Per-map parallax support (#9786)

* Per-map parallax support

* Comments for future sloth

* c

* bet

* Fix exception

* VV support

* Fix parallax

* mem

* weightless sounds

* Gravity stuff

* placeholder coz im too lazy to stash don't @ me son

* decent clouds

* sky

* Fast parallax

* Imagine spelling

* Loicense

* perish

* Fix weightless status

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Client/Parallax/Managers/IParallaxManager.cs

@@ -1,35 +1,30 @@
-using System;
-using Robust.Client.Graphics;
-using Content.Client.Parallax;
+using System.Threading.Tasks;
+using Robust.Shared.Maths;
 
 namespace Content.Client.Parallax.Managers;
 
 public interface IParallaxManager
 {
-    /// <summary>
-    /// The current parallax.
-    /// Changing this causes a new parallax to be loaded (eventually).
-    /// Do not alter until prototype manager is available.
-    /// Useful "csi" input for testing new parallaxes:
-    /// using Content.Client.Parallax.Managers; IoCManager.Resolve<IParallaxManager>().ParallaxName = "test";
-    /// </summary>
-    string ParallaxName { get; set; }
-
     /// <summary>
     /// All WorldHomePosition values are offset by this.
     /// </summary>
     Vector2 ParallaxAnchor { get; set; }
 
-    /// <summary>
-    /// The layers of the currently loaded parallax.
-    /// This will change on a whim without notification.
-    /// </summary>
-    ParallaxLayerPrepared[] ParallaxLayers { get; }
+    bool IsLoaded(string name);
 
     /// <summary>
-    /// Used to initialize the manager.
+    /// The layers of the selected parallax.
+    /// </summary>
+    ParallaxLayerPrepared[] GetParallaxLayers(string name);
+
+    /// <summary>
+    /// Loads in the default parallax to use.
     /// Do not call until prototype manager is available.
     /// </summary>
-    void LoadParallax();
+    void LoadDefaultParallax();
+
+    Task LoadParallaxByName(string name);
+
+    void UnloadParallax(string name);
 }