91 lines
2.2 KiB
C#
91 lines
2.2 KiB
C#
using Sandbox;
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using Sandbox.Audio;
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using System.Threading;
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using System.Threading.Tasks;
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namespace Sandbox;
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public sealed class DSPReverb : Component, Component.ITriggerListener
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{
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[Property] public MixerHandle TargetMixer { get; set; }
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[Property] public DspPresetHandle Preset { get; set; }
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[Property] [Range(0f, 10f, 0.1f)] public float FadeDuration { get; set; } = 1f;
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[Property] public BBox Bounds { get; set; } = new BBox(Vector3.One * -100f, Vector3.One * 100f);
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private DspProcessor _processor;
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private BoxCollider _triggerCollider;
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private CancellationTokenSource _cts;
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protected override void OnAwake()
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{
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base.OnAwake();
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_triggerCollider = Components.Create<BoxCollider>();
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_triggerCollider.IsTrigger = true;
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_triggerCollider.Static = true;
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_triggerCollider.Scale = Bounds.Size;
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_triggerCollider.Center = Bounds.Center;
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}
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public void OnTriggerEnter(Collider other)
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{
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_cts?.Cancel();
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_cts = new CancellationTokenSource();
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if(_processor != null) { TargetMixer.Get().RemoveProcessor(_processor);}
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_processor = new DspProcessor(Preset.Name);
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_processor.Mix = 0f;
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TargetMixer.Get().AddProcessor(_processor);
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_ = UpdateMixAsync(1f);
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}
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private async Task UpdateMixAsync(float targetMix)
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{
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float startMix = _processor.Mix;
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float elapsed = FadeDuration * ((targetMix == 0f || startMix == 0f) ? 0f : Math.Min(startMix / targetMix, 1f));
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float lastTime = Time.Now;
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while (elapsed < FadeDuration && !_cts.IsCancellationRequested)
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{
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await Task.FixedUpdate();
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float delta = Time.Now - lastTime;
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elapsed += delta;
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float t = Math.Clamp(elapsed / FadeDuration, 0f, 1f);
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_processor.Mix = Math.Clamp(startMix + (targetMix - startMix) * t, 0f, 1f);
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lastTime = Time.Now;
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}
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if (!_cts.IsCancellationRequested)
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{
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_processor.Mix = targetMix;
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}
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}
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public void OnTriggerExit(Collider other)
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{
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_cts?.Cancel();
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_cts = new CancellationTokenSource();
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_ = UpdateMixAsync(0f).ContinueWith( (_) =>
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{
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if (_processor == null) return;
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TargetMixer.Get().RemoveProcessor(_processor);
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_processor = null;
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} );
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}
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protected override void DrawGizmos()
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{
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base.DrawGizmos();
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Gizmo.Draw.Color = Color.Green;
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Gizmo.Draw.LineBBox(Bounds);
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}
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}
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