/*

    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

*/

/* Initialization code for SDL */

#ifdef ENABLE_PTH

#include <pth.h>

#endif

#include "SDL.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(SDL_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(SDL_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)

{

#if !defined(DISABLE_THREADS) && defined(ENABLE_PTH)

	if (!pth_init()) {

		return -1;

	}

#endif

	/* 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 */

#ifdef DEBUG_BUILD

  printf("[SDL_Quit] : Enter! Calling QuitSubSystem()\n"); fflush(stdout);

#endif

	SDL_QuitSubSystem(SDL_INIT_EVERYTHING);

#ifdef CHECK_LEAKS

#ifdef DEBUG_BUILD

  printf("[SDL_Quit] : CHECK_LEAKS\n"); fflush(stdout);

#endif

	/* Print the number of surfaces not freed */

	if ( surfaces_allocated != 0 ) {

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

							surfaces_allocated);

	}

#endif

#ifdef DEBUG_BUILD

  printf("[SDL_Quit] : SDL_UninstallParachute()\n"); fflush(stdout);

#endif

	/* Uninstall any parachute signal handlers */

	SDL_UninstallParachute();

#if !defined(DISABLE_THREADS) && defined(ENABLE_PTH)

	pth_kill();

#endif

#ifdef DEBUG_BUILD

  printf("[SDL_Quit] : Returning!\n"); fflush(stdout);

#endif

}

/* Return the library version number */

const SDL_version * SDL_Linked_Version(void)

{

	return(&version);

}

#if defined(__OS2__)

// Building for OS/2

#ifdef __WATCOMC__

#define INCL_DOSERRORS

#define INCL_DOSEXCEPTIONS

#include <os2.h>

// Exception handler to prevent the Audio thread hanging, making a zombie process!

ULONG _System SDL_Main_ExceptionHandler(PEXCEPTIONREPORTRECORD pERepRec,

                                        PEXCEPTIONREGISTRATIONRECORD pERegRec,

                                        PCONTEXTRECORD pCtxRec,

                                        PVOID p)

{

  if (pERepRec->fHandlerFlags & EH_EXIT_UNWIND)

    return XCPT_CONTINUE_SEARCH;

  if (pERepRec->fHandlerFlags & EH_UNWINDING)

    return XCPT_CONTINUE_SEARCH;

  if (pERepRec->fHandlerFlags & EH_NESTED_CALL)

    return XCPT_CONTINUE_SEARCH;

  // Do cleanup at every fatal exception!

  if (((pERepRec->ExceptionNum & XCPT_SEVERITY_CODE) == XCPT_FATAL_EXCEPTION) &&

      (pERepRec->ExceptionNum != XCPT_BREAKPOINT) &&

      (pERepRec->ExceptionNum != XCPT_SINGLE_STEP)

     )

  {

    if (SDL_initialized & SDL_INIT_AUDIO)

    {

      // This removes the zombie audio thread in case of emergency.

#ifdef DEBUG_BUILD

      printf("[SDL_Main_ExceptionHandler] : Calling SDL_CloseAudio()!\n");

#endif

      SDL_CloseAudio();

    }

  }

  return (XCPT_CONTINUE_SEARCH);

}

EXCEPTIONREGISTRATIONRECORD SDL_Main_xcpthand = {0, SDL_Main_ExceptionHandler};

// The main DLL entry for DLL Initialization and Uninitialization:

unsigned _System LibMain(unsigned hmod, unsigned termination)

{

  if (termination)

  {

#ifdef DEBUG_BUILD

//    printf("[SDL DLL Unintialization] : Removing exception handler\n");

#endif

    DosUnsetExceptionHandler(&SDL_Main_xcpthand);

    return 1;

  } else

  {

#ifdef DEBUG_BUILD

    // Make stdout and stderr unbuffered!

    setbuf(stdout, NULL);

    setbuf(stderr, NULL);

#endif

    // Fire up exception handler

#ifdef DEBUG_BUILD

//    printf("[SDL DLL Initialization] : Setting exception handler\n");

#endif

    // Set exception handler

    DosSetExceptionHandler(&SDL_Main_xcpthand);

    return 1;

  }

}

#endif /* __WATCOMC__ */

#elif defined(_WIN32)

#if !defined(HAVE_LIBC) || defined(_WIN32_WCE) || (defined(__WATCOMC__) && defined(BUILD_DLL))

/* Need to include DllMain() on Windows CE and Watcom C for some reason.. */

#include "SDL_windows.h"

BOOL APIENTRY _DllMainCRTStartup( HANDLE hModule, 

                       DWORD  ul_reason_for_call, 

                       LPVOID lpReserved )

{

	switch (ul_reason_for_call) {

		case DLL_PROCESS_ATTACH:

		case DLL_THREAD_ATTACH:

		case DLL_THREAD_DETACH:

		case DLL_PROCESS_DETACH:

			break;

	}

	return TRUE;

}

#endif /* _WIN32_WCE and building DLL with Watcom C */

#endif /* OS/2 elif _WIN32 */