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Code Issues Releases Wiki Activity

Merge remote-tracking branch 'upstream/master' into test-working-beatmap-clock

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Dean Herbert 2019-02-20 11:37:33 +09:00
commit f2ad2931c7
43 changed files with 959 additions and 953 deletions
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4
osu.Game.Rulesets.Catch.Tests/CatchDifficultyCalculatorTest.cs
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@ -13,11 +13,11 @@ namespace osu.Game.Rulesets.Catch.Tests
{
protected override string ResourceAssembly => "osu.Game.Rulesets.Catch";
[TestCase(3.8664391043534758, "diffcalc-test")]
[TestCase(3.8701854263563118d, "diffcalc-test")]
public void Test(double expected, string name)
=> base.Test(expected, name);
protected override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchDifficultyCalculator(new CatchRuleset(), beatmap);
protected override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchDifficultyCalculator(new CatchRuleset(), beatmap);
protected override Ruleset CreateRuleset() => new CatchRuleset();
}

2
osu.Game.Rulesets.Catch/CatchRuleset.cs
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@ -110,7 +110,7 @@ namespace osu.Game.Rulesets.Catch
public override Drawable CreateIcon() => new SpriteIcon { Icon = FontAwesome.fa_osu_fruits_o };
public override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchDifficultyCalculator(this, beatmap);
public override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new CatchDifficultyCalculator(this, beatmap);
public override int? LegacyID => 2;

6
osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyAttributes.cs
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@ -2,7 +2,6 @@
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Catch.Difficulty
{
@ -10,10 +9,5 @@ namespace osu.Game.Rulesets.Catch.Difficulty
{
public double ApproachRate;
public int MaxCombo;
public CatchDifficultyAttributes(Mod[] mods, double starRating)
: base(mods, starRating)
{
}
}
}

158
osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs
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@ -1,148 +1,86 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. 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.Beatmaps;
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Catch.Difficulty.Preprocessing;
using osu.Game.Rulesets.Catch.Difficulty.Skills;
using osu.Game.Rulesets.Catch.Objects;
using osu.Game.Rulesets.Catch.UI;
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Catch.Difficulty
{
public class CatchDifficultyCalculator : DifficultyCalculator
{
/// <summary>
/// In milliseconds. For difficulty calculation we will only look at the highest strain value in each time interval of size STRAIN_STEP.
/// This is to eliminate higher influence of stream over aim by simply having more HitObjects with high strain.
/// The higher this value, the less strains there will be, indirectly giving long beatmaps an advantage.
/// </summary>
private const double strain_step = 750;
/// <summary>
/// The weighting of each strain value decays to this number * it's previous value
/// </summary>
private const double decay_weight = 0.94;
private const double star_scaling_factor = 0.145;
protected override int SectionLength => 750;
private readonly float halfCatchWidth;
public CatchDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
: base(ruleset, beatmap)
{
var catcher = new CatcherArea.Catcher(beatmap.BeatmapInfo.BaseDifficulty);
halfCatchWidth = catcher.CatchWidth * 0.5f;
}
protected override DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double timeRate)
protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate)
{
if (!beatmap.HitObjects.Any())
return new CatchDifficultyAttributes(mods, 0);
if (beatmap.HitObjects.Count == 0)
return new CatchDifficultyAttributes { Mods = mods };
var catcher = new CatcherArea.Catcher(beatmap.BeatmapInfo.BaseDifficulty);
float halfCatchWidth = catcher.CatchWidth * 0.5f;
// this is the same as osu!, so there's potential to share the implementation... maybe
double preempt = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
var difficultyHitObjects = new List<CatchDifficultyHitObject>();
foreach (var hitObject in beatmap.HitObjects)
return new CatchDifficultyAttributes
{
StarRating = Math.Sqrt(skills[0].DifficultyValue()) * star_scaling_factor,
Mods = mods,
ApproachRate = preempt > 1200.0 ? -(preempt - 1800.0) / 120.0 : -(preempt - 1200.0) / 150.0 + 5.0,
MaxCombo = beatmap.HitObjects.Count(h => h is Fruit) + beatmap.HitObjects.OfType<JuiceStream>().SelectMany(j => j.NestedHitObjects).Count(h => !(h is TinyDroplet))
};
}
protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate)
{
CatchHitObject lastObject = null;
foreach (var hitObject in beatmap.HitObjects.OfType<CatchHitObject>())
{
if (lastObject == null)
{
lastObject = hitObject;
continue;
}
switch (hitObject)
{
// We want to only consider fruits that contribute to the combo. Droplets are addressed as accuracy and spinners are not relevant for "skill" calculations.
case Fruit fruit:
difficultyHitObjects.Add(new CatchDifficultyHitObject(fruit, halfCatchWidth));
yield return new CatchDifficultyHitObject(fruit, lastObject, clockRate, halfCatchWidth);
lastObject = hitObject;
break;
case JuiceStream _:
difficultyHitObjects.AddRange(hitObject.NestedHitObjects.OfType<CatchHitObject>().Where(o => !(o is TinyDroplet)).Select(o => new CatchDifficultyHitObject(o, halfCatchWidth)));
foreach (var nested in hitObject.NestedHitObjects.OfType<CatchHitObject>().Where(o => !(o is TinyDroplet)))
{
yield return new CatchDifficultyHitObject(nested, lastObject, clockRate, halfCatchWidth);
lastObject = nested;
}
break;
}
}
difficultyHitObjects.Sort((a, b) => a.BaseHitObject.StartTime.CompareTo(b.BaseHitObject.StartTime));
if (!calculateStrainValues(difficultyHitObjects, timeRate))
return new CatchDifficultyAttributes(mods, 0);
// this is the same as osu!, so there's potential to share the implementation... maybe
double preempt = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / timeRate;
double starRating = Math.Sqrt(calculateDifficulty(difficultyHitObjects, timeRate)) * star_scaling_factor;
return new CatchDifficultyAttributes(mods, starRating)
{
ApproachRate = preempt > 1200.0 ? -(preempt - 1800.0) / 120.0 : -(preempt - 1200.0) / 150.0 + 5.0,
MaxCombo = difficultyHitObjects.Count
};
}
private bool calculateStrainValues(List<CatchDifficultyHitObject> objects, double timeRate)
protected override Skill[] CreateSkills(IBeatmap beatmap) => new Skill[]
{
CatchDifficultyHitObject lastObject = null;
if (!objects.Any()) return false;
// Traverse hitObjects in pairs to calculate the strain value of NextHitObject from the strain value of CurrentHitObject and environment.
foreach (var currentObject in objects)
{
if (lastObject != null)
currentObject.CalculateStrains(lastObject, timeRate);
lastObject = currentObject;
}
return true;
}
private double calculateDifficulty(List<CatchDifficultyHitObject> objects, double timeRate)
{
// The strain step needs to be adjusted for the algorithm to be considered equal with speed changing mods
double actualStrainStep = strain_step * timeRate;
// Find the highest strain value within each strain step
var highestStrains = new List<double>();
double intervalEndTime = actualStrainStep;
double maximumStrain = 0; // We need to keep track of the maximum strain in the current interval
CatchDifficultyHitObject previousHitObject = null;
foreach (CatchDifficultyHitObject hitObject in objects)
{
// While we are beyond the current interval push the currently available maximum to our strain list
while (hitObject.BaseHitObject.StartTime > intervalEndTime)
{
highestStrains.Add(maximumStrain);
// The maximum strain of the next interval is not zero by default! We need to take the last hitObject we encountered, take its strain and apply the decay
// until the beginning of the next interval.
if (previousHitObject == null)
{
maximumStrain = 0;
}
else
{
double decay = Math.Pow(CatchDifficultyHitObject.DECAY_BASE, (intervalEndTime - previousHitObject.BaseHitObject.StartTime) / 1000);
maximumStrain = previousHitObject.Strain * decay;
}
// Go to the next time interval
intervalEndTime += actualStrainStep;
}
// Obtain maximum strain
maximumStrain = Math.Max(hitObject.Strain, maximumStrain);
previousHitObject = hitObject;
}
// Build the weighted sum over the highest strains for each interval
double difficulty = 0;
double weight = 1;
highestStrains.Sort((a, b) => b.CompareTo(a)); // Sort from highest to lowest strain.
foreach (double strain in highestStrains)
{
difficulty += weight * strain;
weight *= decay_weight;
}
return difficulty;
}
new Movement(),
};
}
}

130
osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyHitObject.cs
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@ -1,130 +0,0 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
using osu.Game.Rulesets.Catch.Objects;
using osu.Game.Rulesets.Catch.UI;
using osuTK;
namespace osu.Game.Rulesets.Catch.Difficulty
{
public class CatchDifficultyHitObject
{
internal static readonly double DECAY_BASE = 0.20;
private const float normalized_hitobject_radius = 41.0f;
private const float absolute_player_positioning_error = 16f;
private readonly float playerPositioningError;
internal CatchHitObject BaseHitObject;
/// <summary>
/// Measures jump difficulty. CtB doesn't have something like button pressing speed or accuracy
/// </summary>
internal double Strain = 1;
/// <summary>
/// This is required to keep track of lazy player movement (always moving only as far as necessary)
/// Without this quick repeat sliders / weirdly shaped streams might become ridiculously overrated
/// </summary>
internal float PlayerPositionOffset;
internal float LastMovement;
internal float NormalizedPosition;
internal float ActualNormalizedPosition => NormalizedPosition + PlayerPositionOffset;
internal CatchDifficultyHitObject(CatchHitObject baseHitObject, float catcherWidthHalf)
{
BaseHitObject = baseHitObject;
// We will scale everything by this factor, so we can assume a uniform CircleSize among beatmaps.
float scalingFactor = normalized_hitobject_radius / catcherWidthHalf;
playerPositioningError = absolute_player_positioning_error; // * scalingFactor;
NormalizedPosition = baseHitObject.X * CatchPlayfield.BASE_WIDTH * scalingFactor;
}
private const double direction_change_bonus = 12.5;
internal void CalculateStrains(CatchDifficultyHitObject previousHitObject, double timeRate)
{
// Rather simple, but more specialized things are inherently inaccurate due to the big difference playstyles and opinions make.
// See Taiko feedback thread.
double timeElapsed = (BaseHitObject.StartTime - previousHitObject.BaseHitObject.StartTime) / timeRate;
double decay = Math.Pow(DECAY_BASE, timeElapsed / 1000);
// Update new position with lazy movement.
PlayerPositionOffset =
MathHelper.Clamp(
previousHitObject.ActualNormalizedPosition,
NormalizedPosition - (normalized_hitobject_radius - playerPositioningError),
NormalizedPosition + (normalized_hitobject_radius - playerPositioningError)) // Obtain new lazy position, but be stricter by allowing for an error of a certain degree of the player.
- NormalizedPosition; // Subtract HitObject position to obtain offset
LastMovement = DistanceTo(previousHitObject);
double addition = spacingWeight(LastMovement);
if (NormalizedPosition < previousHitObject.NormalizedPosition)
{
LastMovement = -LastMovement;
}
CatchHitObject previousHitCircle = previousHitObject.BaseHitObject;
double additionBonus = 0;
double sqrtTime = Math.Sqrt(Math.Max(timeElapsed, 25));
// Direction changes give an extra point!
if (Math.Abs(LastMovement) > 0.1)
{
if (Math.Abs(previousHitObject.LastMovement) > 0.1 && Math.Sign(LastMovement) != Math.Sign(previousHitObject.LastMovement))
{
double bonus = direction_change_bonus / sqrtTime;
// Weight bonus by how
double bonusFactor = Math.Min(playerPositioningError, Math.Abs(LastMovement)) / playerPositioningError;
// We want time to play a role twice here!
addition += bonus * bonusFactor;
// Bonus for tougher direction switches and "almost" hyperdashes at this point
if (previousHitCircle != null && previousHitCircle.DistanceToHyperDash <= 10.0f / CatchPlayfield.BASE_WIDTH)
{
additionBonus += 0.3 * bonusFactor;
}
}
// Base bonus for every movement, giving some weight to streams.
addition += 7.5 * Math.Min(Math.Abs(LastMovement), normalized_hitobject_radius * 2) / (normalized_hitobject_radius * 6) / sqrtTime;
}
// Bonus for "almost" hyperdashes at corner points
if (previousHitCircle != null && previousHitCircle.DistanceToHyperDash <= 10.0f / CatchPlayfield.BASE_WIDTH)
{
if (!previousHitCircle.HyperDash)
{
additionBonus += 1.0;
}
else
{
// After a hyperdash we ARE in the correct position. Always!
PlayerPositionOffset = 0;
}
addition *= 1.0 + additionBonus * ((10 - previousHitCircle.DistanceToHyperDash * CatchPlayfield.BASE_WIDTH) / 10);
}
addition *= 850.0 / Math.Max(timeElapsed, 25);
Strain = previousHitObject.Strain * decay + addition;
}
private static double spacingWeight(float distance)
{
return Math.Pow(distance, 1.3) / 500;
}
internal float DistanceTo(CatchDifficultyHitObject other)
{
return Math.Abs(ActualNormalizedPosition - other.ActualNormalizedPosition);
}
}
}

39
osu.Game.Rulesets.Catch/Difficulty/Preprocessing/CatchDifficultyHitObject.cs Normal file
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@ -0,0 +1,39 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
using osu.Game.Rulesets.Catch.Objects;
using osu.Game.Rulesets.Catch.UI;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Objects;
namespace osu.Game.Rulesets.Catch.Difficulty.Preprocessing
{
public class CatchDifficultyHitObject : DifficultyHitObject
{
private const float normalized_hitobject_radius = 41.0f;
public new CatchHitObject BaseObject => (CatchHitObject)base.BaseObject;
public new CatchHitObject LastObject => (CatchHitObject)base.LastObject;
public readonly float NormalizedPosition;
/// <summary>
/// Milliseconds elapsed since the start time of the previous <see cref="CatchDifficultyHitObject"/>, with a minimum of 25ms.
/// </summary>
public readonly double StrainTime;
public CatchDifficultyHitObject(HitObject hitObject, HitObject lastObject, double clockRate, float halfCatcherWidth)
: base(hitObject, lastObject, clockRate)
{
// We will scale everything by this factor, so we can assume a uniform CircleSize among beatmaps.
var scalingFactor = normalized_hitobject_radius / halfCatcherWidth;
NormalizedPosition = BaseObject.X * CatchPlayfield.BASE_WIDTH * scalingFactor;
// Every strain interval is hard capped at the equivalent of 600 BPM streaming speed as a safety measure
StrainTime = Math.Max(25, DeltaTime);
}
}
}

82
osu.Game.Rulesets.Catch/Difficulty/Skills/Movement.cs Normal file
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@ -0,0 +1,82 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
using osu.Game.Rulesets.Catch.Difficulty.Preprocessing;
using osu.Game.Rulesets.Catch.UI;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osuTK;
namespace osu.Game.Rulesets.Catch.Difficulty.Skills
{
public class Movement : Skill
{
private const float absolute_player_positioning_error = 16f;
private const float normalized_hitobject_radius = 41.0f;
private const double direction_change_bonus = 12.5;
protected override double SkillMultiplier => 850;
protected override double StrainDecayBase => 0.2;
protected override double DecayWeight => 0.94;
private float lastPlayerPosition;
private float lastDistanceMoved;
protected override double StrainValueOf(DifficultyHitObject current)
{
var catchCurrent = (CatchDifficultyHitObject)current;
float playerPosition = MathHelper.Clamp(
lastPlayerPosition,
catchCurrent.NormalizedPosition - (normalized_hitobject_radius - absolute_player_positioning_error),
catchCurrent.NormalizedPosition + (normalized_hitobject_radius - absolute_player_positioning_error)
);
float distanceMoved = playerPosition - lastPlayerPosition;
double distanceAddition = Math.Pow(Math.Abs(distanceMoved), 1.3) / 500;
double sqrtStrain = Math.Sqrt(catchCurrent.StrainTime);
double bonus = 0;
// Direction changes give an extra point!
if (Math.Abs(distanceMoved) > 0.1)
{
if (Math.Abs(lastDistanceMoved) > 0.1 && Math.Sign(distanceMoved) != Math.Sign(lastDistanceMoved))
{
double bonusFactor = Math.Min(absolute_player_positioning_error, Math.Abs(distanceMoved)) / absolute_player_positioning_error;
distanceAddition += direction_change_bonus / sqrtStrain * bonusFactor;
// Bonus for tougher direction switches and "almost" hyperdashes at this point
if (catchCurrent.LastObject.DistanceToHyperDash <= 10 / CatchPlayfield.BASE_WIDTH)
bonus = 0.3 * bonusFactor;
}
// Base bonus for every movement, giving some weight to streams.
distanceAddition += 7.5 * Math.Min(Math.Abs(distanceMoved), normalized_hitobject_radius * 2) / (normalized_hitobject_radius * 6) / sqrtStrain;
}
// Bonus for "almost" hyperdashes at corner points
if (catchCurrent.LastObject.DistanceToHyperDash <= 10.0f / CatchPlayfield.BASE_WIDTH)
{
if (!catchCurrent.LastObject.HyperDash)
bonus += 1.0;
else
{
// After a hyperdash we ARE in the correct position. Always!
playerPosition = catchCurrent.NormalizedPosition;
}
distanceAddition *= 1.0 + bonus * ((10 - catchCurrent.LastObject.DistanceToHyperDash * CatchPlayfield.BASE_WIDTH) / 10);
}
lastPlayerPosition = playerPosition;
lastDistanceMoved = distanceMoved;
return distanceAddition / catchCurrent.StrainTime;
}
}
}

4
osu.Game.Rulesets.Mania.Tests/ManiaDifficultyCalculatorTest.cs
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@ -13,11 +13,11 @@ namespace osu.Game.Rulesets.Mania.Tests
{
protected override string ResourceAssembly => "osu.Game.Rulesets.Mania";
[TestCase(2.2676066895468976, "diffcalc-test")]
[TestCase(2.3683365342338796d, "diffcalc-test")]
public void Test(double expected, string name)
=> base.Test(expected, name);
protected override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new ManiaDifficultyCalculator(new ManiaRuleset(), beatmap);
protected override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new ManiaDifficultyCalculator(new ManiaRuleset(), beatmap);
protected override Ruleset CreateRuleset() => new ManiaRuleset();
}

6
osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyAttributes.cs
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@ -2,17 +2,11 @@
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Mania.Difficulty
{
public class ManiaDifficultyAttributes : DifficultyAttributes
{
public double GreatHitWindow;
public ManiaDifficultyAttributes(Mod[] mods, double starRating)
: base(mods, starRating)
{
}
}
}

146
osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs
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@ -1,34 +1,24 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. 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.Beatmaps;
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mania.Beatmaps;
using osu.Game.Rulesets.Mania.Difficulty.Preprocessing;
using osu.Game.Rulesets.Mania.Difficulty.Skills;
using osu.Game.Rulesets.Mania.Mods;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Mania.Difficulty
{
internal class ManiaDifficultyCalculator : DifficultyCalculator
public class ManiaDifficultyCalculator : DifficultyCalculator
{
private const double star_scaling_factor = 0.018;
/// <summary>
/// In milliseconds. For difficulty calculation we will only look at the highest strain value in each time interval of size strain_step.
/// This is to eliminate higher influence of stream over aim by simply having more HitObjects with high strain.
/// The higher this value, the less strains there will be, indirectly giving long beatmaps an advantage.
/// </summary>
private const double strain_step = 400;
/// <summary>
/// The weighting of each strain value decays to this number * it's previous value
/// </summary>
private const double decay_weight = 0.9;
private readonly bool isForCurrentRuleset;
public ManiaDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
@ -37,108 +27,70 @@ namespace osu.Game.Rulesets.Mania.Difficulty
isForCurrentRuleset = beatmap.BeatmapInfo.Ruleset.Equals(ruleset.RulesetInfo);
}
protected override DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double timeRate)
protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate)
{
if (!beatmap.HitObjects.Any())
return new ManiaDifficultyAttributes(mods, 0);
if (beatmap.HitObjects.Count == 0)
return new ManiaDifficultyAttributes { Mods = mods };
var difficultyHitObjects = new List<ManiaHitObjectDifficulty>();
int columnCount = ((ManiaBeatmap)beatmap).TotalColumns;
// Sort DifficultyHitObjects by StartTime of the HitObjects - just to make sure.
// Note: Stable sort is done so that the ordering of hitobjects with equal start times doesn't change
difficultyHitObjects.AddRange(beatmap.HitObjects.Select(h => new ManiaHitObjectDifficulty((ManiaHitObject)h, columnCount)).OrderBy(h => h.BaseHitObject.StartTime));
if (!calculateStrainValues(difficultyHitObjects, timeRate))
return new ManiaDifficultyAttributes(mods, 0);
double starRating = calculateDifficulty(difficultyHitObjects, timeRate) * star_scaling_factor;
return new ManiaDifficultyAttributes(mods, starRating)
return new ManiaDifficultyAttributes
{
// Todo: This int cast is temporary to achieve 1:1 results with osu!stable, and should be remoevd in the future
GreatHitWindow = (int)(beatmap.HitObjects.First().HitWindows.Great / 2) / timeRate
StarRating = difficultyValue(skills) * star_scaling_factor,
Mods = mods,
// Todo: This int cast is temporary to achieve 1:1 results with osu!stable, and should be removed in the future
GreatHitWindow = (int)(beatmap.HitObjects.First().HitWindows.Great / 2) / clockRate,
};
}
private bool calculateStrainValues(List<ManiaHitObjectDifficulty> objects, double timeRate)
private double difficultyValue(Skill[] skills)
{
// Traverse hitObjects in pairs to calculate the strain value of NextHitObject from the strain value of CurrentHitObject and environment.
using (var hitObjectsEnumerator = objects.GetEnumerator())
// Preprocess the strains to find the maximum overall + individual (aggregate) strain from each section
var overall = skills.OfType<Overall>().Single();
var aggregatePeaks = new List<double>(Enumerable.Repeat(0.0, overall.StrainPeaks.Count));
foreach (var individual in skills.OfType<Individual>())
{
if (!hitObjectsEnumerator.MoveNext())
return false;
ManiaHitObjectDifficulty current = hitObjectsEnumerator.Current;
// First hitObject starts at strain 1. 1 is the default for strain values, so we don't need to set it here. See DifficultyHitObject.
while (hitObjectsEnumerator.MoveNext())
for (int i = 0; i < individual.StrainPeaks.Count; i++)
{
var next = hitObjectsEnumerator.Current;
next?.CalculateStrains(current, timeRate);
current = next;
double aggregate = individual.StrainPeaks[i] + overall.StrainPeaks[i];
if (aggregate > aggregatePeaks[i])
aggregatePeaks[i] = aggregate;
}
return true;
}
}
private double calculateDifficulty(List<ManiaHitObjectDifficulty> objects, double timeRate)
{
double actualStrainStep = strain_step * timeRate;
// Find the highest strain value within each strain step
List<double> highestStrains = new List<double>();
double intervalEndTime = actualStrainStep;
double maximumStrain = 0; // We need to keep track of the maximum strain in the current interval
ManiaHitObjectDifficulty previousHitObject = null;
foreach (var hitObject in objects)
{
// While we are beyond the current interval push the currently available maximum to our strain list
while (hitObject.BaseHitObject.StartTime > intervalEndTime)
{
highestStrains.Add(maximumStrain);
// The maximum strain of the next interval is not zero by default! We need to take the last hitObject we encountered, take its strain and apply the decay
// until the beginning of the next interval.
if (previousHitObject == null)
{
maximumStrain = 0;
}
else
{
double individualDecay = Math.Pow(ManiaHitObjectDifficulty.INDIVIDUAL_DECAY_BASE, (intervalEndTime - previousHitObject.BaseHitObject.StartTime) / 1000);
double overallDecay = Math.Pow(ManiaHitObjectDifficulty.OVERALL_DECAY_BASE, (intervalEndTime - previousHitObject.BaseHitObject.StartTime) / 1000);
maximumStrain = previousHitObject.IndividualStrain * individualDecay + previousHitObject.OverallStrain * overallDecay;
}
// Go to the next time interval
intervalEndTime += actualStrainStep;
}
// Obtain maximum strain
double strain = hitObject.IndividualStrain + hitObject.OverallStrain;
maximumStrain = Math.Max(strain, maximumStrain);
previousHitObject = hitObject;
}
// Build the weighted sum over the highest strains for each interval
aggregatePeaks.Sort((a, b) => b.CompareTo(a)); // Sort from highest to lowest strain.
double difficulty = 0;
double weight = 1;
highestStrains.Sort((a, b) => b.CompareTo(a)); // Sort from highest to lowest strain.
foreach (double strain in highestStrains)
// Difficulty is the weighted sum of the highest strains from every section.
foreach (double strain in aggregatePeaks)
{
difficulty += weight * strain;
weight *= decay_weight;
difficulty += strain * weight;
weight *= 0.9;
}
return difficulty;
}
protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate)
{
for (int i = 1; i < beatmap.HitObjects.Count; i++)
yield return new ManiaDifficultyHitObject(beatmap.HitObjects[i], beatmap.HitObjects[i - 1], clockRate);
}
protected override Skill[] CreateSkills(IBeatmap beatmap)
{
int columnCount = ((ManiaBeatmap)beatmap).TotalColumns;
var skills = new List<Skill> { new Overall(columnCount) };
for (int i = 0; i < columnCount; i++)
skills.Add(new Individual(i, columnCount));
return skills.ToArray();
}
protected override Mod[] DifficultyAdjustmentMods
{
get

19
osu.Game.Rulesets.Mania/Difficulty/Preprocessing/ManiaDifficultyHitObject.cs Normal file
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@ -0,0 +1,19 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Rulesets.Objects;
namespace osu.Game.Rulesets.Mania.Difficulty.Preprocessing
{
public class ManiaDifficultyHitObject : DifficultyHitObject
{
public new ManiaHitObject BaseObject => (ManiaHitObject)base.BaseObject;
public ManiaDifficultyHitObject(HitObject hitObject, HitObject lastObject, double clockRate)
: base(hitObject, lastObject, clockRate)
{
}
}
}

47
osu.Game.Rulesets.Mania/Difficulty/Skills/Individual.cs Normal file
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@ -0,0 +1,47 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System.Linq;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mania.Difficulty.Preprocessing;
using osu.Game.Rulesets.Mania.Objects;
namespace osu.Game.Rulesets.Mania.Difficulty.Skills
{
public class Individual : Skill
{
protected override double SkillMultiplier => 1;
protected override double StrainDecayBase => 0.125;
private readonly double[] holdEndTimes;
private readonly int column;
public Individual(int column, int columnCount)
{
this.column = column;
holdEndTimes = new double[columnCount];
}
protected override double StrainValueOf(DifficultyHitObject current)
{
var maniaCurrent = (ManiaDifficultyHitObject)current;
var endTime = (maniaCurrent.BaseObject as HoldNote)?.EndTime ?? maniaCurrent.BaseObject.StartTime;
try
{
if (maniaCurrent.BaseObject.Column != column)
return 0;
// We give a slight bonus if something is held meanwhile
return holdEndTimes.Any(t => t > endTime) ? 2.5 : 2;
}
finally
{
holdEndTimes[maniaCurrent.BaseObject.Column] = endTime;
}
}
}
}

56
osu.Game.Rulesets.Mania/Difficulty/Skills/Overall.cs Normal file
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@ -0,0 +1,56 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mania.Difficulty.Preprocessing;
using osu.Game.Rulesets.Mania.Objects;
namespace osu.Game.Rulesets.Mania.Difficulty.Skills
{
public class Overall : Skill
{
protected override double SkillMultiplier => 1;
protected override double StrainDecayBase => 0.3;
private readonly double[] holdEndTimes;
private readonly int columnCount;
public Overall(int columnCount)
{
this.columnCount = columnCount;
holdEndTimes = new double[columnCount];
}
protected override double StrainValueOf(DifficultyHitObject current)
{
var maniaCurrent = (ManiaDifficultyHitObject)current;
var endTime = (maniaCurrent.BaseObject as HoldNote)?.EndTime ?? maniaCurrent.BaseObject.StartTime;
double holdFactor = 1.0; // Factor in case something else is held
double holdAddition = 0; // Addition to the current note in case it's a hold and has to be released awkwardly
for (int i = 0; i < columnCount; i++)
{
// If there is at least one other overlapping end or note, then we get an addition, buuuuuut...
if (current.BaseObject.StartTime < holdEndTimes[i] && endTime > holdEndTimes[i])
holdAddition = 1.0;
// ... this addition only is valid if there is _no_ other note with the same ending.
// Releasing multiple notes at the same time is just as easy as releasing one
if (endTime == holdEndTimes[i])
holdAddition = 0;
// We give a slight bonus if something is held meanwhile
if (holdEndTimes[i] > endTime)
holdFactor = 1.25;
}
holdEndTimes[maniaCurrent.BaseObject.Column] = endTime;
return (1 + holdAddition) * holdFactor;
}
}
}

2
osu.Game.Rulesets.Mania/ManiaRuleset.cs
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@ -156,7 +156,7 @@ namespace osu.Game.Rulesets.Mania
public override Drawable CreateIcon() => new SpriteIcon { Icon = FontAwesome.fa_osu_mania_o };
public override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new ManiaDifficultyCalculator(this, beatmap);
public override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new ManiaDifficultyCalculator(this, beatmap);
public override int? LegacyID => 3;

112
osu.Game.Rulesets.Mania/Objects/ManiaHitObjectDifficulty.cs
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@ -1,112 +0,0 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Objects.Types;
using System;
namespace osu.Game.Rulesets.Mania.Objects
{
internal class ManiaHitObjectDifficulty
{
/// <summary>
/// Factor by how much individual / overall strain decays per second.
/// </summary>
/// <remarks>
/// These values are results of tweaking a lot and taking into account general feedback.
/// </remarks>
internal const double INDIVIDUAL_DECAY_BASE = 0.125;
internal const double OVERALL_DECAY_BASE = 0.30;
internal ManiaHitObject BaseHitObject;
private readonly int beatmapColumnCount;
private readonly double endTime;
private readonly double[] heldUntil;
/// <summary>
/// Measures jacks or more generally: repeated presses of the same button
/// </summary>
private readonly double[] individualStrains;
internal double IndividualStrain
{
get
{
return individualStrains[BaseHitObject.Column];
}
set
{
individualStrains[BaseHitObject.Column] = value;
}
}
/// <summary>
/// Measures note density in a way
/// </summary>
internal double OverallStrain = 1;
public ManiaHitObjectDifficulty(ManiaHitObject baseHitObject, int columnCount)
{
BaseHitObject = baseHitObject;
endTime = (baseHitObject as IHasEndTime)?.EndTime ?? baseHitObject.StartTime;
beatmapColumnCount = columnCount;
heldUntil = new double[beatmapColumnCount];
individualStrains = new double[beatmapColumnCount];
for (int i = 0; i < beatmapColumnCount; ++i)
{
individualStrains[i] = 0;
heldUntil[i] = 0;
}
}
internal void CalculateStrains(ManiaHitObjectDifficulty previousHitObject, double timeRate)
{
// TODO: Factor in holds
double timeElapsed = (BaseHitObject.StartTime - previousHitObject.BaseHitObject.StartTime) / timeRate;
double individualDecay = Math.Pow(INDIVIDUAL_DECAY_BASE, timeElapsed / 1000);
double overallDecay = Math.Pow(OVERALL_DECAY_BASE, timeElapsed / 1000);
double holdFactor = 1.0; // Factor to all additional strains in case something else is held
double holdAddition = 0; // Addition to the current note in case it's a hold and has to be released awkwardly
// Fill up the heldUntil array
for (int i = 0; i < beatmapColumnCount; ++i)
{
heldUntil[i] = previousHitObject.heldUntil[i];
// If there is at least one other overlapping end or note, then we get an addition, buuuuuut...
if (BaseHitObject.StartTime < heldUntil[i] && endTime > heldUntil[i])
{
holdAddition = 1.0;
}
// ... this addition only is valid if there is _no_ other note with the same ending. Releasing multiple notes at the same time is just as easy as releasing 1
if (endTime == heldUntil[i])
{
holdAddition = 0;
}
// We give a slight bonus to everything if something is held meanwhile
if (heldUntil[i] > endTime)
{
holdFactor = 1.25;
}
// Decay individual strains
individualStrains[i] = previousHitObject.individualStrains[i] * individualDecay;
}
heldUntil[BaseHitObject.Column] = endTime;
// Increase individual strain in own column
IndividualStrain += 2.0 * holdFactor;
OverallStrain = previousHitObject.OverallStrain * overallDecay + (1.0 + holdAddition) * holdFactor;
}
}
}

2
osu.Game.Rulesets.Osu.Tests/OsuDifficultyCalculatorTest.cs
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@ -18,7 +18,7 @@ namespace osu.Game.Rulesets.Osu.Tests
public void Test(double expected, string name)
=> base.Test(expected, name);
protected override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new OsuDifficultyCalculator(new OsuRuleset(), beatmap);
protected override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new OsuDifficultyCalculator(new OsuRuleset(), beatmap);
protected override Ruleset CreateRuleset() => new OsuRuleset();
}

6
osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyAttributes.cs
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@ -2,7 +2,6 @@
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Osu.Difficulty
{
@ -13,10 +12,5 @@ namespace osu.Game.Rulesets.Osu.Difficulty
public double ApproachRate;
public double OverallDifficulty;
public int MaxCombo;
public OsuDifficultyAttributes(Mod[] mods, double starRating)
: base(mods, starRating)
{
}
}
}

73
osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.cs
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@ -1,10 +1,13 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. 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.Beatmaps;
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Osu.Difficulty.Preprocessing;
using osu.Game.Rulesets.Osu.Difficulty.Skills;
@ -15,7 +18,6 @@ namespace osu.Game.Rulesets.Osu.Difficulty
{
public class OsuDifficultyCalculator : DifficultyCalculator
{
private const int section_length = 400;
private const double difficulty_multiplier = 0.0675;
public OsuDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
@ -23,58 +25,27 @@ namespace osu.Game.Rulesets.Osu.Difficulty
{
}
protected override DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double timeRate)
protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate)
{
if (!beatmap.HitObjects.Any())
return new OsuDifficultyAttributes(mods, 0);
OsuDifficultyBeatmap difficultyBeatmap = new OsuDifficultyBeatmap(beatmap.HitObjects.Cast<OsuHitObject>().ToList(), timeRate);
Skill[] skills =
{
new Aim(),
new Speed()
};
double sectionLength = section_length * timeRate;
// The first object doesn't generate a strain, so we begin with an incremented section end
double currentSectionEnd = Math.Ceiling(beatmap.HitObjects.First().StartTime / sectionLength) * sectionLength;
foreach (OsuDifficultyHitObject h in difficultyBeatmap)
{
while (h.BaseObject.StartTime > currentSectionEnd)
{
foreach (Skill s in skills)
{
s.SaveCurrentPeak();
s.StartNewSectionFrom(currentSectionEnd);
}
currentSectionEnd += sectionLength;
}
foreach (Skill s in skills)
s.Process(h);
}
// The peak strain will not be saved for the last section in the above loop
foreach (Skill s in skills)
s.SaveCurrentPeak();
if (beatmap.HitObjects.Count == 0)
return new OsuDifficultyAttributes { Mods = mods };
double aimRating = Math.Sqrt(skills[0].DifficultyValue()) * difficulty_multiplier;
double speedRating = Math.Sqrt(skills[1].DifficultyValue()) * difficulty_multiplier;
double starRating = aimRating + speedRating + Math.Abs(aimRating - speedRating) / 2;
// Todo: These int casts are temporary to achieve 1:1 results with osu!stable, and should be removed in the future
double hitWindowGreat = (int)(beatmap.HitObjects.First().HitWindows.Great / 2) / timeRate;
double preempt = (int)BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / timeRate;
double hitWindowGreat = (int)(beatmap.HitObjects.First().HitWindows.Great / 2) / clockRate;
double preempt = (int)BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
int maxCombo = beatmap.HitObjects.Count;
// Add the ticks + tail of the slider. 1 is subtracted because the head circle would be counted twice (once for the slider itself in the line above)
maxCombo += beatmap.HitObjects.OfType<Slider>().Sum(s => s.NestedHitObjects.Count - 1);
return new OsuDifficultyAttributes(mods, starRating)
return new OsuDifficultyAttributes
{
StarRating = starRating,
Mods = mods,
AimStrain = aimRating,
SpeedStrain = speedRating,
ApproachRate = preempt > 1200 ? (1800 - preempt) / 120 : (1200 - preempt) / 150 + 5,
@ -83,6 +54,26 @@ namespace osu.Game.Rulesets.Osu.Difficulty
};
}
protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate)
{
// The first jump is formed by the first two hitobjects of the map.
// If the map has less than two OsuHitObjects, the enumerator will not return anything.
for (int i = 1; i < beatmap.HitObjects.Count; i++)
{
var lastLast = i > 1 ? beatmap.HitObjects[i - 2] : null;
var last = beatmap.HitObjects[i - 1];
var current = beatmap.HitObjects[i];
yield return new OsuDifficultyHitObject(current, lastLast, last, clockRate);
}
}
protected override Skill[] CreateSkills(IBeatmap beatmap) => new Skill[]
{
new Aim(),
new Speed()
};
protected override Mod[] DifficultyAdjustmentMods => new Mod[]
{
new OsuModDoubleTime(),

50
osu.Game.Rulesets.Osu/Difficulty/Preprocessing/OsuDifficultyBeatmap.cs
View File

@ -1,50 +0,0 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using osu.Game.Rulesets.Osu.Objects;
namespace osu.Game.Rulesets.Osu.Difficulty.Preprocessing
{
/// <summary>
/// An enumerable container wrapping <see cref="OsuHitObject"/> input as <see cref="OsuDifficultyHitObject"/>
/// which contains extra data required for difficulty calculation.
/// </summary>
public class OsuDifficultyBeatmap : IEnumerable<OsuDifficultyHitObject>
{
private readonly IEnumerator<OsuDifficultyHitObject> difficultyObjects;
/// <summary>
/// Creates an enumerator, which preprocesses a list of <see cref="OsuHitObject"/>s recieved as input, wrapping them as
/// <see cref="OsuDifficultyHitObject"/> which contains extra data required for difficulty calculation.
/// </summary>
public OsuDifficultyBeatmap(List<OsuHitObject> objects, double timeRate)
{
// Sort OsuHitObjects by StartTime - they are not correctly ordered in some cases.
// This should probably happen before the objects reach the difficulty calculator.
difficultyObjects = createDifficultyObjectEnumerator(objects.OrderBy(h => h.StartTime).ToList(), timeRate);
}
/// <summary>
/// Returns an enumerator that enumerates all <see cref="OsuDifficultyHitObject"/>s in the <see cref="OsuDifficultyBeatmap"/>.
/// </summary>
public IEnumerator<OsuDifficultyHitObject> GetEnumerator() => difficultyObjects;
IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
private IEnumerator<OsuDifficultyHitObject> createDifficultyObjectEnumerator(List<OsuHitObject> objects, double timeRate)
{
// The first jump is formed by the first two hitobjects of the map.
// If the map has less than two OsuHitObjects, the enumerator will not return anything.
for (int i = 1; i < objects.Count; i++)
{
var lastLast = i > 1 ? objects[i - 2] : null;
var last = objects[i - 1];
var current = objects[i];
yield return new OsuDifficultyHitObject(lastLast, last, current, timeRate);
}
}
}
}

56
osu.Game.Rulesets.Osu/Difficulty/Preprocessing/OsuDifficultyHitObject.cs
View File

@ -1,24 +1,20 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. 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.Difficulty.Preprocessing;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Osu.Objects;
using osuTK;
namespace osu.Game.Rulesets.Osu.Difficulty.Preprocessing
{
/// <summary>
/// A wrapper around <see cref="OsuHitObject"/> extending it with additional data required for difficulty calculation.
/// </summary>
public class OsuDifficultyHitObject
public class OsuDifficultyHitObject : DifficultyHitObject
{
private const int normalized_radius = 52;
/// <summary>
/// The <see cref="OsuHitObject"/> this <see cref="OsuDifficultyHitObject"/> refers to.
/// </summary>
public OsuHitObject BaseObject { get; }
protected new OsuHitObject BaseObject => (OsuHitObject)base.BaseObject;
/// <summary>
/// Normalized distance from the end position of the previous <see cref="OsuDifficultyHitObject"/> to the start position of this <see cref="OsuDifficultyHitObject"/>.
@ -30,40 +26,30 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Preprocessing
/// </summary>
public double TravelDistance { get; private set; }
/// <summary>
/// Milliseconds elapsed since the StartTime of the previous <see cref="OsuDifficultyHitObject"/>.
/// </summary>
public double DeltaTime { get; private set; }
/// <summary>
/// Milliseconds elapsed since the start time of the previous <see cref="OsuDifficultyHitObject"/>, with a minimum of 50ms.
/// </summary>
public double StrainTime { get; private set; }
/// <summary>
/// Angle the player has to take to hit this <see cref="OsuDifficultyHitObject"/>.
/// Calculated as the angle between the circles (current-2, current-1, current).
/// </summary>
public double? Angle { get; private set; }
/// <summary>
/// Milliseconds elapsed since the start time of the previous <see cref="OsuDifficultyHitObject"/>, with a minimum of 50ms.
/// </summary>
public readonly double StrainTime;
private readonly OsuHitObject lastLastObject;
private readonly OsuHitObject lastObject;
private readonly double timeRate;
/// <summary>
/// Initializes the object calculating extra data required for difficulty calculation.
/// </summary>
public OsuDifficultyHitObject(OsuHitObject lastLastObject, OsuHitObject lastObject, OsuHitObject currentObject, double timeRate)
public OsuDifficultyHitObject(HitObject hitObject, HitObject lastLastObject, HitObject lastObject, double clockRate)
: base(hitObject, lastObject, clockRate)
{
this.lastLastObject = lastLastObject;
this.lastObject = lastObject;
this.timeRate = timeRate;
BaseObject = currentObject;
this.lastLastObject = (OsuHitObject)lastLastObject;
this.lastObject = (OsuHitObject)lastObject;
setDistances();
setTimingValues();
// Calculate angle here
// Every strain interval is hard capped at the equivalent of 375 BPM streaming speed as a safety measure
StrainTime = Math.Max(50, DeltaTime);
}
private void setDistances()
@ -102,14 +88,6 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Preprocessing
}
}
private void setTimingValues()
{
DeltaTime = (BaseObject.StartTime - lastObject.StartTime) / timeRate;
// Every strain interval is hard capped at the equivalent of 375 BPM streaming speed as a safety measure
StrainTime = Math.Max(50, DeltaTime);
}
private void computeSliderCursorPosition(Slider slider)
{
if (slider.LazyEndPosition != null)

38
osu.Game.Rulesets.Osu/Difficulty/Skills/Aim.cs
View File

@ -2,7 +2,10 @@
// 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.Osu.Difficulty.Preprocessing;
using osu.Game.Rulesets.Osu.Objects;
namespace osu.Game.Rulesets.Osu.Difficulty.Skills
{
@ -17,33 +20,40 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
protected override double SkillMultiplier => 26.25;
protected override double StrainDecayBase => 0.15;
protected override double StrainValueOf(OsuDifficultyHitObject current)
protected override double StrainValueOf(DifficultyHitObject current)
{
if (current.BaseObject is Spinner)
return 0;
var osuCurrent = (OsuDifficultyHitObject)current;
double result = 0;
const double scale = 90;
double applyDiminishingExp(double val) => Math.Pow(val, 0.99);
if (Previous.Count > 0)
{
if (current.Angle != null && current.Angle.Value > angle_bonus_begin)
var osuPrevious = (OsuDifficultyHitObject)Previous[0];
if (osuCurrent.Angle != null && osuCurrent.Angle.Value > angle_bonus_begin)
{
const double scale = 90;
var angleBonus = Math.Sqrt(
Math.Max(Previous[0].JumpDistance - scale, 0)
* Math.Pow(Math.Sin(current.Angle.Value - angle_bonus_begin), 2)
* Math.Max(current.JumpDistance - scale, 0));
result = 1.5 * applyDiminishingExp(Math.Max(0, angleBonus)) / Math.Max(timing_threshold, Previous[0].StrainTime);
Math.Max(osuPrevious.JumpDistance - scale, 0)
* Math.Pow(Math.Sin(osuCurrent.Angle.Value - angle_bonus_begin), 2)
* Math.Max(osuCurrent.JumpDistance - scale, 0));
result = 1.5 * applyDiminishingExp(Math.Max(0, angleBonus)) / Math.Max(timing_threshold, osuPrevious.StrainTime);
}
}
double jumpDistanceExp = applyDiminishingExp(current.JumpDistance);
double travelDistanceExp = applyDiminishingExp(current.TravelDistance);
double jumpDistanceExp = applyDiminishingExp(osuCurrent.JumpDistance);
double travelDistanceExp = applyDiminishingExp(osuCurrent.TravelDistance);
return Math.Max(
result + (jumpDistanceExp + travelDistanceExp + Math.Sqrt(travelDistanceExp * jumpDistanceExp)) / Math.Max(current.StrainTime, timing_threshold),
(Math.Sqrt(travelDistanceExp * jumpDistanceExp) + jumpDistanceExp + travelDistanceExp) / current.StrainTime
result + (jumpDistanceExp + travelDistanceExp + Math.Sqrt(travelDistanceExp * jumpDistanceExp)) / Math.Max(osuCurrent.StrainTime, timing_threshold),
(Math.Sqrt(travelDistanceExp * jumpDistanceExp) + jumpDistanceExp + travelDistanceExp) / osuCurrent.StrainTime
);
}
private double applyDiminishingExp(double val) => Math.Pow(val, 0.99);
}
}

26
osu.Game.Rulesets.Osu/Difficulty/Skills/Speed.cs
View File

@ -2,7 +2,10 @@
// 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.Osu.Difficulty.Preprocessing;
using osu.Game.Rulesets.Osu.Objects;
namespace osu.Game.Rulesets.Osu.Difficulty.Skills
{
@ -11,6 +14,8 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
/// </summary>
public class Speed : Skill
{
private const double single_spacing_threshold = 125;
private const double angle_bonus_begin = 5 * Math.PI / 6;
private const double pi_over_4 = Math.PI / 4;
private const double pi_over_2 = Math.PI / 2;
@ -22,9 +27,14 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
private const double max_speed_bonus = 45; // ~330BPM
private const double speed_balancing_factor = 40;
protected override double StrainValueOf(OsuDifficultyHitObject current)
protected override double StrainValueOf(DifficultyHitObject current)
{
double distance = Math.Min(SINGLE_SPACING_THRESHOLD, current.TravelDistance + current.JumpDistance);
if (current.BaseObject is Spinner)
return 0;
var osuCurrent = (OsuDifficultyHitObject)current;
double distance = Math.Min(single_spacing_threshold, osuCurrent.TravelDistance + osuCurrent.JumpDistance);
double deltaTime = Math.Max(max_speed_bonus, current.DeltaTime);
double speedBonus = 1.0;
@ -32,20 +42,20 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
speedBonus = 1 + Math.Pow((min_speed_bonus - deltaTime) / speed_balancing_factor, 2);
double angleBonus = 1.0;
if (current.Angle != null && current.Angle.Value < angle_bonus_begin)
if (osuCurrent.Angle != null && osuCurrent.Angle.Value < angle_bonus_begin)
{
angleBonus = 1 + Math.Pow(Math.Sin(1.5 * (angle_bonus_begin - current.Angle.Value)), 2) / 3.57;
if (current.Angle.Value < pi_over_2)
angleBonus = 1 + Math.Pow(Math.Sin(1.5 * (angle_bonus_begin - osuCurrent.Angle.Value)), 2) / 3.57;
if (osuCurrent.Angle.Value < pi_over_2)
{
angleBonus = 1.28;
if (distance < 90 && current.Angle.Value < pi_over_4)
if (distance < 90 && osuCurrent.Angle.Value < pi_over_4)
angleBonus += (1 - angleBonus) * Math.Min((90 - distance) / 10, 1);
else if (distance < 90)
angleBonus += (1 - angleBonus) * Math.Min((90 - distance) / 10, 1) * Math.Sin((pi_over_2 - current.Angle.Value) / pi_over_4);
angleBonus += (1 - angleBonus) * Math.Min((90 - distance) / 10, 1) * Math.Sin((pi_over_2 - osuCurrent.Angle.Value) / pi_over_4);
}
}
return (1 + (speedBonus - 1) * 0.75) * angleBonus * (0.95 + speedBonus * Math.Pow(distance / SINGLE_SPACING_THRESHOLD, 3.5)) / current.StrainTime;
return (1 + (speedBonus - 1) * 0.75) * angleBonus * (0.95 + speedBonus * Math.Pow(distance / single_spacing_threshold, 3.5)) / osuCurrent.StrainTime;
}
}
}

2
osu.Game.Rulesets.Osu/OsuRuleset.cs
View File

@ -133,7 +133,7 @@ namespace osu.Game.Rulesets.Osu
public override Drawable CreateIcon() => new SpriteIcon { Icon = FontAwesome.fa_osu_osu_o };
public override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new OsuDifficultyCalculator(this, beatmap);
public override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new OsuDifficultyCalculator(this, beatmap);
public override PerformanceCalculator CreatePerformanceCalculator(WorkingBeatmap beatmap, ScoreInfo score) => new OsuPerformanceCalculator(this, beatmap, score);

6
osu.Game.Rulesets.Taiko.Tests/TaikoDifficultyCalculatorTest.cs
View File

@ -13,12 +13,12 @@ namespace osu.Game.Rulesets.Taiko.Tests
{
protected override string ResourceAssembly => "osu.Game.Rulesets.Taiko";
[TestCase(2.9811336589467095, "diffcalc-test")]
[TestCase(2.9811336589467095, "diffcalc-test-strong")]
[TestCase(2.9811338051242915d, "diffcalc-test")]
[TestCase(2.9811338051242915d, "diffcalc-test-strong")]
public void Test(double expected, string name)
=> base.Test(expected, name);
protected override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new TaikoDifficultyCalculator(new TaikoRuleset(), beatmap);
protected override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new TaikoDifficultyCalculator(new TaikoRuleset(), beatmap);
protected override Ruleset CreateRuleset() => new TaikoRuleset();
}

20
osu.Game.Rulesets.Taiko/Difficulty/Preprocessing/TaikoDifficultyHitObject.cs Normal file
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@ -0,0 +1,20 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Taiko.Objects;
namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing
{
public class TaikoDifficultyHitObject : DifficultyHitObject
{
public readonly bool HasTypeChange;
public TaikoDifficultyHitObject(HitObject hitObject, HitObject lastObject, double clockRate)
: base(hitObject, lastObject, clockRate)
{
HasTypeChange = lastObject is RimHit != hitObject is RimHit;
}
}
}

95
osu.Game.Rulesets.Taiko/Difficulty/Skills/Strain.cs Normal file
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@ -0,0 +1,95 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. 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.Taiko.Difficulty.Preprocessing;
using osu.Game.Rulesets.Taiko.Objects;
namespace osu.Game.Rulesets.Taiko.Difficulty.Skills
{
public class Strain : Skill
{
private const double rhythm_change_base_threshold = 0.2;
private const double rhythm_change_base = 2.0;
protected override double SkillMultiplier => 1;
protected override double StrainDecayBase => 0.3;
private ColourSwitch lastColourSwitch = ColourSwitch.None;
private int sameColourCount = 1;
protected override double StrainValueOf(DifficultyHitObject current)
{
double addition = 1;
// We get an extra addition if we are not a slider or spinner
if (current.LastObject is Hit && current.BaseObject is Hit && current.DeltaTime < 1000)
{
if (hasColourChange(current))
addition += 0.75;
if (hasRhythmChange(current))
addition += 1;
}
else
{
lastColourSwitch = ColourSwitch.None;
sameColourCount = 1;
}
double additionFactor = 1;
// Scale the addition factor linearly from 0.4 to 1 for DeltaTime from 0 to 50
if (current.DeltaTime < 50)
additionFactor = 0.4 + 0.6 * current.DeltaTime / 50;
return additionFactor * addition;
}
private bool hasRhythmChange(DifficultyHitObject current)
{
// We don't want a division by zero if some random mapper decides to put two HitObjects at the same time.
if (current.DeltaTime == 0 || Previous.Count == 0 || Previous[0].DeltaTime == 0)
return false;
double timeElapsedRatio = Math.Max(Previous[0].DeltaTime / current.DeltaTime, current.DeltaTime / Previous[0].DeltaTime);
if (timeElapsedRatio >= 8)
return false;
double difference = Math.Log(timeElapsedRatio, rhythm_change_base) % 1.0;
return difference > rhythm_change_base_threshold && difference < 1 - rhythm_change_base_threshold;
}
private bool hasColourChange(DifficultyHitObject current)
{
var taikoCurrent = (TaikoDifficultyHitObject)current;
if (!taikoCurrent.HasTypeChange)
{
sameColourCount++;
return false;
}
var oldColourSwitch = lastColourSwitch;
var newColourSwitch = sameColourCount % 2 == 0 ? ColourSwitch.Even : ColourSwitch.Odd;
lastColourSwitch = newColourSwitch;
sameColourCount = 1;
// We only want a bonus if the parity of the color switch changes
return oldColourSwitch != ColourSwitch.None && oldColourSwitch != newColourSwitch;
}
private enum ColourSwitch
{
None,
Even,
Odd
}
}
}

6
osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyAttributes.cs
View File

@ -2,7 +2,6 @@
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Taiko.Difficulty
{
@ -10,10 +9,5 @@ namespace osu.Game.Rulesets.Taiko.Difficulty
{
public double GreatHitWindow;
public int MaxCombo;
public TaikoDifficultyAttributes(Mod[] mods, double starRating)
: base(mods, starRating)
{
}
}
}

124
osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs
View File

@ -1,137 +1,51 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. 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.Beatmaps;
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Taiko.Difficulty.Preprocessing;
using osu.Game.Rulesets.Taiko.Difficulty.Skills;
using osu.Game.Rulesets.Taiko.Mods;
using osu.Game.Rulesets.Taiko.Objects;
namespace osu.Game.Rulesets.Taiko.Difficulty
{
internal class TaikoDifficultyCalculator : DifficultyCalculator
public class TaikoDifficultyCalculator : DifficultyCalculator
{
private const double star_scaling_factor = 0.04125;
/// <summary>
/// In milliseconds. For difficulty calculation we will only look at the highest strain value in each time interval of size STRAIN_STEP.
/// This is to eliminate higher influence of stream over aim by simply having more HitObjects with high strain.
/// The higher this value, the less strains there will be, indirectly giving long beatmaps an advantage.
/// </summary>
private const double strain_step = 400;
/// <summary>
/// The weighting of each strain value decays to this number * it's previous value
/// </summary>
private const double decay_weight = 0.9;
public TaikoDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
: base(ruleset, beatmap)
{
}
protected override DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double timeRate)
protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate)
{
if (!beatmap.HitObjects.Any())
return new TaikoDifficultyAttributes(mods, 0);
if (beatmap.HitObjects.Count == 0)
return new TaikoDifficultyAttributes { Mods = mods };
var difficultyHitObjects = new List<TaikoHitObjectDifficulty>();
foreach (var hitObject in beatmap.HitObjects)
difficultyHitObjects.Add(new TaikoHitObjectDifficulty((TaikoHitObject)hitObject));
// Sort DifficultyHitObjects by StartTime of the HitObjects - just to make sure.
difficultyHitObjects.Sort((a, b) => a.BaseHitObject.StartTime.CompareTo(b.BaseHitObject.StartTime));
if (!calculateStrainValues(difficultyHitObjects, timeRate))
return new TaikoDifficultyAttributes(mods, 0);
double starRating = calculateDifficulty(difficultyHitObjects, timeRate) * star_scaling_factor;
return new TaikoDifficultyAttributes(mods, starRating)
return new TaikoDifficultyAttributes
{
// Todo: This int cast is temporary to achieve 1:1 results with osu!stable, and should be remoevd in the future
GreatHitWindow = (int)(beatmap.HitObjects.First().HitWindows.Great / 2) / timeRate,
MaxCombo = beatmap.HitObjects.Count(h => h is Hit)
StarRating = skills.Single().DifficultyValue() * star_scaling_factor,
Mods = mods,
// Todo: This int cast is temporary to achieve 1:1 results with osu!stable, and should be removed in the future
GreatHitWindow = (int)(beatmap.HitObjects.First().HitWindows.Great / 2) / clockRate,
MaxCombo = beatmap.HitObjects.Count(h => h is Hit),
};
}
private bool calculateStrainValues(List<TaikoHitObjectDifficulty> objects, double timeRate)
protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate)
{
// Traverse hitObjects in pairs to calculate the strain value of NextHitObject from the strain value of CurrentHitObject and environment.
using (var hitObjectsEnumerator = objects.GetEnumerator())
{
if (!hitObjectsEnumerator.MoveNext()) return false;
TaikoHitObjectDifficulty current = hitObjectsEnumerator.Current;
// First hitObject starts at strain 1. 1 is the default for strain values, so we don't need to set it here. See DifficultyHitObject.
while (hitObjectsEnumerator.MoveNext())
{
var next = hitObjectsEnumerator.Current;
next?.CalculateStrains(current, timeRate);
current = next;
}
return true;
}
for (int i = 1; i < beatmap.HitObjects.Count; i++)
yield return new TaikoDifficultyHitObject(beatmap.HitObjects[i], beatmap.HitObjects[i - 1], clockRate);
}
private double calculateDifficulty(List<TaikoHitObjectDifficulty> objects, double timeRate)
{
double actualStrainStep = strain_step * timeRate;
// Find the highest strain value within each strain step
List<double> highestStrains = new List<double>();
double intervalEndTime = actualStrainStep;
double maximumStrain = 0; // We need to keep track of the maximum strain in the current interval
TaikoHitObjectDifficulty previousHitObject = null;
foreach (var hitObject in objects)
{
// While we are beyond the current interval push the currently available maximum to our strain list
while (hitObject.BaseHitObject.StartTime > intervalEndTime)
{
highestStrains.Add(maximumStrain);
// The maximum strain of the next interval is not zero by default! We need to take the last hitObject we encountered, take its strain and apply the decay
// until the beginning of the next interval.
if (previousHitObject == null)
{
maximumStrain = 0;
}
else
{
double decay = Math.Pow(TaikoHitObjectDifficulty.DECAY_BASE, (intervalEndTime - previousHitObject.BaseHitObject.StartTime) / 1000);
maximumStrain = previousHitObject.Strain * decay;
}
// Go to the next time interval
intervalEndTime += actualStrainStep;
}
// Obtain maximum strain
maximumStrain = Math.Max(hitObject.Strain, maximumStrain);
previousHitObject = hitObject;
}
// Build the weighted sum over the highest strains for each interval
double difficulty = 0;
double weight = 1;
highestStrains.Sort((a, b) => b.CompareTo(a)); // Sort from highest to lowest strain.
foreach (double strain in highestStrains)
{
difficulty += weight * strain;
weight *= decay_weight;
}
return difficulty;
}
protected override Skill[] CreateSkills(IBeatmap beatmap) => new Skill[] { new Strain() };
protected override Mod[] DifficultyAdjustmentMods => new Mod[]
{

127
osu.Game.Rulesets.Taiko/Objects/TaikoHitObjectDifficulty.cs
View File

@ -1,127 +0,0 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
namespace osu.Game.Rulesets.Taiko.Objects
{
internal class TaikoHitObjectDifficulty
{
/// <summary>
/// Factor by how much individual / overall strain decays per second.
/// </summary>
/// <remarks>
/// These values are results of tweaking a lot and taking into account general feedback.
/// </remarks>
internal const double DECAY_BASE = 0.30;
private const double type_change_bonus = 0.75;
private const double rhythm_change_bonus = 1.0;
private const double rhythm_change_base_threshold = 0.2;
private const double rhythm_change_base = 2.0;
internal TaikoHitObject BaseHitObject;
/// <summary>
/// Measures note density in a way
/// </summary>
internal double Strain = 1;
private double timeElapsed;
private int sameTypeSince = 1;
private bool isRim => BaseHitObject is RimHit;
public TaikoHitObjectDifficulty(TaikoHitObject baseHitObject)
{
BaseHitObject = baseHitObject;
}
internal void CalculateStrains(TaikoHitObjectDifficulty previousHitObject, double timeRate)
{
// Rather simple, but more specialized things are inherently inaccurate due to the big difference playstyles and opinions make.
// See Taiko feedback thread.
timeElapsed = (BaseHitObject.StartTime - previousHitObject.BaseHitObject.StartTime) / timeRate;
double decay = Math.Pow(DECAY_BASE, timeElapsed / 1000);
double addition = 1;
// Only if we are no slider or spinner we get an extra addition
if (previousHitObject.BaseHitObject is Hit && BaseHitObject is Hit
&& BaseHitObject.StartTime - previousHitObject.BaseHitObject.StartTime < 1000) // And we only want to check out hitobjects which aren't so far in the past
{
addition += typeChangeAddition(previousHitObject);
addition += rhythmChangeAddition(previousHitObject);
}
double additionFactor = 1.0;
// Scale AdditionFactor linearly from 0.4 to 1 for TimeElapsed from 0 to 50
if (timeElapsed < 50.0)
additionFactor = 0.4 + 0.6 * timeElapsed / 50.0;
Strain = previousHitObject.Strain * decay + addition * additionFactor;
}
private TypeSwitch lastTypeSwitchEven = TypeSwitch.None;
private double typeChangeAddition(TaikoHitObjectDifficulty previousHitObject)
{
// If we don't have the same hit type, trigger a type change!
if (previousHitObject.isRim != isRim)
{
lastTypeSwitchEven = previousHitObject.sameTypeSince % 2 == 0 ? TypeSwitch.Even : TypeSwitch.Odd;
// We only want a bonus if the parity of the type switch changes!
switch (previousHitObject.lastTypeSwitchEven)
{
case TypeSwitch.Even:
if (lastTypeSwitchEven == TypeSwitch.Odd)
return type_change_bonus;
break;
case TypeSwitch.Odd:
if (lastTypeSwitchEven == TypeSwitch.Even)
return type_change_bonus;
break;
}
}
// No type change? Increment counter and keep track of last type switch
else
{
lastTypeSwitchEven = previousHitObject.lastTypeSwitchEven;
sameTypeSince = previousHitObject.sameTypeSince + 1;
}
return 0;
}
private double rhythmChangeAddition(TaikoHitObjectDifficulty previousHitObject)
{
// We don't want a division by zero if some random mapper decides to put 2 HitObjects at the same time.
if (timeElapsed == 0 || previousHitObject.timeElapsed == 0)
return 0;
double timeElapsedRatio = Math.Max(previousHitObject.timeElapsed / timeElapsed, timeElapsed / previousHitObject.timeElapsed);
if (timeElapsedRatio >= 8)
return 0;
double difference = Math.Log(timeElapsedRatio, rhythm_change_base) % 1.0;
if (isWithinChangeThreshold(difference))
return rhythm_change_bonus;
return 0;
}
private bool isWithinChangeThreshold(double value)
{
return value > rhythm_change_base_threshold && value < 1 - rhythm_change_base_threshold;
}
private enum TypeSwitch
{
None,
Even,
Odd
}
}
}

2
osu.Game.Rulesets.Taiko/TaikoRuleset.cs
View File

@ -110,7 +110,7 @@ namespace osu.Game.Rulesets.Taiko
public override Drawable CreateIcon() => new SpriteIcon { Icon = FontAwesome.fa_osu_taiko_o };
public override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new TaikoDifficultyCalculator(this, beatmap);
public override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => new TaikoDifficultyCalculator(this, beatmap);
public override PerformanceCalculator CreatePerformanceCalculator(WorkingBeatmap beatmap, ScoreInfo score) => new TaikoPerformanceCalculator(this, beatmap, score);

2
osu.Game.Rulesets.Taiko/osu.Game.Rulesets.Taiko.csproj
View File

@ -10,4 +10,4 @@
<ItemGroup Label="Project References">
<ProjectReference Include="..\osu.Game\osu.Game.csproj" />
</ItemGroup>
</Project>
</Project>

18
osu.Game.Tests/NonVisual/DifficultyAdjustmentModCombinationsTest.cs
View File

@ -15,7 +15,7 @@ namespace osu.Game.Tests.NonVisual
[Test]
public void TestNoMods()
{
var combinations = new TestDifficultyCalculator().CreateDifficultyAdjustmentModCombinations();
var combinations = new TestLegacyDifficultyCalculator().CreateDifficultyAdjustmentModCombinations();
Assert.AreEqual(1, combinations.Length);
Assert.IsTrue(combinations[0] is ModNoMod);
@ -24,7 +24,7 @@ namespace osu.Game.Tests.NonVisual
[Test]
public void TestSingleMod()
{
var combinations = new TestDifficultyCalculator(new ModA()).CreateDifficultyAdjustmentModCombinations();
var combinations = new TestLegacyDifficultyCalculator(new ModA()).CreateDifficultyAdjustmentModCombinations();
Assert.AreEqual(2, combinations.Length);
Assert.IsTrue(combinations[0] is ModNoMod);
@ -34,7 +34,7 @@ namespace osu.Game.Tests.NonVisual
[Test]
public void TestDoubleMod()
{
var combinations = new TestDifficultyCalculator(new ModA(), new ModB()).CreateDifficultyAdjustmentModCombinations();
var combinations = new TestLegacyDifficultyCalculator(new ModA(), new ModB()).CreateDifficultyAdjustmentModCombinations();
Assert.AreEqual(4, combinations.Length);
Assert.IsTrue(combinations[0] is ModNoMod);
@ -49,7 +49,7 @@ namespace osu.Game.Tests.NonVisual
[Test]
public void TestIncompatibleMods()
{
var combinations = new TestDifficultyCalculator(new ModA(), new ModIncompatibleWithA()).CreateDifficultyAdjustmentModCombinations();
var combinations = new TestLegacyDifficultyCalculator(new ModA(), new ModIncompatibleWithA()).CreateDifficultyAdjustmentModCombinations();
Assert.AreEqual(3, combinations.Length);
Assert.IsTrue(combinations[0] is ModNoMod);
@ -60,7 +60,7 @@ namespace osu.Game.Tests.NonVisual
[Test]
public void TestDoubleIncompatibleMods()
{
var combinations = new TestDifficultyCalculator(new ModA(), new ModB(), new ModIncompatibleWithA(), new ModIncompatibleWithAAndB()).CreateDifficultyAdjustmentModCombinations();
var combinations = new TestLegacyDifficultyCalculator(new ModA(), new ModB(), new ModIncompatibleWithA(), new ModIncompatibleWithAAndB()).CreateDifficultyAdjustmentModCombinations();
Assert.AreEqual(8, combinations.Length);
Assert.IsTrue(combinations[0] is ModNoMod);
@ -83,7 +83,7 @@ namespace osu.Game.Tests.NonVisual
[Test]
public void TestIncompatibleThroughBaseType()
{
var combinations = new TestDifficultyCalculator(new ModAofA(), new ModIncompatibleWithAofA()).CreateDifficultyAdjustmentModCombinations();
var combinations = new TestLegacyDifficultyCalculator(new ModAofA(), new ModIncompatibleWithAofA()).CreateDifficultyAdjustmentModCombinations();
Assert.AreEqual(3, combinations.Length);
Assert.IsTrue(combinations[0] is ModNoMod);
@ -136,9 +136,9 @@ namespace osu.Game.Tests.NonVisual
public override Type[] IncompatibleMods => new[] { typeof(ModA), typeof(ModB) };
}
private class TestDifficultyCalculator : DifficultyCalculator
private class TestLegacyDifficultyCalculator : LegacyDifficultyCalculator
{
public TestDifficultyCalculator(params Mod[] mods)
public TestLegacyDifficultyCalculator(params Mod[] mods)
: base(null, null)
{
DifficultyAdjustmentMods = mods;
@ -146,7 +146,7 @@ namespace osu.Game.Tests.NonVisual
protected override Mod[] DifficultyAdjustmentMods { get; }
protected override DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double timeRate) => throw new NotImplementedException();
protected override DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double clockRate) => throw new NotImplementedException();
}
}
}

115
osu.Game.Tests/NonVisual/LimitedCapacityStackTest.cs Normal file
View File

@ -0,0 +1,115 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
using NUnit.Framework;
using osu.Game.Rulesets.Difficulty.Utils;
namespace osu.Game.Tests.NonVisual
{
[TestFixture]
public class LimitedCapacityStackTest
{
private const int capacity = 3;
private LimitedCapacityStack<int> stack;
[SetUp]
public void Setup()
{
stack = new LimitedCapacityStack<int>(capacity);
}
[Test]
public void TestEmptyStack()
{
Assert.AreEqual(0, stack.Count);
Assert.Throws<IndexOutOfRangeException>(() =>
{
int unused = stack[0];
});
int count = 0;
foreach (var unused in stack)
count++;
Assert.AreEqual(0, count);
}
[TestCase(1)]
[TestCase(2)]
[TestCase(3)]
public void TestInRangeElements(int count)
{
// e.g. 0 -> 1 -> 2
for (int i = 0; i < count; i++)
stack.Push(i);
Assert.AreEqual(count, stack.Count);
// e.g. 2 -> 1 -> 0 (reverse order)
for (int i = 0; i < stack.Count; i++)
Assert.AreEqual(count - 1 - i, stack[i]);
// e.g. indices 3, 4, 5, 6 (out of range)
for (int i = stack.Count; i < stack.Count + capacity; i++)
{
Assert.Throws<IndexOutOfRangeException>(() =>
{
int unused = stack[i];
});
}
}
[TestCase(4)]
[TestCase(5)]
[TestCase(6)]
public void TestOverflowElements(int count)
{
// e.g. 0 -> 1 -> 2 -> 3
for (int i = 0; i < count; i++)
stack.Push(i);
Assert.AreEqual(capacity, stack.Count);
// e.g. 3 -> 2 -> 1 (reverse order)
for (int i = 0; i < stack.Count; i++)
Assert.AreEqual(count - 1 - i, stack[i]);
// e.g. indices 3, 4, 5, 6 (out of range)
for (int i = stack.Count; i < stack.Count + capacity; i++)
{
Assert.Throws<IndexOutOfRangeException>(() =>
{
int unused = stack[i];
});
}
}
[TestCase(1)]
[TestCase(2)]
[TestCase(3)]
[TestCase(4)]
[TestCase(5)]
[TestCase(6)]
public void TestEnumerator(int count)
{
// e.g. 0 -> 1 -> 2 -> 3
for (int i = 0; i < count; i++)
stack.Push(i);
int enumeratorCount = 0;
int expectedValue = count - 1;
foreach (var item in stack)
{
Assert.AreEqual(expectedValue, item);
enumeratorCount++;
expectedValue--;
}
Assert.AreEqual(stack.Count, enumeratorCount);
}
}
}

3
osu.Game.Tests/Visual/TestCaseMultiScreen.cs
View File

@ -4,7 +4,6 @@
using System;
using System.Collections.Generic;
using NUnit.Framework;
using osu.Framework.Screens;
using osu.Game.Screens.Multi;
using osu.Game.Screens.Multi.Lounge;
using osu.Game.Screens.Multi.Lounge.Components;
@ -26,8 +25,6 @@ namespace osu.Game.Tests.Visual
Multiplayer multi = new Multiplayer();
AddStep(@"show", () => LoadScreen(multi));
AddWaitStep(5);
AddStep(@"exit", multi.Exit);
}
}
}

2
osu.Game/Beatmaps/DummyWorkingBeatmap.cs
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@ -54,7 +54,7 @@ namespace osu.Game.Beatmaps
public override IBeatmapConverter CreateBeatmapConverter(IBeatmap beatmap) => new DummyBeatmapConverter { Beatmap = beatmap };
public override DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => null;
public override LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap) => null;
public override string Description => "dummy";

9
osu.Game/Rulesets/Difficulty/DifficultyAttributes.cs
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@ -7,8 +7,13 @@ namespace osu.Game.Rulesets.Difficulty
{
public class DifficultyAttributes
{
public readonly Mod[] Mods;
public readonly double StarRating;
public Mod[] Mods;
public double StarRating;
public DifficultyAttributes()
{
}
public DifficultyAttributes(Mod[] mods, double starRating)
{

97
osu.Game/Rulesets/Difficulty/DifficultyCalculator.cs
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@ -1,56 +1,64 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. 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.Framework.Extensions.IEnumerableExtensions;
using osu.Framework.Timing;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Difficulty
{
public abstract class DifficultyCalculator
public abstract class DifficultyCalculator : LegacyDifficultyCalculator
{
private readonly Ruleset ruleset;
private readonly WorkingBeatmap beatmap;
/// <summary>
/// The length of each strain section.
/// </summary>
protected virtual int SectionLength => 400;
protected DifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
: base(ruleset, beatmap)
{
this.ruleset = ruleset;
this.beatmap = beatmap;
}
/// <summary>
/// Calculates the difficulty of the beatmap using a specific mod combination.
/// </summary>
/// <param name="mods">The mods that should be applied to the beatmap.</param>
/// <returns>A structure describing the difficulty of the beatmap.</returns>
public DifficultyAttributes Calculate(params Mod[] mods)
protected override DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double clockRate)
{
beatmap.Mods.Value = mods;
IBeatmap playableBeatmap = beatmap.GetPlayableBeatmap(ruleset.RulesetInfo);
var skills = CreateSkills(beatmap);
var clock = new StopwatchClock();
mods.OfType<IApplicableToClock>().ForEach(m => m.ApplyToClock(clock));
if (!beatmap.HitObjects.Any())
return CreateDifficultyAttributes(beatmap, mods, skills, clockRate);
return Calculate(playableBeatmap, mods, clock.Rate);
}
var difficultyHitObjects = CreateDifficultyHitObjects(beatmap, clockRate).OrderBy(h => h.BaseObject.StartTime).ToList();
/// <summary>
/// Calculates the difficulty of the beatmap using all mod combinations applicable to the beatmap.
/// </summary>
/// <returns>A collection of structures describing the difficulty of the beatmap for each mod combination.</returns>
public IEnumerable<DifficultyAttributes> CalculateAll()
{
foreach (var combination in CreateDifficultyAdjustmentModCombinations())
double sectionLength = SectionLength * clockRate;
// The first object doesn't generate a strain, so we begin with an incremented section end
double currentSectionEnd = Math.Ceiling(beatmap.HitObjects.First().StartTime / sectionLength) * sectionLength;
foreach (DifficultyHitObject h in difficultyHitObjects)
{
if (combination is MultiMod multi)
yield return Calculate(multi.Mods);
else
yield return Calculate(combination);
while (h.BaseObject.StartTime > currentSectionEnd)
{
foreach (Skill s in skills)
{
s.SaveCurrentPeak();
s.StartNewSectionFrom(currentSectionEnd);
}
currentSectionEnd += sectionLength;
}
foreach (Skill s in skills)
s.Process(h);
}
// The peak strain will not be saved for the last section in the above loop
foreach (Skill s in skills)
s.SaveCurrentPeak();
return CreateDifficultyAttributes(beatmap, mods, skills, clockRate);
}
/// <summary>
@ -96,12 +104,27 @@ namespace osu.Game.Rulesets.Difficulty
protected virtual Mod[] DifficultyAdjustmentMods => Array.Empty<Mod>();
/// <summary>
/// Calculates the difficulty of a <see cref="Beatmap"/> using a specific <see cref="Mod"/> combination.
/// Creates <see cref="DifficultyAttributes"/> to describe beatmap's calculated difficulty.
/// </summary>
/// <param name="beatmap">The <see cref="IBeatmap"/> to compute the difficulty for.</param>
/// <param name="mods">The <see cref="Mod"/>s that should be applied.</param>
/// <param name="timeRate">The rate of time in <paramref name="beatmap"/>.</param>
/// <returns>A structure containing the difficulty attributes.</returns>
protected abstract DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double timeRate);
/// <param name="beatmap">The <see cref="IBeatmap"/> whose difficulty was calculated.</param>
/// <param name="mods">The <see cref="Mod"/>s that difficulty was calculated with.</param>
/// <param name="skills">The skills which processed the beatmap.</param>
/// <param name="clockRate">The rate at which the gameplay clock is run at.</param>
protected abstract DifficultyAttributes CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate);
/// <summary>
/// Enumerates <see cref="DifficultyHitObject"/>s to be processed from <see cref="HitObject"/>s in the <see cref="IBeatmap"/>.
/// </summary>
/// <param name="beatmap">The <see cref="IBeatmap"/> providing the <see cref="HitObject"/>s to enumerate.</param>
/// <param name="clockRate">The rate at which the gameplay clock is run at.</param>
/// <returns>The enumerated <see cref="DifficultyHitObject"/>s.</returns>
protected abstract IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate);
/// <summary>
/// Creates the <see cref="Skill"/>s to calculate the difficulty of an <see cref="IBeatmap"/>.
/// </summary>
/// <param name="beatmap">The <see cref="IBeatmap"/> whose difficulty will be calculated.</param
/// <returns>The <see cref="Skill"/>s.</returns>
protected abstract Skill[] CreateSkills(IBeatmap beatmap);
}
}

107
osu.Game/Rulesets/Difficulty/LegacyDifficultyCalculator.cs Normal file
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@ -0,0 +1,107 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. 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.Framework.Extensions.IEnumerableExtensions;
using osu.Framework.Timing;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Difficulty
{
public abstract class LegacyDifficultyCalculator
{
private readonly Ruleset ruleset;
private readonly WorkingBeatmap beatmap;
protected LegacyDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
{
this.ruleset = ruleset;
this.beatmap = beatmap;
}
/// <summary>
/// Calculates the difficulty of the beatmap using a specific mod combination.
/// </summary>
/// <param name="mods">The mods that should be applied to the beatmap.</param>
/// <returns>A structure describing the difficulty of the beatmap.</returns>
public DifficultyAttributes Calculate(params Mod[] mods)
{
beatmap.Mods.Value = mods;
IBeatmap playableBeatmap = beatmap.GetPlayableBeatmap(ruleset.RulesetInfo);
var clock = new StopwatchClock();
mods.OfType<IApplicableToClock>().ForEach(m => m.ApplyToClock(clock));
return Calculate(playableBeatmap, mods, clock.Rate);
}
/// <summary>
/// Calculates the difficulty of the beatmap using all mod combinations applicable to the beatmap.
/// </summary>
/// <returns>A collection of structures describing the difficulty of the beatmap for each mod combination.</returns>
public IEnumerable<DifficultyAttributes> CalculateAll()
{
foreach (var combination in CreateDifficultyAdjustmentModCombinations())
{
if (combination is MultiMod multi)
yield return Calculate(multi.Mods);
else
yield return Calculate(combination);
}
}
/// <summary>
/// Creates all <see cref="Mod"/> combinations which adjust the <see cref="Beatmap"/> difficulty.
/// </summary>
public Mod[] CreateDifficultyAdjustmentModCombinations()
{
return createDifficultyAdjustmentModCombinations(Enumerable.Empty<Mod>(), DifficultyAdjustmentMods).ToArray();
IEnumerable<Mod> createDifficultyAdjustmentModCombinations(IEnumerable<Mod> currentSet, Mod[] adjustmentSet, int currentSetCount = 0, int adjustmentSetStart = 0)
{
switch (currentSetCount)
{
case 0:
// Initial-case: Empty current set
yield return new ModNoMod();
break;
case 1:
yield return currentSet.Single();
break;
default:
yield return new MultiMod(currentSet.ToArray());
break;
}
// Apply mods in the adjustment set recursively. Using the entire adjustment set would result in duplicate multi-mod mod
// combinations in further recursions, so a moving subset is used to eliminate this effect
for (int i = adjustmentSetStart; i < adjustmentSet.Length; i++)
{
var adjustmentMod = adjustmentSet[i];
if (currentSet.Any(c => c.IncompatibleMods.Any(m => m.IsInstanceOfType(adjustmentMod))))
continue;
foreach (var combo in createDifficultyAdjustmentModCombinations(currentSet.Append(adjustmentMod), adjustmentSet, currentSetCount + 1, i + 1))
yield return combo;
}
}
}
/// <summary>
/// Retrieves all <see cref="Mod"/>s which adjust the <see cref="Beatmap"/> difficulty.
/// </summary>
protected virtual Mod[] DifficultyAdjustmentMods => Array.Empty<Mod>();
/// <summary>
/// Calculates the difficulty of a <see cref="Beatmap"/> using a specific <see cref="Mod"/> combination.
/// </summary>
/// <param name="beatmap">The <see cref="IBeatmap"/> to compute the difficulty for.</param>
/// <param name="mods">The <see cref="Mod"/>s that should be applied.</param>
/// <param name="clockRate">The rate at which the gameplay clock is run at.</param>
/// <returns>A structure containing the difficulty attributes.</returns>
protected abstract DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double clockRate);
}
}

41
osu.Game/Rulesets/Difficulty/Preprocessing/DifficultyHitObject.cs Normal file
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@ -0,0 +1,41 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using osu.Game.Rulesets.Objects;
namespace osu.Game.Rulesets.Difficulty.Preprocessing
{
/// <summary>
/// Wraps a <see cref="HitObject"/> and provides additional information to be used for difficulty calculation.
/// </summary>
public class DifficultyHitObject
{
/// <summary>
/// The <see cref="HitObject"/> this <see cref="DifficultyHitObject"/> wraps.
/// </summary>
public readonly HitObject BaseObject;
/// <summary>
/// The last <see cref="HitObject"/> which occurs before <see cref="BaseObject"/>.
/// </summary>
public readonly HitObject LastObject;
/// <summary>
/// Amount of time elapsed between <see cref="BaseObject"/> and <see cref="LastObject"/>.
/// </summary>
public readonly double DeltaTime;
/// <summary>
/// Creates a new <see cref="DifficultyHitObject"/>.
/// </summary>
/// <param name="hitObject">The <see cref="HitObject"/> which this <see cref="DifficultyHitObject"/> wraps.</param>
/// <param name="lastObject">The last <see cref="HitObject"/> which occurs before <paramref name="hitObject"/> in the beatmap.</param>
/// <param name="clockRate">The rate at which the gameplay clock is run at.</param>
public DifficultyHitObject(HitObject hitObject, HitObject lastObject, double clockRate)
{
BaseObject = hitObject;
LastObject = lastObject;
DeltaTime = (hitObject.StartTime - lastObject.StartTime) / clockRate;
}
}
}

42
osu.Game.Rulesets.Osu/Difficulty/Skills/Skill.cs → osu.Game/Rulesets/Difficulty/Skills/Skill.cs
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@ -3,20 +3,21 @@
using System;
using System.Collections.Generic;
using osu.Game.Rulesets.Osu.Difficulty.Preprocessing;
using osu.Game.Rulesets.Osu.Difficulty.Utils;
using osu.Game.Rulesets.Osu.Objects;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Utils;
namespace osu.Game.Rulesets.Osu.Difficulty.Skills
namespace osu.Game.Rulesets.Difficulty.Skills
{
/// <summary>
/// Used to processes strain values of <see cref="OsuDifficultyHitObject"/>s, keep track of strain levels caused by the processed objects
/// Used to processes strain values of <see cref="DifficultyHitObject"/>s, keep track of strain levels caused by the processed objects
/// and to calculate a final difficulty value representing the difficulty of hitting all the processed objects.
/// </summary>
public abstract class Skill
{
protected const double SINGLE_SPACING_THRESHOLD = 125;
protected const double STREAM_SPACING_THRESHOLD = 110;
/// <summary>
/// The peak strain for each <see cref="DifficultyCalculator.SectionLength"/> section of the beatmap.
/// </summary>
public IList<double> StrainPeaks => strainPeaks;
/// <summary>
/// Strain values are multiplied by this number for the given skill. Used to balance the value of different skills between each other.
@ -30,22 +31,27 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
protected abstract double StrainDecayBase { get; }
/// <summary>
/// <see cref="OsuDifficultyHitObject"/>s that were processed previously. They can affect the strain values of the following objects.
/// The weight by which each strain value decays.
/// </summary>
protected readonly History<OsuDifficultyHitObject> Previous = new History<OsuDifficultyHitObject>(2); // Contained objects not used yet
protected virtual double DecayWeight => 0.9;
/// <summary>
/// <see cref="DifficultyHitObject"/>s that were processed previously. They can affect the strain values of the following objects.
/// </summary>
protected readonly LimitedCapacityStack<DifficultyHitObject> Previous = new LimitedCapacityStack<DifficultyHitObject>(2); // Contained objects not used yet
private double currentStrain = 1; // We keep track of the strain level at all times throughout the beatmap.
private double currentSectionPeak = 1; // We also keep track of the peak strain level in the current section.
private readonly List<double> strainPeaks = new List<double>();
/// <summary>
/// Process an <see cref="OsuDifficultyHitObject"/> and update current strain values accordingly.
/// Process a <see cref="DifficultyHitObject"/> and update current strain values accordingly.
/// </summary>
public void Process(OsuDifficultyHitObject current)
public void Process(DifficultyHitObject current)
{
currentStrain *= strainDecay(current.DeltaTime);
if (!(current.BaseObject is Spinner))
currentStrain += StrainValueOf(current) * SkillMultiplier;
currentStrain += StrainValueOf(current) * SkillMultiplier;
currentSectionPeak = Math.Max(currentStrain, currentSectionPeak);
@ -64,7 +70,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
/// <summary>
/// Sets the initial strain level for a new section.
/// </summary>
/// <param name="offset">The beginning of the new section in milliseconds</param>
/// <param name="offset">The beginning of the new section in milliseconds.</param>
public void StartNewSectionFrom(double offset)
{
// The maximum strain of the new section is not zero by default, strain decays as usual regardless of section boundaries.
@ -74,7 +80,7 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
}
/// <summary>
/// Returns the calculated difficulty value representing all processed <see cref="OsuDifficultyHitObject"/>s.
/// Returns the calculated difficulty value representing all processed <see cref="DifficultyHitObject"/>s.
/// </summary>
public double DifficultyValue()
{
@ -87,16 +93,16 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Skills
foreach (double strain in strainPeaks)
{
difficulty += strain * weight;
weight *= 0.9;
weight *= DecayWeight;
}
return difficulty;
}
/// <summary>
/// Calculates the strain value of an <see cref="OsuDifficultyHitObject"/>. This value is affected by previously processed objects.
/// Calculates the strain value of a <see cref="DifficultyHitObject"/>. This value is affected by previously processed objects.
/// </summary>
protected abstract double StrainValueOf(OsuDifficultyHitObject current);
protected abstract double StrainValueOf(DifficultyHitObject current);
private double strainDecay(double ms) => Math.Pow(StrainDecayBase, ms / 1000);
}

26
osu.Game.Rulesets.Osu/Difficulty/Utils/History.cs → osu.Game/Rulesets/Difficulty/Utils/LimitedCapacityStack.cs
View File

@ -5,14 +5,16 @@ using System;
using System.Collections;
using System.Collections.Generic;
namespace osu.Game.Rulesets.Osu.Difficulty.Utils
namespace osu.Game.Rulesets.Difficulty.Utils
{
/// <summary>
/// An indexed stack with Push() only, which disposes items at the bottom after the capacity is full.
/// Indexing starts at the top of the stack.
/// An indexed stack with limited depth. Indexing starts at the top of the stack.
/// </summary>
public class History<T> : IEnumerable<T>
public class LimitedCapacityStack<T> : IEnumerable<T>
{
/// <summary>
/// The number of elements in the stack.
/// </summary>
public int Count { get; private set; }
private readonly T[] array;
@ -20,10 +22,10 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Utils
private int marker; // Marks the position of the most recently added item.
/// <summary>
/// Initializes a new instance of the History class that is empty and has the specified capacity.
/// Constructs a new <see cref="LimitedCapacityStack{T}"/>.
/// </summary>
/// <param name="capacity">The number of items the History can hold.</param>
public History(int capacity)
/// <param name="capacity">The number of items the stack can hold.</param>
public LimitedCapacityStack(int capacity)
{
if (capacity < 0)
throw new ArgumentOutOfRangeException();
@ -34,8 +36,9 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Utils
}
/// <summary>
/// The most recently added item is returned at index 0.
/// Retrieves the item at an index in the stack.
/// </summary>
/// <param name="i">The index of the item to retrieve. The top of the stack is returned at index 0.</param>
public T this[int i]
{
get
@ -52,11 +55,12 @@ namespace osu.Game.Rulesets.Osu.Difficulty.Utils
}
/// <summary>
/// Adds the item as the most recent one in the history.
/// The oldest item is disposed if the history is full.
/// Pushes an item to this <see cref="LimitedCapacityStack{T}"/>.
/// </summary>
public void Push(T item) // Overwrite the oldest item instead of shifting every item by one with every addition.
/// <param name="item">The item to push.</param>
public void Push(T item)
{
// Overwrite the oldest item instead of shifting every item by one with every addition.
if (marker == 0)
marker = capacity - 1;
else

2
osu.Game/Rulesets/Ruleset.cs
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@ -71,7 +71,7 @@ namespace osu.Game.Rulesets
/// <returns>The <see cref="IBeatmapProcessor"/>.</returns>
public virtual IBeatmapProcessor CreateBeatmapProcessor(IBeatmap beatmap) => null;
public abstract DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap);
public abstract LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap);
public virtual PerformanceCalculator CreatePerformanceCalculator(WorkingBeatmap beatmap, ScoreInfo score) => null;

2
osu.Game/Tests/Beatmaps/DifficultyCalculatorTest.cs
View File

@ -44,7 +44,7 @@ namespace osu.Game.Tests.Beatmaps
return Assembly.LoadFrom(Path.Combine(localPath, $"{ResourceAssembly}.dll")).GetManifestResourceStream($@"{ResourceAssembly}.Resources.{name}");
}
protected abstract DifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap);
protected abstract LegacyDifficultyCalculator CreateDifficultyCalculator(WorkingBeatmap beatmap);
protected abstract Ruleset CreateRuleset();
}