Added a "Adjust pitch" switch

Adjust pitch switch in DoubleTime and HalfTime mods
Also Nightcore and Daycore is now inherit from RateAdjust

osu.Game/Rulesets/Mods/ModDaycore.cs

@@ -5,16 +5,26 @@ using osu.Framework.Audio;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Localisation;
+using osu.Game.Configuration;
 
 namespace osu.Game.Rulesets.Mods
 {
-    public abstract class ModDaycore : ModHalfTime
+    public abstract class ModDaycore : ModRateAdjust
     {
         public override string Name => "Daycore";
         public override string Acronym => "DC";
         public override IconUsage? Icon => null;
+        public override ModType Type => ModType.DifficultyReduction;
         public override LocalisableString Description => "Whoaaaaa...";
 
+        [SettingSource("Speed decrease", "The actual decrease to apply")]
+        public override BindableNumber<double> SpeedChange { get; } = new BindableDouble(0.75)
+        {
+            MinValue = 0.5,
+            MaxValue = 0.99,
+            Precision = 0.01,
+        };
+
         private readonly BindableNumber<double> tempoAdjust = new BindableDouble(1);
         private readonly BindableNumber<double> freqAdjust = new BindableDouble(1);
 
@@ -33,5 +43,19 @@ namespace osu.Game.Rulesets.Mods
             track.AddAdjustment(AdjustableProperty.Frequency, freqAdjust);
             track.AddAdjustment(AdjustableProperty.Tempo, tempoAdjust);
         }
+
+        public override double ScoreMultiplier
+        {
+            get
+            {
+                // Round to the nearest multiple of 0.1.
+                double value = (int)(SpeedChange.Value * 10) / 10.0;
+
+                // Offset back to 0.
+                value -= 1;
+
+                return 1 + value;
+            }
+        }
     }
 }

osu.Game/Rulesets/Mods/ModDoubleTime.cs

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using osu.Framework.Audio;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Localisation;
@@ -25,6 +26,31 @@ namespace osu.Game.Rulesets.Mods
             Precision = 0.01,
         };
 
+        private IAdjustableAudioComponent? track;
+
+        [SettingSource("Adjust pitch", "Should pitch be adjusted with speed")]
+        public virtual BindableBool AdjustPitch { get; } = new BindableBool(false);
+
+        protected ModDoubleTime()
+        {
+            AdjustPitch.BindValueChanged(adjustPitchChanged);
+        }
+
+        private void adjustPitchChanged(ValueChangedEvent<bool> adjustPitchSetting)
+        {
+            track?.RemoveAdjustment(adjustmentForPitchSetting(adjustPitchSetting.OldValue), SpeedChange);
+            track?.AddAdjustment(adjustmentForPitchSetting(adjustPitchSetting.NewValue), SpeedChange);
+        }
+
+        private AdjustableProperty adjustmentForPitchSetting(bool adjustPitchSettingValue)
+            => adjustPitchSettingValue ? AdjustableProperty.Frequency : AdjustableProperty.Tempo;
+
+        public override void ApplyToTrack(IAdjustableAudioComponent track)
+        {
+            this.track = track;
+            AdjustPitch.TriggerChange();
+        }
+
         public override double ScoreMultiplier
         {
             get

osu.Game/Rulesets/Mods/ModHalfTime.cs

@@ -1,6 +1,7 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using osu.Framework.Audio;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Localisation;
@@ -25,6 +26,31 @@ namespace osu.Game.Rulesets.Mods
             Precision = 0.01,
         };
 
+        private IAdjustableAudioComponent? track;
+
+        [SettingSource("Adjust pitch", "Should pitch be adjusted with speed")]
+        public virtual BindableBool AdjustPitch { get; } = new BindableBool(false);
+
+        protected ModHalfTime()
+        {
+            AdjustPitch.BindValueChanged(adjustPitchChanged);
+        }
+
+        private void adjustPitchChanged(ValueChangedEvent<bool> adjustPitchSetting)
+        {
+            track?.RemoveAdjustment(adjustmentForPitchSetting(adjustPitchSetting.OldValue), SpeedChange);
+            track?.AddAdjustment(adjustmentForPitchSetting(adjustPitchSetting.NewValue), SpeedChange);
+        }
+
+        private AdjustableProperty adjustmentForPitchSetting(bool adjustPitchSettingValue)
+            => adjustPitchSettingValue ? AdjustableProperty.Frequency : AdjustableProperty.Tempo;
+
+        public override void ApplyToTrack(IAdjustableAudioComponent track)
+        {
+            this.track = track;
+            AdjustPitch.TriggerChange();
+        }
+
         public override double ScoreMultiplier
         {
             get

osu.Game/Rulesets/Mods/ModNightcore.cs

@@ -11,6 +11,7 @@ using osu.Framework.Localisation;
 using osu.Game.Audio;
 using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Beatmaps.Timing;
+using osu.Game.Configuration;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Containers;
 using osu.Game.Rulesets.Objects;
@@ -19,12 +20,38 @@ using osu.Game.Skinning;
 
 namespace osu.Game.Rulesets.Mods
 {
-    public abstract class ModNightcore : ModDoubleTime
+    public abstract class ModNightcore : ModRateAdjust
     {
         public override string Name => "Nightcore";
         public override string Acronym => "NC";
         public override IconUsage? Icon => OsuIcon.ModNightcore;
+        public override ModType Type => ModType.DifficultyIncrease;
         public override LocalisableString Description => "Uguuuuuuuu...";
+
+        [SettingSource("Speed increase", "The actual increase to apply")]
+        public override BindableNumber<double> SpeedChange { get; } = new BindableDouble(1.5)
+        {
+            MinValue = 1.01,
+            MaxValue = 2,
+            Precision = 0.01,
+        };
+
+        public override double ScoreMultiplier
+        {
+            get
+            {
+                // Round to the nearest multiple of 0.1.
+                double value = (int)(SpeedChange.Value * 10) / 10.0;
+
+                // Offset back to 0.
+                value -= 1;
+
+                // Each 0.1 multiple changes score multiplier by 0.02.
+                value /= 5;
+
+                return 1 + value;
+            }
+        }
     }
 
     public abstract partial class ModNightcore<TObject> : ModNightcore, IApplicableToDrawableRuleset<TObject>

osu.Game/Rulesets/Mods/ModRateAdjust.cs

@@ -13,10 +13,7 @@ namespace osu.Game.Rulesets.Mods
 
         public abstract BindableNumber<double> SpeedChange { get; }
 
-        public virtual void ApplyToTrack(IAdjustableAudioComponent track)
+        public abstract void ApplyToTrack(IAdjustableAudioComponent track);
-        {
-            track.AddAdjustment(AdjustableProperty.Tempo, SpeedChange);
-        }
 
         public virtual void ApplyToSample(IAdjustableAudioComponent sample)
         {