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comparison src/video/x11/SDL_x11dyn.c @ 1950:a344e42bce3b

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Started work on the new X11 driver.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 26 Jul 2006 06:34:54 +0000
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children 238db749017a
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1949:44b6f09a07d8 1950:a344e42bce3b
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 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC},
58 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT},
59 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER},
60 {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR},
61 };
62
63 static void
64 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 *fn = SDL_LoadFunction(x11libs[i].lib, fnname);
70 if (*fn != NULL)
71 break;
72 }
73 }
74
75 #if DEBUG_DYNAMIC_X11
76 if (*fn != NULL)
77 printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname,
78 *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 #endif
102
103 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
104 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
105 #define SDL_X11_SYM(rc,fn,params,args,ret)
106 #include "SDL_x11sym.h"
107 #undef SDL_X11_MODULE
108 #undef SDL_X11_SYM
109
110
111 static int x11_load_refcount = 0;
112
113 void
114 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 #endif
132
133 for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
134 if (x11libs[i].lib != NULL) {
135 SDL_UnloadObject(x11libs[i].lib);
136 x11libs[i].lib = NULL;
137 }
138 }
139 }
140 }
141 #endif
142 }
143
144 /* returns non-zero if all needed symbols were loaded. */
145 int
146 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 #endif
169
170 if (!SDL_X11_HAVE_BASEXLIB) { /* some required symbol didn't load. */
171 SDL_X11_UnloadSymbols(); /* in case something got loaded... */
172 rc = 0;
173 }
174 }
175 #else
176 #ifdef X_HAVE_UTF8_STRING
177 pXCreateIC = XCreateIC;
178 #endif
179 #endif
180
181 return rc;
182 }
183
184 /* vi: set ts=4 sw=4 expandtab: */