SDL  2.0
SDL_x11dyn.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2020 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_XEXT
45 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
46 #endif
47 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR
48 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR NULL
49 #endif
50 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA
51 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA NULL
52 #endif
53 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
54 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2 NULL
55 #endif
56 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
57 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
58 #endif
59 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
60 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS NULL
61 #endif
62 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE
63 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE NULL
64 #endif
65 
66 static x11dynlib x11libs[] = {
69  {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR},
75 };
76 
77 static void *
78 X11_GetSym(const char *fnname, int *pHasModule)
79 {
80  int i;
81  void *fn = NULL;
82  for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
83  if (x11libs[i].lib != NULL) {
84  fn = SDL_LoadFunction(x11libs[i].lib, fnname);
85  if (fn != NULL)
86  break;
87  }
88  }
89 
90 #if DEBUG_DYNAMIC_X11
91  if (fn != NULL)
92  printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, fn);
93  else
94  printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
95 #endif
96 
97  if (fn == NULL)
98  *pHasModule = 0; /* kill this module. */
99 
100  return fn;
101 }
102 
103 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
104 
105 /* Define all the function pointers and wrappers... */
106 #define SDL_X11_SYM(rc,fn,params,args,ret) SDL_DYNX11FN_##fn X11_##fn = NULL;
107 #include "SDL_x11sym.h"
108 
109 /* Annoying varargs entry point... */
110 #ifdef X_HAVE_UTF8_STRING
111 SDL_DYNX11FN_XCreateIC X11_XCreateIC = NULL;
112 SDL_DYNX11FN_XGetICValues X11_XGetICValues = NULL;
113 #endif
114 
115 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
116 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 0;
117 #include "SDL_x11sym.h"
118 
119 static int x11_load_refcount = 0;
120 
121 void
123 {
124  /* Don't actually unload if more than one module is using the libs... */
125  if (x11_load_refcount > 0) {
126  if (--x11_load_refcount == 0) {
127  int i;
128 
129  /* set all the function pointers to NULL. */
130 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 0;
131 #define SDL_X11_SYM(rc,fn,params,args,ret) X11_##fn = NULL;
132 #include "SDL_x11sym.h"
133 
134 #ifdef X_HAVE_UTF8_STRING
135  X11_XCreateIC = NULL;
136  X11_XGetICValues = NULL;
137 #endif
138 
139 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
140  for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
141  if (x11libs[i].lib != NULL) {
142  SDL_UnloadObject(x11libs[i].lib);
143  x11libs[i].lib = NULL;
144  }
145  }
146 #endif
147  }
148  }
149 }
150 
151 /* returns non-zero if all needed symbols were loaded. */
152 int
154 {
155  int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
156 
157  /* deal with multiple modules (dga, x11, etc) needing these symbols... */
158  if (x11_load_refcount++ == 0) {
159 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
160  int i;
161  int *thismod = NULL;
162  for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
163  if (x11libs[i].libname != NULL) {
164  x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
165  }
166  }
167 
168 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
169 #include "SDL_x11sym.h"
170 
171 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
172 #define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = (SDL_DYNX11FN_##fn) X11_GetSym(#fn,thismod);
173 #include "SDL_x11sym.h"
174 
175 #ifdef X_HAVE_UTF8_STRING
176  X11_XCreateIC = (SDL_DYNX11FN_XCreateIC)
177  X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8);
178  X11_XGetICValues = (SDL_DYNX11FN_XGetICValues)
179  X11_GetSym("XGetICValues", &SDL_X11_HAVE_UTF8);
180 #endif
181 
182  if (SDL_X11_HAVE_BASEXLIB) {
183  /* all required symbols loaded. */
184  SDL_ClearError();
185  } else {
186  /* in case something got loaded... */
188  rc = 0;
189  }
190 
191 #else /* no dynamic X11 */
192 
193 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
194 #define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = (SDL_DYNX11FN_##fn) fn;
195 #include "SDL_x11sym.h"
196 
197 #ifdef X_HAVE_UTF8_STRING
198  X11_XCreateIC = XCreateIC;
199  X11_XGetICValues = XGetICValues;
200 #endif
201 #endif
202  }
203 
204  return rc;
205 }
206 
207 #endif /* SDL_VIDEO_DRIVER_X11 */
208 
209 /* vi: set ts=4 sw=4 expandtab: */
SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA
Definition: SDL_config_macosx.h:165
SDL_ClearError
#define SDL_ClearError
Definition: SDL_dynapi_overrides.h:114
NULL
#define NULL
Definition: begin_code.h:167
SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
Definition: SDL_config_macosx.h:166
SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE
Definition: SDL_config_macosx.h:169
SDL_X11_LoadSymbols
int SDL_X11_LoadSymbols(void)
SDL_UnloadObject
#define SDL_UnloadObject
Definition: SDL_dynapi_overrides.h:234
SDL_VIDEO_DRIVER_X11_DYNAMIC
#define SDL_VIDEO_DRIVER_X11_DYNAMIC
Definition: SDL_config_macosx.h:163
SDL_name.h
SDL_X11_UnloadSymbols
void SDL_X11_UnloadSymbols(void)
SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
Definition: SDL_config_macosx.h:167
SDL_LoadObject
#define SDL_LoadObject
Definition: SDL_dynapi_overrides.h:232
SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
Definition: SDL_config_macosx.h:168
SDL_TABLESIZE
#define SDL_TABLESIZE(table)
Definition: SDL_stdinc.h:116
SDL_x11dyn.h
SDL_LoadFunction
void * SDL_LoadFunction(void *handle, const char *name)
SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
Definition: SDL_config_macosx.h:164
SDL_loadso.h
SDL_x11sym.h
i
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