Refactor more stuff (Audio mostly)

Zennysoft.Game.Godot.Implementation/Audio/DimmableAudioStreamPlayer.cs

@@ -0,0 +1,50 @@
+namespace Zennysoft.Game.Implementation;
+
+using Chickensoft.GodotNodeInterfaces;
+using Godot;
+using Zennysoft.Game.Abstractions;
+
+public partial class DimmableAudioStreamPlayer : AudioStreamPlayer, IDimmableAudioStreamPlayer
+{
+  #region Constants
+  // -60 to -80 is considered inaudible for decibels.
+  public const float VOLUME_DB_INAUDIBLE = -80f;
+  public const double FADE_DURATION = 3d; // seconds
+  #endregion Constants
+
+  public ITween? FadeTween { get; set; }
+
+  public float InitialVolumeDb;
+
+  public override void _Ready()
+  {
+    InitialVolumeDb = VolumeDb;
+    VolumeDb = VOLUME_DB_INAUDIBLE;
+  }
+
+  public void FadeIn()
+  {
+    SetupFade(InitialVolumeDb, Tween.EaseType.Out);
+    Play();
+  }
+
+  public void FadeOut()
+  {
+    SetupFade(VOLUME_DB_INAUDIBLE, Tween.EaseType.In);
+    FadeTween!.TweenCallback(Callable.From(Stop));
+  }
+
+  public void SetupFade(float volumeDb, Tween.EaseType ease)
+  {
+    FadeTween?.Kill();
+
+    FadeTween = GodotInterfaces.Adapt<ITween>(CreateTween());
+
+    FadeTween.TweenProperty(
+      this,
+      "volume_db",
+      volumeDb,
+      FADE_DURATION
+    ).SetTrans(Tween.TransitionType.Circ).SetEase(ease);
+  }
+}

Zennysoft.Game.Godot.Implementation/Zennysoft.Game.Implementation.csproj

@@ -7,6 +7,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
+		<PackageReference Include="Chickensoft.GodotNodeInterfaces" Version="2.4.0" />
 		<PackageReference Include="Chickensoft.Introspection" Version="2.2.0" />
 		<PackageReference Include="Chickensoft.Introspection.Generator" Version="2.2.0" />
 		<PackageReference Include="Chickensoft.Serialization.Godot" Version="0.7.6" />