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 *
MIR_GetSym(const char * fnname,int * pHasModule)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 #define SDL_MIR_SYM_CONST(type,name) SDL_DYMMIRCONST_##name MIR_##name = NULL;
88 #include "SDL_mirsym.h"
89
90 static int mir_load_refcount = 0;
91
92 void
SDL_MIR_UnloadSymbols(void)93 SDL_MIR_UnloadSymbols(void)
94 {
95 /* Don't actually unload if more than one module is using the libs... */
96 if (mir_load_refcount > 0) {
97 if (--mir_load_refcount == 0) {
98 #ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC
99 int i;
100 #endif
101
102 /* set all the function pointers to NULL. */
103 #define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 0;
104 #define SDL_MIR_SYM(rc,fn,params) MIR_##fn = NULL;
105 #define SDL_MIR_SYM_CONST(type,name) MIR_##name = NULL;
106 #include "SDL_mirsym.h"
107
108
109 #ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC
110 for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) {
111 if (mirlibs[i].lib != NULL) {
112 SDL_UnloadObject(mirlibs[i].lib);
113 mirlibs[i].lib = NULL;
114 }
115 }
116 #endif
117 }
118 }
119 }
120
121 /* returns non-zero if all needed symbols were loaded. */
122 int
SDL_MIR_LoadSymbols(void)123 SDL_MIR_LoadSymbols(void)
124 {
125 int rc = 1; /* always succeed if not using Dynamic MIR stuff. */
126
127 /* deal with multiple modules (dga, wayland, mir, etc) needing these symbols... */
128 if (mir_load_refcount++ == 0) {
129 #ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC
130 int i;
131 int *thismod = NULL;
132 for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) {
133 if (mirlibs[i].libname != NULL) {
134 mirlibs[i].lib = SDL_LoadObject(mirlibs[i].libname);
135 }
136 }
137
138 #define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 1; /* default yes */
139 #include "SDL_mirsym.h"
140
141 #define SDL_MIR_MODULE(modname) thismod = &SDL_MIR_HAVE_##modname;
142 #define SDL_MIR_SYM(rc,fn,params) MIR_##fn = (SDL_DYNMIRFN_##fn) MIR_GetSym(#fn,thismod);
143 #define SDL_MIR_SYM_CONST(type,name) MIR_##name = *(SDL_DYMMIRCONST_##name*) MIR_GetSym(#name,thismod);
144 #include "SDL_mirsym.h"
145
146 if ((SDL_MIR_HAVE_MIR_CLIENT) && (SDL_MIR_HAVE_XKBCOMMON)) {
147 /* all required symbols loaded. */
148 SDL_ClearError();
149 } else {
150 /* in case something got loaded... */
151 SDL_MIR_UnloadSymbols();
152 rc = 0;
153 }
154
155 #else /* no dynamic MIR */
156
157 #define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 1; /* default yes */
158 #define SDL_MIR_SYM(rc,fn,params) MIR_##fn = fn;
159 #define SDL_MIR_SYM_CONST(type,name) MIR_##name = name;
160 #include "SDL_mirsym.h"
161
162 #endif
163 }
164
165 return rc;
166 }
167
168 #endif /* SDL_VIDEO_DRIVER_MIR */
169
170 /* vi: set ts=4 sw=4 expandtab: */
171