src/video/x11/SDL_x11dyn.c
author Ryan C. Gordon <icculus@icculus.org>
Wed, 22 Mar 2006 05:00:59 +0000
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Updated dynamic X11 code. See details in Bugzilla #170.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 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 Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 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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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#if 1
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#define DEBUG_DYNAMIC_X11 1
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#endif
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#include "SDL_x11dyn.h"
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#ifdef DEBUG_DYNAMIC_X11
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#include <stdio.h>
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#endif
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#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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#include <dlfcn.h>
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#include "SDL_name.h"
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#include "SDL_loadso.h"
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static const char *x11_library = SDL_VIDEO_DRIVER_X11_DYNAMIC;
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static void *x11_handle = NULL;
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static const char *x11ext_library = SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT;
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static void *x11ext_handle = NULL;
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typedef struct
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{
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    void *lib;
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    const char *libname;
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} x11libitem;
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static void *X11_GetSym(const char *fnname, int *rc)
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{
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	int i;
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	void *fn = NULL;
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	const x11libitem libs[] =
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	{
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		{ x11_handle, "libX11" },
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		{ x11ext_handle, "libX11ext" },
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	};
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	for (i = 0; i < (sizeof (libs) / sizeof (libs[0])); i++)
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	{
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		if (libs[i].lib != NULL)
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		{
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			fn = SDL_LoadFunction(libs[i].lib, fnname);
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			if (fn != NULL)
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				break;
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		}
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	}
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	#if DEBUG_DYNAMIC_X11
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	if (fn != NULL)
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	    printf("X11: Found '%s' in %s (%p)\n", fnname, libs[i].libname, fn);
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	else
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		printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
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	#endif
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	if (fn == NULL)
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		*rc = 0;  /* kill this module. */
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	return fn;
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}
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/* Define all the function pointers and wrappers... */
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#define SDL_X11_MODULE(modname)
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#define SDL_X11_SYM(rc,fn,params,args,ret) \
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	static rc (*p##fn) params = NULL; \
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	rc fn params { ret p##fn args ; }
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#include "SDL_x11sym.h"
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#undef SDL_X11_MODULE
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#undef SDL_X11_SYM
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#endif  /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
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/* Annoying varargs entry point... */
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#ifdef X_HAVE_UTF8_STRING
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XIC (*pXCreateIC)(XIM,...) = NULL;
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#endif
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/* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
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#define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
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#define SDL_X11_SYM(rc,fn,params,args,ret)
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#include "SDL_x11sym.h"
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#undef SDL_X11_MODULE
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#undef SDL_X11_SYM
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static int x11_load_refcount = 0;
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void SDL_X11_UnloadSymbols(void)
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{
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	#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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	/* Don't actually unload if more than one module is using the libs... */
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	if (x11_load_refcount > 0) {
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		if (--x11_load_refcount == 0) {
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			/* set all the function pointers to NULL. */
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			#define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1;
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			#define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
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			#include "SDL_x11sym.h"
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			#undef SDL_X11_MODULE
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			#undef SDL_X11_SYM
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            #ifdef X_HAVE_UTF8_STRING
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            pXCreateIC = NULL;
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            #endif
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			if (x11_handle != NULL) {
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				SDL_UnloadObject(x11_handle);
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				x11_handle = NULL;
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			}
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			if (x11ext_handle != NULL) {
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				SDL_UnloadObject(x11ext_handle);
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				x11ext_handle = NULL;
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			}
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		}
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	}
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	#endif
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}
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/* returns non-zero if all needed symbols were loaded. */
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int SDL_X11_LoadSymbols(void)
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{
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	int rc = 1;  /* always succeed if not using Dynamic X11 stuff. */
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	#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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	/* deal with multiple modules (dga, x11, etc) needing these symbols... */
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	if (x11_load_refcount++ == 0) {
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		int *thismod = NULL;
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		x11_handle = SDL_LoadObject(x11_library);
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		x11ext_handle = SDL_LoadObject(x11ext_library);
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		#define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
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		#define SDL_X11_SYM(a,fn,x,y,z) p##fn = X11_GetSym(#fn,thismod);
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		#include "SDL_x11sym.h"
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		#undef SDL_X11_MODULE
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		#undef SDL_X11_SYM
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		#ifdef X_HAVE_UTF8_STRING
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		pXCreateIC = X11_GetSym("XCreateIC",&SDL_X11_HAVE_UTF8);
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		#endif
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		if (!SDL_X11_HAVE_BASEXLIB) {  /* some required symbol didn't load. */
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			SDL_X11_UnloadSymbols();  /* in case something got loaded... */
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		}
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	}
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	#else
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		#ifdef X_HAVE_UTF8_STRING
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		pXCreateIC = XCreateIC;
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		#endif
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	#endif
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	return rc;
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}
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/* end of SDL_x11dyn.c ... */
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