Add basic model caching

project/code/LGS/ResourcePathManager.cs

@@ -164,7 +164,7 @@ public class ResourcePathManager
         return null;
     }
 
-    public string GetObjectPath(string campaignName, string objectName)
+    public string GetObjectPath(ref string campaignName, string objectName)
     {
         if (!_initialised) return null;
 
@@ -184,6 +184,7 @@ public class ResourcePathManager
             }
             else if (_omResources.objectPathMap.TryGetValue(objectName, out var omPath))
             {
+                campaignName = "";
                 return omPath;
             }
         }

project/code/TMV/Mission.cs

@@ -44,11 +44,13 @@ public partial class Mission : Node3D
 	ResourcePathManager _installPaths;
 	DbFile _file;
 	TextureLoader _textureLoader;
+	ModelLoader _modelLoader;
 
 	public override void _Ready()
 	{
 		var extractPath = ProjectSettings.GlobalizePath($"user://extracted/tmp");
 		_installPaths = new ResourcePathManager(extractPath);
+		_modelLoader = new ModelLoader(_installPaths);
 		var missionSelector = GetNode<Control>("%MissionSelector") as MissionSelector;
 		missionSelector.pathManager = _installPaths;
 		missionSelector.MissionSelected += (string campaign, string mission) =>
@@ -123,8 +125,7 @@ public partial class Mission : Node3D
 			objHierarchy = new ObjectHierarchy(_file);
 		}
 
-		if (
-			_file.Chunks.TryGetValue("BRLIST", out var brList))
+		if (_file.Chunks.TryGetValue("BRLIST", out var brList))
 		{
 			PlaceObjects((BrList)brList, objHierarchy);
 		}
@@ -168,7 +169,7 @@ public partial class Mission : Node3D
 			var rawRot = brush.angle;
 			var rot = new Vector3(rawRot.Y, rawRot.Z, rawRot.X) * 360 / ushort.MaxValue;
 			var scale = scaleProp == null ? Vector3.One : scaleProp.scale.ToGodotVec3(false);
-			var model = ModelLoader.LoadModel(_installPaths, _campaignName, modelName);
+			var model = _modelLoader.Load(_campaignName, modelName);
 			if (model != null)
 			{
 				model.Position = pos;

project/code/TMV/ModelLoader.cs

@@ -1,15 +1,53 @@
 using System.Collections.Generic;
-using System.IO;
 using Godot;
 using KeepersCompound.LGS;
 
 namespace KeepersCompound.TMV;
 
-public static class ModelLoader
+public class ModelLoader
 {
-    public static MeshInstance3D LoadModel(ResourcePathManager pathManager, string campaignName, string modelName)
+    private readonly Dictionary<(string, string), MeshInstance3D> _cache;
+    private readonly ResourcePathManager _pathManager;
+
+    public ModelLoader(ResourcePathManager pathManager)
     {
-        var modelPath = pathManager.GetObjectPath(campaignName, modelName);
+        _pathManager = pathManager;
+        _cache = new Dictionary<(string, string), MeshInstance3D>();
+    }
+
+    public MeshInstance3D Load(string campaignName, string modelName, bool forceLoad = false)
+    {
+        campaignName ??= "";
+
+        if (!forceLoad)
+        {
+            if (_cache.TryGetValue((campaignName, modelName), out var fmModel))
+            {
+                return fmModel == null ? fmModel : fmModel.Duplicate() as MeshInstance3D;
+            }
+            else if (_cache.TryGetValue(("", modelName), out var omModel))
+            {
+                return omModel == null ? omModel : omModel.Duplicate() as MeshInstance3D;
+            }
+        }
+
+        // We don't care if this is null actually, we'll still cache that it's null lol
+        var model = LoadModel(_pathManager, ref campaignName, modelName);
+        var key = (campaignName, modelName);
+        if (_cache.ContainsKey(key))
+        {
+            _cache[key] = model;
+        }
+        else
+        {
+            _cache.TryAdd(key, model);
+        }
+        return model == null ? model : model.Duplicate() as MeshInstance3D;
+    }
+
+    public static MeshInstance3D LoadModel(ResourcePathManager pathManager, ref string campaignName, string modelName)
+    {
+        var modelPath = pathManager.GetObjectPath(ref campaignName, modelName);
         if (modelPath == null)
         {
             return null;