Merge pull request #80040 from fuzzybinary/add-object-get-script-instance

Add `get_script_instance` to GDExtension

core/extension/gdextension_interface.cpp

@@ -1048,6 +1048,25 @@ static GDExtensionScriptInstancePtr gdextension_script_instance_create(const GDE
 	return reinterpret_cast<GDExtensionScriptInstancePtr>(script_instance_extension);
 }
 
+static GDExtensionScriptInstancePtr gdextension_object_get_script_instance(GDExtensionConstObjectPtr p_object, GDExtensionConstObjectPtr p_language) {
+	if (!p_object || !p_language) {
+		return nullptr;
+	}
+
+	const Object *o = (const Object *)p_object;
+	ScriptInstanceExtension *script_instance_extension = reinterpret_cast<ScriptInstanceExtension *>(o->get_script_instance());
+	if (!script_instance_extension) {
+		return nullptr;
+	}
+
+	const ScriptLanguage *language = script_instance_extension->get_language();
+	if (language != p_language) {
+		return nullptr;
+	}
+
+	return script_instance_extension->instance;
+}
+
 static GDExtensionMethodBindPtr gdextension_classdb_get_method_bind(GDExtensionConstStringNamePtr p_classname, GDExtensionConstStringNamePtr p_methodname, GDExtensionInt p_hash) {
 	const StringName classname = *reinterpret_cast<const StringName *>(p_classname);
 	const StringName methodname = *reinterpret_cast<const StringName *>(p_methodname);
@@ -1216,6 +1235,7 @@ void gdextension_setup_interface() {
 	REGISTER_INTERFACE_FUNC(ref_get_object);
 	REGISTER_INTERFACE_FUNC(ref_set_object);
 	REGISTER_INTERFACE_FUNC(script_instance_create);
+	REGISTER_INTERFACE_FUNC(object_get_script_instance);
 	REGISTER_INTERFACE_FUNC(classdb_construct_object);
 	REGISTER_INTERFACE_FUNC(classdb_get_method_bind);
 	REGISTER_INTERFACE_FUNC(classdb_get_class_tag);

core/extension/gdextension_interface.h

@@ -2126,6 +2126,19 @@ typedef void (*GDExtensionInterfaceRefSetObject)(GDExtensionRefPtr p_ref, GDExte
  */
 typedef GDExtensionScriptInstancePtr (*GDExtensionInterfaceScriptInstanceCreate)(const GDExtensionScriptInstanceInfo *p_info, GDExtensionScriptInstanceDataPtr p_instance_data);
 
+/**
+ * @name object_get_script_instance
+ * @since 4.2
+ *
+ * Get the script instance data attached to this object.
+ *
+ * @param p_object A pointer to the Object.
+ * @param p_language A pointer to the language expected for this script instance.
+ *
+ * @return A GDExtensionScriptInstanceDataPtr that was attached to this object as part of script_instance_create.
+ */
+typedef GDExtensionScriptInstanceDataPtr (*GDExtensionInterfaceObjectGetScriptInstance)(GDExtensionConstObjectPtr p_object, GDExtensionObjectPtr p_language);
+
 /* INTERFACE: ClassDB */
 
 /**