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FORK: Simple Directmedia Layer
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SDL_DirectFB_dyn.c (3654B)

      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 #include "../../SDL_internal.h"
     22 
     23 #if SDL_VIDEO_DRIVER_DIRECTFB
     24 
     25 #include "SDL_DirectFB_video.h"
     26 #include "SDL_DirectFB_dyn.h"
     27 
     28 #ifdef SDL_VIDEO_DRIVER_DIRECTFB_DYNAMIC
     29 #include "SDL_name.h"
     30 #include "SDL_loadso.h"
     31 
     32 #define DFB_SYM(ret, name, args, al, func) ret (*name) args;
     33 static struct _SDL_DirectFB_Symbols
     34 {
     35     DFB_SYMS
     36     const unsigned int *directfb_major_version;
     37     const unsigned int *directfb_minor_version;
     38     const unsigned int *directfb_micro_version;
     39 } SDL_DirectFB_Symbols;
     40 #undef DFB_SYM
     41 
     42 #define DFB_SYM(ret, name, args, al, func) ret name args { func SDL_DirectFB_Symbols.name al  ; }
     43 DFB_SYMS
     44 #undef DFB_SYM
     45 
     46 static void *handle = NULL;
     47 
     48 int
     49 SDL_DirectFB_LoadLibrary(void)
     50 {
     51     int retval = 0;
     52 
     53     if (handle == NULL) {
     54         handle = SDL_LoadObject(SDL_VIDEO_DRIVER_DIRECTFB_DYNAMIC);
     55         if (handle != NULL) {
     56             retval = 1;
     57 #define DFB_SYM(ret, name, args, al, func) if (!(SDL_DirectFB_Symbols.name = SDL_LoadFunction(handle, # name))) retval = 0;
     58             DFB_SYMS
     59 #undef DFB_SYM
     60             if (!
     61                     (SDL_DirectFB_Symbols.directfb_major_version =
     62                      SDL_LoadFunction(handle, "directfb_major_version")))
     63                 retval = 0;
     64             if (!
     65                 (SDL_DirectFB_Symbols.directfb_minor_version =
     66                  SDL_LoadFunction(handle, "directfb_minor_version")))
     67                 retval = 0;
     68             if (!
     69                 (SDL_DirectFB_Symbols.directfb_micro_version =
     70                  SDL_LoadFunction(handle, "directfb_micro_version")))
     71                 retval = 0;
     72         }
     73     }
     74     if (retval) {
     75         const char *stemp = DirectFBCheckVersion(DIRECTFB_MAJOR_VERSION,
     76                                                  DIRECTFB_MINOR_VERSION,
     77                                                  DIRECTFB_MICRO_VERSION);
     78         /* Version Check */
     79         if (stemp != NULL) {
     80             fprintf(stderr,
     81                     "DirectFB Lib: Version mismatch. Compiled: %d.%d.%d Library %d.%d.%d\n",
     82                     DIRECTFB_MAJOR_VERSION, DIRECTFB_MINOR_VERSION,
     83                     DIRECTFB_MICRO_VERSION,
     84                     *SDL_DirectFB_Symbols.directfb_major_version,
     85                     *SDL_DirectFB_Symbols.directfb_minor_version,
     86                     *SDL_DirectFB_Symbols.directfb_micro_version);
     87             retval = 0;
     88         }
     89     }
     90     if (!retval)
     91         SDL_DirectFB_UnLoadLibrary();
     92     return retval;
     93 }
     94 
     95 void
     96 SDL_DirectFB_UnLoadLibrary(void)
     97 {
     98     if (handle != NULL) {
     99         SDL_UnloadObject(handle);
    100         handle = NULL;
    101     }
    102 }
    103 
    104 #else
    105 int
    106 SDL_DirectFB_LoadLibrary(void)
    107 {
    108     return 1;
    109 }
    110 
    111 void
    112 SDL_DirectFB_UnLoadLibrary(void)
    113 {
    114 }
    115 #endif
    116 
    117 #endif /* SDL_VIDEO_DRIVER_DIRECTFB */