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Reduce number of redundant control points displayed on summary timeline

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As pointed out in https://github.com/ppy/osu/discussions/16435, beatmaps
with too many control points (usually added via external automation
apps) could cause the lazer editor to grind to a halt.

The overheads here are mostly from the GL side. An eventual goal would
be to render this in a smarter way, rather than using thousands of
drawables. Until that, this optimisation should help reduce the overhead
by omitting control points in close proximity that are redundant for
display purposes.

I've tried to contain this in the display logic directly, with the goal
that it can be ripped out as fast as it was added. Certainly required
more changes than I hoped for, but I don't think it's too ugly.
This commit is contained in:
Dean Herbert
2022-01-14 16:29:26 +09:00
parent 70f56cd0c9
commit c64a919a9d
5 changed files with 52 additions and 8 deletions
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24
osu.Game/Screens/Edit/Components/Timelines/Summary/Parts/ControlPointPart.cs
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@ -31,7 +31,16 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
case NotifyCollectionChangedAction.Add:
foreach (var group in args.NewItems.OfType<ControlPointGroup>())
{
// as an optimisation, don't add a visualisation if there are already groups with the same types in close proximity.
// for newly added control points (ie. lazer editor first where group is added empty) we always skip for simplicity.
// that is fine, because cases where this is causing a performance issue are mostly where external tools were used to create an insane number of points.
// if (Children.Any(g => Math.Abs(g.Group.Time - group.Time) < 1000 && g.IsRedundant(group)))
// continue;
Add(new GroupVisualisation(group));
}
break;
case NotifyCollectionChangedAction.Remove:
@ -39,7 +48,20 @@ namespace osu.Game.Screens.Edit.Components.Timelines.Summary.Parts
{
var matching = Children.SingleOrDefault(gv => gv.Group == group);
matching?.Expire();
if (matching != null)
matching.Expire();
else
{
// due to the add optimisation above, if a point is deleted which wasn't being displayed we need to recreate all points
// to guarantee an accurate representation.
//
// note that the case where control point (type) is added or removed from a non-displayed group is not handled correctly.
// this is an edge case which shouldn't affect the user too badly. we may flatted control point groups in the future
// which would allow this to be handled better.
Clear();
foreach (var g in controlPointGroups)
Add(new GroupVisualisation(g));
}
}
break;