 Dec 2004 06:20:49 +0000
parents d74fbf56f2f6
children 974ba6ae0fa3
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/*
    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@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"

#ifdef DISABLE_THREADS
/* Timer start/reset time */
static Uint32 timerStart;
/* Timer running function */
void RISCOS_CheckTimer();
#else
#include <pthread.h>
extern Uint32 riscos_main_thread;
extern int riscos_using_threads;
extern Uint32 SDL_ThreadID();
extern Uint32 SDL_EventThreadID(void);
#endif


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

}

void SDL_Delay (Uint32 ms)
{
    Uint32 now,then,elapsed;
#ifndef DISABLE_THREADS
    int is_event_thread;
    if (riscos_using_threads)
    {
       is_event_thread = 0;
       if (SDL_EventThreadID())
       {
          if (SDL_EventThreadID() == SDL_ThreadID()) is_event_thread = 1;
       } else if (SDL_ThreadID() == riscos_main_thread) is_event_thread = 1;
    } else is_event_thread = 1;
#endif

/*TODO: Next version of unixlib may allow us to use usleep here */
/*      for non event threads */

	/* 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 */
#ifdef DISABLE_THREADS
		RISCOS_BackgroundTasks();
#else
		/* For threaded build only run background tasks in event thread */
		if (is_event_thread) RISCOS_BackgroundTasks();
#endif

		/* Calculate the time interval left (in case of interrupt) */
		now = SDL_GetTicks();
		elapsed = (now-then);
		then = now;
		if ( elapsed >= ms ) {
			break;
		}
		ms -= elapsed;
#ifndef DISABLE_THREADS
            /* Need to yield to let other threads have a go */
            if (riscos_using_threads) pthread_yield();
#endif

	} while ( 1 );
}

#ifdef DISABLE_THREADS

/* Non-threaded version of timer */

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();
	}
}

#else

/* Threaded version of timer - based on code for linux */

#include "SDL_thread.h"

/* Data to handle a single periodic alarm */
static int timer_alive = 0;
static SDL_Thread *timer = NULL;

static int RunTimer(void *unused)
{
	while ( timer_alive ) {
		if ( SDL_timer_running ) {
			SDL_ThreadedTimerCheck();
		}
		SDL_Delay(1);
	}
	return(0);
}

/* This is only called if the event thread is not running */
int SDL_SYS_TimerInit(void)
{
	timer_alive = 1;
	timer = SDL_CreateThread(RunTimer, NULL);
	if ( timer == NULL )
		return(-1);
	return(SDL_SetTimerThreaded(1));
}

void SDL_SYS_TimerQuit(void)
{
	timer_alive = 0;
	if ( timer ) {
		SDL_WaitThread(timer, NULL);
		timer = NULL;
	}
}

int SDL_SYS_StartTimer(void)
{
	SDL_SetError("Internal logic error: RISCOS uses threaded timer");
	return(-1);
}

void SDL_SYS_StopTimer(void)
{
	return;
}

#endif /* DISABLE_THREADS */