mirror of https://github.com/ppy/osu
85 lines
3.1 KiB
C#
85 lines
3.1 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using osu.Framework.Audio;
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using osu.Framework.Bindables;
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namespace osu.Game.Rulesets.Mods
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{
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/// <summary>
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/// Provides common functionality shared across various rate adjust mods.
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/// </summary>
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public class RateAdjustModHelper : IApplicableToTrack
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{
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public readonly IBindableNumber<double> SpeedChange;
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private IAdjustableAudioComponent? track;
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private BindableBool? adjustPitch;
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/// <summary>
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/// The score multiplier for the current <see cref="SpeedChange"/>.
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/// </summary>
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public double ScoreMultiplier
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{
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get
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{
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// Round to the nearest multiple of 0.1.
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double value = (int)(SpeedChange.Value * 10) / 10.0;
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// Offset back to 0.
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value -= 1;
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if (SpeedChange.Value >= 1)
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return 1 + value / 5;
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else
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return 0.6 + value;
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}
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}
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/// <summary>
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/// Construct a new <see cref="RateAdjustModHelper"/>.
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/// </summary>
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/// <param name="speedChange">The main speed adjust parameter which is exposed to the user.</param>
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public RateAdjustModHelper(IBindableNumber<double> speedChange)
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{
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SpeedChange = speedChange;
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}
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/// <summary>
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/// Setup audio track adjustments for a rate adjust mod.
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/// Importantly, <see cref="ApplyToTrack"/> must be called when a track is obtained/changed for this to work.
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/// </summary>
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/// <param name="adjustPitch">The "adjust pitch" setting as exposed to the user.</param>
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public void HandleAudioAdjustments(BindableBool adjustPitch)
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{
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this.adjustPitch = adjustPitch;
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// When switching between pitch adjust, we need to update adjustments to time-shift or frequency-scale.
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adjustPitch.BindValueChanged(adjustPitchSetting =>
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{
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track?.RemoveAdjustment(adjustmentForPitchSetting(adjustPitchSetting.OldValue), SpeedChange);
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track?.AddAdjustment(adjustmentForPitchSetting(adjustPitchSetting.NewValue), SpeedChange);
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AdjustableProperty adjustmentForPitchSetting(bool adjustPitchSettingValue)
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=> adjustPitchSettingValue ? AdjustableProperty.Frequency : AdjustableProperty.Tempo;
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});
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}
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/// <summary>
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/// Should be invoked when a track is obtained / changed.
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/// </summary>
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/// <param name="track">The new track.</param>
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/// <exception cref="InvalidOperationException">If this method is called before <see cref="HandleAudioAdjustments"/>.</exception>
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public void ApplyToTrack(IAdjustableAudioComponent track)
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{
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if (adjustPitch == null)
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throw new InvalidOperationException($"Must call {nameof(HandleAudioAdjustments)} first");
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this.track = track;
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adjustPitch.TriggerChange();
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}
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}
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}
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