SDL  2.0
SDL_mirdyn.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2016 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_MIR
24 
25 #define DEBUG_DYNAMIC_MIR 0
26 
27 #include "SDL_mirdyn.h"
28 
29 #if DEBUG_DYNAMIC_MIR
30 #include "SDL_log.h"
31 #endif
32 
33 #ifdef SDL_VIDEO_DRIVER_MIR_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 } mirdynlib;
43 
44 #ifndef SDL_VIDEO_DRIVER_MIR_DYNAMIC
45 #define SDL_VIDEO_DRIVER_MIR_DYNAMIC NULL
46 #endif
47 #ifndef SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON
48 #define SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON NULL
49 #endif
50 
51 static mirdynlib mirlibs[] = {
52  {NULL, SDL_VIDEO_DRIVER_MIR_DYNAMIC},
53  {NULL, SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON}
54 };
55 
56 static void *
57 MIR_GetSym(const char *fnname, int *pHasModule)
58 {
59  int i;
60  void *fn = NULL;
61  for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) {
62  if (mirlibs[i].lib != NULL) {
63  fn = SDL_LoadFunction(mirlibs[i].lib, fnname);
64  if (fn != NULL)
65  break;
66  }
67  }
68 
69 #if DEBUG_DYNAMIC_MIR
70  if (fn != NULL)
71  SDL_Log("MIR: Found '%s' in %s (%p)\n", fnname, mirlibs[i].libname, fn);
72  else
73  SDL_Log("MIR: Symbol '%s' NOT FOUND!\n", fnname);
74 #endif
75 
76  if (fn == NULL)
77  *pHasModule = 0; /* kill this module. */
78 
79  return fn;
80 }
81 
82 #endif /* SDL_VIDEO_DRIVER_MIR_DYNAMIC */
83 
84 /* Define all the function pointers and wrappers... */
85 #define SDL_MIR_MODULE(modname) int SDL_MIR_HAVE_##modname = 0;
86 #define SDL_MIR_SYM(rc,fn,params) SDL_DYNMIRFN_##fn MIR_##fn = NULL;
87 #include "SDL_mirsym.h"
88 #undef SDL_MIR_MODULE
89 #undef SDL_MIR_SYM
90 
91 static int mir_load_refcount = 0;
92 
93 void
95 {
96  /* Don't actually unload if more than one module is using the libs... */
97  if (mir_load_refcount > 0) {
98  if (--mir_load_refcount == 0) {
99 #ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC
100  int i;
101 #endif
102 
103  /* set all the function pointers to NULL. */
104 #define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 0;
105 #define SDL_MIR_SYM(rc,fn,params) MIR_##fn = NULL;
106 #include "SDL_mirsym.h"
107 #undef SDL_MIR_MODULE
108 #undef SDL_MIR_SYM
109 
110 
111 #ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC
112  for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) {
113  if (mirlibs[i].lib != NULL) {
114  SDL_UnloadObject(mirlibs[i].lib);
115  mirlibs[i].lib = NULL;
116  }
117  }
118 #endif
119  }
120  }
121 }
122 
123 /* returns non-zero if all needed symbols were loaded. */
124 int
126 {
127  int rc = 1; /* always succeed if not using Dynamic MIR stuff. */
128 
129  /* deal with multiple modules (dga, wayland, mir, etc) needing these symbols... */
130  if (mir_load_refcount++ == 0) {
131 #ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC
132  int i;
133  int *thismod = NULL;
134  for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) {
135  if (mirlibs[i].libname != NULL) {
136  mirlibs[i].lib = SDL_LoadObject(mirlibs[i].libname);
137  }
138  }
139 
140 #define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 1; /* default yes */
141 #define SDL_MIR_SYM(rc,fn,params)
142 #include "SDL_mirsym.h"
143 #undef SDL_MIR_MODULE
144 #undef SDL_MIR_SYM
145 
146 #define SDL_MIR_MODULE(modname) thismod = &SDL_MIR_HAVE_##modname;
147 #define SDL_MIR_SYM(rc,fn,params) MIR_##fn = (SDL_DYNMIRFN_##fn) MIR_GetSym(#fn,thismod);
148 #include "SDL_mirsym.h"
149 #undef SDL_MIR_MODULE
150 #undef SDL_MIR_SYM
151 
152  if ((SDL_MIR_HAVE_MIR_CLIENT) && (SDL_MIR_HAVE_XKBCOMMON)) {
153  /* all required symbols loaded. */
154  SDL_ClearError();
155  } else {
156  /* in case something got loaded... */
158  rc = 0;
159  }
160 
161 #else /* no dynamic MIR */
162 
163 #define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 1; /* default yes */
164 #define SDL_MIR_SYM(rc,fn,params) MIR_##fn = fn;
165 #include "SDL_mirsym.h"
166 #undef SDL_MIR_MODULE
167 #undef SDL_MIR_SYM
168 
169 #endif
170  }
171 
172  return rc;
173 }
174 
175 #endif /* SDL_VIDEO_DRIVER_MIR */
176 
177 /* vi: set ts=4 sw=4 expandtab: */
#define SDL_ClearError
#define SDL_LoadObject
#define SDL_UnloadObject
void SDL_MIR_UnloadSymbols(void)
#define SDL_Log
#define SDL_TABLESIZE(table)
Definition: SDL_stdinc.h:94
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:42
#define NULL
Definition: begin_code.h:143
void * SDL_LoadFunction(void *handle, const char *name)
int SDL_MIR_LoadSymbols(void)