osu/osu.Game/Graphics/Containers/BeatSyncedContainer.cs

128 lines
4.4 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 osu.Framework.Allocation;
using osu.Framework.Audio.Track;
using osu.Framework.Bindables;
using osu.Framework.Graphics.Containers;
using osu.Game.Beatmaps;
using osu.Game.Beatmaps.ControlPoints;
namespace osu.Game.Graphics.Containers
{
public class BeatSyncedContainer : Container
{
protected readonly IBindable<WorkingBeatmap> Beatmap = new Bindable<WorkingBeatmap>();
private int lastBeat;
private TimingControlPoint lastTimingPoint;
/// <summary>
/// The amount of time before a beat we should fire <see cref="OnNewBeat(int, TimingControlPoint, EffectControlPoint, TrackAmplitudes)"/>.
/// This allows for adding easing to animations that may be synchronised to the beat.
/// </summary>
protected double EarlyActivationMilliseconds;
/// <summary>
/// The time in milliseconds until the next beat.
/// </summary>
public double TimeUntilNextBeat { get; private set; }
/// <summary>
/// The time in milliseconds since the last beat
/// </summary>
public double TimeSinceLastBeat { get; private set; }
/// <summary>
/// Default length of a beat in milliseconds. Used whenever there is no beatmap or track playing.
/// </summary>
private const double default_beat_length = 60000.0 / 60.0;
private TimingControlPoint defaultTiming;
private EffectControlPoint defaultEffect;
private TrackAmplitudes defaultAmplitudes;
protected override void Update()
{
Track track = null;
IBeatmap beatmap = null;
double currentTrackTime;
TimingControlPoint timingPoint;
EffectControlPoint effectPoint;
if (Beatmap.Value.TrackLoaded && Beatmap.Value.BeatmapLoaded)
{
track = Beatmap.Value.Track;
beatmap = Beatmap.Value.Beatmap;
}
if (track != null && beatmap != null && track.IsRunning)
{
currentTrackTime = track.Length > 0 ? track.CurrentTime + EarlyActivationMilliseconds : Clock.CurrentTime;
timingPoint = beatmap.ControlPointInfo.TimingPointAt(currentTrackTime);
effectPoint = beatmap.ControlPointInfo.EffectPointAt(currentTrackTime);
if (timingPoint.BeatLength == 0)
return;
}
else
{
currentTrackTime = Clock.CurrentTime;
timingPoint = defaultTiming;
effectPoint = defaultEffect;
}
int beatIndex = (int)((currentTrackTime - timingPoint.Time) / timingPoint.BeatLength);
// The beats before the start of the first control point are off by 1, this should do the trick
if (currentTrackTime < timingPoint.Time)
beatIndex--;
TimeUntilNextBeat = (timingPoint.Time - currentTrackTime) % timingPoint.BeatLength;
if (TimeUntilNextBeat < 0)
TimeUntilNextBeat += timingPoint.BeatLength;
TimeSinceLastBeat = timingPoint.BeatLength - TimeUntilNextBeat;
if (timingPoint.Equals(lastTimingPoint) && beatIndex == lastBeat)
return;
using (BeginDelayedSequence(-TimeSinceLastBeat, true))
OnNewBeat(beatIndex, timingPoint, effectPoint, track?.CurrentAmplitudes ?? defaultAmplitudes);
lastBeat = beatIndex;
lastTimingPoint = timingPoint;
}
[BackgroundDependencyLoader]
private void load(IBindable<WorkingBeatmap> beatmap)
{
Beatmap.BindTo(beatmap);
defaultTiming = new TimingControlPoint
{
BeatLength = default_beat_length,
};
defaultEffect = new EffectControlPoint
{
KiaiMode = false,
OmitFirstBarLine = false
};
defaultAmplitudes = new TrackAmplitudes
{
FrequencyAmplitudes = new float[256],
LeftChannel = 0,
RightChannel = 0
};
}
protected virtual void OnNewBeat(int beatIndex, TimingControlPoint timingPoint, EffectControlPoint effectPoint, TrackAmplitudes amplitudes)
{
}
}
}