Store ambient sound entities on a component tree. (#13110)

Content.Client/Audio/AmbientSoundTreeSystem.cs

@@ -0,0 +1,31 @@
+using Content.Shared.Audio;
+using Robust.Shared.ComponentTrees;
+using Robust.Shared.Physics;
+
+namespace Content.Client.Audio;
+
+public sealed class AmbientSoundTreeSystem : ComponentTreeSystem<AmbientSoundTreeComponent, AmbientSoundComponent>
+{
+    #region Component Tree Overrides
+    protected override bool DoFrameUpdate => false;
+    protected override bool DoTickUpdate => true;
+    protected override int InitialCapacity => 256;
+    protected override bool Recursive => true;
+
+    protected override Box2 ExtractAabb(in ComponentTreeEntry<AmbientSoundComponent> entry, Vector2 pos, Angle rot)
+        => new Box2(pos - entry.Component.Range, pos + entry.Component.Range);
+
+    protected override Box2 ExtractAabb(in ComponentTreeEntry<AmbientSoundComponent> entry)
+    {
+        if (entry.Component.TreeUid == null)
+            return default;
+
+        var pos = XformSystem.GetRelativePosition(
+            entry.Transform,
+            entry.Component.TreeUid.Value,
+            GetEntityQuery<TransformComponent>());
+
+        return ExtractAabb(in entry, pos, default);
+    }
+    #endregion
+}