Fix tile parsing and decal rotation

• Decals now respond to rotation and offset tools again
• Fix tile value parsing
• Fix broken normals when projecting on parts with no normal maps

Source/ConformalDecals/DecalConfig.cs

@@ -1,9 +1,13 @@
 using System.Collections.Generic;
 using UnityEngine;
+using UnityEngine.Experimental.Rendering;
 
 namespace ConformalDecals {
     public static class DecalConfig {
+        private static Texture2D _blankNormal;
         private static List<string> _shaderBlacklist;
+        
+        public static Texture2D BlankNormal => _blankNormal;
 
         public static bool IsBlacklisted(Shader shader) {
             return IsBlacklisted(shader.name);
@@ -21,6 +25,24 @@ namespace ConformalDecals {
             }
         }
 
+        private static Texture2D MakeBlankNormal() {
+            Debug.Log("ConformalDecals: Generating neutral normal map texture");
+            var width = 2;
+            var height = 2;
+            var color = new Color32(255, 128, 128, 128);
+            var colors = new Color32[] { color, color, color, color };
+
+            var tex = new Texture2D(width, height, TextureFormat.RGBA32, false);
+            for (var x = 0; x <= width; x++) {
+                for (var y = 0; y < height; y++) {
+                    tex.SetPixels32(colors);
+                }
+            }
+            tex.Apply();
+
+            return tex;
+        }
+
         public static void ModuleManagerPostLoad() {
             _shaderBlacklist = new List<string>();
 
@@ -32,6 +54,8 @@ namespace ConformalDecals {
                     ParseConfig(config.config);
                 }
             }
+
+            _blankNormal = MakeBlankNormal();
         }
     }
 }