SDL  2.0
SDL_waylanddyn.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_WAYLAND
24 
25 #define DEBUG_DYNAMIC_WAYLAND 0
26 
27 #include "SDL_waylanddyn.h"
28 
29 #if DEBUG_DYNAMIC_WAYLAND
30 #include "SDL_log.h"
31 #endif
32 
33 #ifdef SDL_VIDEO_DRIVER_WAYLAND_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 } waylanddynlib;
43 
44 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
45 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC NULL
46 #endif
47 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL
48 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL NULL
49 #endif
50 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR
51 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR NULL
52 #endif
53 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON
54 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON NULL
55 #endif
56 
57 static waylanddynlib waylandlibs[] = {
58  {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC},
59  {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL},
60  {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR},
61  {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON}
62 };
63 
64 static void *
65 WAYLAND_GetSym(const char *fnname, int *pHasModule)
66 {
67  int i;
68  void *fn = NULL;
69  for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
70  if (waylandlibs[i].lib != NULL) {
71  fn = SDL_LoadFunction(waylandlibs[i].lib, fnname);
72  if (fn != NULL)
73  break;
74  }
75  }
76 
77 #if DEBUG_DYNAMIC_WAYLAND
78  if (fn != NULL)
79  SDL_Log("WAYLAND: Found '%s' in %s (%p)\n", fnname, waylandlibs[i].libname, fn);
80  else
81  SDL_Log("WAYLAND: Symbol '%s' NOT FOUND!\n", fnname);
82 #endif
83 
84  if (fn == NULL)
85  *pHasModule = 0; /* kill this module. */
86 
87  return fn;
88 }
89 
90 #endif /* SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC */
91 
92 /* Define all the function pointers and wrappers... */
93 #define SDL_WAYLAND_MODULE(modname) int SDL_WAYLAND_HAVE_##modname = 0;
94 #define SDL_WAYLAND_SYM(rc,fn,params) SDL_DYNWAYLANDFN_##fn WAYLAND_##fn = NULL;
95 #define SDL_WAYLAND_INTERFACE(iface) const struct wl_interface *WAYLAND_##iface = NULL;
96 #include "SDL_waylandsym.h"
97 #undef SDL_WAYLAND_MODULE
98 #undef SDL_WAYLAND_SYM
99 #undef SDL_WAYLAND_INTERFACE
100 
101 static int wayland_load_refcount = 0;
102 
103 void
105 {
106  /* Don't actually unload if more than one module is using the libs... */
107  if (wayland_load_refcount > 0) {
108  if (--wayland_load_refcount == 0) {
109 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
110  int i;
111 #endif
112 
113  /* set all the function pointers to NULL. */
114 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 0;
115 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = NULL;
116 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = NULL;
117 #include "SDL_waylandsym.h"
118 #undef SDL_WAYLAND_MODULE
119 #undef SDL_WAYLAND_SYM
120 #undef SDL_WAYLAND_INTERFACE
121 
122 
123 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
124  for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
125  if (waylandlibs[i].lib != NULL) {
126  SDL_UnloadObject(waylandlibs[i].lib);
127  waylandlibs[i].lib = NULL;
128  }
129  }
130 #endif
131  }
132  }
133 }
134 
135 /* returns non-zero if all needed symbols were loaded. */
136 int
138 {
139  int rc = 1; /* always succeed if not using Dynamic WAYLAND stuff. */
140 
141  /* deal with multiple modules (dga, wayland, etc) needing these symbols... */
142  if (wayland_load_refcount++ == 0) {
143 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
144  int i;
145  int *thismod = NULL;
146  for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
147  if (waylandlibs[i].libname != NULL) {
148  waylandlibs[i].lib = SDL_LoadObject(waylandlibs[i].libname);
149  }
150  }
151 
152 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
153 #define SDL_WAYLAND_SYM(rc,fn,params)
154 #define SDL_WAYLAND_INTERFACE(iface)
155 #include "SDL_waylandsym.h"
156 #undef SDL_WAYLAND_MODULE
157 #undef SDL_WAYLAND_SYM
158 #undef SDL_WAYLAND_INTERFACE
159 
160 #define SDL_WAYLAND_MODULE(modname) thismod = &SDL_WAYLAND_HAVE_##modname;
161 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn) WAYLAND_GetSym(#fn,thismod);
162 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = (struct wl_interface *) WAYLAND_GetSym(#iface,thismod);
163 #include "SDL_waylandsym.h"
164 #undef SDL_WAYLAND_MODULE
165 #undef SDL_WAYLAND_SYM
166 #undef SDL_WAYLAND_INTERFACE
167 
168  if (SDL_WAYLAND_HAVE_WAYLAND_CLIENT) {
169  /* all required symbols loaded. */
170  SDL_ClearError();
171  } else {
172  /* in case something got loaded... */
174  rc = 0;
175  }
176 
177 #else /* no dynamic WAYLAND */
178 
179 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
180 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = fn;
181 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = &iface;
182 #include "SDL_waylandsym.h"
183 #undef SDL_WAYLAND_MODULE
184 #undef SDL_WAYLAND_SYM
185 #undef SDL_WAYLAND_INTERFACE
186 
187 #endif
188  }
189 
190  return rc;
191 }
192 
193 #endif /* SDL_VIDEO_DRIVER_WAYLAND */
194 
195 /* vi: set ts=4 sw=4 expandtab: */
#define SDL_ClearError
void SDL_WAYLAND_UnloadSymbols(void)
#define SDL_LoadObject
#define SDL_UnloadObject
#define SDL_Log
int SDL_WAYLAND_LoadSymbols(void)
#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)