Makes Eyepatches Flippable (#26277)

Content.Client/Clothing/ClientClothingSystem.cs

@@ -1,5 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using System.Numerics;
 using Content.Client.Inventory;
 using Content.Shared.Clothing;
 using Content.Shared.Clothing.Components;
@@ -113,6 +114,7 @@ public sealed class ClientClothingSystem : ClothingSystem
                 i++;
             }
 
+            item.MappedLayer = key;
             args.Layers.Add((key, layer));
         }
     }
@@ -153,13 +155,9 @@ public sealed class ClientClothingSystem : ClothingSystem
 
         // species specific
         if (speciesId != null && rsi.TryGetState($"{state}-{speciesId}", out _))
-        {
             state = $"{state}-{speciesId}";
-        }
         else if (!rsi.TryGetState(state, out _))
-        {
             return false;
-        }
 
         var layer = new PrototypeLayerData();
         layer.RsiPath = rsi.Path.ToString();
@@ -287,6 +285,8 @@ public sealed class ClientClothingSystem : ClothingSystem
 
                 if (layerData.Color != null)
                     sprite.LayerSetColor(key, layerData.Color.Value);
+                if (layerData.Scale != null)
+                    sprite.LayerSetScale(key, layerData.Scale.Value);
             }
             else
                 index = sprite.LayerMapReserveBlank(key);

Content.Client/Clothing/FlippableClothingVisualizerSystem.cs

@@ -0,0 +1,48 @@
+using Content.Shared.Clothing;
+using Content.Shared.Clothing.Components;
+using Content.Shared.Clothing.EntitySystems;
+using Content.Shared.Foldable;
+using Content.Shared.Item;
+using Robust.Client.GameObjects;
+
+namespace Content.Client.Clothing;
+
+public sealed class FlippableClothingVisualizerSystem  : VisualizerSystem<FlippableClothingVisualsComponent>
+{
+    [Dependency] private readonly SharedItemSystem _itemSys = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<FlippableClothingVisualsComponent, GetEquipmentVisualsEvent>(OnGetVisuals, after: [typeof(ClothingSystem)]);
+        SubscribeLocalEvent<FlippableClothingVisualsComponent, FoldedEvent>(OnFolded);
+    }
+
+    private void OnFolded(Entity<FlippableClothingVisualsComponent> ent, ref FoldedEvent args)
+    {
+        _itemSys.VisualsChanged(ent);
+    }
+
+    private void OnGetVisuals(Entity<FlippableClothingVisualsComponent> ent, ref GetEquipmentVisualsEvent args)
+    {
+        if (!TryComp(ent, out SpriteComponent? sprite) ||
+            !TryComp(ent, out ClothingComponent? clothing))
+            return;
+
+        if (clothing.MappedLayer == null ||
+            !AppearanceSystem.TryGetData<bool>(ent, FoldableSystem.FoldedVisuals.State, out var folding) ||
+            !sprite.LayerMapTryGet(folding ? ent.Comp.FoldingLayer : ent.Comp.UnfoldingLayer, out var idx))
+            return;
+
+        // add each layer to the visuals
+        var spriteLayer = sprite[idx];
+        foreach (var layer in args.Layers)
+        {
+            if (layer.Item1 != clothing.MappedLayer)
+                continue;
+
+            layer.Item2.Scale = spriteLayer.Scale;
+        }
+    }
+}

Content.Client/Clothing/FlippableClothingVisualsComponent.cs

@@ -0,0 +1,16 @@
+namespace Content.Client.Clothing;
+
+/// <summary>
+/// Communicates folded layers data (currently only Scale to handle flipping)
+/// to the wearer clothing sprite layer
+/// </summary>
+[RegisterComponent]
+[Access(typeof(FlippableClothingVisualizerSystem))]
+public sealed partial class FlippableClothingVisualsComponent : Component
+{
+    [DataField]
+    public string FoldingLayer = "foldedLayer";
+
+    [DataField]
+    public string UnfoldingLayer = "unfoldedLayer";
+}