SDL  2.0
SDL_kmsdrmdyn.c
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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 
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 #if DEBUG_DYNAMIC_KMSDRM
31 #include "SDL_log.h"
32 #endif
33 
34 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
35 
36 #include "SDL_name.h"
37 #include "SDL_loadso.h"
38 
39 typedef struct
40 {
41  void *lib;
42  const char *libname;
43 } kmsdrmdynlib;
44 
45 #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
46 #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC NULL
47 #endif
48 #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM
49 #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM NULL
50 #endif
51 
52 static kmsdrmdynlib kmsdrmlibs[] = {
53  {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC},
54  {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM}
55 };
56 
57 static void *
58 KMSDRM_GetSym(const char *fnname, int *pHasModule)
59 {
60  int i;
61  void *fn = NULL;
62  for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
63  if (kmsdrmlibs[i].lib != NULL) {
64  fn = SDL_LoadFunction(kmsdrmlibs[i].lib, fnname);
65  if (fn != NULL)
66  break;
67  }
68  }
69 
70 #if DEBUG_DYNAMIC_KMSDRM
71  if (fn != NULL)
72  SDL_Log("KMSDRM: Found '%s' in %s (%p)\n", fnname, kmsdrmlibs[i].libname, fn);
73  else
74  SDL_Log("KMSDRM: Symbol '%s' NOT FOUND!\n", fnname);
75 #endif
76 
77  if (fn == NULL)
78  *pHasModule = 0; /* kill this module. */
79 
80  return fn;
81 }
82 
83 #endif /* SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC */
84 
85 /* Define all the function pointers and wrappers... */
86 #define SDL_KMSDRM_MODULE(modname) int SDL_KMSDRM_HAVE_##modname = 0;
87 #define SDL_KMSDRM_SYM(rc,fn,params) SDL_DYNKMSDRMFN_##fn KMSDRM_##fn = NULL;
88 #define SDL_KMSDRM_SYM_CONST(type,name) SDL_DYNKMSDRMCONST_##name KMSDRM_##name = NULL;
89 #include "SDL_kmsdrmsym.h"
90 
91 static int kmsdrm_load_refcount = 0;
92 
93 void
95 {
96  /* Don't actually unload if more than one module is using the libs... */
97  if (kmsdrm_load_refcount > 0) {
98  if (--kmsdrm_load_refcount == 0) {
99 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
100  int i;
101 #endif
102 
103  /* set all the function pointers to NULL. */
104 #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 0;
105 #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = NULL;
106 #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = NULL;
107 #include "SDL_kmsdrmsym.h"
108 
109 
110 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
111  for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
112  if (kmsdrmlibs[i].lib != NULL) {
113  SDL_UnloadObject(kmsdrmlibs[i].lib);
114  kmsdrmlibs[i].lib = NULL;
115  }
116  }
117 #endif
118  }
119  }
120 }
121 
122 /* returns non-zero if all needed symbols were loaded. */
123 int
125 {
126  int rc = 1; /* always succeed if not using Dynamic KMSDRM stuff. */
127 
128  /* deal with multiple modules needing these symbols... */
129  if (kmsdrm_load_refcount++ == 0) {
130 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
131  int i;
132  int *thismod = NULL;
133  for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
134  if (kmsdrmlibs[i].libname != NULL) {
135  kmsdrmlibs[i].lib = SDL_LoadObject(kmsdrmlibs[i].libname);
136  }
137  }
138 
139 #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; /* default yes */
140 #include "SDL_kmsdrmsym.h"
141 
142 #define SDL_KMSDRM_MODULE(modname) thismod = &SDL_KMSDRM_HAVE_##modname;
143 #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = (SDL_DYNKMSDRMFN_##fn) KMSDRM_GetSym(#fn,thismod);
144 #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = *(SDL_DYNKMSDRMCONST_##name*) KMSDRM_GetSym(#name,thismod);
145 #include "SDL_kmsdrmsym.h"
146 
147  if ((SDL_KMSDRM_HAVE_LIBDRM) && (SDL_KMSDRM_HAVE_GBM)) {
148  /* all required symbols loaded. */
149  SDL_ClearError();
150  } else {
151  /* in case something got loaded... */
153  rc = 0;
154  }
155 
156 #else /* no dynamic KMSDRM */
157 
158 #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; /* default yes */
159 #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = fn;
160 #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = name;
161 #include "SDL_kmsdrmsym.h"
162 
163 #endif
164  }
165 
166  return rc;
167 }
168 
169 #endif /* SDL_VIDEO_DRIVER_KMSDRM */
170 
171 /* vi: set ts=4 sw=4 expandtab: */
#define SDL_ClearError
void SDL_KMSDRM_UnloadSymbols(void)
int SDL_KMSDRM_LoadSymbols(void)
#define SDL_LoadObject
#define SDL_UnloadObject
#define SDL_Log
#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)