1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2004 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #define DEBUG_DYNAMIC_X11 0
25
26 #include "SDL_x11dyn.h"
27
28 #if DEBUG_DYNAMIC_X11
29 #include <stdio.h>
30 #endif
31
32 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
33
34 #include "SDL_name.h"
35 #include "SDL_loadso.h"
36
37 typedef struct
38 {
39 void *lib;
40 const char *libname;
41 } x11dynlib;
42
43 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC
44 #define SDL_VIDEO_DRIVER_X11_DYNAMIC NULL
45 #endif
46 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
47 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
48 #endif
49 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER
50 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER NULL
51 #endif
52 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
53 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
54 #endif
55
56 static x11dynlib x11libs[] =
57 {
58 { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC },
59 { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT },
60 { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER },
61 { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR },
62 };
63
X11_GetSym(const char * fnname,int * rc,void ** fn)64 static void X11_GetSym(const char *fnname, int *rc, void **fn)
65 {
66 int i;
67 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
68 if (x11libs[i].lib != NULL)
69 {
70 *fn = SDL_LoadFunction(x11libs[i].lib, fnname);
71 if (*fn != NULL)
72 break;
73 }
74 }
75
76 #if DEBUG_DYNAMIC_X11
77 if (*fn != NULL)
78 printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, *fn);
79 else
80 printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
81 #endif
82
83 if (*fn == NULL)
84 *rc = 0; /* kill this module. */
85 }
86
87
88 /* Define all the function pointers and wrappers... */
89 #define SDL_X11_MODULE(modname)
90 #define SDL_X11_SYM(rc,fn,params,args,ret) \
91 static rc (*p##fn) params = NULL; \
92 rc fn params { ret p##fn args ; }
93 #include "SDL_x11sym.h"
94 #undef SDL_X11_MODULE
95 #undef SDL_X11_SYM
96 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
97
98 /* Annoying varargs entry point... */
99 #ifdef X_HAVE_UTF8_STRING
100 XIC (*pXCreateIC)(XIM,...) = NULL;
101 char *(*pXGetICValues)(XIC, ...) = NULL;
102 #endif
103
104 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
105 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
106 #define SDL_X11_SYM(rc,fn,params,args,ret)
107 #include "SDL_x11sym.h"
108 #undef SDL_X11_MODULE
109 #undef SDL_X11_SYM
110
111
112 static int x11_load_refcount = 0;
113
SDL_X11_UnloadSymbols(void)114 void SDL_X11_UnloadSymbols(void)
115 {
116 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
117 /* Don't actually unload if more than one module is using the libs... */
118 if (x11_load_refcount > 0) {
119 if (--x11_load_refcount == 0) {
120 int i;
121
122 /* set all the function pointers to NULL. */
123 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1;
124 #define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
125 #include "SDL_x11sym.h"
126 #undef SDL_X11_MODULE
127 #undef SDL_X11_SYM
128
129 #ifdef X_HAVE_UTF8_STRING
130 pXCreateIC = NULL;
131 pXGetICValues = NULL;
132 #endif
133
134 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
135 if (x11libs[i].lib != NULL) {
136 SDL_UnloadObject(x11libs[i].lib);
137 x11libs[i].lib = NULL;
138 }
139 }
140 }
141 }
142 #endif
143 }
144
145 /* returns non-zero if all needed symbols were loaded. */
SDL_X11_LoadSymbols(void)146 int SDL_X11_LoadSymbols(void)
147 {
148 int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
149
150 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
151 /* deal with multiple modules (dga, x11, etc) needing these symbols... */
152 if (x11_load_refcount++ == 0) {
153 int i;
154 int *thismod = NULL;
155 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
156 if (x11libs[i].libname != NULL) {
157 x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
158 }
159 }
160 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
161 #define SDL_X11_SYM(a,fn,x,y,z) X11_GetSym(#fn,thismod,(void**)&p##fn);
162 #include "SDL_x11sym.h"
163 #undef SDL_X11_MODULE
164 #undef SDL_X11_SYM
165
166 #ifdef X_HAVE_UTF8_STRING
167 X11_GetSym("XCreateIC",&SDL_X11_HAVE_UTF8,(void **)&pXCreateIC);
168 X11_GetSym("XGetICValues",&SDL_X11_HAVE_UTF8,(void **)&pXGetICValues);
169 #endif
170
171 if (SDL_X11_HAVE_BASEXLIB) { /* all required symbols loaded. */
172 SDL_ClearError();
173 } else {
174 SDL_X11_UnloadSymbols(); /* in case something got loaded... */
175 rc = 0;
176 }
177 }
178 #else
179 #if DEBUG_DYNAMIC_X11
180 printf("X11: No dynamic X11 support in this build of SDL.\n");
181 #endif
182 #ifdef X_HAVE_UTF8_STRING
183 pXCreateIC = XCreateIC;
184 pXGetICValues = XGetICValues;
185 #endif
186 #endif
187
188 return rc;
189 }
190
191 /* end of SDL_x11dyn.c ... */
192
193