fix(lods): fix obsolete ShaderUtil usage in LODGenerator for Unity 2021.2+ (#74)

* Fix Obsolete ShaderUtil usage in LODGenerator for Unity 2021.2+

* style(lod) : add missing neweline at the end of LODGenerator.cs

* style: fix indentation

---------

Co-authored-by: Whinarn <[email protected]>

Author: Abhilash1205

Runtime/LODGenerator.cs

@@ -769,18 +769,30 @@ private static void DestroyLODMaterialAsset(Material material)
             if (shader == null)
                 return;
 
-            // We find all texture properties of materials and delete those assets also
+            // Find all texture properties of materials and delete those assets also
+#if UNITY_2021_2_OR_NEWER
+            int propertyCount = shader.GetPropertyCount();
+            for (int propertyIndex = 0; propertyIndex < propertyCount; propertyIndex++)
+            {
+                if (shader.GetPropertyType(propertyIndex) == UnityEngine.Rendering.ShaderPropertyType.Texture)
+                {
+                    string propertyName = shader.GetPropertyName(propertyIndex);
+                    var texture = material.GetTexture(propertyName);
+                    DestroyLODAsset(texture);
+                }
+            }
+#else
             int propertyCount = UnityEditor.ShaderUtil.GetPropertyCount(shader);
             for (int propertyIndex = 0; propertyIndex < propertyCount; propertyIndex++)
             {
-                var propertyType = UnityEditor.ShaderUtil.GetPropertyType(shader, propertyIndex);
-                if (propertyType == UnityEditor.ShaderUtil.ShaderPropertyType.TexEnv)
+                if (UnityEditor.ShaderUtil.GetPropertyType(shader, propertyIndex) == UnityEditor.ShaderUtil.ShaderPropertyType.TexEnv)
                 {
                     string propertyName = UnityEditor.ShaderUtil.GetPropertyName(shader, propertyIndex);
                     var texture = material.GetTexture(propertyName);
                     DestroyLODAsset(texture);
                 }
             }
+#endif
 
             DestroyLODAsset(material);
         }