Allow screen to specify whether to apply audio rate adjustments from mods

osu.Game/OsuGame.cs

@@ -925,6 +925,8 @@ namespace osu.Game
             {
                 OverlayActivationMode.Value = newOsuScreen.InitialOverlayActivationMode;
 
+                musicController.AllowRateAdjustments = newOsuScreen.AllowRateAdjustments;
+
                 if (newOsuScreen.HideOverlaysOnEnter)
                     CloseAllOverlays();
                 else

osu.Game/Overlays/MusicController.cs

@@ -47,7 +47,7 @@ namespace osu.Game.Overlays
         private OnScreenDisplay onScreenDisplay { get; set; }
 
         [BackgroundDependencyLoader]
-        private void load()
+        private void load(OsuGame game)
         {
             beatmapSets.AddRange(beatmaps.GetAllUsableBeatmapSets().OrderBy(_ => RNG.Next()));
             beatmaps.ItemAdded += handleBeatmapAdded;
@@ -233,6 +233,24 @@ namespace osu.Game.Overlays
             queuedDirection = null;
         }
 
+        private bool allowRateAdjustments;
+
+        /// <summary>
+        /// Whether mod rate adjustments are allowed to be applied.
+        /// </summary>
+        public bool AllowRateAdjustments
+        {
+            get => allowRateAdjustments;
+            set
+            {
+                if (allowRateAdjustments == value)
+                    return;
+
+                allowRateAdjustments = value;
+                ResetTrackAdjustments();
+            }
+        }
+
         public void ResetTrackAdjustments()
         {
             var track = current?.Track;
@@ -241,8 +259,11 @@ namespace osu.Game.Overlays
 
             track.ResetSpeedAdjustments();
 
-            foreach (var mod in mods.Value.OfType<IApplicableToClock>())
+            if (allowRateAdjustments)
-                mod.ApplyToClock(track);
+            {
+                foreach (var mod in mods.Value.OfType<IApplicableToClock>())
+                    mod.ApplyToClock(track);
+            }
         }
 
         protected override void Dispose(bool isDisposing)

osu.Game/Screens/IOsuScreen.cs

@@ -51,5 +51,10 @@ namespace osu.Game.Screens
         Bindable<WorkingBeatmap> Beatmap { get; }
 
         Bindable<RulesetInfo> Ruleset { get; }
+
+        /// <summary>
+        /// Whether mod rate adjustments are allowed to be applied.
+        /// </summary>
+        bool AllowRateAdjustments { get; }
     }
 }

osu.Game/Screens/Menu/MainMenu.cs

@@ -37,6 +37,8 @@ namespace osu.Game.Screens.Menu
 
         public override bool AllowExternalScreenChange => true;
 
+        public override bool AllowRateAdjustments => false;
+
         private Screen songSelect;
 
         private MenuSideFlashes sideFlashes;

osu.Game/Screens/OsuScreen.cs

@@ -91,6 +91,8 @@ namespace osu.Game.Screens
 
         public Bindable<RulesetInfo> Ruleset { get; private set; }
 
+        public virtual bool AllowRateAdjustments => true;
+
         public Bindable<IReadOnlyList<Mod>> Mods { get; private set; }
 
         protected override IReadOnlyDependencyContainer CreateChildDependencies(IReadOnlyDependencyContainer parent)

osu.Game/Screens/StartupScreen.cs

@@ -16,6 +16,8 @@ namespace osu.Game.Screens
 
         public override bool CursorVisible => false;
 
+        public override bool AllowRateAdjustments => false;
+
         public override OverlayActivation InitialOverlayActivationMode => OverlayActivation.Disabled;
     }
 }