view src/timer/mint/SDL_systimer.c @ 821:30168104389f

Date: Sat, 14 Feb 2004 14:52:40 +0200 From: "Mike Gorchak" Subject: Batch of the QNX6 fixes for the SDL 1. Updated readme.QNX 2. Fixed crashes during intensive window updating under fast machines (got over 200 rectangles for update). 3. Fixed double-buffered fullscreen modes, now it works as needed. 4. Fixed Photon detection algorithm. 5. Fixed HWSURFACE update function. 6. Added SDL_PHOTON_FULLSCREEN_REFRESH environment variable support for control refresh rates under Photon. 7. Added 640x400 fullscreen mode emulation via 640x480 (if videodriver not supports original 640x400 mode of course) shifted by 40 vertical pixels from begin, to center it. It's needed for some old DOS games which ran in doubled 320x200 mode. 8. Added available video ram amount support. 8. Added hardware surface allocation/deallocation support if current videomode and videodriver supports it. 9. Added hardware filling support. 10. Added hardware blits support (simple and colorkeyed). And I've added to testvidinfo test color-keyed blits benchmark (maybe need to add alpha blits benchmark too ?). Currently Photon not supporting any alpha hardware blittings (all drivers lack of alpha blitting code support, only software alpha blitting exist in photon, which is hundreds times slowest than the SDL's one). So I've not added the alpha support. I suppose new QNX 6.3 will have the hardware alpha support, so when it will be done, I'll add alpha support.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 14 Feb 2004 20:22:21 +0000
parents b8d311d90021
children 63b8e93a3a52
line wrap: on
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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@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/*
 *	TOS/MiNT timer driver
 *	based on vbl vector
 *
 *	Patrice Mandin
 */

#include <stdio.h>
#include <sys/time.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#include <mint/osbind.h>
#include <mint/sysvars.h>

#include "SDL_error.h"
#include "SDL_timer.h"
#include "SDL_timer_c.h"
#include "SDL_thread.h"

#include "mint/SDL_vbltimer_s.h"

/* The first ticks value of the application */
static Uint32 start;
static SDL_bool supervisor;

void SDL_StartTicks(void)
{
	void *oldpile;

	/* Set first ticks value */
	oldpile=(void *)Super(0);
	start=*((volatile long *)_hz_200);
	Super(oldpile);

	start *= 5;	/* One _hz_200 tic is 5ms */
}

Uint32 SDL_GetTicks (void)
{
	Uint32 now;
	void *oldpile;

	/* Check if we are in supervisor mode 
	   (this is the case when called from SDL_ThreadedTimerCheck,
	   which is called from RunTimer, running in the vbl vector)
	*/
	if (!supervisor) {
		oldpile=(void *)Super(0);
	}

	now=*((volatile long *)_hz_200);

	if (!supervisor) {
		Super(oldpile);
	}

	return((now*5)-start);
}

void SDL_Delay (Uint32 ms)
{
	Uint32 now;

	now = SDL_GetTicks();
	while ((SDL_GetTicks()-now)<ms){
	}
}

/* Data to handle a single periodic alarm */
static SDL_bool timer_installed=SDL_FALSE;

static void RunTimer(void)
{
	supervisor=SDL_TRUE;
	SDL_ThreadedTimerCheck();
	supervisor=SDL_FALSE;
}

/* This is only called if the event thread is not running */
int SDL_SYS_TimerInit(void)
{
	void *oldpile;

	supervisor=SDL_FALSE;

	/* Install RunTimer in vbl vector */
	oldpile=(void *)Super(0);
	timer_installed = !SDL_AtariVblInstall(RunTimer);
	Super(oldpile);

	if (!timer_installed) {
		return(-1);
	}
	return(SDL_SetTimerThreaded(0));
}

void SDL_SYS_TimerQuit(void)
{
	void *oldpile;

	if (timer_installed) {
		/* Uninstall RunTimer vbl vector */
		oldpile=(void *)Super(0);
		SDL_AtariVblUninstall(RunTimer);
		Super(oldpile);
		timer_installed = SDL_FALSE;
	}
}

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

void SDL_SYS_StopTimer(void)
{
	return;
}