src/video/mir/SDL_mirdyn.c
changeset 12391 ca6e41ade79a
parent 12390 60f322c5984f
child 12392 046dcbdbaa74
equal deleted inserted replaced
12390:60f322c5984f 12391:ca6e41ade79a
     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 #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 *
       
    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
       
    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
       
   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: */