osu/osu.Game.Rulesets.Osu/Difficulty/OsuPerformanceCalculator.cs

210 lines
8.6 KiB
C#

// 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.Osu.Mods;
using osu.Game.Rulesets.Osu.Objects;
using osu.Game.Rulesets.Scoring;
using osu.Game.Scoring;
namespace osu.Game.Rulesets.Osu.Difficulty
{
public class OsuPerformanceCalculator : PerformanceCalculator
{
public new OsuDifficultyAttributes Attributes => (OsuDifficultyAttributes)base.Attributes;
private readonly int countHitCircles;
private readonly int beatmapMaxCombo;
private Mod[] mods;
private double accuracy;
private int scoreMaxCombo;
private int countGreat;
private int countGood;
private int countMeh;
private int countMiss;
public OsuPerformanceCalculator(Ruleset ruleset, WorkingBeatmap beatmap, ScoreInfo score)
: base(ruleset, beatmap, score)
{
countHitCircles = Beatmap.HitObjects.Count(h => h is HitCircle);
beatmapMaxCombo = Beatmap.HitObjects.Count;
// Add the ticks + tail of the slider. 1 is subtracted because the "headcircle" would be counted twice (once for the slider itself in the line above)
beatmapMaxCombo += Beatmap.HitObjects.OfType<Slider>().Sum(s => s.NestedHitObjects.Count - 1);
}
public override double Calculate(Dictionary<string, double> categoryRatings = null)
{
mods = Score.Mods;
accuracy = Score.Accuracy;
scoreMaxCombo = Score.MaxCombo;
countGreat = Score.Statistics[HitResult.Great];
countGood = Score.Statistics[HitResult.Good];
countMeh = Score.Statistics[HitResult.Meh];
countMiss = Score.Statistics[HitResult.Miss];
// Don't count scores made with supposedly unranked mods
if (mods.Any(m => !m.Ranked))
return 0;
// Custom multipliers for NoFail and SpunOut.
double multiplier = 1.12; // This is being adjusted to keep the final pp value scaled around what it used to be when changing things
if (mods.Any(m => m is OsuModNoFail))
multiplier *= 0.90;
if (mods.Any(m => m is OsuModSpunOut))
multiplier *= 0.95;
double aimValue = computeAimValue();
double speedValue = computeSpeedValue();
double accuracyValue = computeAccuracyValue();
double totalValue =
Math.Pow(
Math.Pow(aimValue, 1.1) +
Math.Pow(speedValue, 1.1) +
Math.Pow(accuracyValue, 1.1), 1.0 / 1.1
) * multiplier;
if (categoryRatings != null)
{
categoryRatings.Add("Aim", aimValue);
categoryRatings.Add("Speed", speedValue);
categoryRatings.Add("Accuracy", accuracyValue);
categoryRatings.Add("OD", Attributes.OverallDifficulty);
categoryRatings.Add("AR", Attributes.ApproachRate);
categoryRatings.Add("Max Combo", beatmapMaxCombo);
}
return totalValue;
}
private double computeAimValue()
{
double rawAim = Attributes.AimStrain;
if (mods.Any(m => m is OsuModTouchDevice))
rawAim = Math.Pow(rawAim, 0.8);
double aimValue = Math.Pow(5.0 * Math.Max(1.0, rawAim / 0.0675) - 4.0, 3.0) / 100000.0;
// Longer maps are worth more
double lengthBonus = 0.95 + 0.4 * Math.Min(1.0, totalHits / 2000.0) +
(totalHits > 2000 ? Math.Log10(totalHits / 2000.0) * 0.5 : 0.0);
aimValue *= lengthBonus;
// Penalize misses exponentially. This mainly fixes tag4 maps and the likes until a per-hitobject solution is available
aimValue *= Math.Pow(0.97, countMiss);
// Combo scaling
if (beatmapMaxCombo > 0)
aimValue *= Math.Min(Math.Pow(scoreMaxCombo, 0.8) / Math.Pow(beatmapMaxCombo, 0.8), 1.0);
double approachRateFactor = 1.0;
if (Attributes.ApproachRate > 10.33)
approachRateFactor += 0.3 * (Attributes.ApproachRate - 10.33);
else if (Attributes.ApproachRate < 8.0)
{
approachRateFactor += 0.01 * (8.0 - Attributes.ApproachRate);
}
aimValue *= approachRateFactor;
// We want to give more reward for lower AR when it comes to aim and HD. This nerfs high AR and buffs lower AR.
if (mods.Any(h => h is OsuModHidden))
aimValue *= 1.0 + 0.04 * (12.0 - Attributes.ApproachRate);
if (mods.Any(h => h is OsuModFlashlight))
{
// Apply object-based bonus for flashlight.
aimValue *= 1.0 + 0.35 * Math.Min(1.0, totalHits / 200.0) +
(totalHits > 200
? 0.3 * Math.Min(1.0, (totalHits - 200) / 300.0) +
(totalHits > 500 ? (totalHits - 500) / 1200.0 : 0.0)
: 0.0);
}
// Scale the aim value with accuracy _slightly_
aimValue *= 0.5 + accuracy / 2.0;
// It is important to also consider accuracy difficulty when doing that
aimValue *= 0.98 + Math.Pow(Attributes.OverallDifficulty, 2) / 2500;
return aimValue;
}
private double computeSpeedValue()
{
double speedValue = Math.Pow(5.0 * Math.Max(1.0, Attributes.SpeedStrain / 0.0675) - 4.0, 3.0) / 100000.0;
// Longer maps are worth more
speedValue *= 0.95 + 0.4 * Math.Min(1.0, totalHits / 2000.0) +
(totalHits > 2000 ? Math.Log10(totalHits / 2000.0) * 0.5 : 0.0);
// Penalize misses exponentially. This mainly fixes tag4 maps and the likes until a per-hitobject solution is available
speedValue *= Math.Pow(0.97, countMiss);
// Combo scaling
if (beatmapMaxCombo > 0)
speedValue *= Math.Min(Math.Pow(scoreMaxCombo, 0.8) / Math.Pow(beatmapMaxCombo, 0.8), 1.0);
double approachRateFactor = 1.0;
if (Attributes.ApproachRate > 10.33)
approachRateFactor += 0.3 * (Attributes.ApproachRate - 10.33);
speedValue *= approachRateFactor;
if (mods.Any(m => m is OsuModHidden))
speedValue *= 1.0 + 0.04 * (12.0 - Attributes.ApproachRate);
// Scale the speed value with accuracy _slightly_
speedValue *= 0.02 + accuracy;
// It is important to also consider accuracy difficulty when doing that
speedValue *= 0.96 + Math.Pow(Attributes.OverallDifficulty, 2) / 1600;
return speedValue;
}
private double computeAccuracyValue()
{
// This percentage only considers HitCircles of any value - in this part of the calculation we focus on hitting the timing hit window
double betterAccuracyPercentage;
int amountHitObjectsWithAccuracy = countHitCircles;
if (amountHitObjectsWithAccuracy > 0)
betterAccuracyPercentage = ((countGreat - (totalHits - amountHitObjectsWithAccuracy)) * 6 + countGood * 2 + countMeh) / (amountHitObjectsWithAccuracy * 6);
else
betterAccuracyPercentage = 0;
// It is possible to reach a negative accuracy with this formula. Cap it at zero - zero points
if (betterAccuracyPercentage < 0)
betterAccuracyPercentage = 0;
// Lots of arbitrary values from testing.
// Considering to use derivation from perfect accuracy in a probabilistic manner - assume normal distribution
double accuracyValue = Math.Pow(1.52163, Attributes.OverallDifficulty) * Math.Pow(betterAccuracyPercentage, 24) * 2.83;
// Bonus for many hitcircles - it's harder to keep good accuracy up for longer
accuracyValue *= Math.Min(1.15, Math.Pow(amountHitObjectsWithAccuracy / 1000.0, 0.3));
if (mods.Any(m => m is OsuModHidden))
accuracyValue *= 1.08;
if (mods.Any(m => m is OsuModFlashlight))
accuracyValue *= 1.02;
return accuracyValue;
}
private double totalHits => countGreat + countGood + countMeh + countMiss;
private double totalSuccessfulHits => countGreat + countGood + countMeh;
}
}