clutter backend test

#include <clutter/clutter.h>
#include <stdlib.h>

int
main (int argc, char *argv[])
{
  if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
    g_error ("*** Unable to initialize Clutter");

  const gchar *backend_str;

#if CLUTTER_WINDOWING_GDK
  if (clutter_check_backend (CLUTTER_GDK_BACKEND))
    backend_str = "Clutter is using the GDK backend";
  else
#endif
#if CLUTTER_WINDOWING_X11
  if (clutter_check_backend (CLUTTER_X11_BACKEND))
    backend_str = "Clutter is using the X11 backend";
  else
#endif
#if CLUTTER_WINDOWING_WAYLAND
  if (clutter_check_backend (CLUTTER_WAYLAND_BACKEND))
    backend_str = "Clutter is using the Wayland backend";
  else
#endif
#if CLUTTER_WINDOWING_OSX
  if (clutter_check_backend (CLUTTER_OSX_BACKEND))
    backend_str = "Clutter is using the OS X backend";
  else
#endif
#if CLUTTER_WINDOWING_WIN32
  if (clutter_check_backend (CLUTTER_WIN32_BACKEND))
    backend_str = "Clutter is using the Windows backend";
  else
#endif
    g_error ("*** Unrecognized backend");

  gchar *label = g_strconcat ("<big><b>", backend_str, "</b></big>", NULL);

  ClutterActor *stage = clutter_stage_new ();
  clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
  clutter_stage_set_title (CLUTTER_STAGE (stage), "Test Backends");
  clutter_stage_set_color (CLUTTER_STAGE (stage), CLUTTER_COLOR_LightSkyBlue);
  g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
  clutter_actor_show (stage);

  ClutterActor *text = clutter_text_new ();
  clutter_text_set_markup (CLUTTER_TEXT (text), label);
  clutter_actor_add_constraint (text, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
  clutter_actor_add_constraint (text, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
  clutter_container_add_actor (CLUTTER_CONTAINER (stage), text);

  ClutterVertex center = {
    .x = clutter_actor_get_width (text) / 2.0,
    .y = clutter_actor_get_height (text) / 2.0,
    .z = 0.f
  };

  ClutterAnimation *animation = clutter_actor_animate (text, CLUTTER_LINEAR, 6000,
                                                       "fixed::rotation-center-y", &center,
                                                       "rotation-angle-y", 360.0,
                                                       NULL);
  clutter_timeline_set_loop (clutter_animation_get_timeline (animation), TRUE);

  clutter_main ();

  g_free (label);

  return EXIT_SUCCESS;
}