diff --git a/osu.Game.Rulesets.Osu/Difficulty/Evaluators/SpeedEvaluator.cs b/osu.Game.Rulesets.Osu/Difficulty/Evaluators/SpeedEvaluator.cs index a5f6468f17..e5e9769081 100644 --- a/osu.Game.Rulesets.Osu/Difficulty/Evaluators/SpeedEvaluator.cs +++ b/osu.Game.Rulesets.Osu/Difficulty/Evaluators/SpeedEvaluator.cs @@ -2,9 +2,13 @@ // See the LICENCE file in the repository root for full licence text. using System; +using System.Collections.Generic; +using System.Linq; using osu.Game.Rulesets.Difficulty.Preprocessing; using osu.Game.Rulesets.Difficulty.Utils; +using osu.Game.Rulesets.Mods; using osu.Game.Rulesets.Osu.Difficulty.Preprocessing; +using osu.Game.Rulesets.Osu.Mods; using osu.Game.Rulesets.Osu.Objects; namespace osu.Game.Rulesets.Osu.Difficulty.Evaluators @@ -24,7 +28,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Evaluators /// and how easily they can be cheesed. /// /// - public static double EvaluateDifficultyOf(DifficultyHitObject current) + public static double EvaluateDifficultyOf(DifficultyHitObject current, IReadOnlyList mods) { if (current.BaseObject is Spinner) return 0; @@ -56,6 +60,9 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Evaluators // Max distance bonus is 1 * `distance_multiplier` at single_spacing_threshold double distanceBonus = Math.Pow(distance / single_spacing_threshold, 3.95) * distance_multiplier; + if (mods.OfType().Any()) + distanceBonus = 0; + // Base difficulty with all bonuses double difficulty = (1 + speedBonus + distanceBonus) * 1000 / strainTime; diff --git a/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs b/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs index eb3a44c07e..78a1c95066 100644 --- a/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs +++ b/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs @@ -69,6 +69,12 @@ namespace osu.Game.Rulesets.Osu.Difficulty speedRating = 0.0; flashlightRating *= 0.7; } + else if (mods.Any(h => h is OsuModAutopilot)) + { + speedRating *= 0.5; + aimRating = 0.0; + flashlightRating *= 0.4; + } double baseAimPerformance = OsuStrainSkill.DifficultyToPerformance(aimRating); double baseSpeedPerformance = OsuStrainSkill.DifficultyToPerformance(speedRating); diff --git a/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs b/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs index e6600d1ce0..8f09147c9f 100644 --- a/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs +++ b/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs @@ -136,6 +136,9 @@ namespace osu.Game.Rulesets.Osu.Difficulty private double computeAimValue(ScoreInfo score, OsuDifficultyAttributes attributes) { + if (score.Mods.Any(h => h is OsuModAutopilot)) + return 0.0; + double aimDifficulty = attributes.AimDifficulty; if (attributes.SliderCount > 0 && attributes.AimDifficultSliderCount > 0) @@ -218,6 +221,9 @@ namespace osu.Game.Rulesets.Osu.Difficulty if (attributes.ApproachRate > 10.33) approachRateFactor = 0.3 * (attributes.ApproachRate - 10.33); + if (score.Mods.Any(h => h is OsuModAutopilot)) + approachRateFactor = 0.0; + speedValue *= 1.0 + approachRateFactor * lengthBonus; // Buff for longer maps with high AR. if (score.Mods.Any(m => m is OsuModBlinds)) diff --git a/osu.Game.Rulesets.Osu/Difficulty/Skills/Speed.cs b/osu.Game.Rulesets.Osu/Difficulty/Skills/Speed.cs index d107cb75b7..10d5c1e27e 100644 --- a/osu.Game.Rulesets.Osu/Difficulty/Skills/Speed.cs +++ b/osu.Game.Rulesets.Osu/Difficulty/Skills/Speed.cs @@ -36,7 +36,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills protected override double StrainValueAt(DifficultyHitObject current) { currentStrain *= strainDecay(((OsuDifficultyHitObject)current).StrainTime); - currentStrain += SpeedEvaluator.EvaluateDifficultyOf(current) * skillMultiplier; + currentStrain += SpeedEvaluator.EvaluateDifficultyOf(current, Mods) * skillMultiplier; currentRhythm = RhythmEvaluator.EvaluateDifficultyOf(current); diff --git a/osu.Game.Rulesets.Taiko.Tests/TaikoDifficultyCalculatorTest.cs b/osu.Game.Rulesets.Taiko.Tests/TaikoDifficultyCalculatorTest.cs index 09d6540f72..ba247c68d4 100644 --- a/osu.Game.Rulesets.Taiko.Tests/TaikoDifficultyCalculatorTest.cs +++ b/osu.Game.Rulesets.Taiko.Tests/TaikoDifficultyCalculatorTest.cs @@ -14,13 +14,13 @@ namespace osu.Game.Rulesets.Taiko.Tests { protected override string ResourceAssembly => "osu.Game.Rulesets.Taiko"; - [TestCase(3.0920212594351191d, 200, "diffcalc-test")] - [TestCase(3.0920212594351191d, 200, "diffcalc-test-strong")] + [TestCase(3.0950934814938953d, 200, "diffcalc-test")] + [TestCase(3.0950934814938953d, 200, "diffcalc-test-strong")] public void Test(double expectedStarRating, int expectedMaxCombo, string name) => base.Test(expectedStarRating, expectedMaxCombo, name); - [TestCase(4.0789820318081444d, 200, "diffcalc-test")] - [TestCase(4.0789820318081444d, 200, "diffcalc-test-strong")] + [TestCase(4.0839365008715403d, 200, "diffcalc-test")] + [TestCase(4.0839365008715403d, 200, "diffcalc-test-strong")] public void TestClockRateAdjusted(double expectedStarRating, int expectedMaxCombo, string name) => Test(expectedStarRating, expectedMaxCombo, name, new TaikoModDoubleTime()); diff --git a/osu.Game.Rulesets.Taiko/Difficulty/Evaluators/RhythmEvaluator.cs b/osu.Game.Rulesets.Taiko/Difficulty/Evaluators/RhythmEvaluator.cs new file mode 100644 index 0000000000..3a294f7123 --- /dev/null +++ b/osu.Game.Rulesets.Taiko/Difficulty/Evaluators/RhythmEvaluator.cs @@ -0,0 +1,149 @@ +// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. +// See the LICENCE file in the repository root for full licence text. + +using System; +using System.Collections.Generic; +using osu.Game.Rulesets.Difficulty.Preprocessing; +using osu.Game.Rulesets.Difficulty.Utils; +using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing; +using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Rhythm; +using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Rhythm.Data; + +namespace osu.Game.Rulesets.Taiko.Difficulty.Evaluators +{ + public class RhythmEvaluator + { + /// + /// Multiplier for a given denominator term. + /// + private static double termPenalty(double ratio, int denominator, double power, double multiplier) + { + return -multiplier * Math.Pow(Math.Cos(denominator * Math.PI * ratio), power); + } + + /// + /// Calculates the difficulty of a given ratio using a combination of periodic penalties and bonuses. + /// + private static double ratioDifficulty(double ratio, int terms = 8) + { + double difficulty = 0; + + for (int i = 1; i <= terms; ++i) + { + difficulty += termPenalty(ratio, i, 2, 1); + } + + difficulty += terms; + + // Give bonus to near-1 ratios + difficulty += DifficultyCalculationUtils.BellCurve(ratio, 1, 0.7); + + // Penalize ratios that are VERY near 1 + difficulty -= DifficultyCalculationUtils.BellCurve(ratio, 1, 0.5); + + return difficulty / Math.Sqrt(8); + } + + /// + /// Determines if the changes in hit object intervals is consistent based on a given threshold. + /// + private static double repeatedIntervalPenalty(SameRhythmHitObjects sameRhythmHitObjects, double hitWindow, double threshold = 0.1) + { + double longIntervalPenalty = sameInterval(sameRhythmHitObjects, 3); + + double shortIntervalPenalty = sameRhythmHitObjects.Children.Count < 6 + ? sameInterval(sameRhythmHitObjects, 4) + : 1.0; // Returns a non-penalty if there are 6 or more notes within an interval. + + // Scale penalties dynamically based on hit object duration relative to hitWindow. + double penaltyScaling = Math.Max(1 - sameRhythmHitObjects.Duration / (hitWindow * 2), 0.5); + + return Math.Min(longIntervalPenalty, shortIntervalPenalty) * penaltyScaling; + + double sameInterval(SameRhythmHitObjects startObject, int intervalCount) + { + List intervals = new List(); + var currentObject = startObject; + + for (int i = 0; i < intervalCount && currentObject != null; i++) + { + intervals.Add(currentObject.HitObjectInterval); + currentObject = currentObject.Previous; + } + + intervals.RemoveAll(interval => interval == null); + + if (intervals.Count < intervalCount) + return 1.0; // No penalty if there aren't enough valid intervals. + + for (int i = 0; i < intervals.Count; i++) + { + for (int j = i + 1; j < intervals.Count; j++) + { + double ratio = intervals[i]!.Value / intervals[j]!.Value; + if (Math.Abs(1 - ratio) <= threshold) // If any two intervals are similar, apply a penalty. + return 0.3; + } + } + + return 1.0; // No penalty if all intervals are different. + } + } + + private static double evaluateDifficultyOf(SameRhythmHitObjects sameRhythmHitObjects, double hitWindow) + { + double intervalDifficulty = ratioDifficulty(sameRhythmHitObjects.HitObjectIntervalRatio); + double? previousInterval = sameRhythmHitObjects.Previous?.HitObjectInterval; + + // If a previous interval exists and there are multiple hit objects in the sequence: + if (previousInterval != null && sameRhythmHitObjects.Children.Count > 1) + { + double expectedDurationFromPrevious = (double)previousInterval * sameRhythmHitObjects.Children.Count; + double durationDifference = sameRhythmHitObjects.Duration - expectedDurationFromPrevious; + + if (durationDifference > 0) + { + intervalDifficulty *= DifficultyCalculationUtils.Logistic( + durationDifference / hitWindow, + midpointOffset: 0.7, + multiplier: 1.5, + maxValue: 1); + } + } + + // Apply consistency penalty. + intervalDifficulty *= repeatedIntervalPenalty(sameRhythmHitObjects, hitWindow); + + // Penalise patterns that can be hit within a single hit window. + intervalDifficulty *= DifficultyCalculationUtils.Logistic( + sameRhythmHitObjects.Duration / hitWindow, + midpointOffset: 0.6, + multiplier: 1, + maxValue: 1); + + return Math.Pow(intervalDifficulty, 0.75); + } + + private static double evaluateDifficultyOf(SamePatterns samePatterns) + { + return ratioDifficulty(samePatterns.IntervalRatio); + } + + /// + /// Evaluate the difficulty of a hitobject considering its interval change. + /// + public static double EvaluateDifficultyOf(DifficultyHitObject hitObject, double hitWindow) + { + TaikoDifficultyHitObjectRhythm rhythm = ((TaikoDifficultyHitObject)hitObject).Rhythm; + double difficulty = 0.0d; + + if (rhythm.SameRhythmHitObjects?.FirstHitObject == hitObject) // Difficulty for SameRhythmHitObjects + difficulty += evaluateDifficultyOf(rhythm.SameRhythmHitObjects, hitWindow); + + if (rhythm.SamePatterns?.FirstHitObject == hitObject) // Difficulty for SamePatterns + difficulty += 0.5 * evaluateDifficultyOf(rhythm.SamePatterns); + + return difficulty; + } + } +} diff --git a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/Data/SamePatterns.cs b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/Data/SamePatterns.cs new file mode 100644 index 0000000000..50839c4561 --- /dev/null +++ b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/Data/SamePatterns.cs @@ -0,0 +1,55 @@ +// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. +// See the LICENCE file in the repository root for full licence text. + +using System.Collections.Generic; +using System.Linq; + +namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Rhythm.Data +{ + /// + /// Represents grouped by their 's interval. + /// + public class SamePatterns : SameRhythm + { + public SamePatterns? Previous { get; private set; } + + /// + /// The between children within this group. + /// If there is only one child, this will have the value of the first child's . + /// + public double ChildrenInterval => Children.Count > 1 ? Children[1].Interval : Children[0].Interval; + + /// + /// The ratio of between this and the previous . In the + /// case where there is no previous , this will have a value of 1. + /// + public double IntervalRatio => ChildrenInterval / Previous?.ChildrenInterval ?? 1.0d; + + public TaikoDifficultyHitObject FirstHitObject => Children[0].FirstHitObject; + + public IEnumerable AllHitObjects => Children.SelectMany(child => child.Children); + + private SamePatterns(SamePatterns? previous, List data, ref int i) + : base(data, ref i, 5) + { + Previous = previous; + + foreach (TaikoDifficultyHitObject hitObject in AllHitObjects) + { + hitObject.Rhythm.SamePatterns = this; + } + } + + public static void GroupPatterns(List data) + { + List samePatterns = new List(); + + // Index does not need to be incremented, as it is handled within the SameRhythm constructor. + for (int i = 0; i < data.Count;) + { + SamePatterns? previous = samePatterns.Count > 0 ? samePatterns[^1] : null; + samePatterns.Add(new SamePatterns(previous, data, ref i)); + } + } + } +} diff --git a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/Data/SameRhythm.cs b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/Data/SameRhythm.cs new file mode 100644 index 0000000000..b1ca22595b --- /dev/null +++ b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/Data/SameRhythm.cs @@ -0,0 +1,73 @@ +// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. +// See the LICENCE file in the repository root for full licence text. + +using System; +using System.Collections.Generic; + +namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Rhythm.Data +{ + /// + /// A base class for grouping s by their interval. In edges where an interval change + /// occurs, the is added to the group with the smaller interval. + /// + public abstract class SameRhythm + where ChildType : IHasInterval + { + public IReadOnlyList Children { get; private set; } + + /// + /// Determines if the intervals between two child objects are within a specified margin of error, + /// indicating that the intervals are effectively "flat" or consistent. + /// + private bool isFlat(ChildType current, ChildType previous, double marginOfError) + { + return Math.Abs(current.Interval - previous.Interval) <= marginOfError; + } + + /// + /// Create a new from a list of s, and add + /// them to the list until the end of the group. + /// + /// The list of s. + /// + /// Index in to start adding children. This will be modified and should be passed into + /// the next 's constructor. + /// + /// + /// The margin of error for the interval, within of which no interval change is considered to have occured. + /// + protected SameRhythm(List data, ref int i, double marginOfError) + { + List children = new List(); + Children = children; + children.Add(data[i]); + i++; + + for (; i < data.Count - 1; i++) + { + // An interval change occured, add the current data if the next interval is larger. + if (!isFlat(data[i], data[i + 1], marginOfError)) + { + if (data[i + 1].Interval > data[i].Interval + marginOfError) + { + children.Add(data[i]); + i++; + } + + return; + } + + // No interval change occured + children.Add(data[i]); + } + + // Check if the last two objects in the data form a "flat" rhythm pattern within the specified margin of error. + // If true, add the current object to the group and increment the index to process the next object. + if (data.Count > 2 && isFlat(data[^1], data[^2], marginOfError)) + { + children.Add(data[i]); + i++; + } + } + } +} diff --git a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/Data/SameRhythmHitObjects.cs b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/Data/SameRhythmHitObjects.cs new file mode 100644 index 0000000000..0ccc6da026 --- /dev/null +++ b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/Data/SameRhythmHitObjects.cs @@ -0,0 +1,94 @@ +// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. +// See the LICENCE file in the repository root for full licence text. + +using System.Collections.Generic; +using osu.Game.Rulesets.Difficulty.Preprocessing; + +namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Rhythm.Data +{ + /// + /// Represents a group of s with no rhythm variation. + /// + public class SameRhythmHitObjects : SameRhythm, IHasInterval + { + public TaikoDifficultyHitObject FirstHitObject => Children[0]; + + public SameRhythmHitObjects? Previous; + + /// + /// of the first hit object. + /// + public double StartTime => Children[0].StartTime; + + /// + /// The interval between the first and final hit object within this group. + /// + public double Duration => Children[^1].StartTime - Children[0].StartTime; + + /// + /// The interval in ms of each hit object in this . This is only defined if there is + /// more than two hit objects in this . + /// + public double? HitObjectInterval; + + /// + /// The ratio of between this and the previous . In the + /// case where one or both of the is undefined, this will have a value of 1. + /// + public double HitObjectIntervalRatio = 1; + + /// + /// The interval between the of this and the previous . + /// + public double Interval { get; private set; } = double.PositiveInfinity; + + public SameRhythmHitObjects(SameRhythmHitObjects? previous, List data, ref int i) + : base(data, ref i, 5) + { + Previous = previous; + + foreach (var hitObject in Children) + { + hitObject.Rhythm.SameRhythmHitObjects = this; + + // Pass the HitObjectInterval to each child. + hitObject.HitObjectInterval = HitObjectInterval; + } + + calculateIntervals(); + } + + public static List GroupHitObjects(List data) + { + List flatPatterns = new List(); + + // Index does not need to be incremented, as it is handled within SameRhythm's constructor. + for (int i = 0; i < data.Count;) + { + SameRhythmHitObjects? previous = flatPatterns.Count > 0 ? flatPatterns[^1] : null; + flatPatterns.Add(new SameRhythmHitObjects(previous, data, ref i)); + } + + return flatPatterns; + } + + private void calculateIntervals() + { + // Calculate the average interval between hitobjects, or null if there are fewer than two. + HitObjectInterval = Children.Count < 2 ? null : (Children[^1].StartTime - Children[0].StartTime) / (Children.Count - 1); + + // If both the current and previous intervals are available, calculate the ratio. + if (Previous?.HitObjectInterval != null && HitObjectInterval != null) + { + HitObjectIntervalRatio = HitObjectInterval.Value / Previous.HitObjectInterval.Value; + } + + if (Previous == null) + { + return; + } + + Interval = StartTime - Previous.StartTime; + } + } +} diff --git a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/IHasInterval.cs b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/IHasInterval.cs new file mode 100644 index 0000000000..8f3917cbde --- /dev/null +++ b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/IHasInterval.cs @@ -0,0 +1,13 @@ +// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. +// See the LICENCE file in the repository root for full licence text. + +namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Rhythm +{ + /// + /// The interface for hitobjects that provide an interval value. + /// + public interface IHasInterval + { + double Interval { get; } + } +} diff --git a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/TaikoDifficultyHitObjectRhythm.cs b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/TaikoDifficultyHitObjectRhythm.cs index a273d7e2ea..beb7bfe5f6 100644 --- a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/TaikoDifficultyHitObjectRhythm.cs +++ b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/Rhythm/TaikoDifficultyHitObjectRhythm.cs @@ -1,35 +1,98 @@ // Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. // See the LICENCE file in the repository root for full licence text. +using System; +using System.Linq; +using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Rhythm.Data; + namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Rhythm { /// - /// Represents a rhythm change in a taiko map. + /// Stores rhythm data for a . /// public class TaikoDifficultyHitObjectRhythm { /// - /// The difficulty multiplier associated with this rhythm change. + /// The group of hit objects with consistent rhythm that this object belongs to. /// - public readonly double Difficulty; + public SameRhythmHitObjects? SameRhythmHitObjects; /// - /// The ratio of current - /// to previous for the rhythm change. + /// The larger pattern of rhythm groups that this object is part of. + /// + public SamePatterns? SamePatterns; + + /// + /// The ratio of current + /// to previous for the rhythm change. /// A above 1 indicates a slow-down; a below 1 indicates a speed-up. /// public readonly double Ratio; + /// + /// List of most common rhythm changes in taiko maps. Based on how each object's interval compares to the previous object. + /// + /// + /// The general guidelines for the values are: + /// + /// rhythm changes with ratio closer to 1 (that are not 1) are harder to play, + /// speeding up is generally harder than slowing down (with exceptions of rhythm changes requiring a hand switch). + /// + /// + private static readonly TaikoDifficultyHitObjectRhythm[] common_rhythms = + { + new TaikoDifficultyHitObjectRhythm(1, 1), + new TaikoDifficultyHitObjectRhythm(2, 1), + new TaikoDifficultyHitObjectRhythm(1, 2), + new TaikoDifficultyHitObjectRhythm(3, 1), + new TaikoDifficultyHitObjectRhythm(1, 3), + new TaikoDifficultyHitObjectRhythm(3, 2), + new TaikoDifficultyHitObjectRhythm(2, 3), + new TaikoDifficultyHitObjectRhythm(5, 4), + new TaikoDifficultyHitObjectRhythm(4, 5) + }; + + /// + /// Initialises a new instance of s, + /// calculating the closest rhythm change and its associated difficulty for the current hit object. + /// + /// The current being processed. + public TaikoDifficultyHitObjectRhythm(TaikoDifficultyHitObject current) + { + var previous = current.Previous(0); + + if (previous == null) + { + Ratio = 1; + return; + } + + TaikoDifficultyHitObjectRhythm closestRhythm = getClosestRhythm(current.DeltaTime, previous.DeltaTime); + Ratio = closestRhythm.Ratio; + } + /// /// Creates an object representing a rhythm change. /// /// The numerator for . /// The denominator for - /// The difficulty multiplier associated with this rhythm change. - public TaikoDifficultyHitObjectRhythm(int numerator, int denominator, double difficulty) + private TaikoDifficultyHitObjectRhythm(int numerator, int denominator) { Ratio = numerator / (double)denominator; - Difficulty = difficulty; + } + + /// + /// Determines the closest rhythm change from that matches the timing ratio + /// between the current and previous intervals. + /// + /// The time difference between the current hit object and the previous one. + /// The time difference between the previous hit object and the one before it. + /// The closest matching rhythm from . + private TaikoDifficultyHitObjectRhythm getClosestRhythm(double currentDeltaTime, double previousDeltaTime) + { + double ratio = currentDeltaTime / previousDeltaTime; + return common_rhythms.OrderBy(x => Math.Abs(x.Ratio - ratio)).First(); } } } + diff --git a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/TaikoDifficultyHitObject.cs b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/TaikoDifficultyHitObject.cs index e741e4c9e7..dfcd08ed94 100644 --- a/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/TaikoDifficultyHitObject.cs +++ b/osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/TaikoDifficultyHitObject.cs @@ -1,7 +1,6 @@ // Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. // See the LICENCE file in the repository root for full licence text. -using System; using System.Collections.Generic; using System.Linq; using osu.Game.Rulesets.Difficulty.Preprocessing; @@ -15,7 +14,7 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing /// /// Represents a single hit object in taiko difficulty calculation. /// - public class TaikoDifficultyHitObject : DifficultyHitObject + public class TaikoDifficultyHitObject : DifficultyHitObject, IHasInterval { /// /// The list of all of the same colour as this in the beatmap. @@ -42,6 +41,11 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing /// public readonly TaikoDifficultyHitObjectRhythm Rhythm; + /// + /// The interval between this hit object and the surrounding hit objects in its rhythm group. + /// + public double? HitObjectInterval { get; set; } + /// /// Colour data for this hit object. This is used by colour evaluator to calculate colour difficulty, but can be used /// by other skills in the future. @@ -58,6 +62,8 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing /// public double CurrentSliderVelocity; + public double Interval => DeltaTime; + /// /// Creates a new difficulty hit object. /// @@ -81,7 +87,9 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing // Create the Colour object, its properties should be filled in by TaikoDifficultyPreprocessor Colour = new TaikoDifficultyHitObjectColour(); - Rhythm = getClosestRhythm(lastObject, lastLastObject, clockRate); + + // Create a Rhythm object, its properties are filled in by TaikoDifficultyHitObjectRhythm + Rhythm = new TaikoDifficultyHitObjectRhythm(this); switch ((hitObject as Hit)?.Type) { @@ -105,43 +113,6 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing } } - /// - /// List of most common rhythm changes in taiko maps. - /// - /// - /// The general guidelines for the values are: - /// - /// rhythm changes with ratio closer to 1 (that are not 1) are harder to play, - /// speeding up is generally harder than slowing down (with exceptions of rhythm changes requiring a hand switch). - /// - /// - private static readonly TaikoDifficultyHitObjectRhythm[] common_rhythms = - { - new TaikoDifficultyHitObjectRhythm(1, 1, 0.0), - new TaikoDifficultyHitObjectRhythm(2, 1, 0.3), - new TaikoDifficultyHitObjectRhythm(1, 2, 0.5), - new TaikoDifficultyHitObjectRhythm(3, 1, 0.3), - new TaikoDifficultyHitObjectRhythm(1, 3, 0.35), - new TaikoDifficultyHitObjectRhythm(3, 2, 0.6), // purposefully higher (requires hand switch in full alternating gameplay style) - new TaikoDifficultyHitObjectRhythm(2, 3, 0.4), - new TaikoDifficultyHitObjectRhythm(5, 4, 0.5), - new TaikoDifficultyHitObjectRhythm(4, 5, 0.7) - }; - - /// - /// Returns the closest rhythm change from required to hit this object. - /// - /// The gameplay preceding this one. - /// The gameplay preceding . - /// The rate of the gameplay clock. - private TaikoDifficultyHitObjectRhythm getClosestRhythm(HitObject lastObject, HitObject lastLastObject, double clockRate) - { - double prevLength = (lastObject.StartTime - lastLastObject.StartTime) / clockRate; - double ratio = DeltaTime / prevLength; - - return common_rhythms.OrderBy(x => Math.Abs(x.Ratio - ratio)).First(); - } - public TaikoDifficultyHitObject? PreviousMono(int backwardsIndex) => monoDifficultyHitObjects?.ElementAtOrDefault(MonoIndex - (backwardsIndex + 1)); public TaikoDifficultyHitObject? NextMono(int forwardsIndex) => monoDifficultyHitObjects?.ElementAtOrDefault(MonoIndex + (forwardsIndex + 1)); diff --git a/osu.Game.Rulesets.Taiko/Difficulty/Skills/Rhythm.cs b/osu.Game.Rulesets.Taiko/Difficulty/Skills/Rhythm.cs index e76af13686..4fe1ea693e 100644 --- a/osu.Game.Rulesets.Taiko/Difficulty/Skills/Rhythm.cs +++ b/osu.Game.Rulesets.Taiko/Difficulty/Skills/Rhythm.cs @@ -1,13 +1,11 @@ // Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. // See the LICENCE file in the repository root for full licence text. -using System; using osu.Game.Rulesets.Difficulty.Preprocessing; using osu.Game.Rulesets.Difficulty.Skills; +using osu.Game.Rulesets.Difficulty.Utils; using osu.Game.Rulesets.Mods; -using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing; -using osu.Game.Rulesets.Taiko.Objects; -using osu.Game.Utils; +using osu.Game.Rulesets.Taiko.Difficulty.Evaluators; namespace osu.Game.Rulesets.Taiko.Difficulty.Skills { @@ -16,158 +14,25 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Skills /// public class Rhythm : StrainDecaySkill { - protected override double SkillMultiplier => 10; - protected override double StrainDecayBase => 0; + protected override double SkillMultiplier => 1.0; + protected override double StrainDecayBase => 0.4; - /// - /// The note-based decay for rhythm strain. - /// - /// - /// is not used here, as it's time- and not note-based. - /// - private const double strain_decay = 0.96; + private readonly double greatHitWindow; - /// - /// Maximum number of entries in . - /// - private const int rhythm_history_max_length = 8; - - /// - /// Contains the last changes in note sequence rhythms. - /// - private readonly LimitedCapacityQueue rhythmHistory = new LimitedCapacityQueue(rhythm_history_max_length); - - /// - /// Contains the rolling rhythm strain. - /// Used to apply per-note decay. - /// - private double currentStrain; - - /// - /// Number of notes since the last rhythm change has taken place. - /// - private int notesSinceRhythmChange; - - public Rhythm(Mod[] mods) + public Rhythm(Mod[] mods, double greatHitWindow) : base(mods) { + this.greatHitWindow = greatHitWindow; } protected override double StrainValueOf(DifficultyHitObject current) { - // drum rolls and swells are exempt. - if (!(current.BaseObject is Hit)) - { - resetRhythmAndStrain(); - return 0.0; - } + double difficulty = RhythmEvaluator.EvaluateDifficultyOf(current, greatHitWindow); - currentStrain *= strain_decay; + // To prevent abuse of exceedingly long intervals between awkward rhythms, we penalise its difficulty. + difficulty *= DifficultyCalculationUtils.Logistic(current.DeltaTime, 350, -1 / 25.0, 0.5) + 0.5; - TaikoDifficultyHitObject hitObject = (TaikoDifficultyHitObject)current; - notesSinceRhythmChange += 1; - - // rhythm difficulty zero (due to rhythm not changing) => no rhythm strain. - if (hitObject.Rhythm.Difficulty == 0.0) - { - return 0.0; - } - - double objectStrain = hitObject.Rhythm.Difficulty; - - objectStrain *= repetitionPenalties(hitObject); - objectStrain *= patternLengthPenalty(notesSinceRhythmChange); - objectStrain *= speedPenalty(hitObject.DeltaTime); - - // careful - needs to be done here since calls above read this value - notesSinceRhythmChange = 0; - - currentStrain += objectStrain; - return currentStrain; - } - - /// - /// Returns a penalty to apply to the current hit object caused by repeating rhythm changes. - /// - /// - /// Repetitions of more recent patterns are associated with a higher penalty. - /// - /// The current hit object being considered. - private double repetitionPenalties(TaikoDifficultyHitObject hitObject) - { - double penalty = 1; - - rhythmHistory.Enqueue(hitObject); - - for (int mostRecentPatternsToCompare = 2; mostRecentPatternsToCompare <= rhythm_history_max_length / 2; mostRecentPatternsToCompare++) - { - for (int start = rhythmHistory.Count - mostRecentPatternsToCompare - 1; start >= 0; start--) - { - if (!samePattern(start, mostRecentPatternsToCompare)) - continue; - - int notesSince = hitObject.Index - rhythmHistory[start].Index; - penalty *= repetitionPenalty(notesSince); - break; - } - } - - return penalty; - } - - /// - /// Determines whether the rhythm change pattern starting at is a repeat of any of the - /// . - /// - private bool samePattern(int start, int mostRecentPatternsToCompare) - { - for (int i = 0; i < mostRecentPatternsToCompare; i++) - { - if (rhythmHistory[start + i].Rhythm != rhythmHistory[rhythmHistory.Count - mostRecentPatternsToCompare + i].Rhythm) - return false; - } - - return true; - } - - /// - /// Calculates a single rhythm repetition penalty. - /// - /// Number of notes since the last repetition of a rhythm change. - private static double repetitionPenalty(int notesSince) => Math.Min(1.0, 0.032 * notesSince); - - /// - /// Calculates a penalty based on the number of notes since the last rhythm change. - /// Both rare and frequent rhythm changes are penalised. - /// - /// Number of notes since the last rhythm change. - private static double patternLengthPenalty(int patternLength) - { - double shortPatternPenalty = Math.Min(0.15 * patternLength, 1.0); - double longPatternPenalty = Math.Clamp(2.5 - 0.15 * patternLength, 0.0, 1.0); - return Math.Min(shortPatternPenalty, longPatternPenalty); - } - - /// - /// Calculates a penalty for objects that do not require alternating hands. - /// - /// Time (in milliseconds) since the last hit object. - private double speedPenalty(double deltaTime) - { - if (deltaTime < 80) return 1; - if (deltaTime < 210) return Math.Max(0, 1.4 - 0.005 * deltaTime); - - resetRhythmAndStrain(); - return 0.0; - } - - /// - /// Resets the rolling strain value and counter. - /// - private void resetRhythmAndStrain() - { - currentStrain = 0.0; - notesSinceRhythmChange = 0; + return difficulty; } } } diff --git a/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs b/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs index d3cdb379d5..ef729e1f07 100644 --- a/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs +++ b/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs @@ -10,18 +10,6 @@ namespace osu.Game.Rulesets.Taiko.Difficulty { public class TaikoDifficultyAttributes : DifficultyAttributes { - /// - /// The difficulty corresponding to the stamina skill. - /// - [JsonProperty("stamina_difficulty")] - public double StaminaDifficulty { get; set; } - - /// - /// The ratio of stamina difficulty from mono-color (single colour) streams to total stamina difficulty. - /// - [JsonProperty("mono_stamina_factor")] - public double MonoStaminaFactor { get; set; } - /// /// The difficulty corresponding to the rhythm skill. /// @@ -40,8 +28,20 @@ namespace osu.Game.Rulesets.Taiko.Difficulty [JsonProperty("colour_difficulty")] public double ColourDifficulty { get; set; } - [JsonProperty("rhythm_difficult_strains")] - public double RhythmTopStrains { get; set; } + /// + /// The difficulty corresponding to the stamina skill. + /// + [JsonProperty("stamina_difficulty")] + public double StaminaDifficulty { get; set; } + + /// + /// The ratio of stamina difficulty from mono-color (single colour) streams to total stamina difficulty. + /// + [JsonProperty("mono_stamina_factor")] + public double MonoStaminaFactor { get; set; } + + [JsonProperty("reading_difficult_strains")] + public double ReadingTopStrains { get; set; } [JsonProperty("colour_difficult_strains")] public double ColourTopStrains { get; set; } diff --git a/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs b/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs index 0d6ecb8d3e..f8ff6f6065 100644 --- a/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs +++ b/osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs @@ -14,6 +14,7 @@ using osu.Game.Rulesets.Scoring; using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing; using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Colour; using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Reading; +using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing.Rhythm.Data; using osu.Game.Rulesets.Taiko.Difficulty.Skills; using osu.Game.Rulesets.Taiko.Mods; using osu.Game.Rulesets.Taiko.Scoring; @@ -23,7 +24,7 @@ namespace osu.Game.Rulesets.Taiko.Difficulty public class TaikoDifficultyCalculator : DifficultyCalculator { private const double difficulty_multiplier = 0.084375; - private const double rhythm_skill_multiplier = 0.200 * difficulty_multiplier; + private const double rhythm_skill_multiplier = 1.24 * difficulty_multiplier; private const double reading_skill_multiplier = 0.100 * difficulty_multiplier; private const double colour_skill_multiplier = 0.375 * difficulty_multiplier; private const double stamina_skill_multiplier = 0.375 * difficulty_multiplier; @@ -37,9 +38,12 @@ namespace osu.Game.Rulesets.Taiko.Difficulty protected override Skill[] CreateSkills(IBeatmap beatmap, Mod[] mods, double clockRate) { + HitWindows hitWindows = new HitWindows(); + hitWindows.SetDifficulty(beatmap.Difficulty.OverallDifficulty); + return new Skill[] { - new Rhythm(mods), + new Rhythm(mods, hitWindows.WindowFor(HitResult.Great) / clockRate), new Reading(mods), new Colour(mods), new Stamina(mods, false), @@ -57,6 +61,9 @@ namespace osu.Game.Rulesets.Taiko.Difficulty protected override IEnumerable CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate) { + var hitWindows = new HitWindows(); + hitWindows.SetDifficulty(beatmap.Difficulty.OverallDifficulty); + var difficultyHitObjects = new List(); var centreObjects = new List(); var rimObjects = new List(); @@ -79,7 +86,10 @@ namespace osu.Game.Rulesets.Taiko.Difficulty )); } + var groupedHitObjects = SameRhythmHitObjects.GroupHitObjects(noteObjects); + TaikoColourDifficultyPreprocessor.ProcessAndAssign(difficultyHitObjects); + SamePatterns.GroupPatterns(groupedHitObjects); bpmLoader.ProcessEffectiveBPM(beatmap.ControlPointInfo, clockRate); return difficultyHitObjects; @@ -105,8 +115,8 @@ namespace osu.Game.Rulesets.Taiko.Difficulty double monoStaminaRating = singleColourStamina.DifficultyValue() * stamina_skill_multiplier; double monoStaminaFactor = staminaRating == 0 ? 1 : Math.Pow(monoStaminaRating / staminaRating, 5); - double rhythmDifficultStrains = rhythm.CountTopWeightedStrains(); double colourDifficultStrains = colour.CountTopWeightedStrains(); + double readingDifficultStrains = reading.CountTopWeightedStrains(); double staminaDifficultStrains = stamina.CountTopWeightedStrains(); double combinedRating = combinedDifficultyValue(rhythm, reading, colour, stamina, isRelax); @@ -134,9 +144,9 @@ namespace osu.Game.Rulesets.Taiko.Difficulty ColourDifficulty = colourRating, StaminaDifficulty = staminaRating, MonoStaminaFactor = monoStaminaFactor, - StaminaTopStrains = staminaDifficultStrains, - RhythmTopStrains = rhythmDifficultStrains, + ReadingTopStrains = readingDifficultStrains, ColourTopStrains = colourDifficultStrains, + StaminaTopStrains = staminaDifficultStrains, GreatHitWindow = hitWindows.WindowFor(HitResult.Great) / clockRate, OkHitWindow = hitWindows.WindowFor(HitResult.Ok) / clockRate, MaxCombo = beatmap.GetMaxCombo(), diff --git a/osu.Game/Rulesets/Difficulty/Utils/DifficultyCalculationUtils.cs b/osu.Game/Rulesets/Difficulty/Utils/DifficultyCalculationUtils.cs index 055d8a458b..497a1f8234 100644 --- a/osu.Game/Rulesets/Difficulty/Utils/DifficultyCalculationUtils.cs +++ b/osu.Game/Rulesets/Difficulty/Utils/DifficultyCalculationUtils.cs @@ -56,6 +56,16 @@ namespace osu.Game.Rulesets.Difficulty.Utils /// The p-norm of the vector. public static double Norm(double p, params double[] values) => Math.Pow(values.Sum(x => Math.Pow(x, p)), 1 / p); + /// + /// Calculates a Gaussian-based bell curve function (https://en.wikipedia.org/wiki/Gaussian_function) + /// + /// Value to calculate the function for + /// The mean (center) of the bell curve + /// The width (spread) of the curve + /// Multiplier to adjust the curve's height + /// The output of the bell curve function of + public static double BellCurve(double x, double mean, double width, double multiplier = 1.0) => multiplier * Math.Exp(Math.E * -(Math.Pow(x - mean, 2) / Math.Pow(width, 2))); + /// /// Smootherstep function (https://en.wikipedia.org/wiki/Smoothstep#Variations) ///