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
22 #include "../../SDL_internal.h"
23
24 #if SDL_VIDEO_DRIVER_KMSDRM
25
26 #define DEBUG_DYNAMIC_KMSDRM 0
27
28 #include "SDL_kmsdrmdyn.h"
29
30
31 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
32
33 #include "SDL_name.h"
34 #include "SDL_loadso.h"
35
36 typedef struct
37 {
38 void *lib;
39 const char *libname;
40 } kmsdrmdynlib;
41
42 #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
43 #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC NULL
44 #endif
45 #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM
46 #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM NULL
47 #endif
48
49 static kmsdrmdynlib kmsdrmlibs[] = {
50 {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM},
51 {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC}
52 };
53
54 static void *
KMSDRM_GetSym(const char * fnname,int * pHasModule)55 KMSDRM_GetSym(const char *fnname, int *pHasModule)
56 {
57 int i;
58 void *fn = NULL;
59 for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
60 if (kmsdrmlibs[i].lib != NULL) {
61 fn = SDL_LoadFunction(kmsdrmlibs[i].lib, fnname);
62 if (fn != NULL)
63 break;
64 }
65 }
66
67 #if DEBUG_DYNAMIC_KMSDRM
68 if (fn != NULL)
69 SDL_Log("KMSDRM: Found '%s' in %s (%p)\n", fnname, kmsdrmlibs[i].libname, fn);
70 else
71 SDL_Log("KMSDRM: Symbol '%s' NOT FOUND!\n", fnname);
72 #endif
73
74 if (fn == NULL)
75 *pHasModule = 0; /* kill this module. */
76
77 return fn;
78 }
79
80 #endif /* SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC */
81
82 /* Define all the function pointers and wrappers... */
83 #define SDL_KMSDRM_MODULE(modname) int SDL_KMSDRM_HAVE_##modname = 0;
84 #define SDL_KMSDRM_SYM(rc,fn,params) SDL_DYNKMSDRMFN_##fn KMSDRM_##fn = NULL;
85 #define SDL_KMSDRM_SYM_CONST(type,name) SDL_DYNKMSDRMCONST_##name KMSDRM_##name = NULL;
86 #include "SDL_kmsdrmsym.h"
87
88 static int kmsdrm_load_refcount = 0;
89
90 void
SDL_KMSDRM_UnloadSymbols(void)91 SDL_KMSDRM_UnloadSymbols(void)
92 {
93 /* Don't actually unload if more than one module is using the libs... */
94 if (kmsdrm_load_refcount > 0) {
95 if (--kmsdrm_load_refcount == 0) {
96 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
97 int i;
98 #endif
99
100 /* set all the function pointers to NULL. */
101 #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 0;
102 #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = NULL;
103 #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = NULL;
104 #include "SDL_kmsdrmsym.h"
105
106
107 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
108 for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
109 if (kmsdrmlibs[i].lib != NULL) {
110 SDL_UnloadObject(kmsdrmlibs[i].lib);
111 kmsdrmlibs[i].lib = NULL;
112 }
113 }
114 #endif
115 }
116 }
117 }
118
119 /* returns non-zero if all needed symbols were loaded. */
120 int
SDL_KMSDRM_LoadSymbols(void)121 SDL_KMSDRM_LoadSymbols(void)
122 {
123 int rc = 1; /* always succeed if not using Dynamic KMSDRM stuff. */
124
125 /* deal with multiple modules needing these symbols... */
126 if (kmsdrm_load_refcount++ == 0) {
127 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
128 int i;
129 int *thismod = NULL;
130 for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
131 if (kmsdrmlibs[i].libname != NULL) {
132 kmsdrmlibs[i].lib = SDL_LoadObject(kmsdrmlibs[i].libname);
133 }
134 }
135
136 #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; /* default yes */
137 #include "SDL_kmsdrmsym.h"
138
139 #define SDL_KMSDRM_MODULE(modname) thismod = &SDL_KMSDRM_HAVE_##modname;
140 #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = (SDL_DYNKMSDRMFN_##fn) KMSDRM_GetSym(#fn,thismod);
141 #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = *(SDL_DYNKMSDRMCONST_##name*) KMSDRM_GetSym(#name,thismod);
142 #include "SDL_kmsdrmsym.h"
143
144 if ((SDL_KMSDRM_HAVE_LIBDRM) && (SDL_KMSDRM_HAVE_GBM)) {
145 /* all required symbols loaded. */
146 SDL_ClearError();
147 } else {
148 /* in case something got loaded... */
149 SDL_KMSDRM_UnloadSymbols();
150 rc = 0;
151 }
152
153 #else /* no dynamic KMSDRM */
154
155 #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; /* default yes */
156 #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = fn;
157 #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = name;
158 #include "SDL_kmsdrmsym.h"
159
160 #endif
161 }
162
163 return rc;
164 }
165
166 #endif /* SDL_VIDEO_DRIVER_KMSDRM */
167
168 /* vi: set ts=4 sw=4 expandtab: */
169