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Code Issues Releases Wiki Activity

osu!taiko further considerations for rhythm (#31339)

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* further considerations for rhythm

* new rhythm balancing

* fix license header

* use isNormal to validate ratio

* adjust tests

---------

Co-authored-by: StanR <hi@stanr.info>
This commit is contained in:
Jay Lawton 2025-01-17 21:15:22 +10:00 committed by GitHub
parent a83f917d87
commit a42c03cea4
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GPG Key ID: B5690EEEBB952194
2 changed files with 38 additions and 18 deletions
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8
osu.Game.Rulesets.Taiko.Tests/TaikoDifficultyCalculatorTest.cs
View File

@ -14,13 +14,13 @@ namespace osu.Game.Rulesets.Taiko.Tests
{
protected override string ResourceAssembly => "osu.Game.Rulesets.Taiko";
[TestCase(3.3172381854905493d, 200, "diffcalc-test")]
[TestCase(3.3172381854905493d, 200, "diffcalc-test-strong")]
[TestCase(3.3167800835687551d, 200, "diffcalc-test")]
[TestCase(3.3167800835687551d, 200, "diffcalc-test-strong")]
public void Test(double expectedStarRating, int expectedMaxCombo, string name)
=> base.Test(expectedStarRating, expectedMaxCombo, name);
[TestCase(4.4640702427013101d, 200, "diffcalc-test")]
[TestCase(4.4640702427013101d, 200, "diffcalc-test-strong")]
[TestCase(4.4631326105105122d, 200, "diffcalc-test")]
[TestCase(4.4631326105105122d, 200, "diffcalc-test-strong")]
public void TestClockRateAdjusted(double expectedStarRating, int expectedMaxCombo, string name)
=> Test(expectedStarRating, expectedMaxCombo, name, new TaikoModDoubleTime());

48
osu.Game.Rulesets.Taiko/Difficulty/Evaluators/RhythmEvaluator.cs
View File

@ -21,27 +21,39 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Evaluators
return -multiplier * Math.Pow(Math.Cos(denominator * Math.PI * ratio), power);
}
/// <summary>
/// Validates the ratio by ensuring it is a normal number in cases where maps breach regular mapping conditions.
/// </summary>
private static double validateRatio(double ratio)
{
return double.IsNormal(ratio) ? ratio : 0;
}
/// <summary>
/// Calculates the difficulty of a given ratio using a combination of periodic penalties and bonuses.
/// </summary>
private static double ratioDifficulty(double ratio, int terms = 8)
{
double difficulty = 0;
ratio = validateRatio(ratio);
for (int i = 1; i <= terms; ++i)
{
difficulty += termPenalty(ratio, i, 2, 1);
difficulty += termPenalty(ratio, i, 4, 1);
}
difficulty += terms;
difficulty += terms / (1 + ratio);
// Give bonus to near-1 ratios
difficulty += DifficultyCalculationUtils.BellCurve(ratio, 1, 0.7);
difficulty += DifficultyCalculationUtils.BellCurve(ratio, 1, 0.5);
// Penalize ratios that are VERY near 1
difficulty -= DifficultyCalculationUtils.BellCurve(ratio, 1, 0.5);
difficulty -= DifficultyCalculationUtils.BellCurve(ratio, 1, 0.3);
return difficulty / Math.Sqrt(8);
difficulty = Math.Max(difficulty, 0);
difficulty /= Math.Sqrt(8);
return difficulty;
}
/// <summary>
@ -55,10 +67,10 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Evaluators
? 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);
// The duration penalty is based on hit object duration relative to hitWindow.
double durationPenalty = Math.Max(1 - sameRhythmHitObjects.Duration * 2 / hitWindow, 0.5);
return Math.Min(longIntervalPenalty, shortIntervalPenalty) * penaltyScaling;
return Math.Min(longIntervalPenalty, shortIntervalPenalty) * durationPenalty;
double sameInterval(SameRhythmHitObjects startObject, int intervalCount)
{
@ -82,7 +94,7 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Evaluators
{
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 0.80;
}
}
@ -95,6 +107,8 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Evaluators
double intervalDifficulty = ratioDifficulty(sameRhythmHitObjects.HitObjectIntervalRatio);
double? previousInterval = sameRhythmHitObjects.Previous?.HitObjectInterval;
intervalDifficulty *= repeatedIntervalPenalty(sameRhythmHitObjects, hitWindow);
// If a previous interval exists and there are multiple hit objects in the sequence:
if (previousInterval != null && sameRhythmHitObjects.Children.Count > 1)
{
@ -111,9 +125,6 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Evaluators
}
}
// Apply consistency penalty.
intervalDifficulty *= repeatedIntervalPenalty(sameRhythmHitObjects, hitWindow);
// Penalise patterns that can be hit within a single hit window.
intervalDifficulty *= DifficultyCalculationUtils.Logistic(
sameRhythmHitObjects.Duration / hitWindow,
@ -137,11 +148,20 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Evaluators
TaikoDifficultyHitObjectRhythm rhythm = ((TaikoDifficultyHitObject)hitObject).Rhythm;
double difficulty = 0.0d;
double sameRhythm = 0;
double samePattern = 0;
double intervalPenalty = 0;
if (rhythm.SameRhythmHitObjects?.FirstHitObject == hitObject) // Difficulty for SameRhythmHitObjects
difficulty += evaluateDifficultyOf(rhythm.SameRhythmHitObjects, hitWindow);
{
sameRhythm += 10.0 * evaluateDifficultyOf(rhythm.SameRhythmHitObjects, hitWindow);
intervalPenalty = repeatedIntervalPenalty(rhythm.SameRhythmHitObjects, hitWindow);
}
if (rhythm.SamePatterns?.FirstHitObject == hitObject) // Difficulty for SamePatterns
difficulty += 0.5 * evaluateDifficultyOf(rhythm.SamePatterns);
samePattern += 1.15 * evaluateDifficultyOf(rhythm.SamePatterns);
difficulty += Math.Max(sameRhythm, samePattern) * intervalPenalty;
return difficulty;
}