feat: surface patch

fixes #333

FairyTaleDefender/Assets/_Game/Scripts/Editor/AssetProcessors/DefaultMaterialsAssetPostprocessor.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Linq;
+using UnityEditor;
+using UnityEngine;
+
+namespace BoundfoxStudios.FairyTaleDefender.Editor.AssetProcessors
+{
+	public class DefaultMaterialsAssetPostprocessor : AssetPostprocessor
+	{
+		private const string ColorPaletteSummerMaterialGuid = "178b74dc53be54709b84d85209d03744";
+		private const string TileSurfaceMaterialGuid = "4a52ce37bf16a42a29e689c796f909ac";
+
+		private Material? OnAssignMaterialModel(Material material, Renderer renderer)
+		{
+			if (TryHandleMaterial(material, "ColorPalette", FindColorPaletteSummerMaterial, out var colorPaletteMaterial))
+			{
+				return colorPaletteMaterial;
+			}
+
+			if (TryHandleMaterial(material, "Surface", FindTileSurfaceMaterial, out var surfaceMaterial))
+			{
+				return surfaceMaterial;
+			}
+
+			return null;
+		}
+
+		private bool TryHandleMaterial(Material material, string name, Func<Material?> materialAccessor,
+			out Material? materialToApply)
+		{
+			materialToApply = null;
+
+			if (material.name != name)
+			{
+				return false;
+			}
+
+			var importer = (ModelImporter)assetImporter;
+			var existingRemaps = importer.GetExternalObjectMap();
+			var hasRemap = existingRemaps.Any(kvp => kvp.Key.name == name);
+
+			if (hasRemap)
+			{
+				return false;
+			}
+
+			materialToApply = materialAccessor();
+
+			return true;
+		}
+
+		private Material? FindColorPaletteSummerMaterial() => FindMaterial(ColorPaletteSummerMaterialGuid);
+
+		private Material? FindTileSurfaceMaterial() => FindMaterial(TileSurfaceMaterialGuid);
+
+		private Material? FindMaterial(string guidString)
+		{
+			GUID.TryParse(guidString, out var guid);
+			context.DependsOnSourceAsset(guid);
+			var path = AssetDatabase.GUIDToAssetPath(guidString);
+			return AssetDatabase.LoadAssetAtPath<Material>(path);
+		}
+
+		public override uint GetVersion() => 5;
+	}
+}