src/video/wayland/SDL_waylanddyn.c
author Gabriel Jacobo <gabomdq@gmail.com>
Thu, 09 Jan 2014 13:56:21 -0300
changeset 8104 2e4f1bd21196
child 8149 681eb46b8ac4
permissions -rw-r--r--
Dynamic loading support for Wayland
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2013 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: */