SDL  2.0
SDL_waylanddyn.c
Go to the documentation of this file.
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_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 
98 static int wayland_load_refcount = 0;
99 
100 void
102 {
103  /* Don't actually unload if more than one module is using the libs... */
104  if (wayland_load_refcount > 0) {
105  if (--wayland_load_refcount == 0) {
106 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
107  int i;
108 #endif
109 
110  /* set all the function pointers to NULL. */
111 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 0;
112 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = NULL;
113 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = NULL;
114 #include "SDL_waylandsym.h"
115 
116 
117 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
118  for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
119  if (waylandlibs[i].lib != NULL) {
120  SDL_UnloadObject(waylandlibs[i].lib);
121  waylandlibs[i].lib = NULL;
122  }
123  }
124 #endif
125  }
126  }
127 }
128 
129 /* returns non-zero if all needed symbols were loaded. */
130 int
132 {
133  int rc = 1; /* always succeed if not using Dynamic WAYLAND stuff. */
134 
135  /* deal with multiple modules (dga, wayland, etc) needing these symbols... */
136  if (wayland_load_refcount++ == 0) {
137 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
138  int i;
139  int *thismod = NULL;
140  for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
141  if (waylandlibs[i].libname != NULL) {
142  waylandlibs[i].lib = SDL_LoadObject(waylandlibs[i].libname);
143  }
144  }
145 
146 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
147 #include "SDL_waylandsym.h"
148 
149 #define SDL_WAYLAND_MODULE(modname) thismod = &SDL_WAYLAND_HAVE_##modname;
150 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn) WAYLAND_GetSym(#fn,thismod);
151 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = (struct wl_interface *) WAYLAND_GetSym(#iface,thismod);
152 #include "SDL_waylandsym.h"
153 
154  if (SDL_WAYLAND_HAVE_WAYLAND_CLIENT) {
155  /* all required symbols loaded. */
156  SDL_ClearError();
157  } else {
158  /* in case something got loaded... */
160  rc = 0;
161  }
162 
163 #else /* no dynamic WAYLAND */
164 
165 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
166 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = fn;
167 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = &iface;
168 #include "SDL_waylandsym.h"
169 
170 #endif
171  }
172 
173  return rc;
174 }
175 
176 #endif /* SDL_VIDEO_DRIVER_WAYLAND */
177 
178 /* 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:50
#define NULL
Definition: begin_code.h:164
void * SDL_LoadFunction(void *handle, const char *name)