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main: Make the MasterClock an interface

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Move the implementation of the MasterClock into MasterClockDefault, so
backends can provide their own implementation.

https://bugzilla.gnome.org/show_bug.cgi?id=744668
This commit is contained in:
Lionel Landwerlin 2015-02-17 14:50:13 +00:00
parent a9f2300af1
commit e94285693f
5 changed files with 807 additions and 643 deletions
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4
clutter/Makefile.am
View File

@ -180,6 +180,7 @@ source_c = \
clutter-list-model.c \
clutter-main.c \
clutter-master-clock.c \
clutter-master-clock-default.c \
clutter-model.c \
clutter-offscreen-effect.c \
clutter-page-turn-effect.c \
@ -233,6 +234,7 @@ source_h_priv = \
clutter-gesture-action-private.h \
clutter-id-pool.h \
clutter-master-clock.h \
clutter-master-clock-default.h \
clutter-model-private.h \
clutter-offscreen-effect-private.h \
clutter-paint-node-private.h \
@ -502,8 +504,8 @@ endif
gdk_source_c = \
gdk/clutter-backend-gdk.c \
gdk/clutter-device-manager-gdk.c \
gdk/clutter-input-device-gdk.c \
gdk/clutter-event-gdk.c \
gdk/clutter-input-device-gdk.c \
gdk/clutter-stage-gdk.c \
$(NULL)

716
clutter/clutter-master-clock-default.c Normal file
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@ -0,0 +1,716 @@
/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By: Emmanuele Bassi <ebassi@linux.intel.com>
*
* Copyright (C) 2009 Intel Corporation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* SECTION:clutter-master-clock-default
* @short_description: The default master clock for all animations
*
* The #ClutterMasterClockDefault class is the default implementation
* of #ClutterMasterClock.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-master-clock.h"
#include "clutter-master-clock-default.h"
#include "clutter-debug.h"
#include "clutter-private.h"
#include "clutter-profile.h"
#include "clutter-stage-manager-private.h"
#include "clutter-stage-private.h"
#ifdef CLUTTER_ENABLE_DEBUG
#define clutter_warn_if_over_budget(master_clock,start_time,section) G_STMT_START { \
gint64 __delta = g_get_monotonic_time () - start_time; \
gint64 __budget = master_clock->remaining_budget; \
if (__budget > 0 && __delta >= __budget) { \
_clutter_diagnostic_message ("%s took %" G_GINT64_FORMAT " microseconds " \
"more than the remaining budget of %" G_GINT64_FORMAT \
" microseconds", \
section, __delta - __budget, __budget); \
} } G_STMT_END
#else
#define clutter_warn_if_over_budget(master_clock,start_time,section)
#endif
typedef struct _ClutterClockSource ClutterClockSource;
struct _ClutterMasterClockDefault
{
GObject parent_instance;
/* the list of timelines handled by the clock */
GSList *timelines;
/* the current state of the clock, in usecs */
gint64 cur_tick;
/* the previous state of the clock, in usecs, used to compute the delta */
gint64 prev_tick;
#ifdef CLUTTER_ENABLE_DEBUG
gint64 frame_budget;
gint64 remaining_budget;
#endif
/* an idle source, used by the Master Clock to queue
* a redraw on the stage and drive the animations
*/
GSource *source;
/* If the master clock is idle that means it has
* fallen back to idle polling for timeline
* progressions and it may have been some time since
* the last real stage update.
*/
guint idle : 1;
guint ensure_next_iteration : 1;
guint paused : 1;
};
struct _ClutterClockSource
{
GSource source;
ClutterMasterClockDefault *master_clock;
};
static gboolean clutter_clock_prepare (GSource *source,
gint *timeout);
static gboolean clutter_clock_check (GSource *source);
static gboolean clutter_clock_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data);
static GSourceFuncs clock_funcs = {
clutter_clock_prepare,
clutter_clock_check,
clutter_clock_dispatch,
NULL
};
static void clutter_master_clock_iface_init (ClutterMasterClockIface *iface);
#define clutter_master_clock_default_get_type _clutter_master_clock_default_get_type
G_DEFINE_TYPE_WITH_CODE (ClutterMasterClockDefault,
clutter_master_clock_default,
G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_MASTER_CLOCK,
clutter_master_clock_iface_init));
/*
* master_clock_is_running:
* @master_clock: a #ClutterMasterClock
*
* Checks if we should currently be advancing timelines or redrawing
* stages.
*
* Return value: %TRUE if the #ClutterMasterClock has at least
* one running timeline
*/
static gboolean
master_clock_is_running (ClutterMasterClockDefault *master_clock)
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
stages = clutter_stage_manager_peek_stages (stage_manager);
if (master_clock->paused)
return FALSE;
if (master_clock->timelines)
return TRUE;
for (l = stages; l; l = l->next)
{
if (_clutter_stage_has_queued_events (l->data) ||
_clutter_stage_needs_update (l->data))
return TRUE;
}
if (master_clock->ensure_next_iteration)
{
master_clock->ensure_next_iteration = FALSE;
return TRUE;
}
return FALSE;
}
static gint
master_clock_get_swap_wait_time (ClutterMasterClockDefault *master_clock)
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
gint64 min_update_time = -1;
stages = clutter_stage_manager_peek_stages (stage_manager);
for (l = stages; l != NULL; l = l->next)
{
gint64 update_time = _clutter_stage_get_update_time (l->data);
if (min_update_time == -1 ||
(update_time != -1 && update_time < min_update_time))
min_update_time = update_time;
}
if (min_update_time == -1)
{
return -1;
}
else
{
gint64 now = g_source_get_time (master_clock->source);
if (min_update_time < now)
{
return 0;
}
else
{
gint64 delay_us = min_update_time - now;
return (delay_us + 999) / 1000;
}
}
}
static void
master_clock_schedule_stage_updates (ClutterMasterClockDefault *master_clock)
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
stages = clutter_stage_manager_peek_stages (stage_manager);
for (l = stages; l != NULL; l = l->next)
_clutter_stage_schedule_update (l->data);
}
static GSList *
master_clock_list_ready_stages (ClutterMasterClockDefault *master_clock)
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
GSList *result;
stages = clutter_stage_manager_peek_stages (stage_manager);
result = NULL;
for (l = stages; l != NULL; l = l->next)
{
gint64 update_time = _clutter_stage_get_update_time (l->data);
/* If a stage has a swap-buffers pending we don't want to draw to it
* in case the driver may block the CPU while it waits for the next
* backbuffer to become available.
*
* TODO: We should be able to identify if we are running triple or N
* buffered and in these cases we can still draw if there is 1 swap
* pending so we can hopefully always be ready to swap for the next
* vblank and really match the vsync frequency.
*/
if (update_time != -1 && update_time <= master_clock->cur_tick)
result = g_slist_prepend (result, g_object_ref (l->data));
}
return g_slist_reverse (result);
}
static void
master_clock_reschedule_stage_updates (ClutterMasterClockDefault *master_clock,
GSList *stages)
{
const GSList *l;
for (l = stages; l != NULL; l = l->next)
{
/* Clear the old update time */
_clutter_stage_clear_update_time (l->data);
/* And if there is still work to be done, schedule a new one */
if (master_clock->timelines ||
_clutter_stage_has_queued_events (l->data) ||
_clutter_stage_needs_update (l->data))
_clutter_stage_schedule_update (l->data);
}
}
/*
* master_clock_next_frame_delay:
* @master_clock: a #ClutterMasterClock
*
* Computes the number of delay before we need to draw the next frame.
*
* Return value: -1 if there is no next frame pending, otherwise the
* number of millseconds before the we need to draw the next frame
*/
static gint
master_clock_next_frame_delay (ClutterMasterClockDefault *master_clock)
{
gint64 now, next;
gint swap_delay;
if (!master_clock_is_running (master_clock))
return -1;
/* If all of the stages are busy waiting for a swap-buffers to complete
* then we wait for one to be ready.. */
swap_delay = master_clock_get_swap_wait_time (master_clock);
if (swap_delay != 0)
return swap_delay;
/* When we have sync-to-vblank, we count on swap-buffer requests (or
* swap-buffer-complete events if supported in the backend) to throttle our
* frame rate so no additional delay is needed to start the next frame.
*
* If the master-clock has become idle due to no timeline progression causing
* redraws then we can no longer rely on vblank synchronization because the
* last real stage update/redraw may have happened a long time ago and so we
* fallback to polling for timeline progressions every 1/frame_rate seconds.
*
* (NB: if there aren't even any timelines running then the master clock will
* be completely stopped in master_clock_is_running())
*/
if (clutter_feature_available (CLUTTER_FEATURE_SYNC_TO_VBLANK) &&
!master_clock->idle)
{
CLUTTER_NOTE (SCHEDULER, "vblank available and updated stages");
return 0;
}
if (master_clock->prev_tick == 0)
{
/* If we weren't previously running, then draw the next frame
* immediately
*/
CLUTTER_NOTE (SCHEDULER, "draw the first frame immediately");
return 0;
}
/* Otherwise, wait at least 1/frame_rate seconds since we last
* started a frame
*/
now = g_source_get_time (master_clock->source);
next = master_clock->prev_tick;
/* If time has gone backwards then there's no way of knowing how
long we should wait so let's just dispatch immediately */
if (now <= next)
{
CLUTTER_NOTE (SCHEDULER, "Time has gone backwards");
return 0;
}
next += (1000000L / clutter_get_default_frame_rate ());
if (next <= now)
{
CLUTTER_NOTE (SCHEDULER, "Less than %lu microsecs",
1000000L / (gulong) clutter_get_default_frame_rate ());
return 0;
}
else
{
CLUTTER_NOTE (SCHEDULER, "Waiting %" G_GINT64_FORMAT " msecs",
(next - now) / 1000);
return (next - now) / 1000;
}
}
static void
master_clock_process_events (ClutterMasterClockDefault *master_clock,
GSList *stages)
{
GSList *l;
#ifdef CLUTTER_ENABLE_DEBUG
gint64 start = g_get_monotonic_time ();
#endif
CLUTTER_STATIC_TIMER (master_event_process,
"Master Clock",
"Event Processing",
"The time spent processing events on all stages",
0);
CLUTTER_TIMER_START (_clutter_uprof_context, master_event_process);
/* Process queued events */
for (l = stages; l != NULL; l = l->next)
_clutter_stage_process_queued_events (l->data);
CLUTTER_TIMER_STOP (_clutter_uprof_context, master_event_process);
#ifdef CLUTTER_ENABLE_DEBUG
if (_clutter_diagnostic_enabled ())
clutter_warn_if_over_budget (master_clock, start, "Event processing");
master_clock->remaining_budget -= (g_get_monotonic_time () - start);
#endif
}
/*
* master_clock_advance_timelines:
* @master_clock: a #ClutterMasterClock
*
* Advances all the timelines held by the master clock. This function
* should be called before calling _clutter_stage_do_update() to
* make sure that all the timelines are advanced and the scene is updated.
*/
static void
master_clock_advance_timelines (ClutterMasterClockDefault *master_clock)
{
GSList *timelines, *l;
#ifdef CLUTTER_ENABLE_DEBUG
gint64 start = g_get_monotonic_time ();
#endif
CLUTTER_STATIC_TIMER (master_timeline_advance,
"Master Clock",
"Timelines Advancement",
"The time spent advancing all timelines",
0);
/* we protect ourselves from timelines being removed during
* the advancement by other timelines by copying the list of
* timelines, taking a reference on them, iterating over the
* copied list and then releasing the reference.
*
* we cannot simply take a reference on the timelines and still
* use the list held by the master clock because the do_tick()
* might result in the creation of a new timeline, which gets
* added at the end of the list with no reference increase and
* thus gets disposed at the end of the iteration.
*
* this implies that a newly added timeline will not be advanced
* by this clock iteration, which is perfectly fine since we're
* in its first cycle.
*
* we also cannot steal the master clock timelines list because
* a timeline might be removed as the direct result of do_tick()
* and remove_timeline() would not find the timeline, failing
* and leaving a dangling pointer behind.
*/
timelines = g_slist_copy (master_clock->timelines);
g_slist_foreach (timelines, (GFunc) g_object_ref, NULL);
CLUTTER_TIMER_START (_clutter_uprof_context, master_timeline_advance);
for (l = timelines; l != NULL; l = l->next)
_clutter_timeline_do_tick (l->data, master_clock->cur_tick / 1000);
CLUTTER_TIMER_STOP (_clutter_uprof_context, master_timeline_advance);
g_slist_foreach (timelines, (GFunc) g_object_unref, NULL);
g_slist_free (timelines);
#ifdef CLUTTER_ENABLE_DEBUG
if (_clutter_diagnostic_enabled ())
clutter_warn_if_over_budget (master_clock, start, "Animations");
master_clock->remaining_budget -= (g_get_monotonic_time () - start);
#endif
}
static gboolean
master_clock_update_stages (ClutterMasterClockDefault *master_clock,
GSList *stages)
{
gboolean stages_updated = FALSE;
GSList *l;
#ifdef CLUTTER_ENABLE_DEBUG
gint64 start = g_get_monotonic_time ();
#endif
_clutter_run_repaint_functions (CLUTTER_REPAINT_FLAGS_PRE_PAINT);
/* Update any stage that needs redraw/relayout after the clock
* is advanced.
*/
for (l = stages; l != NULL; l = l->next)
stages_updated |= _clutter_stage_do_update (l->data);
_clutter_run_repaint_functions (CLUTTER_REPAINT_FLAGS_POST_PAINT);
#ifdef CLUTTER_ENABLE_DEBUG
if (_clutter_diagnostic_enabled ())
clutter_warn_if_over_budget (master_clock, start, "Updating the stage");
master_clock->remaining_budget -= (g_get_monotonic_time () - start);
#endif
return stages_updated;
}
/*
* clutter_clock_source_new:
* @master_clock: a #ClutterMasterClock for the source
*
* The #ClutterClockSource is an idle GSource that will queue a redraw
* if @master_clock has at least a running #ClutterTimeline. The redraw
* will cause @master_clock to advance all timelines, thus advancing all
* animations as well.
*
* Return value: the newly created #GSource
*/
static GSource *
clutter_clock_source_new (ClutterMasterClockDefault *master_clock)
{
GSource *source = g_source_new (&clock_funcs, sizeof (ClutterClockSource));
ClutterClockSource *clock_source = (ClutterClockSource *) source;
g_source_set_name (source, "Clutter master clock");
clock_source->master_clock = master_clock;
return source;
}
static gboolean
clutter_clock_prepare (GSource *source,
gint *timeout)
{
ClutterClockSource *clock_source = (ClutterClockSource *) source;
ClutterMasterClockDefault *master_clock = clock_source->master_clock;
int delay;
_clutter_threads_acquire_lock ();
if (G_UNLIKELY (clutter_paint_debug_flags &
CLUTTER_DEBUG_CONTINUOUS_REDRAW))
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
stages = clutter_stage_manager_peek_stages (stage_manager);
/* Queue a full redraw on all of the stages */
for (l = stages; l != NULL; l = l->next)
clutter_actor_queue_redraw (l->data);
}
delay = master_clock_next_frame_delay (master_clock);
_clutter_threads_release_lock ();
*timeout = delay;
return delay == 0;
}
static gboolean
clutter_clock_check (GSource *source)
{
ClutterClockSource *clock_source = (ClutterClockSource *) source;
ClutterMasterClockDefault *master_clock = clock_source->master_clock;
int delay;
_clutter_threads_acquire_lock ();
delay = master_clock_next_frame_delay (master_clock);
_clutter_threads_release_lock ();
return delay == 0;
}
static gboolean
clutter_clock_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
ClutterClockSource *clock_source = (ClutterClockSource *) source;
ClutterMasterClockDefault *master_clock = clock_source->master_clock;
gboolean stages_updated = FALSE;
GSList *stages;
CLUTTER_STATIC_TIMER (master_dispatch_timer,
"Mainloop",
"Master Clock",
"Master clock dispatch",
0);
CLUTTER_TIMER_START (_clutter_uprof_context, master_dispatch_timer);
CLUTTER_NOTE (SCHEDULER, "Master clock [tick]");
_clutter_threads_acquire_lock ();
/* Get the time to use for this frame */
master_clock->cur_tick = g_source_get_time (source);
#ifdef CLUTTER_ENABLE_DEBUG
master_clock->remaining_budget = master_clock->frame_budget;
#endif
/* We need to protect ourselves against stages being destroyed during
* event handling - master_clock_list_ready_stages() returns a
* list of referenced that we'll unref afterwards.
*/
stages = master_clock_list_ready_stages (master_clock);
master_clock->idle = FALSE;
/* Each frame is split into three separate phases: */
/* 1. process all the events; each stage goes through its events queue
* and processes each event according to its type, then emits the
* various signals that are associated with the event
*/
master_clock_process_events (master_clock, stages);
/* 2. advance the timelines */
master_clock_advance_timelines (master_clock);
/* 3. relayout and redraw the stages */
stages_updated = master_clock_update_stages (master_clock, stages);
/* The master clock goes idle if no stages were updated and falls back
* to polling for timeline progressions... */
if (!stages_updated)
master_clock->idle = TRUE;
master_clock_reschedule_stage_updates (master_clock, stages);
g_slist_foreach (stages, (GFunc) g_object_unref, NULL);
g_slist_free (stages);
master_clock->prev_tick = master_clock->cur_tick;
_clutter_threads_release_lock ();
CLUTTER_TIMER_STOP (_clutter_uprof_context, master_dispatch_timer);
return TRUE;
}
static void
clutter_master_clock_default_finalize (GObject *gobject)
{
ClutterMasterClockDefault *master_clock = CLUTTER_MASTER_CLOCK_DEFAULT (gobject);
g_slist_free (master_clock->timelines);
G_OBJECT_CLASS (clutter_master_clock_default_parent_class)->finalize (gobject);
}
static void
clutter_master_clock_default_class_init (ClutterMasterClockDefaultClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = clutter_master_clock_default_finalize;
}
static void
clutter_master_clock_default_init (ClutterMasterClockDefault *self)
{
GSource *source;
source = clutter_clock_source_new (self);
self->source = source;
self->idle = FALSE;
self->ensure_next_iteration = FALSE;
self->paused = FALSE;
#ifdef CLUTTER_ENABLE_DEBUG
self->frame_budget = G_USEC_PER_SEC / 60;
#endif
g_source_set_priority (source, CLUTTER_PRIORITY_REDRAW);
g_source_set_can_recurse (source, FALSE);
g_source_attach (source, NULL);
}
static void
clutter_master_clock_default_add_timeline (ClutterMasterClock *clock,
ClutterTimeline *timeline)
{
ClutterMasterClockDefault *master_clock = (ClutterMasterClockDefault *) clock;
gboolean is_first;
if (g_slist_find (master_clock->timelines, timeline))
return;
is_first = master_clock->timelines == NULL;
master_clock->timelines = g_slist_prepend (master_clock->timelines,
timeline);
if (is_first)
{
master_clock_schedule_stage_updates (master_clock);
_clutter_master_clock_start_running (clock);
}
}
static void
clutter_master_clock_default_remove_timeline (ClutterMasterClock *clock,
ClutterTimeline *timeline)
{
ClutterMasterClockDefault *master_clock = (ClutterMasterClockDefault *) clock;
master_clock->timelines = g_slist_remove (master_clock->timelines,
timeline);
}
static void
clutter_master_clock_default_start_running (ClutterMasterClock *master_clock)
{
/* If called from a different thread, we need to wake up the
* main loop to start running the timelines
*/
g_main_context_wakeup (NULL);
}
static void
clutter_master_clock_default_ensure_next_iteration (ClutterMasterClock *clock)
{
ClutterMasterClockDefault *master_clock = (ClutterMasterClockDefault *) clock;
master_clock->ensure_next_iteration = TRUE;
}
static void
clutter_master_clock_default_set_paused (ClutterMasterClock *clock,
gboolean paused)
{
ClutterMasterClockDefault *master_clock = (ClutterMasterClockDefault *) clock;
master_clock->paused = !!paused;
}
static void
clutter_master_clock_iface_init (ClutterMasterClockIface *iface)
{
iface->add_timeline = clutter_master_clock_default_add_timeline;
iface->remove_timeline = clutter_master_clock_default_remove_timeline;
iface->start_running = clutter_master_clock_default_start_running;
iface->ensure_next_iteration = clutter_master_clock_default_ensure_next_iteration;
iface->set_paused = clutter_master_clock_default_set_paused;
}

48
clutter/clutter-master-clock-default.h Normal file
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@ -0,0 +1,48 @@
/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By: Lionel Landwerlin <lionel.g.landwerlin@linux.intel.com>
*
* Copyright (C) 2015 Intel Corporation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef __CLUTTER_MASTER_CLOCK_DEFAULT_H__
#define __CLUTTER_MASTER_CLOCK_DEFAULT_H__
#include <clutter/clutter-timeline.h>
G_BEGIN_DECLS
#define CLUTTER_TYPE_MASTER_CLOCK_DEFAULT (_clutter_master_clock_default_get_type ())
#define CLUTTER_MASTER_CLOCK_DEFAULT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_MASTER_CLOCK_DEFAULT, ClutterMasterClockDefault))
#define CLUTTER_IS_MASTER_CLOCK_DEFAULT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_MASTER_CLOCK_DEFAULT))
#define CLUTTER_MASTER_CLOCK_DEFAULT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_MASTER_CLOCK_DEFAULT, ClutterMasterClockDefaultClass))
typedef struct _ClutterMasterClockDefault ClutterMasterClockDefault;
typedef struct _ClutterMasterClockDefaultClass ClutterMasterClockDefaultClass;
struct _ClutterMasterClockDefaultClass
{
GObjectClass parent_class;
};
GType _clutter_master_clock_default_get_type (void) G_GNUC_CONST;
G_END_DECLS
#endif /* __CLUTTER_MASTER_CLOCK_DEFAULT_H__ */

657
clutter/clutter-master-clock.c
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@ -36,640 +36,30 @@
#endif
#include "clutter-master-clock.h"
#include "clutter-debug.h"
#include "clutter-master-clock-default.h"
#include "clutter-private.h"
#include "clutter-profile.h"
#include "clutter-stage-manager-private.h"
#include "clutter-stage-private.h"
#define CLUTTER_MASTER_CLOCK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_MASTER_CLOCK, ClutterMasterClockClass))
#define CLUTTER_IS_MASTER_CLOCK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_MASTER_CLOCK))
#define CLUTTER_MASTER_CLASS_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_MASTER_CLOCK, ClutterMasterClockClass))
#ifdef CLUTTER_ENABLE_DEBUG
#define clutter_warn_if_over_budget(master_clock,start_time,section) G_STMT_START { \
gint64 __delta = g_get_monotonic_time () - start_time; \
gint64 __budget = master_clock->remaining_budget; \
if (__budget > 0 && __delta >= __budget) { \
_clutter_diagnostic_message ("%s took %" G_GINT64_FORMAT " microseconds " \
"more than the remaining budget of %" G_GINT64_FORMAT \
" microseconds", \
section, __delta - __budget, __budget); \
} } G_STMT_END
#else
#define clutter_warn_if_over_budget(master_clock,start_time,section)
#endif
typedef struct _ClutterClockSource ClutterClockSource;
typedef struct _ClutterMasterClockClass ClutterMasterClockClass;
struct _ClutterMasterClock
{
GObject parent_instance;
/* the list of timelines handled by the clock */
GSList *timelines;
/* the current state of the clock, in usecs */
gint64 cur_tick;
/* the previous state of the clock, in usecs, used to compute the delta */
gint64 prev_tick;
#ifdef CLUTTER_ENABLE_DEBUG
gint64 frame_budget;
gint64 remaining_budget;
#endif
/* an idle source, used by the Master Clock to queue
* a redraw on the stage and drive the animations
*/
GSource *source;
/* If the master clock is idle that means it has
* fallen back to idle polling for timeline
* progressions and it may have been some time since
* the last real stage update.
*/
guint idle : 1;
guint ensure_next_iteration : 1;
guint paused : 1;
};
struct _ClutterMasterClockClass
{
GObjectClass parent_class;
};
struct _ClutterClockSource
{
GSource source;
ClutterMasterClock *master_clock;
};
static gboolean clutter_clock_prepare (GSource *source,
gint *timeout);
static gboolean clutter_clock_check (GSource *source);
static gboolean clutter_clock_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data);
static GSourceFuncs clock_funcs = {
clutter_clock_prepare,
clutter_clock_check,
clutter_clock_dispatch,
NULL
};
#define clutter_master_clock_get_type _clutter_master_clock_get_type
G_DEFINE_TYPE (ClutterMasterClock, clutter_master_clock, G_TYPE_OBJECT);
typedef ClutterMasterClockIface ClutterMasterClockInterface;
/*
* master_clock_is_running:
* @master_clock: a #ClutterMasterClock
*
* Checks if we should currently be advancing timelines or redrawing
* stages.
*
* Return value: %TRUE if the #ClutterMasterClock has at least
* one running timeline
*/
static gboolean
master_clock_is_running (ClutterMasterClock *master_clock)
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
stages = clutter_stage_manager_peek_stages (stage_manager);
if (master_clock->paused)
return FALSE;
if (master_clock->timelines)
return TRUE;
for (l = stages; l; l = l->next)
{
if (_clutter_stage_has_queued_events (l->data) ||
_clutter_stage_needs_update (l->data))
return TRUE;
}
if (master_clock->ensure_next_iteration)
{
master_clock->ensure_next_iteration = FALSE;
return TRUE;
}
return FALSE;
}
static gint
master_clock_get_swap_wait_time (ClutterMasterClock *master_clock)
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
gint64 min_update_time = -1;
stages = clutter_stage_manager_peek_stages (stage_manager);
for (l = stages; l != NULL; l = l->next)
{
gint64 update_time = _clutter_stage_get_update_time (l->data);
if (min_update_time == -1 ||
(update_time != -1 && update_time < min_update_time))
min_update_time = update_time;
}
if (min_update_time == -1)
{
return -1;
}
else
{
gint64 now = g_source_get_time (master_clock->source);
if (min_update_time < now)
{
return 0;
}
else
{
gint64 delay_us = min_update_time - now;
return (delay_us + 999) / 1000;
}
}
}
G_DEFINE_INTERFACE (ClutterMasterClock, clutter_master_clock, G_TYPE_OBJECT)
static void
master_clock_schedule_stage_updates (ClutterMasterClock *master_clock)
clutter_master_clock_default_init (ClutterMasterClockInterface *iface)
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
stages = clutter_stage_manager_peek_stages (stage_manager);
for (l = stages; l != NULL; l = l->next)
_clutter_stage_schedule_update (l->data);
}
static GSList *
master_clock_list_ready_stages (ClutterMasterClock *master_clock)
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
GSList *result;
stages = clutter_stage_manager_peek_stages (stage_manager);
result = NULL;
for (l = stages; l != NULL; l = l->next)
{
gint64 update_time = _clutter_stage_get_update_time (l->data);
/* If a stage has a swap-buffers pending we don't want to draw to it
* in case the driver may block the CPU while it waits for the next
* backbuffer to become available.
*
* TODO: We should be able to identify if we are running triple or N
* buffered and in these cases we can still draw if there is 1 swap
* pending so we can hopefully always be ready to swap for the next
* vblank and really match the vsync frequency.
*/
if (update_time != -1 && update_time <= master_clock->cur_tick)
result = g_slist_prepend (result, g_object_ref (l->data));
}
return g_slist_reverse (result);
}
static void
master_clock_reschedule_stage_updates (ClutterMasterClock *master_clock,
GSList *stages)
{
const GSList *l;
for (l = stages; l != NULL; l = l->next)
{
/* Clear the old update time */
_clutter_stage_clear_update_time (l->data);
/* And if there is still work to be done, schedule a new one */
if (master_clock->timelines ||
_clutter_stage_has_queued_events (l->data) ||
_clutter_stage_needs_update (l->data))
_clutter_stage_schedule_update (l->data);
}
}
/*
* master_clock_next_frame_delay:
* @master_clock: a #ClutterMasterClock
*
* Computes the number of delay before we need to draw the next frame.
*
* Return value: -1 if there is no next frame pending, otherwise the
* number of millseconds before the we need to draw the next frame
*/
static gint
master_clock_next_frame_delay (ClutterMasterClock *master_clock)
{
gint64 now, next;
gint swap_delay;
if (!master_clock_is_running (master_clock))
return -1;
/* If all of the stages are busy waiting for a swap-buffers to complete
* then we wait for one to be ready.. */
swap_delay = master_clock_get_swap_wait_time (master_clock);
if (swap_delay != 0)
return swap_delay;
/* When we have sync-to-vblank, we count on swap-buffer requests (or
* swap-buffer-complete events if supported in the backend) to throttle our
* frame rate so no additional delay is needed to start the next frame.
*
* If the master-clock has become idle due to no timeline progression causing
* redraws then we can no longer rely on vblank synchronization because the
* last real stage update/redraw may have happened a long time ago and so we
* fallback to polling for timeline progressions every 1/frame_rate seconds.
*
* (NB: if there aren't even any timelines running then the master clock will
* be completely stopped in master_clock_is_running())
*/
if (clutter_feature_available (CLUTTER_FEATURE_SYNC_TO_VBLANK) &&
!master_clock->idle)
{
CLUTTER_NOTE (SCHEDULER, "vblank available and updated stages");
return 0;
}
if (master_clock->prev_tick == 0)
{
/* If we weren't previously running, then draw the next frame
* immediately
*/
CLUTTER_NOTE (SCHEDULER, "draw the first frame immediately");
return 0;
}
/* Otherwise, wait at least 1/frame_rate seconds since we last
* started a frame
*/
now = g_source_get_time (master_clock->source);
next = master_clock->prev_tick;
/* If time has gone backwards then there's no way of knowing how
long we should wait so let's just dispatch immediately */
if (now <= next)
{
CLUTTER_NOTE (SCHEDULER, "Time has gone backwards");
return 0;
}
next += (1000000L / clutter_get_default_frame_rate ());
if (next <= now)
{
CLUTTER_NOTE (SCHEDULER, "Less than %lu microsecs",
1000000L / (gulong) clutter_get_default_frame_rate ());
return 0;
}
else
{
CLUTTER_NOTE (SCHEDULER, "Waiting %" G_GINT64_FORMAT " msecs",
(next - now) / 1000);
return (next - now) / 1000;
}
}
static void
master_clock_process_events (ClutterMasterClock *master_clock,
GSList *stages)
{
GSList *l;
#ifdef CLUTTER_ENABLE_DEBUG
gint64 start = g_get_monotonic_time ();
#endif
CLUTTER_STATIC_TIMER (master_event_process,
"Master Clock",
"Event Processing",
"The time spent processing events on all stages",
0);
CLUTTER_TIMER_START (_clutter_uprof_context, master_event_process);
/* Process queued events */
for (l = stages; l != NULL; l = l->next)
_clutter_stage_process_queued_events (l->data);
CLUTTER_TIMER_STOP (_clutter_uprof_context, master_event_process);
#ifdef CLUTTER_ENABLE_DEBUG
if (_clutter_diagnostic_enabled ())
clutter_warn_if_over_budget (master_clock, start, "Event processing");
master_clock->remaining_budget -= (g_get_monotonic_time () - start);
#endif
}
/*
* master_clock_advance_timelines:
* @master_clock: a #ClutterMasterClock
*
* Advances all the timelines held by the master clock. This function
* should be called before calling _clutter_stage_do_update() to
* make sure that all the timelines are advanced and the scene is updated.
*/
static void
master_clock_advance_timelines (ClutterMasterClock *master_clock)
{
GSList *timelines, *l;
#ifdef CLUTTER_ENABLE_DEBUG
gint64 start = g_get_monotonic_time ();
#endif
CLUTTER_STATIC_TIMER (master_timeline_advance,
"Master Clock",
"Timelines Advancement",
"The time spent advancing all timelines",
0);
/* we protect ourselves from timelines being removed during
* the advancement by other timelines by copying the list of
* timelines, taking a reference on them, iterating over the
* copied list and then releasing the reference.
*
* we cannot simply take a reference on the timelines and still
* use the list held by the master clock because the do_tick()
* might result in the creation of a new timeline, which gets
* added at the end of the list with no reference increase and
* thus gets disposed at the end of the iteration.
*
* this implies that a newly added timeline will not be advanced
* by this clock iteration, which is perfectly fine since we're
* in its first cycle.
*
* we also cannot steal the master clock timelines list because
* a timeline might be removed as the direct result of do_tick()
* and remove_timeline() would not find the timeline, failing
* and leaving a dangling pointer behind.
*/
timelines = g_slist_copy (master_clock->timelines);
g_slist_foreach (timelines, (GFunc) g_object_ref, NULL);
CLUTTER_TIMER_START (_clutter_uprof_context, master_timeline_advance);
for (l = timelines; l != NULL; l = l->next)
_clutter_timeline_do_tick (l->data, master_clock->cur_tick / 1000);
CLUTTER_TIMER_STOP (_clutter_uprof_context, master_timeline_advance);
g_slist_foreach (timelines, (GFunc) g_object_unref, NULL);
g_slist_free (timelines);
#ifdef CLUTTER_ENABLE_DEBUG
if (_clutter_diagnostic_enabled ())
clutter_warn_if_over_budget (master_clock, start, "Animations");
master_clock->remaining_budget -= (g_get_monotonic_time () - start);
#endif
}
static gboolean
master_clock_update_stages (ClutterMasterClock *master_clock,
GSList *stages)
{
gboolean stages_updated = FALSE;
GSList *l;
#ifdef CLUTTER_ENABLE_DEBUG
gint64 start = g_get_monotonic_time ();
#endif
_clutter_run_repaint_functions (CLUTTER_REPAINT_FLAGS_PRE_PAINT);
/* Update any stage that needs redraw/relayout after the clock
* is advanced.
*/
for (l = stages; l != NULL; l = l->next)
stages_updated |= _clutter_stage_do_update (l->data);
_clutter_run_repaint_functions (CLUTTER_REPAINT_FLAGS_POST_PAINT);
#ifdef CLUTTER_ENABLE_DEBUG
if (_clutter_diagnostic_enabled ())
clutter_warn_if_over_budget (master_clock, start, "Updating the stage");
master_clock->remaining_budget -= (g_get_monotonic_time () - start);
#endif
return stages_updated;
}
/*
* clutter_clock_source_new:
* @master_clock: a #ClutterMasterClock for the source
*
* The #ClutterClockSource is an idle GSource that will queue a redraw
* if @master_clock has at least a running #ClutterTimeline. The redraw
* will cause @master_clock to advance all timelines, thus advancing all
* animations as well.
*
* Return value: the newly created #GSource
*/
static GSource *
clutter_clock_source_new (ClutterMasterClock *master_clock)
{
GSource *source = g_source_new (&clock_funcs, sizeof (ClutterClockSource));
ClutterClockSource *clock_source = (ClutterClockSource *) source;
g_source_set_name (source, "Clutter master clock");
clock_source->master_clock = master_clock;
return source;
}
static gboolean
clutter_clock_prepare (GSource *source,
gint *timeout)
{
ClutterClockSource *clock_source = (ClutterClockSource *) source;
ClutterMasterClock *master_clock = clock_source->master_clock;
int delay;
_clutter_threads_acquire_lock ();
if (G_UNLIKELY (clutter_paint_debug_flags &
CLUTTER_DEBUG_CONTINUOUS_REDRAW))
{
ClutterStageManager *stage_manager = clutter_stage_manager_get_default ();
const GSList *stages, *l;
stages = clutter_stage_manager_peek_stages (stage_manager);
/* Queue a full redraw on all of the stages */
for (l = stages; l != NULL; l = l->next)
clutter_actor_queue_redraw (l->data);
}
delay = master_clock_next_frame_delay (master_clock);
_clutter_threads_release_lock ();
*timeout = delay;
return delay == 0;
}
static gboolean
clutter_clock_check (GSource *source)
{
ClutterClockSource *clock_source = (ClutterClockSource *) source;
ClutterMasterClock *master_clock = clock_source->master_clock;
int delay;
_clutter_threads_acquire_lock ();
delay = master_clock_next_frame_delay (master_clock);
_clutter_threads_release_lock ();
return delay == 0;
}
static gboolean
clutter_clock_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
ClutterClockSource *clock_source = (ClutterClockSource *) source;
ClutterMasterClock *master_clock = clock_source->master_clock;
gboolean stages_updated = FALSE;
GSList *stages;
CLUTTER_STATIC_TIMER (master_dispatch_timer,
"Mainloop",
"Master Clock",
"Master clock dispatch",
0);
CLUTTER_TIMER_START (_clutter_uprof_context, master_dispatch_timer);
CLUTTER_NOTE (SCHEDULER, "Master clock [tick]");
_clutter_threads_acquire_lock ();
/* Get the time to use for this frame */
master_clock->cur_tick = g_source_get_time (source);
#ifdef CLUTTER_ENABLE_DEBUG
master_clock->remaining_budget = master_clock->frame_budget;
#endif
/* We need to protect ourselves against stages being destroyed during
* event handling - master_clock_list_ready_stages() returns a
* list of referenced that we'll unref afterwards.
*/
stages = master_clock_list_ready_stages (master_clock);
master_clock->idle = FALSE;
/* Each frame is split into three separate phases: */
/* 1. process all the events; each stage goes through its events queue
* and processes each event according to its type, then emits the
* various signals that are associated with the event
*/
master_clock_process_events (master_clock, stages);
/* 2. advance the timelines */
master_clock_advance_timelines (master_clock);
/* 3. relayout and redraw the stages */
stages_updated = master_clock_update_stages (master_clock, stages);
/* The master clock goes idle if no stages were updated and falls back
* to polling for timeline progressions... */
if (!stages_updated)
master_clock->idle = TRUE;
master_clock_reschedule_stage_updates (master_clock, stages);
g_slist_foreach (stages, (GFunc) g_object_unref, NULL);
g_slist_free (stages);
master_clock->prev_tick = master_clock->cur_tick;
_clutter_threads_release_lock ();
CLUTTER_TIMER_STOP (_clutter_uprof_context, master_dispatch_timer);
return TRUE;
}
static void
clutter_master_clock_finalize (GObject *gobject)
{
ClutterMasterClock *master_clock = CLUTTER_MASTER_CLOCK (gobject);
g_slist_free (master_clock->timelines);
G_OBJECT_CLASS (clutter_master_clock_parent_class)->finalize (gobject);
}
static void
clutter_master_clock_class_init (ClutterMasterClockClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = clutter_master_clock_finalize;
}
static void
clutter_master_clock_init (ClutterMasterClock *self)
{
GSource *source;
source = clutter_clock_source_new (self);
self->source = source;
self->idle = FALSE;
self->ensure_next_iteration = FALSE;
self->paused = FALSE;
#ifdef CLUTTER_ENABLE_DEBUG
self->frame_budget = G_USEC_PER_SEC / 60;
#endif
g_source_set_priority (source, CLUTTER_PRIORITY_REDRAW);
g_source_set_can_recurse (source, FALSE);
g_source_attach (source, NULL);
}
/*
* _clutter_master_clock_get_default:
*
* Retrieves the default master clock. If this function has never
* been called before, the default master clock is created.
*
* Return value: the default master clock. The returned object is
* owned by Clutter and should not be modified or freed
*/
ClutterMasterClock *
_clutter_master_clock_get_default (void)
{
ClutterMainContext *context = _clutter_context_get_default ();
if (G_UNLIKELY (context->master_clock == NULL))
context->master_clock = g_object_new (CLUTTER_TYPE_MASTER_CLOCK, NULL);
context->master_clock = g_object_new (CLUTTER_TYPE_MASTER_CLOCK_DEFAULT, NULL);
return context->master_clock;
}
/*
@ -684,21 +74,10 @@ void
_clutter_master_clock_add_timeline (ClutterMasterClock *master_clock,
ClutterTimeline *timeline)
{
gboolean is_first;
g_return_if_fail (CLUTTER_IS_MASTER_CLOCK (master_clock));
if (g_slist_find (master_clock->timelines, timeline))
return;
is_first = master_clock->timelines == NULL;
master_clock->timelines = g_slist_prepend (master_clock->timelines,
timeline);
if (is_first)
{
master_clock_schedule_stage_updates (master_clock);
_clutter_master_clock_start_running (master_clock);
}
CLUTTER_MASTER_CLOCK_GET_IFACE (master_clock)->add_timeline (master_clock,
timeline);
}
/*
@ -713,8 +92,10 @@ void
_clutter_master_clock_remove_timeline (ClutterMasterClock *master_clock,
ClutterTimeline *timeline)
{
master_clock->timelines = g_slist_remove (master_clock->timelines,
timeline);
g_return_if_fail (CLUTTER_IS_MASTER_CLOCK (master_clock));
CLUTTER_MASTER_CLOCK_GET_IFACE (master_clock)->remove_timeline (master_clock,
timeline);
}
/*
@ -727,10 +108,9 @@ _clutter_master_clock_remove_timeline (ClutterMasterClock *master_clock,
void
_clutter_master_clock_start_running (ClutterMasterClock *master_clock)
{
/* If called from a different thread, we need to wake up the
* main loop to start running the timelines
*/
g_main_context_wakeup (NULL);
g_return_if_fail (CLUTTER_IS_MASTER_CLOCK (master_clock));
CLUTTER_MASTER_CLOCK_GET_IFACE (master_clock)->start_running (master_clock);
}
/**
@ -744,7 +124,7 @@ _clutter_master_clock_ensure_next_iteration (ClutterMasterClock *master_clock)
{
g_return_if_fail (CLUTTER_IS_MASTER_CLOCK (master_clock));
master_clock->ensure_next_iteration = TRUE;
CLUTTER_MASTER_CLOCK_GET_IFACE (master_clock)->ensure_next_iteration (master_clock);
}
void
@ -753,5 +133,6 @@ _clutter_master_clock_set_paused (ClutterMasterClock *master_clock,
{
g_return_if_fail (CLUTTER_IS_MASTER_CLOCK (master_clock));
master_clock->paused = !!paused;
CLUTTER_MASTER_CLOCK_GET_IFACE (master_clock)->set_paused (master_clock,
!!paused);
}

25
clutter/clutter-master-clock.h
View File

@ -28,11 +28,28 @@
G_BEGIN_DECLS
#define CLUTTER_TYPE_MASTER_CLOCK (_clutter_master_clock_get_type ())
#define CLUTTER_MASTER_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_MASTER_CLOCK, ClutterMasterClock))
#define CLUTTER_IS_MASTER_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_MASTER_CLOCK))
#define CLUTTER_TYPE_MASTER_CLOCK (_clutter_master_clock_get_type ())
#define CLUTTER_MASTER_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_MASTER_CLOCK, ClutterMasterClock))
#define CLUTTER_IS_MASTER_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_MASTER_CLOCK))
#define CLUTTER_MASTER_CLOCK_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), CLUTTER_TYPE_MASTER_CLOCK, ClutterMasterClockIface))
typedef struct _ClutterMasterClock ClutterMasterClock;
typedef struct _ClutterMasterClock ClutterMasterClock; /* dummy */
typedef struct _ClutterMasterClockIface ClutterMasterClockIface;
struct _ClutterMasterClockIface
{
/*< private >*/
GTypeInterface parent_iface;
void (* add_timeline) (ClutterMasterClock *master_clock,
ClutterTimeline *timeline);
void (* remove_timeline) (ClutterMasterClock *master_clock,
ClutterTimeline *timeline);
void (* start_running) (ClutterMasterClock *master_clock);
void (* ensure_next_iteration) (ClutterMasterClock *master_clock);
void (* set_paused) (ClutterMasterClock *master_clock,
gboolean paused);
};
GType _clutter_master_clock_get_type (void) G_GNUC_CONST;