From fec744a7fe5b4d44fdcd801ef63ad14d63ee334f Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Fri, 26 Aug 2022 17:44:33 +0900
Subject: [PATCH] Add global `FramedBeatmapClock` for `BeatSyncProvider`
 components

---
 osu.Game/OsuGameBase.cs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/osu.Game/OsuGameBase.cs b/osu.Game/OsuGameBase.cs
index 8d5c58d5f0..27ea3a76ae 100644
--- a/osu.Game/OsuGameBase.cs
+++ b/osu.Game/OsuGameBase.cs
@@ -185,6 +185,12 @@ namespace osu.Game
 
         private RealmAccess realm;
 
+        /// <summary>
+        /// For now, this is used as a source specifically for beat synced components.
+        /// Going forward, it could potentially be used as the single source-of-truth for beatmap timing.
+        /// </summary>
+        private readonly FramedBeatmapClock beatmapClock = new FramedBeatmapClock(true);
+
         protected override Container<Drawable> Content => content;
 
         private Container content;
@@ -368,10 +374,15 @@ namespace osu.Game
             AddInternal(MusicController = new MusicController());
             dependencies.CacheAs(MusicController);
 
+            MusicController.TrackChanged += onTrackChanged;
+            AddInternal(beatmapClock);
+
             Ruleset.BindValueChanged(onRulesetChanged);
             Beatmap.BindValueChanged(onBeatmapChanged);
         }
 
+        private void onTrackChanged(WorkingBeatmap beatmap, TrackChangeDirection direction) => beatmapClock.ChangeSource(beatmap.Track);
+
         protected virtual void InitialiseFonts()
         {
             AddFont(Resources, @"Fonts/osuFont");
@@ -587,7 +598,7 @@ namespace osu.Game
         }
 
         ControlPointInfo IBeatSyncProvider.ControlPoints => Beatmap.Value.BeatmapLoaded ? Beatmap.Value.Beatmap.ControlPointInfo : null;
-        IClock IBeatSyncProvider.Clock => Beatmap.Value.TrackLoaded ? Beatmap.Value.Track : (IClock)null;
+        IClock IBeatSyncProvider.Clock => beatmapClock;
         ChannelAmplitudes IHasAmplitudes.CurrentAmplitudes => Beatmap.Value.TrackLoaded ? Beatmap.Value.Track.CurrentAmplitudes : ChannelAmplitudes.Empty;
     }
 }