src/SDL.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 06 Feb 2006 08:28:51 +0000
changeset 1330 450721ad5436
parent 1312 c9b51268668f
child 1336 3692456e7b0f
permissions -rw-r--r--
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* Initialization code for SDL */
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#ifdef ENABLE_PTH
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#include <pth.h>
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#endif
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#include "SDL.h"
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#include "SDL_endian.h"
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#include "SDL_fatal.h"
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#include "SDL_stdlib.h"
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#ifndef DISABLE_VIDEO
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#include "SDL_leaks.h"
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#endif
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/* Initialization/Cleanup routines */
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#ifndef DISABLE_JOYSTICK
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extern int  SDL_JoystickInit(void);
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extern void SDL_JoystickQuit(void);
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#endif
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#ifndef DISABLE_CDROM
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extern int  SDL_CDROMInit(void);
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extern void SDL_CDROMQuit(void);
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#endif
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#ifndef DISABLE_TIMERS
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extern void SDL_StartTicks(void);
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extern int  SDL_TimerInit(void);
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extern void SDL_TimerQuit(void);
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#endif
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/* The current SDL version */
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static SDL_version version = 
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	{ SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL };
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/* The initialized subsystems */
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static Uint32 SDL_initialized = 0;
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static Uint32 ticks_started = 0;
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#ifdef CHECK_LEAKS
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int surfaces_allocated = 0;
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#endif
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int SDL_InitSubSystem(Uint32 flags)
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{
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#ifndef DISABLE_VIDEO
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	/* Initialize the video/event subsystem */
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	if ( (flags & SDL_INIT_VIDEO) && !(SDL_initialized & SDL_INIT_VIDEO) ) {
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		if ( SDL_VideoInit(getenv("SDL_VIDEODRIVER"),
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		                   (flags&SDL_INIT_EVENTTHREAD)) < 0 ) {
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			return(-1);
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		}
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		SDL_initialized |= SDL_INIT_VIDEO;
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	}
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#else
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	if ( flags & SDL_INIT_VIDEO ) {
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		SDL_SetError("SDL not built with video support");
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		return(-1);
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	}
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#endif
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#ifndef DISABLE_AUDIO
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	/* Initialize the audio subsystem */
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	if ( (flags & SDL_INIT_AUDIO) && !(SDL_initialized & SDL_INIT_AUDIO) ) {
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		if ( SDL_AudioInit(getenv("SDL_AUDIODRIVER")) < 0 ) {
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			return(-1);
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		}
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		SDL_initialized |= SDL_INIT_AUDIO;
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	}
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#else
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	if ( flags & SDL_INIT_AUDIO ) {
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		SDL_SetError("SDL not built with audio support");
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		return(-1);
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	}
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#endif
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#ifndef DISABLE_TIMERS
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	/* Initialize the timer subsystem */
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	if ( ! ticks_started ) {
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		SDL_StartTicks();
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		ticks_started = 1;
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	}
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	if ( (flags & SDL_INIT_TIMER) && !(SDL_initialized & SDL_INIT_TIMER) ) {
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		if ( SDL_TimerInit() < 0 ) {
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			return(-1);
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		}
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		SDL_initialized |= SDL_INIT_TIMER;
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	}
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#else
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	if ( flags & SDL_INIT_TIMER ) {
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		SDL_SetError("SDL not built with timer support");
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		return(-1);
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	}
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#endif
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#ifndef DISABLE_JOYSTICK
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	/* Initialize the joystick subsystem */
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	if ( (flags & SDL_INIT_JOYSTICK) &&
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	     !(SDL_initialized & SDL_INIT_JOYSTICK) ) {
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		if ( SDL_JoystickInit() < 0 ) {
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			return(-1);
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		}
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		SDL_initialized |= SDL_INIT_JOYSTICK;
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	}
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#else
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	if ( flags & SDL_INIT_JOYSTICK ) {
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		SDL_SetError("SDL not built with joystick support");
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		return(-1);
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	}
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#endif
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#ifndef DISABLE_CDROM
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	/* Initialize the CD-ROM subsystem */
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	if ( (flags & SDL_INIT_CDROM) && !(SDL_initialized & SDL_INIT_CDROM) ) {
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		if ( SDL_CDROMInit() < 0 ) {
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			return(-1);
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		}
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		SDL_initialized |= SDL_INIT_CDROM;
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	}
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#else
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	if ( flags & SDL_INIT_CDROM ) {
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		SDL_SetError("SDL not built with cdrom support");
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		return(-1);
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	}
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#endif
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	return(0);
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}
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int SDL_Init(Uint32 flags)
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{
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#if !defined(DISABLE_THREADS) && defined(ENABLE_PTH)
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	if (!pth_init()) {
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		return -1;
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	}
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#endif
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	/* Clear the error message */
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	SDL_ClearError();
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	/* Initialize the desired subsystems */
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	if ( SDL_InitSubSystem(flags) < 0 ) {
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		return(-1);
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	}
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	/* Everything is initialized */
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	if ( !(flags & SDL_INIT_NOPARACHUTE) ) {
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		SDL_InstallParachute();
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	}
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	return(0);
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}
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void SDL_QuitSubSystem(Uint32 flags)
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{
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	/* Shut down requested initialized subsystems */
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#ifndef DISABLE_CDROM
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	if ( (flags & SDL_initialized & SDL_INIT_CDROM) ) {
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		SDL_CDROMQuit();
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		SDL_initialized &= ~SDL_INIT_CDROM;
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	}
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#endif
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#ifndef DISABLE_JOYSTICK
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	if ( (flags & SDL_initialized & SDL_INIT_JOYSTICK) ) {
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		SDL_JoystickQuit();
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		SDL_initialized &= ~SDL_INIT_JOYSTICK;
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	}
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#endif
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#ifndef DISABLE_TIMERS
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	if ( (flags & SDL_initialized & SDL_INIT_TIMER) ) {
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		SDL_TimerQuit();
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		SDL_initialized &= ~SDL_INIT_TIMER;
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	}
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#endif
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#ifndef DISABLE_AUDIO
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	if ( (flags & SDL_initialized & SDL_INIT_AUDIO) ) {
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		SDL_AudioQuit();
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		SDL_initialized &= ~SDL_INIT_AUDIO;
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	}
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#endif
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#ifndef DISABLE_VIDEO
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	if ( (flags & SDL_initialized & SDL_INIT_VIDEO) ) {
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		SDL_VideoQuit();
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		SDL_initialized &= ~SDL_INIT_VIDEO;
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	}
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#endif
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}
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Uint32 SDL_WasInit(Uint32 flags)
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{
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	if ( ! flags ) {
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		flags = SDL_INIT_EVERYTHING;
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	}
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	return (SDL_initialized&flags);
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}
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void SDL_Quit(void)
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{
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	/* Quit all subsystems */
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#ifdef DEBUG_BUILD
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  printf("[SDL_Quit] : Enter! Calling QuitSubSystem()\n"); fflush(stdout);
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#endif
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	SDL_QuitSubSystem(SDL_INIT_EVERYTHING);
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#ifdef CHECK_LEAKS
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#ifdef DEBUG_BUILD
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  printf("[SDL_Quit] : CHECK_LEAKS\n"); fflush(stdout);
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#endif
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	/* Print the number of surfaces not freed */
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	if ( surfaces_allocated != 0 ) {
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		fprintf(stderr, "SDL Warning: %d SDL surfaces extant\n", 
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							surfaces_allocated);
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	}
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#endif
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#ifdef DEBUG_BUILD
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  printf("[SDL_Quit] : SDL_UninstallParachute()\n"); fflush(stdout);
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#endif
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	/* Uninstall any parachute signal handlers */
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	SDL_UninstallParachute();
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#if !defined(DISABLE_THREADS) && defined(ENABLE_PTH)
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	pth_kill();
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#endif
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#ifdef DEBUG_BUILD
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  printf("[SDL_Quit] : Returning!\n"); fflush(stdout);
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#endif
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}
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/* Return the library version number */
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const SDL_version * SDL_Linked_Version(void)
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{
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	return(&version);
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}
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#if defined(__OS2__)
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// Building for OS/2
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#ifdef __WATCOMC__
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#define INCL_DOSERRORS
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#define INCL_DOSEXCEPTIONS
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#include <os2.h>
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// Exception handler to prevent the Audio thread hanging, making a zombie process!
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ULONG _System SDL_Main_ExceptionHandler(PEXCEPTIONREPORTRECORD pERepRec,
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                                        PEXCEPTIONREGISTRATIONRECORD pERegRec,
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                                        PCONTEXTRECORD pCtxRec,
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                                        PVOID p)
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{
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  if (pERepRec->fHandlerFlags & EH_EXIT_UNWIND)
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    return XCPT_CONTINUE_SEARCH;
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  if (pERepRec->fHandlerFlags & EH_UNWINDING)
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    return XCPT_CONTINUE_SEARCH;
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  if (pERepRec->fHandlerFlags & EH_NESTED_CALL)
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    return XCPT_CONTINUE_SEARCH;
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  // Do cleanup at every fatal exception!
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  if (((pERepRec->ExceptionNum & XCPT_SEVERITY_CODE) == XCPT_FATAL_EXCEPTION) &&
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      (pERepRec->ExceptionNum != XCPT_BREAKPOINT) &&
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      (pERepRec->ExceptionNum != XCPT_SINGLE_STEP)
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     )
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  {
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    if (SDL_initialized & SDL_INIT_AUDIO)
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    {
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      // This removes the zombie audio thread in case of emergency.
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#ifdef DEBUG_BUILD
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      printf("[SDL_Main_ExceptionHandler] : Calling SDL_CloseAudio()!\n");
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#endif
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      SDL_CloseAudio();
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    }
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  }
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  return (XCPT_CONTINUE_SEARCH);
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}
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EXCEPTIONREGISTRATIONRECORD SDL_Main_xcpthand = {0, SDL_Main_ExceptionHandler};
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// The main DLL entry for DLL Initialization and Uninitialization:
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unsigned _System LibMain(unsigned hmod, unsigned termination)
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{
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  if (termination)
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  {
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#ifdef DEBUG_BUILD
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//    printf("[SDL DLL Unintialization] : Removing exception handler\n");
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#endif
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    DosUnsetExceptionHandler(&SDL_Main_xcpthand);
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    return 1;
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  } else
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  {
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#ifdef DEBUG_BUILD
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    // Make stdout and stderr unbuffered!
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    setbuf(stdout, NULL);
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    setbuf(stderr, NULL);
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#endif
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    // Fire up exception handler
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#ifdef DEBUG_BUILD
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//    printf("[SDL DLL Initialization] : Setting exception handler\n");
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#endif
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    // Set exception handler
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    DosSetExceptionHandler(&SDL_Main_xcpthand);
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    return 1;
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  }
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}
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#endif /* __WATCOMC__ */
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#elif defined(_WIN32)
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#if !defined(HAVE_LIBC) || defined(_WIN32_WCE) || (defined(__WATCOMC__) && defined(BUILD_DLL))
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/* Need to include DllMain() on Windows CE and Watcom C for some reason.. */
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#include "SDL_windows.h"
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BOOL APIENTRY _DllMainCRTStartup( HANDLE hModule, 
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                       DWORD  ul_reason_for_call, 
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                       LPVOID lpReserved )
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{
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	switch (ul_reason_for_call) {
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		case DLL_PROCESS_ATTACH:
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		case DLL_THREAD_ATTACH:
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		case DLL_THREAD_DETACH:
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		case DLL_PROCESS_DETACH:
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			break;
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	}
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	return TRUE;
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}
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#endif /* _WIN32_WCE and building DLL with Watcom C */
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#endif /* OS/2 elif _WIN32 */