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Merge pull request #14352 from emu1337/strainskillchange

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Refactor StrainSkill for more strain extensibility
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Dan Balasescu 2021-08-17 14:05:13 +09:00 committed by GitHub
commit 7fb3ad6437
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 70 additions and 37 deletions
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2
osu.Game.Rulesets.Catch/Difficulty/Skills/Movement.cs
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@ -9,7 +9,7 @@ using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Catch.Difficulty.Skills
{
public class Movement : StrainSkill
public class Movement : StrainDecaySkill
{
private const float absolute_player_positioning_error = 16f;
private const float normalized_hitobject_radius = 41.0f;

4
osu.Game.Rulesets.Mania/Difficulty/Skills/Strain.cs
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@ -10,7 +10,7 @@ using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Mania.Difficulty.Skills
{
public class Strain : StrainSkill
public class Strain : StrainDecaySkill
{
private const double individual_decay_base = 0.125;
private const double overall_decay_base = 0.30;
@ -71,7 +71,7 @@ namespace osu.Game.Rulesets.Mania.Difficulty.Skills
return individualStrain + overallStrain - CurrentStrain;
}
protected override double GetPeakStrain(double offset)
protected override double CalculateInitialStrain(double offset)
=> applyDecay(individualStrain, offset - Previous[0].StartTime, individual_decay_base)
+ applyDecay(overallStrain, offset - Previous[0].StartTime, overall_decay_base);

2
osu.Game.Rulesets.Osu/Difficulty/Skills/OsuStrainSkill.cs
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@ -10,7 +10,7 @@ using osu.Framework.Utils;
namespace osu.Game.Rulesets.Osu.Difficulty.Skills
{
public abstract class OsuStrainSkill : StrainSkill
public abstract class OsuStrainSkill : StrainDecaySkill
{
/// <summary>
/// The number of sections with the highest strains, which the peak strain reductions will apply to.

2
osu.Game.Rulesets.Taiko/Difficulty/Skills/Colour.cs
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@ -14,7 +14,7 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Skills
/// <summary>
/// Calculates the colour coefficient of taiko difficulty.
/// </summary>
public class Colour : StrainSkill
public class Colour : StrainDecaySkill
{
protected override double SkillMultiplier => 1;
protected override double StrainDecayBase => 0.4;

2
osu.Game.Rulesets.Taiko/Difficulty/Skills/Rhythm.cs
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@ -14,7 +14,7 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Skills
/// <summary>
/// Calculates the rhythm coefficient of taiko difficulty.
/// </summary>
public class Rhythm : StrainSkill
public class Rhythm : StrainDecaySkill
{
protected override double SkillMultiplier => 10;
protected override double StrainDecayBase => 0;

2
osu.Game.Rulesets.Taiko/Difficulty/Skills/Stamina.cs
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@ -17,7 +17,7 @@ namespace osu.Game.Rulesets.Taiko.Difficulty.Skills
/// <remarks>
/// The reference play style chosen uses two hands, with full alternating (the hand changes after every hit).
/// </remarks>
public class Stamina : StrainSkill
public class Stamina : StrainDecaySkill
{
protected override double SkillMultiplier => 1;
protected override double StrainDecayBase => 0.4;

54
osu.Game/Rulesets/Difficulty/Skills/StrainDecaySkill.cs Normal file
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@ -0,0 +1,54 @@
// 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.Mods;
namespace osu.Game.Rulesets.Difficulty.Skills
{
/// <summary>
/// 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 StrainDecaySkill : StrainSkill
{
/// <summary>
/// Strain values are multiplied by this number for the given skill. Used to balance the value of different skills between each other.
/// </summary>
protected abstract double SkillMultiplier { get; }
/// <summary>
/// Determines how quickly strain decays for the given skill.
/// For example a value of 0.15 indicates that strain decays to 15% of its original value in one second.
/// </summary>
protected abstract double StrainDecayBase { get; }
/// <summary>
/// The current strain level.
/// </summary>
protected double CurrentStrain { get; private set; } = 1;
protected StrainDecaySkill(Mod[] mods)
: base(mods)
{
}
protected override double CalculateInitialStrain(double time) => CurrentStrain * strainDecay(time - Previous[0].StartTime);
protected override double StrainValueAt(DifficultyHitObject current)
{
CurrentStrain *= strainDecay(current.DeltaTime);
CurrentStrain += StrainValueOf(current) * SkillMultiplier;
return CurrentStrain;
}
/// <summary>
/// Calculates the strain value of a <see cref="DifficultyHitObject"/>. This value is affected by previously processed objects.
/// </summary>
protected abstract double StrainValueOf(DifficultyHitObject current);
private double strainDecay(double ms) => Math.Pow(StrainDecayBase, ms / 1000);
}
}

39
osu.Game/Rulesets/Difficulty/Skills/StrainSkill.cs
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@ -15,27 +15,11 @@ namespace osu.Game.Rulesets.Difficulty.Skills
/// </summary>
public abstract class StrainSkill : Skill
{
/// <summary>
/// Strain values are multiplied by this number for the given skill. Used to balance the value of different skills between each other.
/// </summary>
protected abstract double SkillMultiplier { get; }
/// <summary>
/// Determines how quickly strain decays for the given skill.
/// For example a value of 0.15 indicates that strain decays to 15% of its original value in one second.
/// </summary>
protected abstract double StrainDecayBase { get; }
/// <summary>
/// The weight by which each strain value decays.
/// </summary>
protected virtual double DecayWeight => 0.9;
/// <summary>
/// The current strain level.
/// </summary>
protected double CurrentStrain { get; private set; } = 1;
/// <summary>
/// The length of each strain section.
/// </summary>
@ -52,6 +36,11 @@ namespace osu.Game.Rulesets.Difficulty.Skills
{
}
/// <summary>
/// Returns the strain value at <see cref="DifficultyHitObject"/>. This value is calculated with or without respect to previous objects.
/// </summary>
protected abstract double StrainValueAt(DifficultyHitObject current);
/// <summary>
/// Process a <see cref="DifficultyHitObject"/> and update current strain values accordingly.
/// </summary>
@ -68,10 +57,7 @@ namespace osu.Game.Rulesets.Difficulty.Skills
currentSectionEnd += SectionLength;
}
CurrentStrain *= strainDecay(current.DeltaTime);
CurrentStrain += StrainValueOf(current) * SkillMultiplier;
currentSectionPeak = Math.Max(CurrentStrain, currentSectionPeak);
currentSectionPeak = Math.Max(StrainValueAt(current), currentSectionPeak);
}
/// <summary>
@ -88,9 +74,9 @@ namespace osu.Game.Rulesets.Difficulty.Skills
/// <param name="time">The beginning of the new section in milliseconds.</param>
private void startNewSectionFrom(double time)
{
// The maximum strain of the new section is not zero by default, strain decays as usual regardless of section boundaries.
// The maximum strain of the new section is not zero by default
// This means we need to capture the strain level at the beginning of the new section, and use that as the initial peak level.
currentSectionPeak = GetPeakStrain(time);
currentSectionPeak = CalculateInitialStrain(time);
}
/// <summary>
@ -98,7 +84,7 @@ namespace osu.Game.Rulesets.Difficulty.Skills
/// </summary>
/// <param name="time">The time to retrieve the peak strain at.</param>
/// <returns>The peak strain.</returns>
protected virtual double GetPeakStrain(double time) => CurrentStrain * strainDecay(time - Previous[0].StartTime);
protected abstract double CalculateInitialStrain(double time);
/// <summary>
/// Returns a live enumerable of the peak strains for each <see cref="SectionLength"/> section of the beatmap,
@ -124,12 +110,5 @@ namespace osu.Game.Rulesets.Difficulty.Skills
return difficulty;
}
/// <summary>
/// Calculates the strain value of a <see cref="DifficultyHitObject"/>. This value is affected by previously processed objects.
/// </summary>
protected abstract double StrainValueOf(DifficultyHitObject current);
private double strainDecay(double ms) => Math.Pow(StrainDecayBase, ms / 1000);
}
}