Add osu!taiko mod Quarterize

osu.Game.Rulesets.Taiko.Tests/Mods/TestSceneTaikoModQuarterize.cs

@@ -0,0 +1,133 @@
+// Copyright (c) ppy Pty Ltd <[email protected]>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Replays;
+using osu.Game.Rulesets.Taiko.Mods;
+using osu.Game.Rulesets.Taiko.Objects;
+using osu.Game.Rulesets.Taiko.Replays;
+
+namespace osu.Game.Rulesets.Taiko.Tests.Mods
+{
+    public partial class TestSceneTaikoModQuarterize : TaikoModTestScene
+    {
+        [Test]
+        public void TestOneThirdConversion()
+        {
+            CreateModTest(new ModTestData
+            {
+                Mod = new TaikoModQuarterize
+                {
+                    OneThirdConversion = { Value = true },
+                },
+                Autoplay = false,
+                CreateBeatmap = () => new Beatmap
+                {
+                    HitObjects = new List<HitObject>
+                    {
+                        new Hit { StartTime = 1000, Type = HitType.Centre },
+                        new Hit { StartTime = 1500, Type = HitType.Centre },
+                        new Hit { StartTime = 2000, Type = HitType.Centre },
+                        new Hit { StartTime = 2333, Type = HitType.Rim }, // mod removes this
+                        new Hit { StartTime = 2666, Type = HitType.Centre }, // mod moves this to 2500
+                        new Hit { StartTime = 3000, Type = HitType.Centre },
+                        new Hit { StartTime = 3500, Type = HitType.Centre },
+                    },
+                },
+                ReplayFrames = new List<ReplayFrame>
+                {
+                    new TaikoReplayFrame(1000, TaikoAction.LeftCentre),
+                    new TaikoReplayFrame(1200),
+                    new TaikoReplayFrame(1500, TaikoAction.LeftCentre),
+                    new TaikoReplayFrame(1700),
+                    new TaikoReplayFrame(2000, TaikoAction.LeftCentre),
+                    new TaikoReplayFrame(2200),
+                    new TaikoReplayFrame(2500, TaikoAction.LeftCentre),
+                    new TaikoReplayFrame(2700),
+                    new TaikoReplayFrame(3000, TaikoAction.LeftCentre),
+                    new TaikoReplayFrame(3200),
+                    new TaikoReplayFrame(3500, TaikoAction.LeftCentre),
+                    new TaikoReplayFrame(3700),
+                },
+                PassCondition = () => Player.ScoreProcessor.Combo.Value == 6
+            });
+        }
+
+        [Test]
+        public void TestOneSixthConversion() => CreateModTest(new ModTestData
+        {
+            Mod = new TaikoModQuarterize
+            {
+                OneSixthConversion = { Value = true }
+            },
+            Autoplay = false,
+            CreateBeatmap = () => new Beatmap
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Hit { StartTime = 1000, Type = HitType.Centre },
+                    new Hit { StartTime = 1250, Type = HitType.Centre },
+                    new Hit { StartTime = 1500, Type = HitType.Centre },
+                    new Hit { StartTime = 1666, Type = HitType.Rim }, // mod removes this
+                    new Hit { StartTime = 1833, Type = HitType.Centre }, // mod moves this to 1750
+                    new Hit { StartTime = 2000, Type = HitType.Centre },
+                    new Hit { StartTime = 2250, Type = HitType.Centre },
+                },
+            },
+            ReplayFrames = new List<ReplayFrame>
+            {
+                new TaikoReplayFrame(1000, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(1200),
+                new TaikoReplayFrame(1250, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(1450),
+                new TaikoReplayFrame(1500, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(1600),
+                new TaikoReplayFrame(1750, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(1800),
+                new TaikoReplayFrame(2000, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(2200),
+                new TaikoReplayFrame(2250, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(2450),
+            },
+            PassCondition = () => Player.ScoreProcessor.Combo.Value == 6
+        });
+
+        [Test]
+        public void TestOneEighthConversion() => CreateModTest(new ModTestData
+        {
+            Mod = new TaikoModQuarterize
+            {
+                OneEighthConversion = { Value = true }
+            },
+            Autoplay = false,
+            CreateBeatmap = () => new Beatmap
+            {
+                HitObjects = new List<HitObject>
+                {
+                    new Hit { StartTime = 1000, Type = HitType.Centre },
+                    new Hit { StartTime = 1250, Type = HitType.Centre },
+                    new Hit { StartTime = 1500, Type = HitType.Centre },
+                    new Hit { StartTime = 1625, Type = HitType.Rim }, // mod removes this
+                    new Hit { StartTime = 1750, Type = HitType.Centre },
+                    new Hit { StartTime = 2000, Type = HitType.Centre },
+                },
+            },
+            ReplayFrames = new List<ReplayFrame>
+            {
+                new TaikoReplayFrame(1000, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(1200),
+                new TaikoReplayFrame(1250, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(1450),
+                new TaikoReplayFrame(1500, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(1700),
+                new TaikoReplayFrame(1750, TaikoAction.LeftCentre),
+                new TaikoReplayFrame(1900),
+                new TaikoReplayFrame(2000, TaikoAction.LeftCentre),
+            },
+            PassCondition = () => Player.ScoreProcessor.Combo.Value == 5
+        });
+    }
+}

osu.Game.Rulesets.Taiko/Mods/TaikoModQuarterize.cs

@@ -0,0 +1,136 @@
+// Copyright (c) ppy Pty Ltd <[email protected]>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Bindables;
+using osu.Framework.Localisation;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Configuration;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Taiko.Beatmaps;
+using osu.Game.Rulesets.Taiko.Objects;
+
+namespace osu.Game.Rulesets.Taiko.Mods
+{
+    public class TaikoModQuarterize : Mod, IApplicableToBeatmap
+    {
+        public override string Name => "Quarterize";
+        public override string Acronym => "QR";
+        public override double ScoreMultiplier => 0.6;
+        public override LocalisableString Description => "Simplify tricky rhythms!";
+        public override ModType Type => ModType.DifficultyReduction;
+
+        [SettingSource("1/3 to 1/2 conversion", "Converts 1/3 patterns to 1/2 rhythm.")]
+        public Bindable<bool> OneThirdConversion { get; } = new BindableBool(false);
+
+        [SettingSource("1/6 to 1/4 conversion", "Converts 1/6 patterns to 1/4 rhythm.")]
+        public Bindable<bool> OneSixthConversion { get; } = new BindableBool(true);
+
+        [SettingSource("1/8 to 1/4 conversion", "Converts 1/8 patterns to 1/4 rhythm.")]
+        public Bindable<bool> OneEighthConversion { get; } = new BindableBool(false);
+
+        public void ApplyToBeatmap(IBeatmap beatmap)
+        {
+            var taikoBeatmap = (TaikoBeatmap)beatmap;
+            var controlPointInfo = taikoBeatmap.ControlPointInfo;
+            List<Hit> toRemove = new List<Hit>();
+
+            // Snap conversions for rhythms
+            var snapConversions = new Dictionary<int, double>
+            {
+                { 8, 4.0 }, // 1/8 snap to 1/4 snap
+                { 6, 4.0 }, // 1/6 snap to 1/4 snap
+                { 3, 2.0 }, // 1/3 snap to 1/2 snap
+            };
+
+            bool inPattern = false;
+
+            List<Hit> hits = taikoBeatmap.HitObjects.Where(obj => obj is Hit).Cast<Hit>().ToList();
+
+            foreach (var snapConversion in snapConversions)
+            {
+                int patternStartIndex = 0;
+
+                // Skip processing if the corresponding conversion is disabled
+                if (!shouldProcessRhythm(snapConversion.Key))
+                    continue;
+
+                for (int i = 0; i < hits.Count; i++)
+                {
+                    double snapValue = i < hits.Count - 1
+                        ? getSnapBetweenNotes(controlPointInfo, hits[i], hits[i + 1])
+                        : 1; // No next note, default to a safe 1/1 snap
+
+                    if (snapValue == snapConversion.Key)
+                    {
+                        if (!inPattern)
+                        {
+                            patternStartIndex = i;
+                        }
+
+                        inPattern = true;
+                    }
+
+                    // check if end of pattern
+                    if (inPattern && snapValue != snapConversion.Key)
+                    {
+                        // End of the pattern
+                        inPattern = false;
+
+                        // Iterate through the pattern
+                        for (int j = patternStartIndex; j <= i; j++)
+                        {
+                            int currentHitPosition = j - patternStartIndex;
+
+                            if (snapConversion.Key == 8)
+                            {
+                                // 1/8: Remove the second note
+                                if (currentHitPosition % 2 == 1)
+                                {
+                                    toRemove.Add(hits[j]);
+                                }
+                            }
+                            else
+                            {
+                                // 1/6 and 1/3: Remove the second note and adjust the third
+                                if (currentHitPosition % 3 == 1)
+                                {
+                                    toRemove.Add(hits[j]);
+                                }
+                                else if (currentHitPosition % 3 == 2 && j < hits.Count - 1)
+                                {
+                                    double offset = controlPointInfo.TimingPointAt(hits[j].StartTime).BeatLength / snapConversion.Value;
+                                    hits[j].StartTime = hits[j + 1].StartTime - offset;
+                                }
+                            }
+                        }
+                    }
+                }
+
+                // Remove queued notes
+                taikoBeatmap.HitObjects.RemoveAll(obj => toRemove.Contains(obj));
+            }
+        }
+
+        private int getSnapBetweenNotes(ControlPointInfo controlPointInfo, Hit currentNote, Hit nextNote)
+        {
+            double gapMs = nextNote.StartTime - currentNote.StartTime;
+            var currentTimingPoint = controlPointInfo.TimingPointAt(currentNote.StartTime);
+
+            return controlPointInfo.GetClosestBeatDivisor(gapMs + currentTimingPoint.Time);
+        }
+
+        private bool shouldProcessRhythm(int snap)
+        {
+            return snap switch
+            {
+                3 => OneThirdConversion.Value,
+                6 => OneSixthConversion.Value,
+                8 => OneEighthConversion.Value,
+                _ => false,
+            };
+        }
+    }
+}

osu.Game.Rulesets.Taiko/TaikoRuleset.cs

@@ -130,6 +130,7 @@ public override IEnumerable<Mod> GetModsFor(ModType type)
                         new TaikoModEasy(),
                         new TaikoModNoFail(),
                         new MultiMod(new TaikoModHalfTime(), new TaikoModDaycore()),
+                        new TaikoModQuarterize(),
                     };
 
                 case ModType.DifficultyIncrease: