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/* $Id$ */

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/** @file sdl.cpp */

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#include "stdafx.h"

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#ifdef WITH_SDL

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#include "openttd.h"

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#include "sdl.h"

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#include <SDL.h>

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#ifdef UNIX

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#include <signal.h>

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#ifdef __MORPHOS__

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	// The system supplied definition of SIG_DFL is wrong on MorphOS

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	#undef SIG_DFL

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	#define SIG_DFL (void (*)(int))0

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#endif

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#endif

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static int _sdl_usage;

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#ifdef DYNAMICALLY_LOADED_SDL

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#include "win32.h"

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#define M(x) x "\0"

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static const char sdl_files[] =

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	M("sdl.dll")

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	M("SDL_Init")

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	M("SDL_InitSubSystem")

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	M("SDL_GetError")

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	M("SDL_QuitSubSystem")

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	M("SDL_UpdateRect")

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	M("SDL_UpdateRects")

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	M("SDL_SetColors")

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	M("SDL_WM_SetCaption")

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	M("SDL_ShowCursor")

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	M("SDL_FreeSurface")

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	M("SDL_PollEvent")

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	M("SDL_WarpMouse")

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	M("SDL_GetTicks")

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	M("SDL_OpenAudio")

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	M("SDL_PauseAudio")

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	M("SDL_CloseAudio")

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	M("SDL_LockSurface")

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	M("SDL_UnlockSurface")

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	M("SDL_GetModState")

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	M("SDL_Delay")

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	M("SDL_Quit")

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	M("SDL_SetVideoMode")

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	M("SDL_EnableKeyRepeat")

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	M("SDL_EnableUNICODE")

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	M("SDL_VideoDriverName")

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	M("SDL_ListModes")

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	M("SDL_GetKeyState")

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	M("SDL_LoadBMP_RW")

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	M("SDL_RWFromFile")

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	M("SDL_SetColorKey")

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	M("SDL_WM_SetIcon")

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	M("SDL_MapRGB")

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	M("")

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;

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#undef M

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SDLProcs sdl_proc;

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static const char *LoadSdlDLL()

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{

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	if (sdl_proc.SDL_Init != NULL)

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		return NULL;

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	if (!LoadLibraryList((Function *)(void *)&sdl_proc, sdl_files))

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		return "Unable to load sdl.dll";

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	return NULL;

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}

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#endif // DYNAMICALLY_LOADED_SDL

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#ifdef UNIX

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static void SdlAbort(int sig)

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{

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	/* Own hand-made parachute for the cases of failed assertions. */

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	SDL_CALL SDL_Quit();

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	switch (sig) {

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		case SIGSEGV:

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		case SIGFPE:

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			signal(sig, SIG_DFL);

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			raise(sig);

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			break;

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		default:

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			break;

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	}

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}

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#endif

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const char* SdlOpen(uint32 x)

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{

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#ifdef DYNAMICALLY_LOADED_SDL

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	{

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		const char *s = LoadSdlDLL();

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		if (s != NULL) return s;

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	}

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#endif

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	if (_sdl_usage++ == 0) {

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		if (SDL_CALL SDL_Init(x) == -1)

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			return SDL_CALL SDL_GetError();

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	} else if (x != 0) {

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		if (SDL_CALL SDL_InitSubSystem(x) == -1)

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			return SDL_CALL SDL_GetError();

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	}

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#ifdef UNIX

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	signal(SIGABRT, SdlAbort);

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	signal(SIGSEGV, SdlAbort);

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	signal(SIGFPE, SdlAbort);

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#endif

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	return NULL;

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}

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void SdlClose(uint32 x)

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{

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	if (x != 0)

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		SDL_CALL SDL_QuitSubSystem(x);

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	if (--_sdl_usage == 0) {

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		SDL_CALL SDL_Quit();

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		#ifdef UNIX

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		signal(SIGABRT, SIG_DFL);

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		signal(SIGSEGV, SIG_DFL);

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		signal(SIGFPE, SIG_DFL);

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		#endif

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	}

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}

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#endif