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wayland: Discard stale presentation feedbacks in _present_feedbacks

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Any feedbacks for the same stage view but older frames than the one
being presented are discarded.

Since we now use per-frame lists of feedbacks, there can no longer be
any stale feedbacks where we previously discarded them, so remove that
dead code.

v2:
* Use ClutterFrameInfo::frame_count.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4306>
This commit is contained in:
Michel Dänzer
2025-02-25 18:34:44 +01:00
committed by Michel Dänzer
parent 903f6281f9
commit 1837c1b299
1 changed files with 32 additions and 54 deletions
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86
src/wayland/meta-wayland-presentation-time.c
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@ -116,20 +116,6 @@ meta_wayland_presentation_time_ensure_feedbacks (MetaWaylandPresentationTime *pr
ClutterStageView *stage_view,
int64_t view_frame_counter);
static void
discard_non_cursor_feedbacks (struct wl_list *feedbacks)
{
MetaWaylandPresentationFeedback *feedback, *next;
wl_list_for_each_safe (feedback, next, feedbacks, link)
{
if (META_IS_WAYLAND_CURSOR_SURFACE (feedback->surface->role))
continue;
meta_wayland_presentation_feedback_discard (feedback);
}
}
static void
on_after_paint (ClutterStage *stage,
ClutterStageView *stage_view,
@ -139,20 +125,9 @@ on_after_paint (ClutterStage *stage,
struct wl_list *feedbacks;
GList *l;
/*
* We just painted this stage view, which means that all non-cursor feedbacks
* that didn't fire (e.g. due to page flip failing) are now obsolete and
* should be discarded.
*
* Cursor feedbacks have a similar mechanism done separately, mainly because
* they are painted earlier, in prepare_frame(). This means that the feedbacks
* list currently contains stale non-cursor feedbacks and up-to-date cursor
* feedbacks.
*/
feedbacks =
meta_wayland_presentation_time_ensure_feedbacks (&compositor->presentation_time,
stage_view, frame->frame_count);
discard_non_cursor_feedbacks (feedbacks);
l = compositor->presentation_time.feedback_surfaces;
while (l)
@ -453,27 +428,39 @@ meta_wayland_presentation_time_present_feedbacks (MetaWaylandCompositor *composi
ClutterStageView *stage_view,
ClutterFrameInfo *frame_info)
{
MetaWaylandPresentationFeedback *feedback, *next;
struct wl_list *feedbacks;
MetaWaylandOutput *output;
GHashTable *hash_table;
GHashTableIter iter;
int64_t *key;
hash_table = g_hash_table_lookup (compositor->presentation_time.feedbacks,
stage_view);
if (!hash_table)
return;
feedbacks = g_hash_table_lookup (hash_table, &frame_info->view_frame_counter);
if (!feedbacks)
return;
output = get_output_for_stage_view (compositor, stage_view);
wl_list_for_each_safe (feedback, next, feedbacks, link)
g_hash_table_iter_init (&iter, hash_table);
while (g_hash_table_iter_next (&iter, (gpointer *) &key, (gpointer *)&feedbacks))
{
meta_wayland_presentation_feedback_present (feedback,
frame_info,
output);
MetaWaylandPresentationFeedback *feedback, *next;
if (*key > frame_info->view_frame_counter)
continue;
if (*key == frame_info->view_frame_counter)
{
MetaWaylandOutput *output;
output = get_output_for_stage_view (compositor, stage_view);
wl_list_for_each_safe (feedback, next, feedbacks, link)
{
meta_wayland_presentation_feedback_present (feedback,
frame_info,
output);
}
}
/* This discards feedbacks for older frames which were never presented */
g_hash_table_iter_remove (&iter);
}
g_hash_table_remove (hash_table, &frame_info->view_frame_counter);
@ -485,28 +472,19 @@ meta_wayland_presentation_time_cursor_painted (MetaWaylandPresentationTime *pres
int64_t view_frame_counter,
MetaWaylandCursorSurface *cursor_surface)
{
struct wl_list *feedbacks;
MetaWaylandPresentationFeedback *feedback, *next;
MetaWaylandSurfaceRole *role = META_WAYLAND_SURFACE_ROLE (cursor_surface);
MetaWaylandSurface *surface = meta_wayland_surface_role_get_surface (role);
struct wl_list *feedbacks;
if (wl_list_empty (&surface->presentation_time.feedback_list))
return;
/* Add new feedbacks. */
feedbacks =
meta_wayland_presentation_time_ensure_feedbacks (presentation_time,
stage_view,
view_frame_counter);
/* Discard previous feedbacks for this cursor as now it has gone stale. */
wl_list_for_each_safe (feedback, next, feedbacks, link)
{
if (feedback->surface->role == role)
meta_wayland_presentation_feedback_discard (feedback);
}
/* Add new feedbacks. */
if (!wl_list_empty (&surface->presentation_time.feedback_list))
{
wl_list_insert_list (feedbacks,
&surface->presentation_time.feedback_list);
wl_list_init (&surface->presentation_time.feedback_list);
}
wl_list_insert_list (feedbacks,
&surface->presentation_time.feedback_list);
wl_list_init (&surface->presentation_time.feedback_list);
}