/project/jni/sdl-1.3/src/video/x11/SDL_x11dyn.c

  1/*
  2  Simple DirectMedia Layer
  3  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
  4
  5  This software is provided 'as-is', without any express or implied
  6  warranty.  In no event will the authors be held liable for any damages
  7  arising from the use of this software.
  8
  9  Permission is granted to anyone to use this software for any purpose,
 10  including commercial applications, and to alter it and redistribute it
 11  freely, subject to the following restrictions:
 12
 13  1. The origin of this software must not be misrepresented; you must not
 14     claim that you wrote the original software. If you use this software
 15     in a product, an acknowledgment in the product documentation would be
 16     appreciated but is not required.
 17  2. Altered source versions must be plainly marked as such, and must not be
 18     misrepresented as being the original software.
 19  3. This notice may not be removed or altered from any source distribution.
 20*/
 21#include "SDL_config.h"
 22
 23#if SDL_VIDEO_DRIVER_X11
 24
 25#define DEBUG_DYNAMIC_X11 0
 26
 27#include "SDL_x11dyn.h"
 28
 29#if DEBUG_DYNAMIC_X11
 30#include <stdio.h>
 31#endif
 32
 33#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
 34
 35#include "SDL_name.h"
 36#include "SDL_loadso.h"
 37
 38typedef struct
 39{
 40    void *lib;
 41    const char *libname;
 42} x11dynlib;
 43
 44#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC
 45#define SDL_VIDEO_DRIVER_X11_DYNAMIC NULL
 46#endif
 47#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
 48#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
 49#endif
 50#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR
 51#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR NULL
 52#endif
 53#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA
 54#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA NULL
 55#endif
 56#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT
 57#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT NULL
 58#endif
 59#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
 60#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
 61#endif
 62#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
 63#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS NULL
 64#endif
 65#ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE
 66#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE NULL
 67#endif
 68
 69static x11dynlib x11libs[] = {
 70    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC},
 71    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT},
 72    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR},
 73    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA},
 74    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT},
 75    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR},
 76    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS},
 77    {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE}
 78};
 79
 80static void
 81X11_GetSym(const char *fnname, int *rc, void **fn)
 82{
 83    int i;
 84    for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
 85        if (x11libs[i].lib != NULL) {
 86            *fn = SDL_LoadFunction(x11libs[i].lib, fnname);
 87            if (*fn != NULL)
 88                break;
 89        }
 90    }
 91
 92#if DEBUG_DYNAMIC_X11
 93    if (*fn != NULL)
 94        printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname,
 95               *fn);
 96    else
 97        printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
 98#endif
 99
100    if (*fn == NULL)
101        *rc = 0;                /* kill this module. */
102}
103
104
105/* Define all the function pointers and wrappers... */
106#define SDL_X11_MODULE(modname)
107#define SDL_X11_SYM(rc,fn,params,args,ret) \
108	static rc (*p##fn) params = NULL; \
109	rc fn params { ret p##fn args ; }
110#include "SDL_x11sym.h"
111#undef SDL_X11_MODULE
112#undef SDL_X11_SYM
113#endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
114
115/* Annoying varargs entry point... */
116#ifdef X_HAVE_UTF8_STRING
117XIC(*pXCreateIC) (XIM,...) = NULL;
118char *(*pXGetICValues) (XIC, ...) = NULL;
119#endif
120
121/* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
122#define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 0;
123#define SDL_X11_SYM(rc,fn,params,args,ret)
124#include "SDL_x11sym.h"
125#undef SDL_X11_MODULE
126#undef SDL_X11_SYM
127
128
129static int x11_load_refcount = 0;
130
131void
132SDL_X11_UnloadSymbols(void)
133{
134#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
135    /* Don't actually unload if more than one module is using the libs... */
136    if (x11_load_refcount > 0) {
137        if (--x11_load_refcount == 0) {
138            int i;
139
140            /* set all the function pointers to NULL. */
141#define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 0;
142#define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
143#include "SDL_x11sym.h"
144#undef SDL_X11_MODULE
145#undef SDL_X11_SYM
146
147#ifdef X_HAVE_UTF8_STRING
148            pXCreateIC = NULL;
149            pXGetICValues = NULL;
150#endif
151
152            for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
153                if (x11libs[i].lib != NULL) {
154                    SDL_UnloadObject(x11libs[i].lib);
155                    x11libs[i].lib = NULL;
156                }
157            }
158        }
159    }
160#endif
161}
162
163/* returns non-zero if all needed symbols were loaded. */
164int
165SDL_X11_LoadSymbols(void)
166{
167    int rc = 1;                 /* always succeed if not using Dynamic X11 stuff. */
168
169#ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
170    /* deal with multiple modules (dga, x11, etc) needing these symbols... */
171    if (x11_load_refcount++ == 0) {
172        int i;
173        int *thismod = NULL;
174        for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
175            if (x11libs[i].libname != NULL) {
176                x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
177            }
178        }
179
180#define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
181#define SDL_X11_SYM(a,fn,x,y,z)
182#include "SDL_x11sym.h"
183#undef SDL_X11_MODULE
184#undef SDL_X11_SYM
185
186#define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
187#define SDL_X11_SYM(a,fn,x,y,z) X11_GetSym(#fn,thismod,(void**)&p##fn);
188#include "SDL_x11sym.h"
189#undef SDL_X11_MODULE
190#undef SDL_X11_SYM
191
192#ifdef X_HAVE_UTF8_STRING
193        X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8, (void **) &pXCreateIC);
194        X11_GetSym("XGetICValues", &SDL_X11_HAVE_UTF8,
195                   (void **) &pXGetICValues);
196#endif
197
198        if (SDL_X11_HAVE_BASEXLIB) {
199            /* all required symbols loaded. */
200            SDL_ClearError();
201        } else {
202            /* in case something got loaded... */
203            SDL_X11_UnloadSymbols();
204            rc = 0;
205        }
206    }
207#else
208#ifdef X_HAVE_UTF8_STRING
209    pXCreateIC = XCreateIC;
210    pXGetICValues = XGetICValues;
211#endif
212#endif
213
214    return rc;
215}
216
217#endif /* SDL_VIDEO_DRIVER_X11 */
218
219/* vi: set ts=4 sw=4 expandtab: */