Emmanuele Bassi
ebassi@linux.intel.com
Running Clutter
Environment Variables Clutter automatically checks environment variables during its initialization. These environment variables are meant as debug tools, overrides for default behaviours or to address known hardware issues: CLUTTER_TEXT_DIRECTION Forces the text direction of every Pango layout inside Clutter. Valid values are: ltr or rtl CLUTTER_SHOW_FPS Prints out the frames per second achieved by Clutter. CLUTTER_DEFAULT_FPS Sets the default framerate. CLUTTER_DISABLE_MIPMAPPED_TEXT Disables mipmapping when rendering text. CLUTTER_FUZZY_PICK Enables "fuzzy picking". CLUTTER_DEBUG Enables debugging modes for Clutter. COGL_DEBUG Enables debugging modes for Cogl. On the GLX backend there is also: CLUTTER_VBLANK Selects the sync-to-vblank mode to be used. Valid values are: none, dri or glx
Command Line Arguments Similarly to the environment variables, Clutter also installs command line switches that are parsed during initialization: --clutter-show-fps Equivalent of CLUTTER_SHOW_FPS. Prints the current rendering speed in frames per second. --clutter-default-fps=FPS Equivalent of CLUTTER_DEFAULT_FPS. Sets the default framerate. --clutter-text-direction=DIRECTION Equivalent of CLUTTER_TEXT_DIRECTION. Sets the direction for the text. --clutter-disable-mipmapped-text Equivalent of CLUTTER_DISABLE_MIPMAPPED_TEXT. Disables mipmapping when rendering text. --clutter-use-fuzzy-picking Equivalent of CLUTTER_FUZZY_PICK. Enables "fuzzy" picking. --clutter-debug=FLAGS Equivalent of CLUTTER_DEBUG. Sets FLAGS as the Clutter debugging flags. --clutter-no-debug=FLAGS Unsets FLAGS from the Clutter debugging flags. --cogl-debug=FLAGS Equivalent of COGL_DEBUG. Sets FLAGS as the Cogl debugging flags. --cogl-no-debug=FLAGS Unsets FLAGS from the Cogl debugging flags. --clutter-enable-accessibility Enables accessibility support. The X11 backends also have the following command line options: --display=DISPLAY Sets the X11 display to use. --screen=SCREEN Sets the X11 screen number to use. --synch Make X11 calls synchronous.
The GLX backend also has the following command line option: --vblank=METHOD Equivalent of CLUTTER_VBLANK. Sets the sync-to-vblank method to be used.
Debug flags for Clutter The debugging flags can be used for the CLUTTER_DEBUG environment variable and the --clutter-debug command line switch. Multiple flags can be separated by a colon (:). actor Generic actor-related notes animation #ClutterAnimation notes backend Backend-related notes, including initialization of the backend features and GL context creation behaviour #ClutterBehaviour notes event Event handling notes layout #ClutterLayoutManager notes misc Miscellaneous notes scheduler Notes related to timelines and the master clock script Notes related to #ClutterScript It is possible to get the whole debugging notes using the special "all" flag.