Merge pull request #467 from smoogipooo/beatmap_conversion

Beatmap conversion

osu.Game.Modes.Catch/Beatmaps/CatchBeatmapConverter.cs

@@ -0,0 +1,21 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+
+using osu.Game.Beatmaps;
+using osu.Game.Modes.Catch.Objects;
+using System.Collections.Generic;
+
+namespace osu.Game.Modes.Catch.Beatmaps
+{
+    internal class CatchBeatmapConverter : IBeatmapConverter<CatchBaseHit>
+    {
+        public Beatmap<CatchBaseHit> Convert(Beatmap original)
+        {
+            return new Beatmap<CatchBaseHit>(original)
+            {
+                HitObjects = new List<CatchBaseHit>() // Todo: Convert HitObjects
+            };
+        }
+    }
+}

osu.Game.Modes.Catch/CatchDifficultyCalculator.cs

@@ -2,26 +2,23 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Game.Beatmaps;
+using osu.Game.Modes.Catch.Beatmaps;
 using osu.Game.Modes.Catch.Objects;
-using osu.Game.Modes.Objects;
-using System;
 using System.Collections.Generic;
 
 namespace osu.Game.Modes.Catch
 {
     public class CatchDifficultyCalculator : DifficultyCalculator<CatchBaseHit>
     {
-        protected override PlayMode PlayMode => PlayMode.Catch;
-
         public CatchDifficultyCalculator(Beatmap beatmap) : base(beatmap)
         {
         }
 
-        protected override HitObjectConverter<CatchBaseHit> Converter => new CatchConverter();
+        protected override double CalculateInternal(Dictionary<string, string> categoryDifficulty)
-
-        protected override double CalculateInternal(Dictionary<String, String> categoryDifficulty)
         {
             return 0;
         }
+
+        protected override IBeatmapConverter<CatchBaseHit> CreateBeatmapConverter() => new CatchBeatmapConverter();
     }
 }

osu.Game.Modes.Catch/UI/CatchHitRenderer.cs

@@ -2,8 +2,8 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Game.Beatmaps;
+using osu.Game.Modes.Catch.Beatmaps;
 using osu.Game.Modes.Catch.Objects;
-using osu.Game.Modes.Objects;
 using osu.Game.Modes.Objects.Drawables;
 using osu.Game.Modes.UI;
 
@@ -16,7 +16,7 @@ namespace osu.Game.Modes.Catch.UI
         {
         }
 
-        protected override HitObjectConverter<CatchBaseHit> Converter => new CatchConverter();
+        protected override IBeatmapConverter<CatchBaseHit> CreateBeatmapConverter() => new CatchBeatmapConverter();
 
         protected override Playfield<CatchBaseHit> CreatePlayfield() => new CatchPlayfield();
 

osu.Game.Modes.Catch/osu.Game.Modes.Catch.csproj

@@ -47,6 +47,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Beatmaps\CatchBeatmapConverter.cs" />
     <Compile Include="CatchDifficultyCalculator.cs" />
     <Compile Include="Objects\CatchBaseHit.cs" />
     <Compile Include="Objects\CatchConverter.cs" />

osu.Game.Modes.Mania/Beatmaps/ManiaBeatmapConverter.cs

@@ -0,0 +1,21 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+
+using osu.Game.Beatmaps;
+using osu.Game.Modes.Mania.Objects;
+using System.Collections.Generic;
+
+namespace osu.Game.Modes.Mania.Beatmaps
+{
+    internal class ManiaBeatmapConverter : IBeatmapConverter<ManiaBaseHit>
+    {
+        public Beatmap<ManiaBaseHit> Convert(Beatmap original)
+        {
+            return new Beatmap<ManiaBaseHit>(original)
+            {
+                HitObjects = new List<ManiaBaseHit>() // Todo: Implement
+            };
+        }
+    }
+}

osu.Game.Modes.Mania/ManiaDifficultyCalculator.cs

@@ -2,29 +2,24 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Game.Beatmaps;
+using osu.Game.Modes.Mania.Beatmaps;
 using osu.Game.Modes.Mania.Objects;
-using osu.Game.Modes.Objects;
-using System;
 using System.Collections.Generic;
 
 namespace osu.Game.Modes.Mania
 {
     public class ManiaDifficultyCalculator : DifficultyCalculator<ManiaBaseHit>
     {
-        protected override PlayMode PlayMode => PlayMode.Mania;
+        public ManiaDifficultyCalculator(Beatmap beatmap)
-
+            : base(beatmap)
-        private int columns;
-
-        public ManiaDifficultyCalculator(Beatmap beatmap, int columns = 5) : base(beatmap)
         {
-            this.columns = columns;
         }
 
-        protected override HitObjectConverter<ManiaBaseHit> Converter => new ManiaConverter(columns);
+        protected override double CalculateInternal(Dictionary<string, string> categoryDifficulty)
-
-        protected override double CalculateInternal(Dictionary<String, String> categoryDifficulty)
         {
             return 0;
         }
+
+        protected override IBeatmapConverter<ManiaBaseHit> CreateBeatmapConverter() => new ManiaBeatmapConverter();
     }
 }

osu.Game.Modes.Mania/UI/ManiaHitRenderer.cs

@@ -2,8 +2,8 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Game.Beatmaps;
+using osu.Game.Modes.Mania.Beatmaps;
 using osu.Game.Modes.Mania.Objects;
-using osu.Game.Modes.Objects;
 using osu.Game.Modes.Objects.Drawables;
 using osu.Game.Modes.UI;
 
@@ -19,7 +19,7 @@ namespace osu.Game.Modes.Mania.UI
             this.columns = columns;
         }
 
-        protected override HitObjectConverter<ManiaBaseHit> Converter => new ManiaConverter(columns);
+        protected override IBeatmapConverter<ManiaBaseHit> CreateBeatmapConverter() => new ManiaBeatmapConverter();
 
         protected override Playfield<ManiaBaseHit> CreatePlayfield() => new ManiaPlayfield(columns);
 

osu.Game.Modes.Mania/osu.Game.Modes.Mania.csproj

@@ -47,6 +47,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Beatmaps\ManiaBeatmapConverter.cs" />
     <Compile Include="ManiaDifficultyCalculator.cs" />
     <Compile Include="Objects\Drawable\DrawableNote.cs" />
     <Compile Include="Objects\HoldNote.cs" />
@@ -85,6 +86,7 @@
     <None Include="OpenTK.dll.config" />
     <None Include="packages.config" />
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

osu.Game.Modes.Osu/Beatmaps/OsuBeatmapConverter.cs

@@ -1,35 +1,45 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System.Collections.Generic;
-using osu.Game.Modes.Objects;
-using osu.Game.Beatmaps;
-using osu.Game.Modes.Osu.Objects.Drawables;
-using OpenTK;
 
-namespace osu.Game.Modes.Osu.Objects
+using OpenTK;
+using osu.Game.Beatmaps;
+using osu.Game.Modes.Objects;
+using osu.Game.Modes.Osu.Objects;
+using osu.Game.Modes.Osu.Objects.Drawables;
+using System.Collections.Generic;
+
+namespace osu.Game.Modes.Osu.Beatmaps
 {
-    public class OsuHitObjectConverter : HitObjectConverter<OsuHitObject>
+    internal class OsuBeatmapConverter : IBeatmapConverter<OsuHitObject>
     {
-        public override List<OsuHitObject> Convert(Beatmap beatmap)
+        public Beatmap<OsuHitObject> Convert(Beatmap original)
         {
-            List<OsuHitObject> output = new List<OsuHitObject>();
+            return new Beatmap<OsuHitObject>(original)
+            {
+                HitObjects = convertHitObject(original.HitObjects, original.BeatmapInfo?.StackLeniency ?? 0.7f)
+            };
+        }
+
+        private List<OsuHitObject> convertHitObject(List<HitObject> hitObjects, float stackLeniency)
+        {
+            List<OsuHitObject> converted = new List<OsuHitObject>();
 
             int combo = 0;
-            foreach (HitObject h in beatmap.HitObjects)
+            foreach (HitObject h in hitObjects)
             {
                 if (h.NewCombo) combo = 0;
 
                 h.ComboIndex = combo++;
-                output.Add(h as OsuHitObject);
+                converted.Add(h as OsuHitObject);
             }
 
-            UpdateStacking(output, beatmap.BeatmapInfo?.StackLeniency ?? 0.7f);
+            updateStacking(converted, stackLeniency);
 
-            return output;
+            return converted;
         }
 
-        public static void UpdateStacking(List<OsuHitObject> hitObjects, float stackLeniency, int startIndex = 0, int endIndex = -1)
+        private void updateStacking(List<OsuHitObject> hitObjects, float stackLeniency, int startIndex = 0, int endIndex = -1)
         {
             if (endIndex == -1)
                 endIndex = hitObjects.Count - 1;
@@ -171,6 +181,5 @@ namespace osu.Game.Modes.Osu.Objects
                 }
             }
         }
-
     }
 }

osu.Game.Modes.Osu/OsuDifficultyCalculator.cs

@@ -2,10 +2,10 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Game.Beatmaps;
+using osu.Game.Modes.Osu.Beatmaps;
 using osu.Game.Modes.Osu.Objects;
 using System;
 using System.Collections.Generic;
-using osu.Game.Modes.Objects;
 
 namespace osu.Game.Modes.Osu
 {
@@ -14,8 +14,6 @@ namespace osu.Game.Modes.Osu
         private const double star_scaling_factor = 0.0675;
         private const double extreme_scaling_factor = 0.5;
 
-        protected override PlayMode PlayMode => PlayMode.Osu;
-
         /// <summary>
         /// HitObjects are stored as a member variable.
         /// </summary>
@@ -25,8 +23,6 @@ namespace osu.Game.Modes.Osu
         {
         }
 
-        protected override HitObjectConverter<OsuHitObject> Converter => new OsuHitObjectConverter();
-
         protected override void PreprocessHitObjects()
         {
             foreach (var h in Objects)
@@ -34,7 +30,7 @@ namespace osu.Game.Modes.Osu
                     ((Slider)h).Curve.Calculate();
         }
 
-        protected override double CalculateInternal(Dictionary<String, String> categoryDifficulty)
+        protected override double CalculateInternal(Dictionary<string, string> categoryDifficulty)
         {
             // Fill our custom DifficultyHitObject class, that carries additional information
             DifficultyHitObjects.Clear();
@@ -184,6 +180,8 @@ namespace osu.Game.Modes.Osu
             return difficulty;
         }
 
+        protected override IBeatmapConverter<OsuHitObject> CreateBeatmapConverter() => new OsuBeatmapConverter();
+
         // Those values are used as array indices. Be careful when changing them!
         public enum DifficultyType
         {

osu.Game.Modes.Osu/UI/OsuHitRenderer.cs

@@ -2,8 +2,8 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Game.Beatmaps;
-using osu.Game.Modes.Objects;
 using osu.Game.Modes.Objects.Drawables;
+using osu.Game.Modes.Osu.Beatmaps;
 using osu.Game.Modes.Osu.Objects;
 using osu.Game.Modes.Osu.Objects.Drawables;
 using osu.Game.Modes.UI;
@@ -17,7 +17,7 @@ namespace osu.Game.Modes.Osu.UI
         {
         }
 
-        protected override HitObjectConverter<OsuHitObject> Converter => new OsuHitObjectConverter();
+        protected override IBeatmapConverter<OsuHitObject> CreateBeatmapConverter() => new OsuBeatmapConverter();
 
         protected override Playfield<OsuHitObject> CreatePlayfield() => new OsuPlayfield();
 

osu.Game.Modes.Osu/osu.Game.Modes.Osu.csproj

@@ -43,6 +43,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Beatmaps\OsuBeatmapConverter.cs" />
     <Compile Include="Objects\BezierApproximator.cs" />
     <Compile Include="Objects\CircularArcApproximator.cs" />
     <Compile Include="Objects\Drawables\DrawableOsuHitObject.cs" />
@@ -80,7 +81,6 @@
     <Compile Include="Objects\HitCircle.cs" />
     <Compile Include="Objects\Drawables\DrawableHitCircle.cs" />
     <Compile Include="Objects\OsuHitObject.cs" />
-    <Compile Include="Objects\OsuHitObjectConverter.cs" />
     <Compile Include="Objects\Slider.cs" />
     <Compile Include="Objects\Spinner.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />

osu.Game.Modes.Taiko/Beatmaps/TaikoBeatmapConverter.cs

@@ -0,0 +1,20 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Beatmaps;
+using osu.Game.Modes.Taiko.Objects;
+using System.Collections.Generic;
+
+namespace osu.Game.Modes.Taiko.Beatmaps
+{
+    internal class TaikoBeatmapConverter : IBeatmapConverter<TaikoBaseHit>
+    {
+        public Beatmap<TaikoBaseHit> Convert(Beatmap original)
+        {
+            return new Beatmap<TaikoBaseHit>(original)
+            {
+                HitObjects = new List<TaikoBaseHit>() // Todo: Implement
+            };
+        }
+    }
+}

osu.Game.Modes.Taiko/TaikoDifficultyCalculator.cs

@@ -2,26 +2,23 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Game.Beatmaps;
-using osu.Game.Modes.Objects;
+using osu.Game.Modes.Taiko.Beatmaps;
 using osu.Game.Modes.Taiko.Objects;
-using System;
 using System.Collections.Generic;
 
 namespace osu.Game.Modes.Taiko
 {
     public class TaikoDifficultyCalculator : DifficultyCalculator<TaikoBaseHit>
     {
-        protected override PlayMode PlayMode => PlayMode.Taiko;
-
         public TaikoDifficultyCalculator(Beatmap beatmap) : base(beatmap)
         {
         }
 
-        protected override HitObjectConverter<TaikoBaseHit> Converter => new TaikoConverter();
+        protected override double CalculateInternal(Dictionary<string, string> categoryDifficulty)
-
-        protected override double CalculateInternal(Dictionary<String, String> categoryDifficulty)
         {
             return 0;
         }
+
+        protected override IBeatmapConverter<TaikoBaseHit> CreateBeatmapConverter() => new TaikoBeatmapConverter();
     }
 }

osu.Game.Modes.Taiko/UI/TaikoHitRenderer.cs

@@ -2,8 +2,8 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Game.Beatmaps;
-using osu.Game.Modes.Objects;
 using osu.Game.Modes.Objects.Drawables;
+using osu.Game.Modes.Taiko.Beatmaps;
 using osu.Game.Modes.Taiko.Objects;
 using osu.Game.Modes.UI;
 
@@ -16,7 +16,7 @@ namespace osu.Game.Modes.Taiko.UI
         {
         }
 
-        protected override HitObjectConverter<TaikoBaseHit> Converter => new TaikoConverter();
+        protected override IBeatmapConverter<TaikoBaseHit> CreateBeatmapConverter() => new TaikoBeatmapConverter();
 
         protected override Playfield<TaikoBaseHit> CreatePlayfield() => new TaikoPlayfield();
 

osu.Game.Modes.Taiko/osu.Game.Modes.Taiko.csproj

@@ -47,6 +47,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Beatmaps\TaikoBeatmapConverter.cs" />
     <Compile Include="TaikoDifficultyCalculator.cs" />
     <Compile Include="Objects\Drawable\DrawableTaikoHit.cs" />
     <Compile Include="Objects\TaikoBaseHit.cs" />

osu.Game/Beatmaps/Beatmap.cs

@@ -1,23 +1,44 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System.Collections.Generic;
-using System.Linq;
 using OpenTK.Graphics;
 using osu.Game.Beatmaps.Timing;
 using osu.Game.Database;
-using osu.Game.Modes.Objects;
 using osu.Game.Modes;
+using osu.Game.Modes.Objects;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace osu.Game.Beatmaps
 {
-    public class Beatmap
+    /// <summary>
+    /// A Beatmap containing converted HitObjects.
+    /// </summary>
+    public class Beatmap<T>
+        where T : HitObject
     {
-        public BeatmapInfo BeatmapInfo { get; set; }
+        public BeatmapInfo BeatmapInfo;
+        public List<ControlPoint> ControlPoints;
+        public List<Color4> ComboColors;
+
         public BeatmapMetadata Metadata => BeatmapInfo?.Metadata ?? BeatmapInfo?.BeatmapSet?.Metadata;
-        public List<HitObject> HitObjects { get; set; }
+
-        public List<ControlPoint> ControlPoints { get; set; }
+        /// <summary>
-        public List<Color4> ComboColors { get; set; }
+        /// The HitObjects this Beatmap contains.
+        /// </summary>
+        public List<T> HitObjects;
+
+        /// <summary>
+        /// Constructs a new beatmap.
+        /// </summary>
+        /// <param name="original">The original beatmap to use the parameters of.</param>
+        public Beatmap(Beatmap original = null)
+        {
+            BeatmapInfo = original?.BeatmapInfo;
+            ControlPoints = original?.ControlPoints;
+            ComboColors = original?.ComboColors;
+        }
+
         public double BPMMaximum => 60000 / (ControlPoints?.Where(c => c.BeatLength != 0).OrderBy(c => c.BeatLength).FirstOrDefault() ?? ControlPoint.Default).BeatLength;
         public double BPMMinimum => 60000 / (ControlPoints?.Where(c => c.BeatLength != 0).OrderByDescending(c => c.BeatLength).FirstOrDefault() ?? ControlPoint.Default).BeatLength;
         public double BPMMode => BPMAt(ControlPoints.Where(c => c.BeatLength != 0).GroupBy(c => c.BeatLength).OrderByDescending(grp => grp.Count()).First().First().Time);
@@ -58,7 +79,17 @@ namespace osu.Game.Beatmaps
 
             return timingPoint ?? ControlPoint.Default;
         }
+    }
 
+    /// <summary>
+    /// A Beatmap containing un-converted HitObjects.
+    /// </summary>
+    public class Beatmap : Beatmap<HitObject>
+    {
+        /// <summary>
+        /// Calculates the star difficulty for this Beatmap.
+        /// </summary>
+        /// <returns>The star difficulty.</returns>
         public double CalculateStarDifficulty() => Ruleset.GetRuleset(BeatmapInfo.Mode).CreateDifficultyCalculator(this).Calculate();
     }
 }

osu.Game/Beatmaps/DifficultyCalculator.cs

@@ -1,20 +1,16 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using osu.Game.Modes;
 using osu.Game.Modes.Objects;
-using System;
 using System.Collections.Generic;
 
 namespace osu.Game.Beatmaps
 {
     public abstract class DifficultyCalculator
     {
-        protected abstract PlayMode PlayMode { get; }
-
         protected double TimeRate = 1;
 
-        protected abstract double CalculateInternal(Dictionary<String, String> categoryDifficulty);
+        protected abstract double CalculateInternal(Dictionary<string, string> categoryDifficulty);
 
         private void loadTiming()
         {
@@ -35,16 +31,16 @@ namespace osu.Game.Beatmaps
     {
         protected List<T> Objects;
 
-        protected abstract HitObjectConverter<T> Converter { get; }
-
         protected DifficultyCalculator(Beatmap beatmap)
         {
-            Objects = Converter.Convert(beatmap);
+            Objects = CreateBeatmapConverter().Convert(beatmap).HitObjects;
             PreprocessHitObjects();
         }
 
         protected virtual void PreprocessHitObjects()
         {
         }
+
+        protected abstract IBeatmapConverter<T> CreateBeatmapConverter();
     }
 }

osu.Game/Beatmaps/IBeatmapCoverter.cs

@@ -0,0 +1,12 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Modes.Objects;
+
+namespace osu.Game.Beatmaps
+{
+    public interface IBeatmapConverter<T> where T : HitObject
+    {
+        Beatmap<T> Convert(Beatmap original);
+    }
+}

osu.Game/Database/BeatmapInfo.cs

@@ -1,12 +1,12 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System;
-using System.Linq;
 using osu.Game.Beatmaps.Samples;
 using osu.Game.Modes;
 using SQLite.Net.Attributes;
 using SQLiteNetExtensions.Attributes;
+using System;
+using System.Linq;
 
 namespace osu.Game.Database
 {

osu.Game/Modes/UI/HitRenderer.cs

@@ -32,16 +32,6 @@ namespace osu.Game.Modes.UI
         /// </summary>
         protected abstract bool AllObjectsJudged { get; }
 
-        /// <summary>
-        /// The beatmap this HitRenderer is initialized with.
-        /// </summary>
-        protected readonly Beatmap Beatmap;
-
-        protected HitRenderer(Beatmap beatmap)
-        {
-            Beatmap = beatmap;
-        }
-
         protected void TriggerOnJudgement(JudgementInfo j)
         {
             OnJudgement?.Invoke(j);
@@ -57,19 +47,18 @@ namespace osu.Game.Modes.UI
         public override Func<Vector2, Vector2> MapPlayfieldToScreenSpace => Playfield.ScaledContent.ToScreenSpace;
         public IEnumerable<DrawableHitObject> DrawableObjects => Playfield.HitObjects.Children;
 
-        protected abstract HitObjectConverter<TObject> Converter { get; }
-        protected virtual List<TObject> Convert(Beatmap beatmap) => Converter.Convert(beatmap);
-
         protected override Container<Drawable> Content => content;
         protected override bool AllObjectsJudged => Playfield.HitObjects.Children.All(h => h.Judgement.Result.HasValue);
 
         protected Playfield<TObject> Playfield;
+        protected Beatmap<TObject> Beatmap;
 
         private Container content;
 
         protected HitRenderer(Beatmap beatmap)
-            : base(beatmap)
         {
+            Beatmap = CreateBeatmapConverter().Convert(beatmap);
+
             RelativeSizeAxes = Axes.Both;
 
             InputManager.Add(content = new Container
@@ -93,7 +82,7 @@ namespace osu.Game.Modes.UI
 
         private void loadObjects()
         {
-            foreach (TObject h in Convert(Beatmap))
+            foreach (TObject h in Beatmap.HitObjects)
             {
                 DrawableHitObject<TObject> drawableObject = GetVisualRepresentation(h);
 
@@ -112,5 +101,6 @@ namespace osu.Game.Modes.UI
 
         protected abstract DrawableHitObject<TObject> GetVisualRepresentation(TObject h);
         protected abstract Playfield<TObject> CreatePlayfield();
+        protected abstract IBeatmapConverter<TObject> CreateBeatmapConverter();
     }
 }

osu.Game/osu.Game.csproj

@@ -73,6 +73,7 @@
   <ItemGroup>
     <Compile Include="Beatmaps\Drawables\BeatmapBackgroundSprite.cs" />
     <Compile Include="Beatmaps\DifficultyCalculator.cs" />
+    <Compile Include="Beatmaps\IBeatmapCoverter.cs" />
     <Compile Include="Database\ScoreDatabase.cs" />
     <Compile Include="Graphics\Backgrounds\Triangles.cs" />
     <Compile Include="Graphics\Cursor\CursorTrail.cs" />