kc3-lang/SDL/src/video/kmsdrm/SDL_kmsdrmdyn.c

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• Hash : b2449473
  Author :
  Date : 2021-01-08T18:57:12
  

  [KMS/DRM] Go back to the LEGACY interface only because using planes breaks compatibility with HW, so no advantage on using ATOMIC.

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• src/video/kmsdrm/SDL_kmsdrmdyn.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  
  #include "../../SDL_internal.h"
  
  #if SDL_VIDEO_DRIVER_KMSDRM
  
  #define DEBUG_DYNAMIC_KMSDRM 0
  
  #include "SDL_kmsdrmdyn.h"
  
  #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
  
  #include "SDL_name.h"
  #include "SDL_loadso.h"
  
  typedef struct
  {
      void *lib;
      const char *libname;
  } kmsdrmdynlib;
  
  #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
  #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC NULL
  #endif
  #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM
  #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM NULL
  #endif
  
  static kmsdrmdynlib kmsdrmlibs[] = {
      {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM},
      {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC}
  };
  
  static void *
  KMSDRM_GetSym(const char *fnname, int *pHasModule)
  {
      int i;
      void *fn = NULL;
      for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
          if (kmsdrmlibs[i].lib != NULL) {
              fn = SDL_LoadFunction(kmsdrmlibs[i].lib, fnname);
              if (fn != NULL)
                  break;
          }
      }
  
  #if DEBUG_DYNAMIC_KMSDRM
      if (fn != NULL)
          SDL_Log("KMSDRM: Found '%s' in %s (%p)\n", fnname, kmsdrmlibs[i].libname, fn);
      else
          SDL_Log("KMSDRM: Symbol '%s' NOT FOUND!\n", fnname);
  #endif
  
      if (fn == NULL)
          *pHasModule = 0;  /* kill this module. */
  
      return fn;
  }
  
  #endif /* SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC */
  
  /* Define all the function pointers and wrappers... */
  #define SDL_KMSDRM_MODULE(modname) int SDL_KMSDRM_HAVE_##modname = 0;
  #define SDL_KMSDRM_SYM(rc,fn,params) SDL_DYNKMSDRMFN_##fn KMSDRM_##fn = NULL;
  #define SDL_KMSDRM_SYM_CONST(type,name) SDL_DYNKMSDRMCONST_##name KMSDRM_##name = NULL;
  #include "SDL_kmsdrmsym.h"
  
  static int kmsdrm_load_refcount = 0;
  
  void
  SDL_KMSDRM_UnloadSymbols(void)
  {
      /* Don't actually unload if more than one module is using the libs... */
      if (kmsdrm_load_refcount > 0) {
          if (--kmsdrm_load_refcount == 0) {
  #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
              int i;
  #endif
  
              /* set all the function pointers to NULL. */
  #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 0;
  #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = NULL;
  #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = NULL;
  #include "SDL_kmsdrmsym.h"
  
  
  #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
              for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
                  if (kmsdrmlibs[i].lib != NULL) {
                      SDL_UnloadObject(kmsdrmlibs[i].lib);
                      kmsdrmlibs[i].lib = NULL;
                  }
              }
  #endif
          }
      }
  }
  
  /* returns non-zero if all needed symbols were loaded. */
  int
  SDL_KMSDRM_LoadSymbols(void)
  {
      int rc = 1;                 /* always succeed if not using Dynamic KMSDRM stuff. */
  
      /* deal with multiple modules needing these symbols... */
      if (kmsdrm_load_refcount++ == 0) {
  #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC
          int i;
          int *thismod = NULL;
          for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) {
              if (kmsdrmlibs[i].libname != NULL) {
                  kmsdrmlibs[i].lib = SDL_LoadObject(kmsdrmlibs[i].libname);
              }
          }
  
  #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; /* default yes */
  #include "SDL_kmsdrmsym.h"
  
  #define SDL_KMSDRM_MODULE(modname) thismod = &SDL_KMSDRM_HAVE_##modname;
  #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = (SDL_DYNKMSDRMFN_##fn) KMSDRM_GetSym(#fn,thismod);
  #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = *(SDL_DYNKMSDRMCONST_##name*) KMSDRM_GetSym(#name,thismod);
  #include "SDL_kmsdrmsym.h"
  
          if ((SDL_KMSDRM_HAVE_LIBDRM) && (SDL_KMSDRM_HAVE_GBM)) {
              /* all required symbols loaded. */
              SDL_ClearError();
          } else {
              /* in case something got loaded... */
              SDL_KMSDRM_UnloadSymbols();
              rc = 0;
          }
  
  #else  /* no dynamic KMSDRM */
  
  #define SDL_KMSDRM_MODULE(modname) SDL_KMSDRM_HAVE_##modname = 1; /* default yes */
  #define SDL_KMSDRM_SYM(rc,fn,params) KMSDRM_##fn = fn;
  #define SDL_KMSDRM_SYM_CONST(type,name) KMSDRM_##name = name;
  #include "SDL_kmsdrmsym.h"
  
  #endif
      }
  
      return rc;
  }
  
  #endif /* SDL_VIDEO_DRIVER_KMSDRM */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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