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clutter/frame-clock: Handle immediate present feedback

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In certain scenarios, the frame clock needs to handle present feedback
long before the assumed presentation time happens. To avoid scheduling
the next frame to soon, avoid scheduling one if we were presented half a
frame interval within the last expected presentation time.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1285
This commit is contained in:
Jonas Ådahl
2020-03-20 16:03:34 +01:00
parent 96a108ed4e
commit e743b36cfc
2 changed files with 95 additions and 2 deletions
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25
clutter/clutter/clutter-frame-clock.c
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@ -72,6 +72,9 @@ struct _ClutterFrameClock
ClutterFrameClockState state;
int64_t last_presentation_time_us;
gboolean is_next_presentation_time_valid;
int64_t next_presentation_time_us;
gboolean pending_reschedule;
};
@ -120,7 +123,8 @@ clutter_frame_clock_notify_presented (ClutterFrameClock *frame_clock,
static void
calculate_next_update_time_us (ClutterFrameClock *frame_clock,
int64_t *out_next_update_time_us)
int64_t *out_next_update_time_us,
int64_t *out_next_presentation_time_us)
{
int64_t last_presentation_time_us;
int64_t now_us;
@ -128,6 +132,8 @@ calculate_next_update_time_us (ClutterFrameClock *frame_clock,
int64_t refresh_interval_us;
int64_t min_render_time_allowed_us;
int64_t max_render_time_allowed_us;
int64_t last_next_presentation_time_us;
int64_t time_since_last_next_presentation_time_us;
int64_t next_presentation_time_us;
int64_t next_update_time_us;
@ -159,12 +165,24 @@ calculate_next_update_time_us (ClutterFrameClock *frame_clock,
next_presentation_time_us = logical_clock_phase_us + hw_clock_offset_us;
}
/* Skip one interval if we got an early presented event. */
last_next_presentation_time_us = frame_clock->next_presentation_time_us;
time_since_last_next_presentation_time_us =
next_presentation_time_us - last_next_presentation_time_us;
if (frame_clock->is_next_presentation_time_valid &&
time_since_last_next_presentation_time_us < (refresh_interval_us / 2))
{
next_presentation_time_us =
frame_clock->next_presentation_time_us + refresh_interval_us;
}
while (next_presentation_time_us < now_us + min_render_time_allowed_us)
next_presentation_time_us += refresh_interval_us;
next_update_time_us = next_presentation_time_us - max_render_time_allowed_us;
*out_next_update_time_us = next_update_time_us;
*out_next_presentation_time_us = next_presentation_time_us;
}
void
@ -178,7 +196,10 @@ clutter_frame_clock_schedule_update (ClutterFrameClock *frame_clock)
next_update_time_us = g_get_monotonic_time ();
break;
case CLUTTER_FRAME_CLOCK_STATE_IDLE:
calculate_next_update_time_us (frame_clock, &next_update_time_us);
calculate_next_update_time_us (frame_clock,
&next_update_time_us,
&frame_clock->next_presentation_time_us);
frame_clock->is_next_presentation_time_valid = TRUE;
break;
case CLUTTER_FRAME_CLOCK_STATE_SCHEDULED:
return;