/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 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

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

#ifdef SDL_TIMER_MINT

/*

 *	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/cookie.h>

#include <mint/sysvars.h>

#include <mint/osbind.h>

#include <mint/mintbind.h>

#include "SDL_timer.h"

#include "../SDL_timer_c.h"

#include "SDL_thread.h"

#include "SDL_vbltimer_s.h"

/* from audio/mint */

void SDL_MintAudio_CheckFpu(void);

/* The first ticks value of the application */

static Uint32 start;

static SDL_bool read_hz200_from_vbl = SDL_FALSE;

static int mint_present; /* can we use Syield() ? */

void SDL_StartTicks(void)

{

	void *old_stack;

	unsigned long dummy;

	/* Set first ticks value */

	old_stack = (void *)Super(0);

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

	Super(old_stack);

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

	mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);

}

Uint32 SDL_GetTicks (void)

{

	Uint32 now = start;

	if (read_hz200_from_vbl) {

		now = SDL_Atari_hz200;

	} else {

		void *old_stack = (void *)Super(0);

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

		Super(old_stack);

	}

	return((now*5)-start);

}

void SDL_Delay (Uint32 ms)

{

	Uint32 now;

	now = SDL_GetTicks();

	while ((SDL_GetTicks()-now)<ms){

		if (mint_present) {

			Syield();

		}

	}

}

/* Data to handle a single periodic alarm */

static SDL_bool timer_installed=SDL_FALSE;

/* This is only called if the event thread is not running */

int SDL_SYS_TimerInit(void)

{

	void *old_stack;

	SDL_MintAudio_CheckFpu();

	/* Install RunTimer in vbl vector */

	old_stack = (void *)Super(0);

	timer_installed = !SDL_AtariVblInstall(SDL_ThreadedTimerCheck);

	Super(old_stack);

	if (!timer_installed) {

		return(-1);

	}

	read_hz200_from_vbl = SDL_TRUE;

	return(SDL_SetTimerThreaded(0));

}

void SDL_SYS_TimerQuit(void)

{

	/* Uninstall RunTimer vbl vector */

	if (timer_installed) {

		void *old_stack = (void *)Super(0);

		SDL_AtariVblUninstall(SDL_ThreadedTimerCheck);

		Super(old_stack);

		timer_installed = SDL_FALSE;

	}

	read_hz200_from_vbl = SDL_FALSE;

}

int SDL_SYS_StartTimer(void)

{

	SDL_SetError("Internal logic error: MiNT uses vbl timer");

	return(-1);

}

void SDL_SYS_StopTimer(void)

{

	return;

}

#endif /* SDL_TIMER_MINT */