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FORK: Simple Directmedia Layer
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SDL_kmsdrmdyn.c (5149B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      4   Atomic KMSDRM backend by Manuel Alfayate Corchete <redwindwanderer@gmail.com>
      5 
      6   This software is provided 'as-is', without any express or implied
      7   warranty.  In no event will the authors be held liable for any damages
      8   arising from the use of this software.
      9 
     10   Permission is granted to anyone to use this software for any purpose,
     11   including commercial applications, and to alter it and redistribute it
     12   freely, subject to the following restrictions:
     13 
     14   1. The origin of this software must not be misrepresented; you must not
     15      claim that you wrote the original software. If you use this software
     16      in a product, an acknowledgment in the product documentation would be
     17      appreciated but is not required.
     18   2. Altered source versions must be plainly marked as such, and must not be
     19      misrepresented as being the original software.
     20   3. This notice may not be removed or altered from any source distribution.
     21 */
     22 
     23 #include "../../SDL_internal.h"
     24 
     25 #if SDL_VIDEO_DRIVER_KMSDRM
     26 
     27 #define DEBUG_DYNAMIC_KMSDRM 0
     28 
     29 #include "SDL_kmsdrmdyn.h"
     30 
     31 
     32 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
     33 
     34 #include "SDL_name.h"
     35 #include "SDL_loadso.h"
     36 
     37 typedef struct
     38 {
     39     void *lib;
     40     const char *libname;
     41 } kmsdrmdynlib;
     42 
     43 #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
     44 #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC NULL
     45 #endif
     46 #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM
     47 #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM NULL
     48 #endif
     49 
     50 static kmsdrmdynlib kmsdrmlibs[] = {
     51     {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM},
     52     {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC}
     53 };
     54 
     55 static void *
     56 KMSDRM_GetSym(const char *fnname, int *pHasModule)
     57 {
     58     int i;
     59     void *fn = NULL;
     60     for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
     61         if (kmsdrmlibs[i].lib != NULL) {
     62             fn = SDL_LoadFunction(kmsdrmlibs[i].lib, fnname);
     63             if (fn != NULL)
     64                 break;
     65         }
     66     }
     67 
     68 #if DEBUG_DYNAMIC_KMSDRM
     69     if (fn != NULL)
     70         SDL_Log("KMSDRM: Found '%s' in %s (%p)\n", fnname, kmsdrmlibs[i].libname, fn);
     71     else
     72         SDL_Log("KMSDRM: Symbol '%s' NOT FOUND!\n", fnname);
     73 #endif
     74 
     75     if (fn == NULL)
     76         *pHasModule = 0;  /* kill this module. */
     77 
     78     return fn;
     79 }
     80 
     81 #endif /* SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC */
     82 
     83 /* Define all the function pointers and wrappers... */
     84 #define SDL_KMSDRM_MODULE(modname) int SDL_KMSDRM_HAVE_##modname = 0;
     85 #define SDL_KMSDRM_SYM(rc,fn,params) SDL_DYNKMSDRMFN_##fn KMSDRM_##fn = NULL;
     86 #define SDL_KMSDRM_SYM_CONST(type,name) SDL_DYNKMSDRMCONST_##name KMSDRM_##name = NULL;
     87 #include "SDL_kmsdrmsym.h"
     88 
     89 static int kmsdrm_load_refcount = 0;
     90 
     91 void
     92 SDL_KMSDRM_UnloadSymbols(void)
     93 {
     94     /* Don't actually unload if more than one module is using the libs... */
     95     if (kmsdrm_load_refcount > 0) {
     96         if (--kmsdrm_load_refcount == 0) {
     97 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
     98             int i;
     99 #endif
    100 
    101             /* set all the function pointers to NULL. */
    102 #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 0;
    103 #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = NULL;
    104 #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = NULL;
    105 #include "SDL_kmsdrmsym.h"
    106 
    107 
    108 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
    109             for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
    110                 if (kmsdrmlibs[i].lib != NULL) {
    111                     SDL_UnloadObject(kmsdrmlibs[i].lib);
    112                     kmsdrmlibs[i].lib = NULL;
    113                 }
    114             }
    115 #endif
    116         }
    117     }
    118 }
    119 
    120 /* returns non-zero if all needed symbols were loaded. */
    121 int
    122 SDL_KMSDRM_LoadSymbols(void)
    123 {
    124     int rc = 1;                 /* always succeed if not using Dynamic KMSDRM stuff. */
    125 
    126     /* deal with multiple modules needing these symbols... */
    127     if (kmsdrm_load_refcount++ == 0) {
    128 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
    129         int i;
    130         int *thismod = NULL;
    131         for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
    132             if (kmsdrmlibs[i].libname != NULL) {
    133                 kmsdrmlibs[i].lib = SDL_LoadObject(kmsdrmlibs[i].libname);
    134             }
    135         }
    136 
    137 #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; /* default yes */
    138 #include "SDL_kmsdrmsym.h"
    139 
    140 #define SDL_KMSDRM_MODULE(modname) thismod = &SDL_KMSDRM_HAVE_##modname;
    141 #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = (SDL_DYNKMSDRMFN_##fn) KMSDRM_GetSym(#fn,thismod);
    142 #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = *(SDL_DYNKMSDRMCONST_##name*) KMSDRM_GetSym(#name,thismod);
    143 #include "SDL_kmsdrmsym.h"
    144 
    145         if ((SDL_KMSDRM_HAVE_LIBDRM) && (SDL_KMSDRM_HAVE_GBM)) {
    146             /* all required symbols loaded. */
    147             SDL_ClearError();
    148         } else {
    149             /* in case something got loaded... */
    150             SDL_KMSDRM_UnloadSymbols();
    151             rc = 0;
    152         }
    153 
    154 #else  /* no dynamic KMSDRM */
    155 
    156 #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; /* default yes */
    157 #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = fn;
    158 #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = name;
    159 #include "SDL_kmsdrmsym.h"
    160 
    161 #endif
    162     }
    163 
    164     return rc;
    165 }
    166 
    167 #endif /* SDL_VIDEO_DRIVER_KMSDRM */
    168 
    169 /* vi: set ts=4 sw=4 expandtab: */