Implement basic .chart drums loading

Assets/Script/Chart/Loaders/FiveLaneDrumsChartLoader.cs

@@ -0,0 +1,55 @@
+using System.Collections.Generic;
+using MoonscraperChartEditor.Song;
+using YARG.Data;
+
+namespace YARG.Chart {
+	public class FiveLaneDrumsChartLoader : IChartLoader<NoteInfo> {
+		public List<NoteInfo> GetNotesFromChart(MoonSong song, Difficulty difficulty) {
+			var notes = new List<NoteInfo>();
+			bool doubleBass = false;
+			if (difficulty == Difficulty.EXPERT_PLUS) {
+				difficulty = Difficulty.EXPERT;
+				doubleBass = true;
+			}
+			var chart = song.GetChart(MoonSong.MoonInstrument.Drums, MoonSong.Difficulty.Easy - (int) difficulty);
+
+			foreach (var moonNote in chart.notes) {
+				// Ignore double-kicks if not Expert+
+				if (!doubleBass && (moonNote.flags & MoonNote.Flags.DoubleKick) != 0)
+					continue;
+
+				// Convert note value
+				int pad = MoonDrumNoteToPad(moonNote);
+				if (pad == -1)
+					continue;
+
+				// Length of the note in realtime
+				double timeLength = song.TickToTime(moonNote.tick + moonNote.length, song.resolution) - moonNote.time;
+
+				var note = new NoteInfo {
+					time = (float) moonNote.time,
+					length = (float) timeLength,
+					fret = pad,
+					hopo = moonNote.type == MoonNote.MoonNoteType.Cymbal
+				};
+
+				notes.Add(note);
+			}
+
+			// TODO: Need to handle playing 4-lane charts on 5-lane
+			return notes;
+		}
+
+		private int MoonDrumNoteToPad(MoonNote note) {
+			return note.drumPad switch {
+				MoonNote.DrumPad.Kick   => 5,
+				MoonNote.DrumPad.Red    => 0,
+				MoonNote.DrumPad.Yellow => 1,
+				MoonNote.DrumPad.Blue   => 2,
+				MoonNote.DrumPad.Orange => 3,
+				MoonNote.DrumPad.Green  => 4,
+				_                       => -1
+			};
+		}
+	}
+}

Assets/Script/Chart/Loaders/FourLaneDrumsChartLoader.cs

@@ -0,0 +1,61 @@
+using System.Collections.Generic;
+using MoonscraperChartEditor.Song;
+using YARG.Data;
+
+namespace YARG.Chart {
+	public class FourLaneDrumsChartLoader : IChartLoader<NoteInfo> {
+		private bool _proDrums;
+
+		public FourLaneDrumsChartLoader(bool pro) {
+			_proDrums = pro;
+		}
+
+		public List<NoteInfo> GetNotesFromChart(MoonSong song, Difficulty difficulty) {
+			var notes = new List<NoteInfo>();
+			bool doubleBass = false;
+			if (difficulty == Difficulty.EXPERT_PLUS) {
+				difficulty = Difficulty.EXPERT;
+				doubleBass = true;
+			}
+			var chart = song.GetChart(MoonSong.MoonInstrument.Drums, MoonSong.Difficulty.Easy - (int) difficulty);
+
+			foreach (var moonNote in chart.notes) {
+				// Ignore double-kicks if not Expert+
+				if (!doubleBass && (moonNote.flags & MoonNote.Flags.DoubleKick) != 0)
+					continue;
+
+				// Convert note value
+				int pad = MoonDrumNoteToPad(moonNote);
+				if (pad == -1)
+					continue;
+
+				// Length of the note in realtime
+				double timeLength = song.TickToTime(moonNote.tick + moonNote.length, song.resolution) - moonNote.time;
+
+				var note = new NoteInfo {
+					time = (float) moonNote.time,
+					length = (float) timeLength,
+					fret = pad,
+					hopo = _proDrums && moonNote.type == MoonNote.MoonNoteType.Cymbal
+				};
+
+				notes.Add(note);
+			}
+
+			// TODO: Need to handle playing 5-lane charts on 4-lane
+			return notes;
+		}
+
+		private int MoonDrumNoteToPad(MoonNote note) {
+			return note.drumPad switch {
+				MoonNote.DrumPad.Kick   => 4,
+				MoonNote.DrumPad.Red    => 0,
+				MoonNote.DrumPad.Yellow => 1,
+				MoonNote.DrumPad.Blue   => 2,
+				MoonNote.DrumPad.Orange => 3, // Moonscraper internally uses Orange for 4-lane green
+				MoonNote.DrumPad.Green  => 3, // Turn 5-lane green into 4-lane green
+				_                       => -1
+			};
+		}
+	}
+}

Assets/Script/Chart/Loaders/GuitarChartLoader.cs

@@ -4,8 +4,12 @@
 
 namespace YARG.Chart {
 	public class GuitarChartLoader : IChartLoader<NoteInfo> {
-		public List<NoteInfo> GetNotesFromChart(MoonSong song, MoonChart chart) {
+		public List<NoteInfo> GetNotesFromChart(MoonSong song, Difficulty difficulty) {
 			var notes = new List<NoteInfo>();
+			if (difficulty == Difficulty.EXPERT_PLUS) {
+				difficulty = Difficulty.EXPERT;
+			}
+			var chart = song.GetChart(MoonSong.MoonInstrument.Guitar, MoonSong.Difficulty.Easy - (int) difficulty);
 
 			foreach (var moonNote in chart.notes) {
 				// Length of the note in realtime

Assets/Script/Chart/Loaders/IChartLoader.cs

@@ -1,10 +1,11 @@
 using System.Collections.Generic;
 using MoonscraperChartEditor.Song;
+using YARG.Data;
 
 namespace YARG.Chart {
 	public interface IChartLoader<T> {
 
-		public List<T> GetNotesFromChart(MoonSong song, MoonChart chart);
+		public List<T> GetNotesFromChart(MoonSong song, Difficulty chart);
 
 	}
 }

Assets/Script/Chart/Loaders/New/NewDrumChartLoader.cs

@@ -1,19 +1,24 @@
 using System.Collections.Generic;
 using MoonscraperChartEditor.Song;
+using YARG.Data;
 
 namespace YARG.Chart {
 	public class NewDrumChartLoader : IChartLoader<DrumNote> {
 
 		private readonly bool _isPro;
-		private readonly bool _isDoubleBass;
 
-		public NewDrumChartLoader(bool isPro, bool doubleBass) {
+		public NewDrumChartLoader(bool isPro) {
 			_isPro = isPro;
-			_isDoubleBass = doubleBass;
 		}
 
-		public List<DrumNote> GetNotesFromChart(MoonSong song, MoonChart chart) {
+		public List<DrumNote> GetNotesFromChart(MoonSong song, Difficulty difficulty) {
 			var notes = new List<DrumNote>();
+			bool doubleBass = false;
+			if (difficulty == Difficulty.EXPERT_PLUS) {
+				difficulty = Difficulty.EXPERT;
+				doubleBass = true;
+			}
+			var chart = song.GetChart(MoonSong.MoonInstrument.Drums, MoonSong.Difficulty.Easy - (int) difficulty);
 
 			// do star power later lol idk how it works
 
@@ -34,7 +39,7 @@ public List<DrumNote> GetNotesFromChart(MoonSong song, MoonChart chart) {
 				// Is kick, is double kick note but double bass not active
 				// Skip the note
 				if (moonNote.drumPad == MoonNote.DrumPad.Kick && (moonNote.flags & MoonNote.Flags.DoubleKick) != 0 &&
-				    !_isDoubleBass) {
+				    !doubleBass) {
 					continue;
 				}
 

Assets/Script/Chart/Loaders/New/NewGuitarChartLoader.cs

@@ -1,11 +1,16 @@
 using System.Collections.Generic;
 using MoonscraperChartEditor.Song;
+using YARG.Data;
 
 namespace YARG.Chart {
 	public class NewGuitarChartLoader : IChartLoader<GuitarNote> {
 
-		public List<GuitarNote> GetNotesFromChart(MoonSong song, MoonChart chart) {
+		public List<GuitarNote> GetNotesFromChart(MoonSong song, Difficulty difficulty) {
 			var notes = new List<GuitarNote>();
+			if (difficulty == Difficulty.EXPERT_PLUS) {
+				difficulty = Difficulty.EXPERT;
+			}
+			var chart = song.GetChart(MoonSong.MoonInstrument.Guitar, MoonSong.Difficulty.Easy - (int) difficulty);
 
 			var starpowers = chart.starPower.ToArray();
 

Assets/Script/Data/YargChart.cs

@@ -47,18 +47,19 @@ public List<NoteInfo>[] Keys {
 
 		private List<NoteInfo>[] drums;
 		public List<NoteInfo>[] Drums {
-			get => drums;// ?? LoadArray(new DrumsChartLoader(false), MoonSong.MoonInstrument.Drums, 4);
+			get => drums ?? LoadArray(ref drums, new FourLaneDrumsChartLoader(pro: false), MoonSong.MoonInstrument.Drums, Difficulty.EXPERT_PLUS);
 			set => drums = value;
 		}
+
 		private List<NoteInfo>[] realDrums;
 		public List<NoteInfo>[] RealDrums {
-			get => realDrums;// ?? LoadArray(new DrumsChartLoader(true), MoonSong.MoonInstrument.Drums, 4);
+			get => realDrums ?? LoadArray(ref realDrums, new FourLaneDrumsChartLoader(pro: true), MoonSong.MoonInstrument.Drums, Difficulty.EXPERT_PLUS, isPro: true);
 			set => realDrums = value;
 		}
-		
+
 		private List<NoteInfo>[] ghDrums;
 		public List<NoteInfo>[] GhDrums {
-			get => ghDrums;// ?? LoadArray(new DrumsChartLoader(false), MoonSong.MoonInstrument.Drums, 4);
+			get => ghDrums ?? LoadArray(ref ghDrums, new FiveLaneDrumsChartLoader(), MoonSong.MoonInstrument.Drums, Difficulty.EXPERT_PLUS, isGh: true);
 			set => ghDrums = value;
 		}
 
@@ -121,11 +122,11 @@ public void InitializeArrays() {
 			};
 		}
 
-		private List<NoteInfo>[] LoadArray(ref List<NoteInfo>[] notes, IChartLoader<NoteInfo> loader, MoonSong.MoonInstrument instrument, int length = 4,
-			bool isPro = false, bool isGh = false) {
-			notes = new List<NoteInfo>[length];
-			for (int i = 0; i < length; i++) {
-				notes[i] = loader.GetNotesFromChart(_song, _song.GetChart(instrument, (MoonSong.Difficulty) length - 1 - i));
+		private List<NoteInfo>[] LoadArray(ref List<NoteInfo>[] notes, IChartLoader<NoteInfo> loader, MoonSong.MoonInstrument instrument,
+			Difficulty maxDifficulty = Difficulty.EXPERT, bool isPro = false, bool isGh = false) {
+			notes = new List<NoteInfo>[(int) (maxDifficulty + 1)];
+			for (Difficulty diff = Difficulty.EASY; diff <= maxDifficulty; diff++) {
+				notes[(int) diff] = loader.GetNotesFromChart(_song, diff);
 			}
 
 			if (_loadedEvents.Contains(instrument)) {