/* * Clutter. * * An OpenGL based 'interactive canvas' library. * * Authored By Matthew Allum * * Copyright (C) 2006 OpenedHand * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:clutter-main * @short_description: Various 'global' clutter functions. * * Functions to retrieve various global Clutter resources and other utility * functions for mainloops, events and threads */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "clutter-event.h" #include "clutter-backend.h" #include "clutter-main.h" #include "clutter-feature.h" #include "clutter-actor.h" #include "clutter-stage.h" #include "clutter-private.h" #include "clutter-debug.h" #include "clutter-version.h" /* For flavour define */ #include "cogl.h" /* main context */ static ClutterMainContext *ClutterCntx = NULL; /* main lock and locking/unlocking functions */ static GMutex *clutter_threads_mutex = NULL; static GCallback clutter_threads_lock = NULL; static GCallback clutter_threads_unlock = NULL; static gboolean clutter_is_initialized = FALSE; static gboolean clutter_show_fps = FALSE; static gboolean clutter_fatal_warnings = FALSE; static guint clutter_main_loop_level = 0; static GSList *main_loops = NULL; guint clutter_debug_flags = 0; /* global clutter debug flag */ #ifdef CLUTTER_ENABLE_DEBUG static const GDebugKey clutter_debug_keys[] = { { "misc", CLUTTER_DEBUG_MISC }, { "actor", CLUTTER_DEBUG_ACTOR }, { "texture", CLUTTER_DEBUG_TEXTURE }, { "event", CLUTTER_DEBUG_EVENT }, { "paint", CLUTTER_DEBUG_PAINT }, { "gl", CLUTTER_DEBUG_GL }, { "alpha", CLUTTER_DEBUG_ALPHA }, { "behaviour", CLUTTER_DEBUG_BEHAVIOUR }, { "pango", CLUTTER_DEBUG_PANGO }, { "backend", CLUTTER_DEBUG_BACKEND }, { "scheduler", CLUTTER_DEBUG_SCHEDULER }, }; #endif /* CLUTTER_ENABLE_DEBUG */ /** * clutter_get_show_fps: * * Returns whether Clutter should print out the frames per second on the * console. You can enable this setting either using the * CLUTTER_SHOW_FPS environment variable or passing * the --clutter-show-fps command line argument. * * * Return value: %TRUE if Clutter should show the FPS. * * Since: 0.4 */ gboolean clutter_get_show_fps (void) { return clutter_show_fps; } /** * clutter_redraw: * * Forces a redraw of the entire stage. Applications should never use this * function, but queue a redraw using clutter_actor_queue_redraw(). */ void clutter_redraw (void) { ClutterMainContext *ctx; ClutterActor *stage; static GTimer *timer = NULL; static guint timer_n_frames = 0; ctx = clutter_context_get_default (); stage = _clutter_backend_get_stage (ctx->backend); CLUTTER_TIMESTAMP (SCHEDULER, "Redraw start"); CLUTTER_NOTE (PAINT, " Redraw enter"); /* Setup FPS count */ if (clutter_get_show_fps ()) { if (!timer) timer = g_timer_new (); } /* The below cant go in stage paint as base actor_paint will get * called before the below (and break picking etc) */ if (CLUTTER_PRIVATE_FLAGS (stage) & CLUTTER_ACTOR_SYNC_MATRICES) { ClutterPerspective perspective; clutter_stage_get_perspectivex (CLUTTER_STAGE (stage), &perspective); cogl_setup_viewport (clutter_actor_get_width (stage), clutter_actor_get_height (stage), perspective.fovy, perspective.aspect, perspective.z_near, perspective.z_far); CLUTTER_UNSET_PRIVATE_FLAGS (stage, CLUTTER_ACTOR_SYNC_MATRICES); } /* Call through ti the actual backend to do the painting down from * the stage. It will likely need to swap buffers, vblank sync etc * which will be windowing system dependant. */ _clutter_backend_redraw (ctx->backend); /* Complete FPS info */ if (clutter_get_show_fps ()) { timer_n_frames++; if (g_timer_elapsed (timer, NULL) >= 1.0) { g_print ("*** FPS: %i ***\n", timer_n_frames); timer_n_frames = 0; g_timer_start (timer); } } CLUTTER_NOTE (PAINT, " Redraw leave"); CLUTTER_TIMESTAMP (SCHEDULER, "Redraw finish"); } /** * clutter_do_event * @event: a #ClutterEvent. * * Processes an event. This function should never be called by applications. * * Since: 0.4 */ void clutter_do_event (ClutterEvent *event) { ClutterMainContext *context; ClutterBackend *backend; ClutterActor *stage; context = clutter_context_get_default (); backend = context->backend; stage = _clutter_backend_get_stage (backend); if (!stage) return; CLUTTER_TIMESTAMP (SCHEDULER, "Event recieved"); switch (event->type) { case CLUTTER_NOTHING: break; case CLUTTER_DESTROY_NOTIFY: case CLUTTER_DELETE: if (clutter_stage_event (CLUTTER_STAGE (stage), event)) clutter_main_quit (); break; case CLUTTER_KEY_PRESS: case CLUTTER_KEY_RELEASE: case CLUTTER_MOTION: case CLUTTER_BUTTON_PRESS: case CLUTTER_2BUTTON_PRESS: case CLUTTER_3BUTTON_PRESS: case CLUTTER_BUTTON_RELEASE: case CLUTTER_SCROLL: clutter_stage_event (CLUTTER_STAGE (stage), event); break; case CLUTTER_STAGE_STATE: case CLUTTER_CLIENT_MESSAGE: break; } } /** * clutter_main_quit: * * Terminates the Clutter mainloop. */ void clutter_main_quit (void) { g_return_if_fail (main_loops != NULL); g_main_loop_quit (main_loops->data); } /** * clutter_main_level: * * Retrieves the depth of the Clutter mainloop. * * Return value: The level of the mainloop. */ gint clutter_main_level (void) { return clutter_main_loop_level; } /** * clutter_main: * * Starts the Clutter mainloop. */ void clutter_main (void) { ClutterMainContext *context = CLUTTER_CONTEXT (); GMainLoop *loop; if (!clutter_is_initialized) { g_warning ("Called clutter_main() but Clutter wasn't initialised. " "You must call clutter_init() first."); return; } CLUTTER_MARK (); clutter_main_loop_level++; loop = g_main_loop_new (NULL, TRUE); main_loops = g_slist_prepend (main_loops, loop); if (g_main_loop_is_running (main_loops->data)) { clutter_threads_leave (); g_main_loop_run (loop); clutter_threads_enter (); } main_loops = g_slist_remove (main_loops, loop); g_main_loop_unref (loop); clutter_main_loop_level--; if (clutter_main_loop_level == 0) { /* this will take care of destroying the stage */ g_object_unref (context->backend); context->backend = NULL; g_free (context); } CLUTTER_MARK (); } static void clutter_threads_impl_lock (void) { if (clutter_threads_mutex) g_mutex_lock (clutter_threads_mutex); } static void clutter_threads_impl_unlock (void) { if (clutter_threads_mutex) g_mutex_unlock (clutter_threads_mutex); } /** * clutter_threads_init: * * Initialises the Clutter threading mechanism, so that Clutter API can be * called by multiple threads, using clutter_threads_enter() and * clutter_threads_leave() to mark the critical sections. * * You must call g_thread_init() before this function. * * This function must be called before clutter_init(). * * Since: 0.6 */ void clutter_threads_init (void) { if (!g_thread_supported ()) g_error ("g_thread_init() must be called before clutter_threads_init()"); clutter_threads_mutex = g_mutex_new (); if (!clutter_threads_lock) clutter_threads_lock = clutter_threads_impl_lock; if (!clutter_threads_unlock) clutter_threads_unlock = clutter_threads_impl_unlock; } /** * clutter_threads_set_lock_functions: * @enter_fn: function called when aquiring the Clutter main lock * @leave_fn: function called when releasing the Clutter main lock * * Allows the application to replace the standard method that * Clutter uses to protect its data structures. Normally, Clutter * creates a single #GMutex that is locked by clutter_threads_enter(), * and released by clutter_threads_leave(); using this function an * application provides, instead, a function @enter_fn that is * called by clutter_threads_enter() and a function @leave_fn that is * called by clutter_threads_leave(). * * The functions must provide at least same locking functionality * as the default implementation, but can also do extra application * specific processing. * * As an example, consider an application that has its own recursive * lock that when held, holds the Clutter lock as well. When Clutter * unlocks the Clutter lock when entering a recursive main loop, the * application must temporarily release its lock as well. * * Most threaded Clutter apps won't need to use this method. * * This method must be called before clutter_threads_init(), and cannot * be called multiple times. * * Since: 0.6 */ void clutter_threads_set_lock_functions (GCallback enter_fn, GCallback leave_fn) { g_return_if_fail (clutter_threads_lock == NULL && clutter_threads_unlock == NULL); clutter_threads_lock = enter_fn; clutter_threads_unlock = leave_fn; } typedef struct { GSourceFunc func; gpointer data; GDestroyNotify notify; } ClutterThreadsDispatch; static gboolean clutter_threads_dispatch (gpointer data) { ClutterThreadsDispatch *dispatch = data; gboolean ret = FALSE; clutter_threads_enter (); if (!g_source_is_destroyed (g_main_current_source ())) ret = dispatch->func (dispatch->data); clutter_threads_leave (); return ret; } static void clutter_threads_dispatch_free (gpointer data) { ClutterThreadsDispatch *dispatch = data; clutter_threads_enter (); if (dispatch->notify) dispatch->notify (dispatch->data); clutter_threads_leave (); g_slice_free (ClutterThreadsDispatch, dispatch); } /** * clutter_threads_add_idle_full: * @priority: the priority of the timeout source. Typically this will be in the * range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE * @func: function to call * @data: data to pass to the function * @notify: functio to call when the idle source is removed * * Adds a function to be called whenever there are no higher priority * events pending. If the function returns %FALSE it is automatically * removed from the list of event sources and will not be called again. * * This variant of g_idle_add_full() calls @function with the Clutter lock * held. It can be thought of a MT-safe version for Clutter actors for the * following use case, where you have to worry about idle_callback() * running in thread A and accessing @self after it has been finalized * in thread B: * * * static gboolean * idle_callback (gpointer data) * { * // clutter_threads_enter(); would be needed for g_idle_add() * * SomeActor *self = data; * /* do stuff with self */ * * self->idle_id = 0; * * // clutter_threads_leave(); would be needed for g_idle_add() * return FALSE; * } * static void * some_actor_do_stuff_later (SomeActor *self) * { * self->idle_id = clutter_threads_add_idle (idle_callback, self) * // using g_idle_add() here would require thread protection in the callback * } * * static void * some_actor_finalize (GObject *object) * { * SomeActor *self = SOME_ACTOR (object); * if (self->idle_id) * g_source_remove (self->idle_id); * G_OBJECT_CLASS (parent_class)->finalize (object); * } * * * Return value: the ID (greater than 0) of the event source. * * Since: 0.6 */ guint clutter_threads_add_idle_full (gint priority, GSourceFunc func, gpointer data, GDestroyNotify notify) { ClutterThreadsDispatch *dispatch; g_return_val_if_fail (func != NULL, 0); dispatch = g_slice_new (ClutterThreadsDispatch); dispatch->func = func; dispatch->data = data; dispatch->notify = notify; return g_idle_add_full (priority, clutter_threads_dispatch, dispatch, clutter_threads_dispatch_free); } /** * clutter_threads_add_idle: * @func: function to call * @data: data to pass to the function * * Simple wrapper around clutter_threads_add_idle_full() * * Return value: the ID (greater than 0) of the event source. * * Since: 0.6 */ guint clutter_threads_add_idle (GSourceFunc func, gpointer data) { g_return_val_if_fail (func != NULL, 0); return clutter_threads_add_idle_full (G_PRIORITY_DEFAULT_IDLE, func, data, NULL); } /** * clutter_threads_add_timeout_full: * @priority: the priority of the timeout source. Typically this will be in the * range between #G_PRIORITY_DEFAULT and #G_PRIORITY_HIGH. * @interval: the time between calls to the function, in milliseconds * @func: function to call * @data: data to pass to the function * @notify: function to call when the timeout source is removed * * Sets a function to be called at regular intervals holding the Clutter lock, * with the given priority. The function is called repeatedly until it * returns %FALSE, at which point the timeout is automatically destroyed * and the function will not be called again. The @notify function is * called when the timeout is destroyed. The first call to the * function will be at the end of the first @interval. * * Note that timeout functions may be delayed, due to the processing of other * event sources. Thus they should not be relied on for precise timing. * After each call to the timeout function, the time of the next * timeout is recalculated based on the current time and the given interval * (it does not try to 'catch up' time lost in delays). * * This variant of g_timeout_add_full() can be thought of a MT-safe version * for Clutter actors. See also clutter_threads_add_idle_full(). * * Return value: the ID (greater than 0) of the event source. * * Since: 0.6 */ guint clutter_threads_add_timeout_full (gint priority, guint interval, GSourceFunc func, gpointer data, GDestroyNotify notify) { ClutterThreadsDispatch *dispatch; g_return_val_if_fail (func != NULL, 0); dispatch = g_slice_new (ClutterThreadsDispatch); dispatch->func = func; dispatch->data = data; dispatch->notify = notify; return g_timeout_add_full (priority, interval, clutter_threads_dispatch, dispatch, clutter_threads_dispatch_free); } /** * clutter_threads_add_timeout: * @interval: the time between calls to the function, in milliseconds * @func: function to call * @data: data to pass to the function * * Simple wrapper around clutter_threads_add_timeout_full(). * * Return value: the ID (greater than 0) of the event source. * * Since: 0.6 */ guint clutter_threads_add_timeout (guint interval, GSourceFunc func, gpointer data) { g_return_val_if_fail (func != NULL, 0); return clutter_threads_add_timeout_full (G_PRIORITY_DEFAULT, interval, func, data, NULL); } /** * clutter_threads_enter: * * Locks the Clutter thread lock. * * Since: 0.6 */ void clutter_threads_enter (void) { if (clutter_threads_lock) (* clutter_threads_lock) (); } /** * clutter_threads_leave: * * Unlocks the Clutter thread lock. * * Since: 0.6 */ void clutter_threads_leave (void) { if (clutter_threads_unlock) (* clutter_threads_unlock) (); } /** * clutter_get_debug_enabled: * * Check if clutter has debugging turned on. * * Return value: TRUE if debugging is turned on, FALSE otherwise. */ gboolean clutter_get_debug_enabled (void) { #ifdef CLUTTER_ENABLE_DEBUG return clutter_debug_flags != 0; #else return FALSE; #endif } ClutterMainContext* clutter_context_get_default (void) { if (G_UNLIKELY(!ClutterCntx)) { ClutterMainContext *ctx; ctx = g_new0 (ClutterMainContext, 1); ctx->backend = g_object_new (_clutter_backend_impl_get_type (), NULL); ctx->is_initialized = FALSE; #ifdef CLUTTER_ENABLE_DEBUG ctx->timer = g_timer_new (); g_timer_start (ctx->timer); #endif ClutterCntx = ctx; } return ClutterCntx; } /** * clutter_get_timestamp: * * Returns the approximate number of microseconds passed since clutter was * intialised. * * Return value: Number of microseconds since clutter_init() was called. */ gulong clutter_get_timestamp (void) { #ifdef CLUTTER_ENABLE_DEBUG ClutterMainContext *ctx; gdouble seconds; ctx = clutter_context_get_default (); /* FIXME: may need a custom timer for embedded setups */ seconds = g_timer_elapsed (ctx->timer, NULL); return (gulong)(seconds / 1.0e-6); #else return 0; #endif } #ifdef CLUTTER_ENABLE_DEBUG static gboolean clutter_arg_debug_cb (const char *key, const char *value, gpointer user_data) { clutter_debug_flags |= g_parse_debug_string (value, clutter_debug_keys, G_N_ELEMENTS (clutter_debug_keys)); return TRUE; } static gboolean clutter_arg_no_debug_cb (const char *key, const char *value, gpointer user_data) { clutter_debug_flags &= ~g_parse_debug_string (value, clutter_debug_keys, G_N_ELEMENTS (clutter_debug_keys)); return TRUE; } #endif /* CLUTTER_ENABLE_DEBUG */ static GOptionEntry clutter_args[] = { { "clutter-show-fps", 0, 0, G_OPTION_ARG_NONE, &clutter_show_fps, "Show frames per second", NULL }, { "g-fatal-warnings", 0, 0, G_OPTION_ARG_NONE, &clutter_fatal_warnings, "Make all warnings fatal", NULL }, #ifdef CLUTTER_ENABLE_DEBUG { "clutter-debug", 0, 0, G_OPTION_ARG_CALLBACK, clutter_arg_debug_cb, "Clutter debugging flags to set", "FLAGS" }, { "clutter-no-debug", 0, 0, G_OPTION_ARG_CALLBACK, clutter_arg_no_debug_cb, "Clutter debugging flags to unset", "FLAGS" }, #endif /* CLUTTER_ENABLE_DEBUG */ { NULL, }, }; /* pre_parse_hook: initialise variables depending on environment * variables; these variables might be overridden by the command * line arguments that are going to be parsed after. */ static gboolean pre_parse_hook (GOptionContext *context, GOptionGroup *group, gpointer data, GError **error) { ClutterMainContext *clutter_context; ClutterBackend *backend; const char *env_string; if (clutter_is_initialized) return TRUE; clutter_context = clutter_context_get_default (); clutter_context->font_map = PANGO_FT2_FONT_MAP (pango_ft2_font_map_new ()); pango_ft2_font_map_set_resolution (clutter_context->font_map, 96.0, 96.0); backend = clutter_context->backend; g_assert (CLUTTER_IS_BACKEND (backend)); #ifdef CLUTTER_ENABLE_DEBUG env_string = g_getenv ("CLUTTER_DEBUG"); if (env_string != NULL) { clutter_debug_flags = g_parse_debug_string (env_string, clutter_debug_keys, G_N_ELEMENTS (clutter_debug_keys)); env_string = NULL; } #endif /* CLUTTER_ENABLE_DEBUG */ env_string = g_getenv ("CLUTTER_SHOW_FPS"); if (env_string) clutter_show_fps = TRUE; if (CLUTTER_BACKEND_GET_CLASS (backend)->pre_parse) return CLUTTER_BACKEND_GET_CLASS (backend)->pre_parse (backend, error); return TRUE; } /* post_parse_hook: initialise the context and data structures * and opens the X display */ static gboolean post_parse_hook (GOptionContext *context, GOptionGroup *group, gpointer data, GError **error) { ClutterMainContext *clutter_context; ClutterBackend *backend; gboolean retval = FALSE; if (clutter_is_initialized) return TRUE; clutter_context = clutter_context_get_default (); backend = clutter_context->backend; g_assert (CLUTTER_IS_BACKEND (backend)); if (clutter_fatal_warnings) { GLogLevelFlags fatal_mask; fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK); fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL; g_log_set_always_fatal (fatal_mask); } if (CLUTTER_BACKEND_GET_CLASS (backend)->post_parse) retval = CLUTTER_BACKEND_GET_CLASS (backend)->post_parse (backend, error); else retval = TRUE; clutter_is_initialized = retval; return retval; } /** * clutter_get_option_group: * * Returns a #GOptionGroup for the command line arguments recognized * by Clutter. You should add this group to your #GOptionContext with * g_option_context_add_group(), if you are using g_option_context_parse() * to parse your commandline arguments. * * Return value: a GOptionGroup for the commandline arguments * recognized by Clutter * * Since: 0.2 */ GOptionGroup * clutter_get_option_group (void) { ClutterMainContext *context; GOptionGroup *group; context = clutter_context_get_default (); group = g_option_group_new ("clutter", "Clutter Options", "Show Clutter Options", NULL, NULL); g_option_group_set_parse_hooks (group, pre_parse_hook, post_parse_hook); g_option_group_add_entries (group, clutter_args); /* add backend-specific options */ _clutter_backend_add_options (context->backend, group); return group; } GQuark clutter_init_error_quark (void) { return g_quark_from_static_string ("clutter-init-error-quark"); } /** * clutter_init_with_args: * @argc: a pointer to the number of command line arguments * @argv: a pointer to the array of comman line arguments * @parameter_string: a string which is displayed in the * first line of output, after * programname [OPTION...] * @entries: a %NULL terminated array of #GOptionEntrys * describing the options of your program * @translation_domain: a translation domain to use for translating * the output for the options in @entries * with gettext(), or %NULL * @error: a return location for a #GError * * This function does the same work as clutter_init(). Additionally, * it allows you to add your own command line options, and it * automatically generates nicely formatted * output. Note that your program will be terminated after writing * out the help output. Also note that, in case of error, the * error message will be placed inside @error instead of being * printed on the display. * * Return value: %CLUTTER_INIT_SUCCESS if Clutter has been successfully * initialised, or other values or #ClutterInitError in case of * error. * * Since: 0.2 */ ClutterInitError clutter_init_with_args (int *argc, char ***argv, char *parameter_string, GOptionEntry *entries, char *translation_domain, GError **error) { ClutterMainContext *clutter_context; GOptionContext *context; GOptionGroup *group; gboolean res; GError *stage_error; if (clutter_is_initialized) return CLUTTER_INIT_SUCCESS; clutter_base_init (); if (argc && *argc > 0 && *argv) g_set_prgname ((*argv)[0]); group = clutter_get_option_group (); context = g_option_context_new (parameter_string); g_option_context_add_group (context, group); if (entries) g_option_context_add_main_entries (context, entries, translation_domain); res = g_option_context_parse (context, argc, argv, error); g_option_context_free (context); /* if res is FALSE, the error is filled for * us by g_option_context_parse() */ if (!res) return CLUTTER_INIT_ERROR_INTERNAL; clutter_context = clutter_context_get_default (); stage_error = NULL; if (!_clutter_backend_init_stage (clutter_context->backend, &stage_error)) { g_propagate_error (error, stage_error); return CLUTTER_INIT_ERROR_INTERNAL; } _clutter_backend_init_events (clutter_context->backend); _clutter_feature_init (); clutter_stage_set_title (CLUTTER_STAGE(clutter_stage_get_default()), g_get_prgname ()); return CLUTTER_INIT_SUCCESS; } static gboolean clutter_parse_args (int *argc, char ***argv) { GOptionContext *option_context; GOptionGroup *clutter_group; GError *error = NULL; gboolean ret = TRUE; if (clutter_is_initialized) return TRUE; option_context = g_option_context_new (NULL); g_option_context_set_ignore_unknown_options (option_context, TRUE); g_option_context_set_help_enabled (option_context, FALSE); /* Initiate any command line options from the backend */ clutter_group = clutter_get_option_group (); g_option_context_set_main_group (option_context, clutter_group); if (!g_option_context_parse (option_context, argc, argv, &error)) { g_warning ("%s", error->message); g_error_free (error); ret = FALSE; } g_option_context_free (option_context); return ret; } /** * clutter_init: * @argc: The number of arguments in @argv * @argv: A pointer to an array of arguments. * * It will initialise everything needed to operate with Clutter and * parses some standard command line options. @argc and @argv are * adjusted accordingly so your own code will never see those standard * arguments. * * Return value: 1 on success, < 0 on failure. */ ClutterInitError clutter_init (int *argc, char ***argv) { ClutterMainContext *context; GError *stage_error; if (clutter_is_initialized) return CLUTTER_INIT_SUCCESS; clutter_base_init (); if (argc && *argc > 0 && *argv) g_set_prgname ((*argv)[0]); /* parse_args will trigger backend creation and things like * DISPLAY connection etc. */ if (clutter_parse_args (argc, argv) == FALSE) { CLUTTER_NOTE (MISC, "failed to parse arguments."); return CLUTTER_INIT_ERROR_INTERNAL; } /* Note, creates backend if not already existing (though parse args will * have likely created it) */ context = clutter_context_get_default (); /* Stage will give us a GL Context etc */ stage_error = NULL; if (!_clutter_backend_init_stage (context->backend, &stage_error)) { CLUTTER_NOTE (MISC, "stage failed to initialise."); g_critical (stage_error->message); g_error_free (stage_error); return CLUTTER_INIT_ERROR_INTERNAL; } /* Initiate event collection */ _clutter_backend_init_events (context->backend); /* finally features - will call to backend and cogl */ _clutter_feature_init (); clutter_stage_set_title (CLUTTER_STAGE(clutter_stage_get_default()), g_get_prgname()); return CLUTTER_INIT_SUCCESS; } gboolean _clutter_boolean_accumulator (GSignalInvocationHint *ihint, GValue *return_accu, const GValue *handler_return, gpointer dummy) { gboolean continue_emission; gboolean signal_handled; signal_handled = g_value_get_boolean (handler_return); g_value_set_boolean (return_accu, signal_handled); continue_emission = !signal_handled; return continue_emission; } void clutter_base_init (void) { static gboolean initialised = FALSE; if (!initialised) { GType foo; /* Quiet gcc */ initialised = TRUE; /* initialise GLib type system */ g_type_init (); /* CLUTTER_TYPE_ACTOR */ foo = clutter_actor_get_type (); } }