SDL  2.0
SDL_x11dyn.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 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_internal.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 
38 typedef 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_XINPUT2
57 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2 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 
69 static x11dynlib x11libs[] = {
72  {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR},
78 };
79 
80 static void *
81 X11_GetSym(const char *fnname, int *pHasModule)
82 {
83  int i;
84  void *fn = NULL;
85  for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
86  if (x11libs[i].lib != NULL) {
87  fn = SDL_LoadFunction(x11libs[i].lib, fnname);
88  if (fn != NULL)
89  break;
90  }
91  }
92 
93 #if DEBUG_DYNAMIC_X11
94  if (fn != NULL)
95  printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, fn);
96  else
97  printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
98 #endif
99 
100  if (fn == NULL)
101  *pHasModule = 0; /* kill this module. */
102 
103  return fn;
104 }
105 
106 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
107 
108 /* Define all the function pointers and wrappers... */
109 #define SDL_X11_SYM(rc,fn,params,args,ret) SDL_DYNX11FN_##fn X11_##fn = NULL;
110 #include "SDL_x11sym.h"
111 
112 /* Annoying varargs entry point... */
113 #ifdef X_HAVE_UTF8_STRING
114 SDL_DYNX11FN_XCreateIC X11_XCreateIC = NULL;
115 SDL_DYNX11FN_XGetICValues X11_XGetICValues = NULL;
116 #endif
117 
118 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
119 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 0;
120 #include "SDL_x11sym.h"
121 
122 static int x11_load_refcount = 0;
123 
124 void
126 {
127  /* Don't actually unload if more than one module is using the libs... */
128  if (x11_load_refcount > 0) {
129  if (--x11_load_refcount == 0) {
130  int i;
131 
132  /* set all the function pointers to NULL. */
133 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 0;
134 #define SDL_X11_SYM(rc,fn,params,args,ret) X11_##fn = NULL;
135 #include "SDL_x11sym.h"
136 
137 #ifdef X_HAVE_UTF8_STRING
138  X11_XCreateIC = NULL;
139  X11_XGetICValues = NULL;
140 #endif
141 
142 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
143  for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
144  if (x11libs[i].lib != NULL) {
145  SDL_UnloadObject(x11libs[i].lib);
146  x11libs[i].lib = NULL;
147  }
148  }
149 #endif
150  }
151  }
152 }
153 
154 /* returns non-zero if all needed symbols were loaded. */
155 int
157 {
158  int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
159 
160  /* deal with multiple modules (dga, x11, etc) needing these symbols... */
161  if (x11_load_refcount++ == 0) {
162 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
163  int i;
164  int *thismod = NULL;
165  for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
166  if (x11libs[i].libname != NULL) {
167  x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
168  }
169  }
170 
171 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
172 #include "SDL_x11sym.h"
173 
174 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
175 #define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = (SDL_DYNX11FN_##fn) X11_GetSym(#fn,thismod);
176 #include "SDL_x11sym.h"
177 
178 #ifdef X_HAVE_UTF8_STRING
179  X11_XCreateIC = (SDL_DYNX11FN_XCreateIC)
180  X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8);
181  X11_XGetICValues = (SDL_DYNX11FN_XGetICValues)
182  X11_GetSym("XGetICValues", &SDL_X11_HAVE_UTF8);
183 #endif
184 
185  if (SDL_X11_HAVE_BASEXLIB) {
186  /* all required symbols loaded. */
187  SDL_ClearError();
188  } else {
189  /* in case something got loaded... */
191  rc = 0;
192  }
193 
194 #else /* no dynamic X11 */
195 
196 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
197 #define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = (SDL_DYNX11FN_##fn) fn;
198 #include "SDL_x11sym.h"
199 
200 #ifdef X_HAVE_UTF8_STRING
201  X11_XCreateIC = XCreateIC;
202  X11_XGetICValues = XGetICValues;
203 #endif
204 #endif
205  }
206 
207  return rc;
208 }
209 
210 #endif /* SDL_VIDEO_DRIVER_X11 */
211 
212 /* vi: set ts=4 sw=4 expandtab: */
#define SDL_ClearError
#define SDL_LoadObject
#define SDL_UnloadObject
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA
int SDL_X11_LoadSymbols(void)
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
#define SDL_TABLESIZE(table)
Definition: SDL_stdinc.h:94
#define SDL_VIDEO_DRIVER_X11_DYNAMIC
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define NULL
Definition: begin_code.h:164
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE
void SDL_X11_UnloadSymbols(void)
void * SDL_LoadFunction(void *handle, const char *name)
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR