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added SoundEffectInstanceHandler

This commit is contained in:
Ell 2021-01-24 19:35:09 +01:00
parent d4bbe84ba1
commit 05543dfea8

View file

@ -1,3 +1,7 @@
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
@ -25,8 +29,6 @@ namespace MLEM.Misc {
/// </summary>
public float Pan;
private AudioEmitter emitter;
/// <summary>
/// Creates a new sound effect info with the given values.
/// </summary>
@ -49,33 +51,6 @@ namespace MLEM.Misc {
return this.Sound.Play(this.Volume, this.Pitch, this.Pan);
}
/// <summary>
/// Plays this info's <see cref="Sound"/> once, with 3d positioning applied, to the given <see cref="listener"/>.
/// The required <see cref="AudioEmitter"/> is automatically created and cached for future use.
/// </summary>
/// <param name="listener">Data about the listener</param>
/// <param name="pos">The position to play the sound at</param>
/// <param name="loop">Whether to loop the sound effect instance</param>
/// <param name="dopplerScale">The emitter's doppler scale, defaults to 1</param>
/// <param name="forward">The emitter's forward vector, defaults to <see cref="Vector3.Forward"/></param>
/// <param name="up">The emitter's up vector, defaults to <see cref="Vector3.Up"/></param>
/// <param name="velocity">The emitter's velocity, defaults to <see cref="Vector3.Zero"/></param>
public SoundEffectInstance Play3D(AudioListener listener, Vector3 pos, bool loop = false, float? dopplerScale = null, Vector3? forward = null, Vector3? up = null, Vector3? velocity = null) {
if (this.emitter == null)
this.emitter = new AudioEmitter();
this.emitter.Position = pos;
this.emitter.DopplerScale = dopplerScale ?? 1;
this.emitter.Forward = forward ?? Vector3.Forward;
this.emitter.Up = up ?? Vector3.Up;
this.emitter.Velocity = velocity ?? Vector3.Zero;
var inst = this.CreateInstance();
inst.IsLooped = loop;
inst.Apply3D(listener, this.emitter);
inst.Play();
return inst;
}
/// <summary>
/// Creates a new <see cref="SoundEffectInstance"/> with this sound effect info's data.
/// </summary>
@ -89,4 +64,99 @@ namespace MLEM.Misc {
}
}
/// <summary>
/// A simple class that handles automatically removing and disposing <see cref="SoundEffectInstance"/> objects once they are done playing to free up the audio source for new sounds.
/// Additionally, a callback can be registered that is invoked when the <see cref="SoundEffectInstance"/> finishes playing.
/// Note that an object of this class can be added to a <see cref="Game"/> using <see cref="GameComponentCollection.Add"/>.
/// </summary>
public class SoundEffectInstanceHandler : GameComponent, IEnumerable<SoundEffectInstance> {
private readonly List<Entry> playingSounds = new List<Entry>();
/// <summary>
/// Creates a new sound effect instance handler with the given settings
/// </summary>
/// <param name="game">The game instance</param>
public SoundEffectInstanceHandler(Game game) : base(game) {
}
/// <inheritdoc />
public override void Update(GameTime gameTime) {
this.Update();
}
/// <summary>
/// Updates this sound effect handler and manages all of the <see cref="SoundEffectInstance"/> objects in it.
/// This should be called each update frame.
/// </summary>
public void Update() {
for (var i = this.playingSounds.Count - 1; i >= 0; i--) {
var entry = this.playingSounds[i];
if (entry.Instance.IsDisposed || entry.Instance.State == SoundState.Stopped) {
entry.Instance.Stop(true);
entry.OnStopped?.Invoke(entry.Instance);
this.playingSounds.RemoveAt(i);
}
}
}
/// <summary>
/// Adds a new <see cref="SoundEffectInstance"/> to this handler.
/// This also starts playing the instance.
/// </summary>
/// <param name="instance">The instance to add</param>
/// <param name="onStopped">The function that should be invoked when this instance stops playing, defaults to null</param>
/// <returns>The passed instance, for chaining</returns>
public SoundEffectInstance Add(SoundEffectInstance instance, Action<SoundEffectInstance> onStopped = null) {
this.playingSounds.Add(new Entry(instance, onStopped));
instance.Play();
return instance;
}
/// <summary>
/// Adds a new <see cref="SoundEffectInfo"/> to this handler.
/// This also starts playing the created instance.
/// </summary>
/// <param name="info">The info for which to add a <see cref="SoundEffectInstance"/></param>
/// <param name="onStopped">The function that should be invoked when this instance stops playing, defaults to null</param>
/// <returns>The newly created <see cref="SoundEffectInstance"/></returns>
public SoundEffectInstance Add(SoundEffectInfo info, Action<SoundEffectInstance> onStopped = null) {
return this.Add(info.CreateInstance(), onStopped);
}
/// <summary>
/// Adds a new <see cref="SoundEffect"/> to this handler.
/// This also starts playing the created instance.
/// </summary>
/// <param name="effect">The sound for which to add a <see cref="SoundEffectInstance"/></param>
/// <param name="onStopped">The function that should be invoked when this instance stops playing, defaults to null</param>
/// <returns>The newly created <see cref="SoundEffectInstance"/></returns>
public SoundEffectInstance Add(SoundEffect effect, Action<SoundEffectInstance> onStopped = null) {
return this.Add(effect.CreateInstance(), onStopped);
}
/// <inheritdoc />
public IEnumerator<SoundEffectInstance> GetEnumerator() {
foreach (var sound in this.playingSounds)
yield return sound.Instance;
}
IEnumerator IEnumerable.GetEnumerator() {
return this.GetEnumerator();
}
private readonly struct Entry {
public readonly SoundEffectInstance Instance;
public readonly Action<SoundEffectInstance> OnStopped;
public Entry(SoundEffectInstance instance, Action<SoundEffectInstance> onStopped) {
this.Instance = instance;
this.OnStopped = onStopped;
}
}
}
}