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_WAYLAND
24
25 #define DEBUG_DYNAMIC_WAYLAND 0
26
27 #include "SDL_waylanddyn.h"
28
29
30 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
31
32 #include "SDL_name.h"
33 #include "SDL_loadso.h"
34
35 typedef struct
36 {
37 void *lib;
38 const char *libname;
39 } waylanddynlib;
40
41 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL
42 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL NULL
43 #endif
44 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR
45 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR NULL
46 #endif
47 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON
48 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON NULL
49 #endif
50
51 static waylanddynlib waylandlibs[] = {
52 {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC},
53 {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL},
54 {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR},
55 {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON}
56 };
57
58 static void *
WAYLAND_GetSym(const char * fnname,int * pHasModule)59 WAYLAND_GetSym(const char *fnname, int *pHasModule)
60 {
61 int i;
62 void *fn = NULL;
63 for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
64 if (waylandlibs[i].lib != NULL) {
65 fn = SDL_LoadFunction(waylandlibs[i].lib, fnname);
66 if (fn != NULL)
67 break;
68 }
69 }
70
71 #if DEBUG_DYNAMIC_WAYLAND
72 if (fn != NULL)
73 SDL_Log("WAYLAND: Found '%s' in %s (%p)\n", fnname, waylandlibs[i].libname, fn);
74 else
75 SDL_Log("WAYLAND: Symbol '%s' NOT FOUND!\n", fnname);
76 #endif
77
78 if (fn == NULL)
79 *pHasModule = 0; /* kill this module. */
80
81 return fn;
82 }
83
84 #endif /* SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC */
85
86 /* Define all the function pointers and wrappers... */
87 #define SDL_WAYLAND_MODULE(modname) int SDL_WAYLAND_HAVE_##modname = 0;
88 #define SDL_WAYLAND_SYM(rc,fn,params) SDL_DYNWAYLANDFN_##fn WAYLAND_##fn = NULL;
89 #define SDL_WAYLAND_INTERFACE(iface) const struct wl_interface *WAYLAND_##iface = NULL;
90 #include "SDL_waylandsym.h"
91
92 static int wayland_load_refcount = 0;
93
94 void
SDL_WAYLAND_UnloadSymbols(void)95 SDL_WAYLAND_UnloadSymbols(void)
96 {
97 /* Don't actually unload if more than one module is using the libs... */
98 if (wayland_load_refcount > 0) {
99 if (--wayland_load_refcount == 0) {
100 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
101 int i;
102 #endif
103
104 /* set all the function pointers to NULL. */
105 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 0;
106 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = NULL;
107 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = NULL;
108 #include "SDL_waylandsym.h"
109
110
111 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
112 for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
113 if (waylandlibs[i].lib != NULL) {
114 SDL_UnloadObject(waylandlibs[i].lib);
115 waylandlibs[i].lib = NULL;
116 }
117 }
118 #endif
119 }
120 }
121 }
122
123 /* returns non-zero if all needed symbols were loaded. */
124 int
SDL_WAYLAND_LoadSymbols(void)125 SDL_WAYLAND_LoadSymbols(void)
126 {
127 int rc = 1; /* always succeed if not using Dynamic WAYLAND stuff. */
128
129 /* deal with multiple modules (dga, wayland, etc) needing these symbols... */
130 if (wayland_load_refcount++ == 0) {
131 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
132 int i;
133 int *thismod = NULL;
134 for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
135 if (waylandlibs[i].libname != NULL) {
136 waylandlibs[i].lib = SDL_LoadObject(waylandlibs[i].libname);
137 }
138 }
139
140 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
141 #include "SDL_waylandsym.h"
142
143 #define SDL_WAYLAND_MODULE(modname) thismod = &SDL_WAYLAND_HAVE_##modname;
144 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn) WAYLAND_GetSym(#fn,thismod);
145 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = (struct wl_interface *) WAYLAND_GetSym(#iface,thismod);
146 #include "SDL_waylandsym.h"
147
148 if (SDL_WAYLAND_HAVE_WAYLAND_CLIENT) {
149 /* all required symbols loaded. */
150 SDL_ClearError();
151 } else {
152 /* in case something got loaded... */
153 SDL_WAYLAND_UnloadSymbols();
154 rc = 0;
155 }
156
157 #else /* no dynamic WAYLAND */
158
159 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
160 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = fn;
161 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = &iface;
162 #include "SDL_waylandsym.h"
163
164 #endif
165 }
166
167 return rc;
168 }
169
170 #endif /* SDL_VIDEO_DRIVER_WAYLAND */
171
172 /* vi: set ts=4 sw=4 expandtab: */
173