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678f99677f
Currently, all timelines install a timeout inside the TimeoutPool
they share. Every time the main loop spins, all the timeouts are
updated. This, in turn, will usually lead to redraws being queued
on the stages.
This behaviour leads to the potential starvation of timelines and
to excessive redraws.
One lesson learned from the games developers is that the scenegraph
should be prepared in its entirety before the GL paint sequence is
initiated. This means making sure that every ::new-frame signal
handler is called before clutter_redraw() is invoked.
In order to do so a TimeoutPool is not enough: we need a master
clock. The clock will be responsible for advancing all the active
timelines created inside a scene, but only when the stage is
being redrawn.
The sequence is:
+ queue_redraw() is invoked on an actor and bubbles up
to the stage
+ if no redraw() has already been scheduled, install an
idle handler with a known priority
+ inside the idle handler:
- advance the master clock, which will in turn advance
every playing timeline by the amount of milliseconds
elapsed since the last redraw; this will make every
playing timeline emit the ::new-frame signal
- queue a relayout
- call the redraw() method of the backend
This way we trade multiple timeouts with a single frame source
that only runs if a timeline is playing and queues redraws on
the various stages.
365 lines
10 KiB
C
365 lines
10 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By: Emmanuele Bassi <ebassi@linux.intel.com>
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*
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* Copyright (C) 2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* SECTION:clutter-master-clock
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* @short_description: The master clock for all animations
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*
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* The #ClutterMasterClock class is responsible for advancing all
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* #ClutterTimelines when a stage is being redrawn. The master clock
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* makes sure that the scenegraph is always integrally updated before
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* painting it.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "clutter-master-clock.h"
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#include "clutter-debug.h"
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#include "clutter-private.h"
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#define CLUTTER_MASTER_CLOCK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_MASTER_CLOCK, ClutterMasterClockClass))
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#define CLUTTER_IS_MASTER_CLOCK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_MASTER_CLOCK))
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#define CLUTTER_MASTER_CLASS_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_MASTER_CLOCK, ClutterMasterClockClass))
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typedef struct _ClutterMasterClockClass ClutterMasterClockClass;
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struct _ClutterMasterClock
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{
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GObject parent_instance;
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GSList *timelines;
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GTimeVal prev_tick;
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gulong msecs_delta;
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gulong tick_id;
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};
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struct _ClutterMasterClockClass
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{
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GObjectClass parent_class;
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};
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static ClutterMasterClock *default_clock = NULL;
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static void on_timeline_start (ClutterTimeline *timeline,
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ClutterMasterClock *master_clock);
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static void on_timeline_completed (ClutterTimeline *timeline,
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ClutterMasterClock *master_clock);
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static void on_timeline_paused (ClutterTimeline *timeline,
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ClutterMasterClock *master_clock);
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G_DEFINE_TYPE (ClutterMasterClock, clutter_master_clock, G_TYPE_OBJECT);
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static void
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timeline_weak_ref (gpointer data,
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GObject *object_pointer)
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{
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ClutterMasterClock *master_clock = data;
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master_clock->timelines = g_slist_remove (master_clock->timelines,
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object_pointer);
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if (master_clock->timelines == NULL)
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{
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if (master_clock->tick_id != 0)
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{
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g_source_remove (master_clock->tick_id);
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master_clock->tick_id = 0;
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}
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master_clock->prev_tick.tv_sec = 0;
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}
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}
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static void
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clutter_master_clock_finalize (GObject *gobject)
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{
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ClutterMasterClock *master_clock = CLUTTER_MASTER_CLOCK (gobject);
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GSList *l;
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if (master_clock->tick_id != 0)
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{
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g_source_remove (master_clock->tick_id);
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master_clock->tick_id = 0;
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}
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for (l = master_clock->timelines; l != NULL; l = l->next)
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{
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ClutterTimeline *timeline = l->data;
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g_object_weak_unref (G_OBJECT (timeline),
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timeline_weak_ref,
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master_clock);
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g_signal_handlers_disconnect_by_func (timeline,
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G_CALLBACK (on_timeline_start),
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master_clock);
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g_signal_handlers_disconnect_by_func (timeline,
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G_CALLBACK (on_timeline_completed),
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master_clock);
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g_signal_handlers_disconnect_by_func (timeline,
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G_CALLBACK (on_timeline_paused),
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master_clock);
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}
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g_slist_free (master_clock->timelines);
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G_OBJECT_CLASS (clutter_master_clock_parent_class)->finalize (gobject);
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}
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static void
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clutter_master_clock_class_init (ClutterMasterClockClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->finalize = clutter_master_clock_finalize;
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}
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static void
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clutter_master_clock_init (ClutterMasterClock *self)
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{
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}
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/*
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* _clutter_master_clock_get_default:
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*
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* Retrieves the default master clock. If this function has never
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* been called before, the default master clock is created.
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*
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* Return value: the default master clock. The returned object is
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* owned by Clutter and should not be modified or freed
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*/
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ClutterMasterClock *
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_clutter_master_clock_get_default (void)
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{
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if (G_LIKELY (default_clock != NULL))
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return default_clock;
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default_clock = g_object_new (CLUTTER_TYPE_MASTER_CLOCK, NULL);
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return default_clock;
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}
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static gboolean
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master_clock_tick (gpointer data)
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{
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ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
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GSList *stages, *l;
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CLUTTER_NOTE (SCHEDULER, "Master clock [tick]");
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stages = clutter_stage_manager_list_stages (stage_manager);
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for (l = stages; l != NULL; l = l->next)
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clutter_actor_queue_redraw (l->data);
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g_slist_free (stages);
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return TRUE;
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}
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static gboolean
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has_running_timeline (ClutterMasterClock *master_clock)
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{
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GSList *l;
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for (l = master_clock->timelines; l != NULL; l = l->next)
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{
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if (clutter_timeline_is_playing (l->data))
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return TRUE;
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}
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return FALSE;
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}
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static void
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on_timeline_start (ClutterTimeline *timeline,
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ClutterMasterClock *master_clock)
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{
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if (has_running_timeline (master_clock) &&
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master_clock->tick_id == 0)
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{
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master_clock->prev_tick.tv_sec = 0;
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master_clock->tick_id =
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clutter_threads_add_frame_source (clutter_get_default_frame_rate (),
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master_clock_tick,
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master_clock);
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}
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}
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static void
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on_timeline_completed (ClutterTimeline *timeline,
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ClutterMasterClock *master_clock)
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{
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if (!has_running_timeline (master_clock) &&
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master_clock->tick_id != 0)
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{
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master_clock->prev_tick.tv_sec = 0;
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g_source_remove (master_clock->tick_id);
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master_clock->tick_id = 0;
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}
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}
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static void
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on_timeline_paused (ClutterTimeline *timeline,
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ClutterMasterClock *master_clock)
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{
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if (!has_running_timeline (master_clock) &&
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master_clock->tick_id != 0)
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{
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master_clock->prev_tick.tv_sec = 0;
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g_source_remove (master_clock->tick_id);
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master_clock->tick_id = 0;
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}
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}
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/*
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* _clutter_master_clock_add_timeline:
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* @master_clock: a #ClutterMasterClock
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* @timeline: a #ClutterTimeline
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*
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* Adds @timeline to the list of timelines held by the master
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* clock. This function should be called during the instance
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* creation phase of the timeline.
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*/
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void
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_clutter_master_clock_add_timeline (ClutterMasterClock *master_clock,
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ClutterTimeline *timeline)
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{
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gboolean is_first = FALSE;
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if (g_slist_find (master_clock->timelines, timeline))
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return;
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is_first = (master_clock->timelines == NULL) ? TRUE : FALSE;
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master_clock->timelines = g_slist_prepend (master_clock->timelines,
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timeline);
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g_object_weak_ref (G_OBJECT (timeline),
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timeline_weak_ref,
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master_clock);
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g_signal_connect (timeline, "started",
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G_CALLBACK (on_timeline_start),
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master_clock);
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g_signal_connect (timeline, "completed",
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G_CALLBACK (on_timeline_completed),
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master_clock);
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g_signal_connect (timeline, "paused",
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G_CALLBACK (on_timeline_paused),
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master_clock);
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}
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/*
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* _clutter_master_clock_remove_timeline:
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* @master_clock: a #ClutterMasterClock
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* @timeline: a #ClutterTimeline
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*
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* Removes @timeline from the list of timelines held by the
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* master clock. This function should be called during the
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* #ClutterTimeline finalization.
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*/
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void
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_clutter_master_clock_remove_timeline (ClutterMasterClock *master_clock,
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ClutterTimeline *timeline)
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{
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if (!g_slist_find (master_clock->timelines, timeline))
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return;
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master_clock->timelines = g_slist_remove (master_clock->timelines,
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timeline);
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g_object_weak_unref (G_OBJECT (timeline),
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timeline_weak_ref,
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master_clock);
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g_signal_handlers_disconnect_by_func (timeline,
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G_CALLBACK (on_timeline_start),
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master_clock);
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g_signal_handlers_disconnect_by_func (timeline,
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G_CALLBACK (on_timeline_completed),
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master_clock);
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g_signal_handlers_disconnect_by_func (timeline,
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G_CALLBACK (on_timeline_paused),
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master_clock);
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if (master_clock->timelines == NULL)
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{
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if (master_clock->tick_id != 0)
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{
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g_source_remove (master_clock->tick_id);
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master_clock->tick_id = 0;
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}
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master_clock->prev_tick.tv_sec = 0;
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}
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}
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/*
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* _clutter_master_clock_advance:
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* @master_clock: a #ClutterMasterClock
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*
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* Advances all the timelines held by the master clock. This function
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* should be called before calling clutter_redraw() to make sure that
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* all the timelines are advanced and the scene is updated.
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*/
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void
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_clutter_master_clock_advance (ClutterMasterClock *master_clock)
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{
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GTimeVal cur_tick = { 0, };
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gulong msecs;
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GSList *l;
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g_return_if_fail (CLUTTER_IS_MASTER_CLOCK (master_clock));
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g_get_current_time (&cur_tick);
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if (master_clock->prev_tick.tv_sec == 0)
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master_clock->prev_tick = cur_tick;
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msecs = (cur_tick.tv_sec - master_clock->prev_tick.tv_sec) * 1000
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+ (cur_tick.tv_usec - master_clock->prev_tick.tv_usec) / 1000;
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CLUTTER_NOTE (SCHEDULER, "Advancing %d timelines by %lu milliseconds",
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g_slist_length (master_clock->timelines),
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msecs);
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for (l = master_clock->timelines; l != NULL; l = l->next)
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{
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ClutterTimeline *timeline = l->data;
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if (clutter_timeline_is_playing (timeline))
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_clutter_timeline_set_delta (timeline, msecs);
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}
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master_clock->msecs_delta = msecs;
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master_clock->prev_tick = cur_tick;
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}
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