_assetref setunsafe (unstable buggy)

Source/Engine/Content/AssetReference.h

@@ -217,6 +217,17 @@ public:
     {
         OnSet(asset);
     }
+
+    /// <summary>
+    /// Sets the asset reference without binding the events.
+    /// This should only be used cautiously in cases where the reference needs to be held for a short time (for example in while marshalling managed types).
+    /// </summary>
+    /// <param name="asset">The asset.</param>
+    void SetUnsafe(T* asset)
+    {
+        ASSERT(_asset == nullptr || asset == nullptr);
+        _asset = asset;
+    }
 };
 
 template<typename T>

Source/Tools/Flax.Build/Bindings/BindingsGenerator.Cpp.cs

@@ -715,8 +715,16 @@ namespace Flax.Build.Bindings
                     // For non-pod types converting only, other API converts managed to unmanaged object in C# wrapper code)
                     if (CppNonPodTypesConvertingGeneration)
                     {
-                        type = "MObject*";
+                        if (typeInfo.Type == "AssetReference")
-                        return "(" + typeInfo.GenericArgs[0].Type + "*)ScriptingObject::ToNative({0})";
+                        {
+                            type = "MObject*";
+                            return "(" + typeInfo.GenericArgs[0].Type + "*)ScriptingObject::ToNative({0})";
+                        }
+                        else
+                        {
+                            type = "MObject*";
+                            return "(" + typeInfo.GenericArgs[0].Type + "*)ScriptingObject::ToNative({0})";
+                        }
                     }
 
                     type = typeInfo.GenericArgs[0].Type + '*';
@@ -1264,7 +1272,7 @@ namespace Flax.Build.Bindings
                     callParams += parameterInfo.Name;
                     callParams += "Temp";
                 }
-                // Instruct for more optoimized value move operation
+                // Instruct for more optimized value move operation
                 else if (parameterInfo.Type.IsMoveRef)
                 {
                     callParams += $"MoveTemp({param})";
@@ -1357,6 +1365,27 @@ namespace Flax.Build.Bindings
                 }
             }
 
+            // Free special native resources
+            bool needsCleanup = false;
+            for (var i = 0; i < functionInfo.Parameters.Count; i++)
+            {
+                var parameterInfo = functionInfo.Parameters[i];
+                if (/*CppParamsThatNeedConversion[i] ||*/ CppParamsThatNeedLocalVariable[i])
+                {
+                    needsCleanup = true;
+                    //break;
+                    //if (parameterInfo.Type.Type == "AssetReference")
+                    var apiType = FindApiTypeInfo(buildData, parameterInfo.Type, caller);
+                    if (apiType != null && apiType.IsStruct && !apiType.IsPod)
+                        contents.Append(indent).AppendFormat("FreeNative({0}Temp);", parameterInfo.Name).AppendLine();
+                }
+            }
+
+            if (needsCleanup)
+            {
+                //contents.Append(indent).AppendFormat("FreeNative({0});", parameterInfo.Name, value).AppendLine();
+            }
+
             if (!useInlinedReturn && !functionInfo.Glue.UseReferenceForResult && !functionInfo.ReturnType.IsVoid)
             {
                 contents.Append(indent).Append("return __result;").AppendLine();
@@ -2937,6 +2966,7 @@ namespace Flax.Build.Bindings
                         header.AppendLine("namespace {");
                         header.AppendFormat("{0} ToManaged(const {1}& value);", wrapperName, fullName).AppendLine();
                         header.AppendFormat("{1} ToNative(const {0}& value);", wrapperName, fullName).AppendLine();
+                        header.AppendFormat("void FreeNative({0}& value);", fullName).AppendLine();
                         header.AppendLine("}");
 
                         // Generate MConverter for a structure
@@ -3038,13 +3068,30 @@ namespace Flax.Build.Bindings
                                 continue;
                             }
 
-                            if (string.IsNullOrEmpty(wrapper))
+                            if (fieldInfo.Type.Type == "AssetReference" && !string.IsNullOrEmpty(wrapper))
+                                header.AppendFormat("    result.{0}.SetUnsafe({1});", fieldInfo.Name, string.Format(wrapper, string.Format("value.{0}", fieldInfo.Name))).AppendLine();
+                            else if (string.IsNullOrEmpty(wrapper))
                                 header.AppendFormat("    result.{0} = value.{0};", fieldInfo.Name).AppendLine();
                             else
                                 header.AppendFormat("    result.{0} = {1};", fieldInfo.Name, string.Format(wrapper, string.Format("value.{0}", fieldInfo.Name))).AppendLine();
                         }
                         header.Append("    return result;").AppendLine();
                         header.Append('}').AppendLine();
+
+                        // Generate cleanup function for native resources
+                        header.AppendLine();
+                        header.AppendFormat("void FreeNative({0}& value)", fullName).AppendLine();
+                        header.Append('{').AppendLine();
+                        for (var i = 0; i < fields.Count; i++)
+                        {
+                            var fieldInfo = fields[i];
+                            if (fieldInfo.IsStatic || fieldInfo.IsConstexpr)
+                                continue;
+
+                            if (fieldInfo.Type.Type == "AssetReference")
+                                header.AppendFormat("    value.{0}.SetUnsafe(nullptr);", fieldInfo.Name).AppendLine();
+                        }
+                        header.Append('}').AppendLine();
                         header.AppendLine("}");
                     }
                     else if (classInfo != null)