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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: SDL.c,v 1.3 2001/05/23 23:35:09 hercules Exp $";

#endif

/* Initialization code for SDL */

#include 		/* For getenv() */

#include "SDL.h"

#include "SDL_endian.h"

#include "SDL_fatal.h"

#ifndef DISABLE_VIDEO

#include "SDL_leaks.h"

#endif

/* Initialization/Cleanup routines */

#ifndef DISABLE_JOYSTICK

extern int  SDL_JoystickInit(void);

extern void SDL_JoystickQuit(void);

#endif

#ifndef DISABLE_CDROM

extern int  SDL_CDROMInit(void);

extern void SDL_CDROMQuit(void);

#endif

#ifndef DISABLE_TIMERS

extern void SDL_StartTicks(void);

extern int  SDL_TimerInit(void);

extern void SDL_TimerQuit(void);

#endif

/* The current SDL version */

static SDL_version version =

	{ SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL };

/* The initialized subsystems */

static Uint32 SDL_initialized = 0;

static Uint32 ticks_started = 0;

#ifdef CHECK_LEAKS

int surfaces_allocated = 0;

#endif

int SDL_InitSubSystem(Uint32 flags)

{

#ifndef DISABLE_VIDEO

	/* Initialize the video/event subsystem */

	if ( (flags & SDL_INIT_VIDEO) && !(SDL_initialized & SDL_INIT_VIDEO) ) {

		if ( SDL_VideoInit(getenv("SDL_VIDEODRIVER"),

		                   (flags&SDL_INIT_EVENTTHREAD)) < 0 ) {

			return(-1);

		}

		SDL_initialized |= SDL_INIT_VIDEO;

	}

#else

	if ( flags & SDL_INIT_VIDEO ) {

		SDL_SetError("SDL not built with video support");

		return(-1);

	}

#endif

#ifndef DISABLE_AUDIO

	/* Initialize the audio subsystem */

	if ( (flags & SDL_INIT_AUDIO) && !(SDL_initialized & SDL_INIT_AUDIO) ) {

		if ( SDL_AudioInit(getenv("SDL_AUDIODRIVER")) < 0 ) {

			return(-1);

		}

		SDL_initialized |= SDL_INIT_AUDIO;

	}

#else

	if ( flags & SDL_INIT_AUDIO ) {

		SDL_SetError("SDL not built with audio support");

		return(-1);

	}

#endif

#ifndef DISABLE_TIMERS

	/* Initialize the timer subsystem */

	if ( ! ticks_started ) {

		SDL_StartTicks();

		ticks_started = 1;

	}

	if ( (flags & SDL_INIT_TIMER) && !(SDL_initialized & SDL_INIT_TIMER) ) {

		if ( SDL_TimerInit() < 0 ) {

			return(-1);

		}

		SDL_initialized |= SDL_INIT_TIMER;

	}

#else

	if ( flags & SDL_INIT_TIMER ) {

		SDL_SetError("SDL not built with timer support");

		return(-1);

	}

#endif

#ifndef DISABLE_JOYSTICK

	/* Initialize the joystick subsystem */

	if ( (flags & SDL_INIT_JOYSTICK) &&

	     !(SDL_initialized & SDL_INIT_JOYSTICK) ) {

		if ( SDL_JoystickInit() < 0 ) {

			return(-1);

		}

		SDL_initialized |= SDL_INIT_JOYSTICK;

	}

#else

	if ( flags & SDL_INIT_JOYSTICK ) {

		SDL_SetError("SDL not built with joystick support");

		return(-1);

	}

#endif

#ifndef DISABLE_CDROM

	/* Initialize the CD-ROM subsystem */

	if ( (flags & SDL_INIT_CDROM) && !(SDL_initialized & SDL_INIT_CDROM) ) {

		if ( SDL_CDROMInit() < 0 ) {

			return(-1);

		}

		SDL_initialized |= SDL_INIT_CDROM;

	}

#else

	if ( flags & SDL_INIT_CDROM ) {

		SDL_SetError("SDL not built with cdrom support");

		return(-1);

	}

#endif

	return(0);

}

int SDL_Init(Uint32 flags)

{

	/* Clear the error message */

	SDL_ClearError();

	/* Initialize the desired subsystems */

	if ( SDL_InitSubSystem(flags) < 0 ) {

		return(-1);

	}

	/* Everything is initialized */

	if ( !(flags & SDL_INIT_NOPARACHUTE) ) {

		SDL_InstallParachute();

	}

	return(0);

}

void SDL_QuitSubSystem(Uint32 flags)

{

	/* Shut down requested initialized subsystems */

#ifndef DISABLE_CDROM

	if ( (flags & SDL_initialized & SDL_INIT_CDROM) ) {

		SDL_CDROMQuit();

		SDL_initialized &= ~SDL_INIT_CDROM;

	}

#endif

#ifndef DISABLE_JOYSTICK

	if ( (flags & SDL_initialized & SDL_INIT_JOYSTICK) ) {

		SDL_JoystickQuit();

		SDL_initialized &= ~SDL_INIT_JOYSTICK;

	}

#endif

#ifndef DISABLE_TIMERS

	if ( (flags & SDL_initialized & SDL_INIT_TIMER) ) {

		SDL_TimerQuit();

		SDL_initialized &= ~SDL_INIT_TIMER;

	}

#endif

#ifndef DISABLE_AUDIO

	if ( (flags & SDL_initialized & SDL_INIT_AUDIO) ) {

		SDL_AudioQuit();

		SDL_initialized &= ~SDL_INIT_AUDIO;

	}

#endif

#ifndef DISABLE_VIDEO

	if ( (flags & SDL_initialized & SDL_INIT_VIDEO) ) {

		SDL_VideoQuit();

		SDL_initialized &= ~SDL_INIT_VIDEO;

	}

#endif

}

Uint32 SDL_WasInit(Uint32 flags)

{

	if ( ! flags ) {

		flags = SDL_INIT_EVERYTHING;

	}

	return (SDL_initialized&flags);

}

void SDL_Quit(void)

{

	/* Quit all subsystems */

	SDL_QuitSubSystem(SDL_INIT_EVERYTHING);

#ifdef CHECK_LEAKS

	/* Print the number of surfaces not freed */

	if ( surfaces_allocated != 0 ) {

		SDL_printf("SDL Warning: %d SDL surfaces extant\n",

							surfaces_allocated);

	}

#endif

	/* Uninstall any parachute signal handlers */

	SDL_UninstallParachute();

}

/* Return the library version number */

const SDL_version * SDL_Linked_Version(void)

{

	return(&version);

}