typedef struct {
  SDL_version version;
  HWND window;                    /* The Win32 display window */
} SDL_SysWMinfo;

typedef enum {
  SDL_SYSWM_X11
} SDL_SYSWM_TYPE;

typedef struct {
  SDL_version version;
  SDL_SYSWM_TYPE subsystem;
  union {
    struct {
      Display *display;       /* The X11 display */
      Window window;          /* The X11 display window */
      /* These locking functions should be called around
         any X11 functions using the display variable.
         They lock the event thread, so should not be
         called around event functions or from event filters.
      */
      void (*lock_func)(void);
      void (*unlock_func)(void);

      /* Introduced in SDL 1.0.2 */
      Window fswindow;        /* The X11 fullscreen window */
      Window wmwindow;        /* The X11 managed input window */

      /* Introduced in SDL 1.2.12 */
      Display *gfxdisplay;      /* The X11 display to which rendering is done */
    } x11;
  } info;
} SDL_SysWMinfo;