Mono/C#: Allow exporting System.Array of type Godot.Object

(cherry picked from commit 0fec3cb5ed)

modules/mono/mono_gd/gd_mono_field.cpp

@@ -281,6 +281,13 @@ void GDMonoField::set_value_from_variant(MonoObject *p_object, const Variant &p_
 				break;
 			}
 
+			GDMonoClass *array_type_class = GDMono::get_singleton()->get_class(array_type->eklass);
+			if (CACHED_CLASS(GodotObject)->is_assignable_from(array_type_class)) {
+				MonoArray *managed = GDMonoMarshal::Array_to_mono_array(p_value.operator ::Array(), array_type_class);
+				mono_field_set_value(p_object, mono_field, managed);
+				break;
+			}
+
 			ERR_FAIL_MSG("Attempted to convert Variant to a managed array of unmarshallable element type.");
 		} break;
 

modules/mono/mono_gd/gd_mono_marshal.cpp

@@ -132,6 +132,10 @@ Variant::Type managed_to_variant_type(const ManagedType &p_type) {
 
 			if (array_type->eklass == CACHED_CLASS_RAW(Color))
 				return Variant::POOL_COLOR_ARRAY;
+
+			GDMonoClass *array_type_class = GDMono::get_singleton()->get_class(array_type->eklass);
+			if (CACHED_CLASS(GodotObject)->is_assignable_from(array_type_class))
+				return Variant::ARRAY;
 		} break;
 
 		case MONO_TYPE_CLASS: {
@@ -217,6 +221,13 @@ Variant::Type managed_to_variant_type(const ManagedType &p_type) {
 
 bool try_get_array_element_type(const ManagedType &p_array_type, ManagedType &r_elem_type) {
 	switch (p_array_type.type_encoding) {
+		case MONO_TYPE_ARRAY:
+		case MONO_TYPE_SZARRAY: {
+			MonoArrayType *array_type = mono_type_get_array_type(p_array_type.type_class->get_mono_type());
+			GDMonoClass *array_type_class = GDMono::get_singleton()->get_class(array_type->eklass);
+			r_elem_type = ManagedType::from_class(array_type_class);
+			return true;
+		} break;
 		case MONO_TYPE_GENERICINST: {
 			MonoReflectionType *array_reftype = mono_type_get_object(mono_domain_get(), p_array_type.type_class->get_mono_type());
 
@@ -511,6 +522,10 @@ MonoObject *variant_to_mono_object(const Variant *p_var, const ManagedType &p_ty
 			if (array_type->eklass == CACHED_CLASS_RAW(Color))
 				return (MonoObject *)PoolColorArray_to_mono_array(p_var->operator PoolColorArray());
 
+			GDMonoClass *array_type_class = GDMono::get_singleton()->get_class(array_type->eklass);
+			if (CACHED_CLASS(GodotObject)->is_assignable_from(array_type_class))
+				return (MonoObject *)Array_to_mono_array(p_var->operator Array(), array_type_class);
+
 			ERR_FAIL_V_MSG(NULL, "Attempted to convert Variant to a managed array of unmarshallable element type.");
 		} break;
 
@@ -805,6 +820,10 @@ Variant mono_object_to_variant_impl(MonoObject *p_obj, const ManagedType &p_type
 			if (array_type->eklass == CACHED_CLASS_RAW(Color))
 				return mono_array_to_PoolColorArray((MonoArray *)p_obj);
 
+			GDMonoClass *array_type_class = GDMono::get_singleton()->get_class(array_type->eklass);
+			if (CACHED_CLASS(GodotObject)->is_assignable_from(array_type_class))
+				return mono_array_to_Array((MonoArray *)p_obj);
+
 			if (p_fail_with_err) {
 				ERR_FAIL_V_MSG(Variant(), "Attempted to convert a managed array of unmarshallable element type to Variant.");
 			} else {
@@ -970,6 +989,18 @@ MonoArray *Array_to_mono_array(const Array &p_array) {
 	return ret;
 }
 
+MonoArray *Array_to_mono_array(const Array &p_array, GDMonoClass *p_array_type_class) {
+	int length = p_array.size();
+	MonoArray *ret = mono_array_new(mono_domain_get(), p_array_type_class->get_mono_ptr(), length);
+
+	for (int i = 0; i < length; i++) {
+		MonoObject *boxed = variant_to_mono_object(p_array[i]);
+		mono_array_setref(ret, i, boxed);
+	}
+
+	return ret;
+}
+
 Array mono_array_to_Array(MonoArray *p_array) {
 	Array ret;
 	if (!p_array)

modules/mono/mono_gd/gd_mono_marshal.h

@@ -125,6 +125,7 @@ String mono_object_to_variant_string(MonoObject *p_obj, MonoException **r_exc);
 // Array
 
 MonoArray *Array_to_mono_array(const Array &p_array);
+MonoArray *Array_to_mono_array(const Array &p_array, GDMonoClass *p_array_type_class);
 Array mono_array_to_Array(MonoArray *p_array);
 
 // PoolIntArray