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SDL_x11dyn.c
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SDL_x11dyn.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2004 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@libsdl.org
*/
#include "SDL_config.h"
#define DEBUG_DYNAMIC_X11 0
#include "SDL_x11dyn.h"
#if DEBUG_DYNAMIC_X11
#include <stdio.h>
#endif
#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
#include "SDL_name.h"
#include "SDL_loadso.h"
typedef struct
{
void *lib;
const char *libname;
} x11dynlib;
#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC
#define SDL_VIDEO_DRIVER_X11_DYNAMIC NULL
#endif
#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
#endif
#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER NULL
#endif
#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
#endif
static x11dynlib x11libs[] = {
{NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC},
{NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT},
{NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER},
{NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR},
};
static void
X11_GetSym(const char *fnname, int *rc, void **fn)
{
int i;
for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
if (x11libs[i].lib != NULL) {
*fn = SDL_LoadFunction(x11libs[i].lib, fnname);
if (*fn != NULL)
break;
}
}
#if DEBUG_DYNAMIC_X11
if (*fn != NULL)
printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname,
*fn);
else
printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
#endif
if (*fn == NULL)
*rc = 0; /* kill this module. */
}
/* Define all the function pointers and wrappers... */
#define SDL_X11_MODULE(modname)
#define SDL_X11_SYM(rc,fn,params,args,ret) \
static rc (*p##fn) params = NULL; \
rc fn params { ret p##fn args ; }
#include "SDL_x11sym.h"
#undef SDL_X11_MODULE
#undef SDL_X11_SYM
#endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
/* Annoying varargs entry point... */
#ifdef X_HAVE_UTF8_STRING
XIC(*pXCreateIC) (XIM,...) = NULL;
#endif
/* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
#define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
#define SDL_X11_SYM(rc,fn,params,args,ret)
#include "SDL_x11sym.h"
#undef SDL_X11_MODULE
#undef SDL_X11_SYM
static int x11_load_refcount = 0;
void
SDL_X11_UnloadSymbols(void)
{
#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
/* Don't actually unload if more than one module is using the libs... */
if (x11_load_refcount > 0) {
if (--x11_load_refcount == 0) {
int i;
/* set all the function pointers to NULL. */
#define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1;
#define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
#include "SDL_x11sym.h"
#undef SDL_X11_MODULE
#undef SDL_X11_SYM
#ifdef X_HAVE_UTF8_STRING
pXCreateIC = NULL;
#endif
for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
if (x11libs[i].lib != NULL) {
SDL_UnloadObject(x11libs[i].lib);
x11libs[i].lib = NULL;
}
}
}
}
#endif
}
/* returns non-zero if all needed symbols were loaded. */
int
SDL_X11_LoadSymbols(void)
{
int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
/* deal with multiple modules (dga, x11, etc) needing these symbols... */
if (x11_load_refcount++ == 0) {
int i;
int *thismod = NULL;
for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
if (x11libs[i].libname != NULL) {
x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
}
}
#define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
#define SDL_X11_SYM(a,fn,x,y,z) X11_GetSym(#fn,thismod,(void**)&p##fn);
#include "SDL_x11sym.h"
#undef SDL_X11_MODULE
#undef SDL_X11_SYM
#ifdef X_HAVE_UTF8_STRING
X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8, (void **) &pXCreateIC);
#endif
if (SDL_X11_HAVE_BASEXLIB) { /* all required symbols loaded. */
SDL_ClearError();
} else {
SDL_X11_UnloadSymbols(); /* in case something got loaded... */
rc = 0;
}
}
#else
#ifdef X_HAVE_UTF8_STRING
pXCreateIC = XCreateIC;
#endif
#endif
return rc;
}
/* vi: set ts=4 sw=4 expandtab: */