Pp Refactoring: Merged multipliers that do the same thing

osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs

@@ -20,7 +20,7 @@ namespace osu.Game.Rulesets.Catch.Difficulty
 {
     public class CatchDifficultyCalculator : DifficultyCalculator
     {
-        private const double star_scaling_factor = 0.153;
+        private const double difficulty_multiplier = 4.59;
 
         private float halfCatcherWidth;
 
@@ -41,7 +41,7 @@ protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beat
 
             CatchDifficultyAttributes attributes = new CatchDifficultyAttributes
             {
-                StarRating = Math.Sqrt(skills[0].DifficultyValue()) * star_scaling_factor,
+                StarRating = Math.Sqrt(skills[0].DifficultyValue()) * difficulty_multiplier,
                 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)),

osu.Game.Rulesets.Catch/Difficulty/Skills/Movement.cs

@@ -15,7 +15,7 @@ public class Movement : StrainDecaySkill
         private const float normalized_hitobject_radius = 41.0f;
         private const double direction_change_bonus = 21.0;
 
-        protected override double SkillMultiplier => 900;
+        protected override double SkillMultiplier => 1;
         protected override double StrainDecayBase => 0.2;
 
         protected override double DecayWeight => 0.94;

osu.Game.Rulesets.Mania/Difficulty/ManiaDifficultyCalculator.cs

@@ -24,7 +24,7 @@ namespace osu.Game.Rulesets.Mania.Difficulty
 {
     public class ManiaDifficultyCalculator : DifficultyCalculator
     {
-        private const double star_scaling_factor = 0.018;
+        private const double difficulty_multiplier = 0.018;
 
         private readonly bool isForCurrentRuleset;
         private readonly double originalOverallDifficulty;
@@ -48,7 +48,7 @@ protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beat
 
             ManiaDifficultyAttributes attributes = new ManiaDifficultyAttributes
             {
-                StarRating = skills[0].DifficultyValue() * star_scaling_factor,
+                StarRating = skills[0].DifficultyValue() * difficulty_multiplier,
                 Mods = mods,
                 // In osu-stable mania, rate-adjustment mods don't affect the hit window.
                 // This is done the way it is to introduce fractional differences in order to match osu-stable for the time being.

osu.Game.Rulesets.Mania/Difficulty/ManiaPerformanceCalculator.cs

@@ -38,9 +38,7 @@ protected override PerformanceAttributes CreatePerformanceAttributes(ScoreInfo s
             countMiss = score.Statistics.GetValueOrDefault(HitResult.Miss);
             scoreAccuracy = calculateCustomAccuracy();
 
-            // Arbitrary initial value for scaling pp in order to standardize distributions across game modes.
-            // The specific number has no intrinsic meaning and can be adjusted as needed.
-            double multiplier = 8.0;
+            double multiplier = 1.0;
 
             if (score.Mods.Any(m => m is ModNoFail))
                 multiplier *= 0.75;
@@ -59,9 +57,9 @@ protected override PerformanceAttributes CreatePerformanceAttributes(ScoreInfo s
 
         private double computeDifficultyValue(ManiaDifficultyAttributes attributes)
         {
-            double difficultyValue = Math.Pow(Math.Max(attributes.StarRating - 0.15, 0.05), 2.2) // Star rating to pp curve
-                                     * Math.Max(0, 5 * scoreAccuracy - 4) // From 80% accuracy, 1/20th of total pp is awarded per additional 1% accuracy
-                                     * (1 + 0.1 * Math.Min(1, totalHits / 1500)); // Length bonus, capped at 1500 notes
+            double difficultyValue = 8.0 * Math.Pow(Math.Max(attributes.StarRating - 0.15, 0.05), 2.2) // Star rating to pp curve
+                                         * Math.Max(0, 5 * scoreAccuracy - 4) // From 80% accuracy, 1/20th of total pp is awarded per additional 1% accuracy
+                                         * (1 + 0.1 * Math.Min(1, totalHits / 1500)); // Length bonus, capped at 1500 notes
 
             return difficultyValue;
         }

osu.Game.Rulesets.Taiko/Difficulty/TaikoDifficultyCalculator.cs

@@ -21,12 +21,10 @@ namespace osu.Game.Rulesets.Taiko.Difficulty
 {
     public class TaikoDifficultyCalculator : DifficultyCalculator
     {
-        private const double difficulty_multiplier = 1.35;
-
-        private const double final_multiplier = 0.0625;
-        private const double rhythm_skill_multiplier = 0.2 * final_multiplier;
-        private const double colour_skill_multiplier = 0.375 * final_multiplier;
-        private const double stamina_skill_multiplier = 0.375 * final_multiplier;
+        private const double difficulty_multiplier = 0.084375;
+        private const double rhythm_skill_multiplier = 0.2 * difficulty_multiplier;
+        private const double colour_skill_multiplier = 0.375 * difficulty_multiplier;
+        private const double stamina_skill_multiplier = 0.375 * difficulty_multiplier;
 
         public override int Version => 20221107;
 
@@ -83,11 +81,11 @@ protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beat
             Rhythm rhythm = (Rhythm)skills.First(x => x is Rhythm);
             Stamina stamina = (Stamina)skills.First(x => x is Stamina);
 
-            double colourRating = colour.DifficultyValue() * colour_skill_multiplier * difficulty_multiplier;
-            double rhythmRating = rhythm.DifficultyValue() * rhythm_skill_multiplier * difficulty_multiplier;
-            double staminaRating = stamina.DifficultyValue() * stamina_skill_multiplier * difficulty_multiplier;
+            double colourRating = colour.DifficultyValue() * colour_skill_multiplier;
+            double rhythmRating = rhythm.DifficultyValue() * rhythm_skill_multiplier;
+            double staminaRating = stamina.DifficultyValue() * stamina_skill_multiplier;
 
-            double combinedRating = combinedDifficultyValue(rhythm, colour, stamina) * difficulty_multiplier;
+            double combinedRating = combinedDifficultyValue(rhythm, colour, stamina);
             double starRating = rescale(combinedRating * 1.4);
 
             HitWindows hitWindows = new TaikoHitWindows();