src/video/wayland/SDL_waylanddyn.c

   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_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 #undef SDL_WAYLAND_MODULE
  98 #undef SDL_WAYLAND_SYM
  99 #undef SDL_WAYLAND_INTERFACE
 100
 101 static int wayland_load_refcount = 0;
 102
 103 void
 104 SDL_WAYLAND_UnloadSymbols(void)
 105 {
 106     /* Don't actually unload if more than one module is using the libs... */
 107     if (wayland_load_refcount > 0) {
 108         if (--wayland_load_refcount == 0) {
 109 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
 110             int i;
 111 #endif
 112
 113             /* set all the function pointers to NULL. */
 114 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 0;
 115 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = NULL;
 116 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = NULL;
 117 #include "SDL_waylandsym.h"
 118 #undef SDL_WAYLAND_MODULE
 119 #undef SDL_WAYLAND_SYM
 120 #undef SDL_WAYLAND_INTERFACE
 121
 122
 123 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
 124             for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
 125                 if (waylandlibs[i].lib != NULL) {
 126                     SDL_UnloadObject(waylandlibs[i].lib);
 127                     waylandlibs[i].lib = NULL;
 128                 }
 129             }
 130 #endif
 131         }
 132     }
 133 }
 134
 135 /* returns non-zero if all needed symbols were loaded. */
 136 int
 137 SDL_WAYLAND_LoadSymbols(void)
 138 {
 139     int rc = 1;                 /* always succeed if not using Dynamic WAYLAND stuff. */
 140
 141     /* deal with multiple modules (dga, wayland, etc) needing these symbols... */
 142     if (wayland_load_refcount++ == 0) {
 143 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC
 144         int i;
 145         int *thismod = NULL;
 146         for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) {
 147             if (waylandlibs[i].libname != NULL) {
 148                 waylandlibs[i].lib = SDL_LoadObject(waylandlibs[i].libname);
 149             }
 150         }
 151
 152 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
 153 #define SDL_WAYLAND_SYM(rc,fn,params)
 154 #define SDL_WAYLAND_INTERFACE(iface)
 155 #include "SDL_waylandsym.h"
 156 #undef SDL_WAYLAND_MODULE
 157 #undef SDL_WAYLAND_SYM
 158 #undef SDL_WAYLAND_INTERFACE
 159
 160 #define SDL_WAYLAND_MODULE(modname) thismod = &SDL_WAYLAND_HAVE_##modname;
 161 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn) WAYLAND_GetSym(#fn,thismod);
 162 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = (struct wl_interface *) WAYLAND_GetSym(#iface,thismod);
 163 #include "SDL_waylandsym.h"
 164 #undef SDL_WAYLAND_MODULE
 165 #undef SDL_WAYLAND_SYM
 166 #undef SDL_WAYLAND_INTERFACE
 167
 168         if (SDL_WAYLAND_HAVE_WAYLAND_CLIENT) {
 169             /* all required symbols loaded. */
 170             SDL_ClearError();
 171         } else {
 172             /* in case something got loaded... */
 173             SDL_WAYLAND_UnloadSymbols();
 174             rc = 0;
 175         }
 176
 177 #else  /* no dynamic WAYLAND */
 178
 179 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */
 180 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = fn;
 181 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = &iface;
 182 #include "SDL_waylandsym.h"
 183 #undef SDL_WAYLAND_MODULE
 184 #undef SDL_WAYLAND_SYM
 185 #undef SDL_WAYLAND_INTERFACE
 186
 187 #endif
 188     }
 189
 190     return rc;
 191 }
 192
 193 #endif /* SDL_VIDEO_DRIVER_WAYLAND */
 194
 195 /* vi: set ts=4 sw=4 expandtab: */