Allow registering "runtime classes"

Author: dsnopek

gdextension/gdextension_interface.h

@@ -290,7 +290,7 @@ typedef struct {
 GDExtensionClassGetVirtual get_virtual_func; // Queries a virtual function by name and returns a callback to invoke the requested virtual function.
 GDExtensionClassGetRID get_rid_func;
 void *class_userdata; // Per-class user data, later accessible in instance bindings.
-} GDExtensionClassCreationInfo; // Deprecated. Use GDExtensionClassCreationInfo2 instead.
+} GDExtensionClassCreationInfo; // Deprecated. Use GDExtensionClassCreationInfo3 instead.
 
 typedef struct {
 GDExtensionBool is_virtual;
@@ -323,7 +323,41 @@ typedef struct {
 GDExtensionClassCallVirtualWithData call_virtual_with_data_func;
 GDExtensionClassGetRID get_rid_func;
 void *class_userdata; // Per-class user data, later accessible in instance bindings.
-} GDExtensionClassCreationInfo2;
+} GDExtensionClassCreationInfo2; // Deprecated. Use GDExtensionClassCreationInfo3 instead.
+
+typedef struct {
+GDExtensionBool is_virtual;
+GDExtensionBool is_abstract;
+GDExtensionBool is_exposed;
+GDExtensionBool is_runtime;
+GDExtensionClassSet set_func;
+GDExtensionClassGet get_func;
+GDExtensionClassGetPropertyList get_property_list_func;
+GDExtensionClassFreePropertyList free_property_list_func;
+GDExtensionClassPropertyCanRevert property_can_revert_func;
+GDExtensionClassPropertyGetRevert property_get_revert_func;
+GDExtensionClassValidateProperty validate_property_func;
+GDExtensionClassNotification2 notification_func;
+GDExtensionClassToString to_string_func;
+GDExtensionClassReference reference_func;
+GDExtensionClassUnreference unreference_func;
+GDExtensionClassCreateInstance create_instance_func; // (Default) constructor; mandatory. If the class is not instantiable, consider making it virtual or abstract.
+GDExtensionClassFreeInstance free_instance_func; // Destructor; mandatory.
+GDExtensionClassRecreateInstance recreate_instance_func;
+// Queries a virtual function by name and returns a callback to invoke the requested virtual function.
+GDExtensionClassGetVirtual get_virtual_func;
+// Paired with `call_virtual_with_data_func`, this is an alternative to `get_virtual_func` for extensions that
+// need or benefit from extra data when calling virtual functions.
+// Returns user data that will be passed to `call_virtual_with_data_func`.
+// Returning `NULL` from this function signals to Godot that the virtual function is not overridden.
+// Data returned from this function should be managed by the extension and must be valid until the extension is deinitialized.
+// You should supply either `get_virtual_func`, or `get_virtual_call_data_func` with `call_virtual_with_data_func`.
+GDExtensionClassGetVirtualCallData get_virtual_call_data_func;
+// Used to call virtual functions when `get_virtual_call_data_func` is not null.
+GDExtensionClassCallVirtualWithData call_virtual_with_data_func;
+GDExtensionClassGetRID get_rid_func;
+void *class_userdata; // Per-class user data, later accessible in instance bindings.
+} GDExtensionClassCreationInfo3;
 
 typedef void *GDExtensionClassLibraryPtr;
 
@@ -2514,6 +2548,21 @@ typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass)(GDExtensionCla
  */
 typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass2)(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo2 *p_extension_funcs);
 
+/**
+ * @name classdb_register_extension_class3
+ * @since 4.3
+ *
+ * Registers an extension class in the ClassDB.
+ *
+ * Provided struct can be safely freed once the function returns.
+ *
+ * @param p_library A pointer the library received by the GDExtension's entry point function.
+ * @param p_class_name A pointer to a StringName with the class name.
+ * @param p_parent_class_name A pointer to a StringName with the parent class name.
+ * @param p_extension_funcs A pointer to a GDExtensionClassCreationInfo2 struct.
+ */
+typedef void (*GDExtensionInterfaceClassdbRegisterExtensionClass3)(GDExtensionClassLibraryPtr p_library, GDExtensionConstStringNamePtr p_class_name, GDExtensionConstStringNamePtr p_parent_class_name, const GDExtensionClassCreationInfo3 *p_extension_funcs);
+
 /**
  * @name classdb_register_extension_class_method
  * @since 4.1

include/godot_cpp/core/class_db.hpp

@@ -110,7 +110,7 @@ class ClassDB {
 static void bind_method_godot(const StringName &p_class_name, MethodBind *p_method);
 
 template <class T, bool is_abstract>
-static void _register_class(bool p_virtual = false, bool p_exposed = true);
+static void _register_class(bool p_virtual = false, bool p_exposed = true, bool p_runtime = false);
 
 template <class T>
 static GDExtensionObjectPtr _create_instance_func(void *data) {
@@ -146,6 +146,8 @@ class ClassDB {
 static void register_abstract_class();
 template <class T>
 static void register_internal_class();
+template <class T>
+static void register_runtime_class();
 
 _FORCE_INLINE_ static void _register_engine_class(const StringName &p_name, const GDExtensionInstanceBindingCallbacks *p_callbacks) {
 instance_binding_callbacks[p_name] = p_callbacks;
@@ -199,7 +201,7 @@ class ClassDB {
 }
 
 template <class T, bool is_abstract>
-void ClassDB::_register_class(bool p_virtual, bool p_exposed) {
+void ClassDB::_register_class(bool p_virtual, bool p_exposed, bool p_runtime) {
 static_assert(TypesAreSame<typename T::self_type, T>::value, "Class not declared properly, please use GDCLASS.");
 instance_binding_callbacks[T::get_class_static()] = &T::_gde_binding_callbacks;
 
@@ -217,10 +219,11 @@ void ClassDB::_register_class(bool p_virtual, bool p_exposed) {
 class_register_order.push_back(cl.name);
 
 // Register this class with Godot
-GDExtensionClassCreationInfo2 class_info = {
+GDExtensionClassCreationInfo3 class_info = {
 p_virtual, // GDExtensionBool is_virtual;
 is_abstract, // GDExtensionBool is_abstract;
 p_exposed, // GDExtensionBool is_exposed;
+p_runtime, // GDExtensionBool is_runtime;
 T::set_bind, // GDExtensionClassSet set_func;
 T::get_bind, // GDExtensionClassGet get_func;
 T::has_get_property_list() ? T::get_property_list_bind : nullptr, // GDExtensionClassGetPropertyList get_property_list_func;
@@ -242,7 +245,7 @@ void ClassDB::_register_class(bool p_virtual, bool p_exposed) {
 (void *)&T::get_class_static(), // void *class_userdata;
 };
 
-internal::gdextension_interface_classdb_register_extension_class2(internal::library, cl.name._native_ptr(), cl.parent_name._native_ptr(), &class_info);
+internal::gdextension_interface_classdb_register_extension_class3(internal::library, cl.name._native_ptr(), cl.parent_name._native_ptr(), &class_info);
 
 // call bind_methods etc. to register all members of the class
 T::initialize_class();
@@ -266,6 +269,11 @@ void ClassDB::register_internal_class() {
 ClassDB::_register_class<T, false>(false, false);
 }
 
+template <class T>
+void ClassDB::register_runtime_class() {
+ClassDB::_register_class<T, false>(false, true, true);
+}
+
 template <class N, class M, typename... VarArgs>
 MethodBind *ClassDB::bind_method(N p_method_name, M p_method, VarArgs... p_args) {
 Variant args[sizeof...(p_args) + 1] = { p_args..., Variant() }; // +1 makes sure zero sized arrays are also supported.
@@ -325,6 +333,7 @@ MethodBind *ClassDB::bind_vararg_method(uint32_t p_flags, StringName p_name, M p
 #define GDREGISTER_VIRTUAL_CLASS(m_class) ClassDB::register_class<m_class>(true);
 #define GDREGISTER_ABSTRACT_CLASS(m_class) ClassDB::register_abstract_class<m_class>();
 #define GDREGISTER_INTERNAL_CLASS(m_class) ClassDB::register_internal_class<m_class>();
+#define GDREGISTER_RUNTIME_CLASS(m_class) ClassDB::register_runtime_class<m_class>();
 
 } // namespace godot
 

include/godot_cpp/godot.hpp

@@ -177,7 +177,7 @@ extern "C" GDExtensionInterfacePlaceHolderScriptInstanceUpdate gdextension_inter
 extern "C" GDExtensionInterfaceClassdbConstructObject gdextension_interface_classdb_construct_object;
 extern "C" GDExtensionInterfaceClassdbGetMethodBind gdextension_interface_classdb_get_method_bind;
 extern "C" GDExtensionInterfaceClassdbGetClassTag gdextension_interface_classdb_get_class_tag;
-extern "C" GDExtensionInterfaceClassdbRegisterExtensionClass2 gdextension_interface_classdb_register_extension_class2;
+extern "C" GDExtensionInterfaceClassdbRegisterExtensionClass3 gdextension_interface_classdb_register_extension_class3;
 extern "C" GDExtensionInterfaceClassdbRegisterExtensionClassMethod gdextension_interface_classdb_register_extension_class_method;
 extern "C" GDExtensionInterfaceClassdbRegisterExtensionClassVirtualMethod gdextension_interface_classdb_register_extension_class_virtual_method;
 extern "C" GDExtensionInterfaceClassdbRegisterExtensionClassIntegerConstant gdextension_interface_classdb_register_extension_class_integer_constant;

src/godot.cpp

@@ -183,7 +183,7 @@ GDExtensionInterfacePlaceHolderScriptInstanceUpdate gdextension_interface_placeh
 GDExtensionInterfaceClassdbConstructObject gdextension_interface_classdb_construct_object = nullptr;
 GDExtensionInterfaceClassdbGetMethodBind gdextension_interface_classdb_get_method_bind = nullptr;
 GDExtensionInterfaceClassdbGetClassTag gdextension_interface_classdb_get_class_tag = nullptr;
-GDExtensionInterfaceClassdbRegisterExtensionClass2 gdextension_interface_classdb_register_extension_class2 = nullptr;
+GDExtensionInterfaceClassdbRegisterExtensionClass3 gdextension_interface_classdb_register_extension_class3 = nullptr;
 GDExtensionInterfaceClassdbRegisterExtensionClassMethod gdextension_interface_classdb_register_extension_class_method = nullptr;
 GDExtensionInterfaceClassdbRegisterExtensionClassVirtualMethod gdextension_interface_classdb_register_extension_class_virtual_method = nullptr;
 GDExtensionInterfaceClassdbRegisterExtensionClassIntegerConstant gdextension_interface_classdb_register_extension_class_integer_constant = nullptr;
@@ -423,7 +423,7 @@ GDExtensionBool GDExtensionBinding::init(GDExtensionInterfaceGetProcAddress p_ge
 LOAD_PROC_ADDRESS(classdb_construct_object, GDExtensionInterfaceClassdbConstructObject);
 LOAD_PROC_ADDRESS(classdb_get_method_bind, GDExtensionInterfaceClassdbGetMethodBind);
 LOAD_PROC_ADDRESS(classdb_get_class_tag, GDExtensionInterfaceClassdbGetClassTag);
-LOAD_PROC_ADDRESS(classdb_register_extension_class2, GDExtensionInterfaceClassdbRegisterExtensionClass2);
+LOAD_PROC_ADDRESS(classdb_register_extension_class3, GDExtensionInterfaceClassdbRegisterExtensionClass3);
 LOAD_PROC_ADDRESS(classdb_register_extension_class_method, GDExtensionInterfaceClassdbRegisterExtensionClassMethod);
 LOAD_PROC_ADDRESS(classdb_register_extension_class_virtual_method, GDExtensionInterfaceClassdbRegisterExtensionClassVirtualMethod);
 LOAD_PROC_ADDRESS(classdb_register_extension_class_integer_constant, GDExtensionInterfaceClassdbRegisterExtensionClassIntegerConstant);

test/src/example.cpp

@@ -637,3 +637,23 @@ String Example::test_virtual_implemented_in_script(const String &p_name, int p_v
 }
 return "Unimplemented";
 }
+
+void ExampleRuntime::_bind_methods() {
+ClassDB::bind_method(D_METHOD("set_prop_value", "value"), &ExampleRuntime::set_prop_value);
+ClassDB::bind_method(D_METHOD("get_prop_value"), &ExampleRuntime::get_prop_value);
+ADD_PROPERTY(PropertyInfo(Variant::INT, "prop_value"), "set_prop_value", "get_prop_value");
+}
+
+void ExampleRuntime::set_prop_value(int p_prop_value) {
+prop_value = p_prop_value;
+}
+
+int ExampleRuntime::get_prop_value() const {
+return prop_value;
+}
+
+ExampleRuntime::ExampleRuntime() {
+}
+
+ExampleRuntime::~ExampleRuntime() {
+}

test/src/example.h

@@ -220,4 +220,20 @@ class ExampleConcrete : public ExampleAbstractBase {
 virtual int test_function() override { return 25; }
 };
 
+class ExampleRuntime : public Node {
+GDCLASS(ExampleRuntime, Node);
+
+int prop_value = 12;
+
+protected:
+static void _bind_methods();
+
+public:
+void set_prop_value(int p_prop_value);
+int get_prop_value() const;
+
+ExampleRuntime();
+~ExampleRuntime();
+};
+
 #endif // EXAMPLE_CLASS_H

test/src/register_types.cpp

@@ -27,6 +27,7 @@ void initialize_example_module(ModuleInitializationLevel p_level) {
 ClassDB::register_class<ExampleVirtual>(true);
 ClassDB::register_abstract_class<ExampleAbstractBase>();
 ClassDB::register_class<ExampleConcrete>();
+ClassDB::register_runtime_class<ExampleRuntime>();
 }
 
 void uninitialize_example_module(ModuleInitializationLevel p_level) {