/**************************************************************************/ /* wrapped.hpp */ /**************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /**************************************************************************/ /* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */ /* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */ /* */ /* Permission is hereby granted, free of charge, to any person obtaining */ /* a copy of this software and associated documentation files (the */ /* "Software"), to deal in the Software without restriction, including */ /* without limitation the rights to use, copy, modify, merge, publish, */ /* distribute, sublicense, and/or sell copies of the Software, and to */ /* permit persons to whom the Software is furnished to do so, subject to */ /* the following conditions: */ /* */ /* The above copyright notice and this permission notice shall be */ /* included in all copies or substantial portions of the Software. */ /* */ /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */ /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /**************************************************************************/ #ifndef GODOT_WRAPPED_HPP #define GODOT_WRAPPED_HPP #include #include #include #include namespace godot { class ClassDB; typedef void GodotObject; // Base for all engine classes, to contain the pointer to the engine instance. class Wrapped { friend class GDExtensionBinding; friend void postinitialize_handler(Wrapped *); protected: virtual const StringName *_get_extension_class_name() const; // This is needed to retrieve the class name before the godot object has its _extension and _extension_instance members assigned. virtual const GDExtensionInstanceBindingCallbacks *_get_bindings_callbacks() const = 0; void _notification(int p_what) {} bool _set(const StringName &p_name, const Variant &p_property) { return false; } bool _get(const StringName &p_name, Variant &r_property) const { return false; } void _get_property_list(List *p_list) const {} bool _property_can_revert(const StringName &p_name) const { return false; } bool _property_get_revert(const StringName &p_name, Variant &r_property) const { return false; } void _validate_property(PropertyInfo &p_property) const {} String _to_string() const { return "[" + String(get_class_static()) + ":" + itos(get_instance_id()) + "]"; } static void notification_bind(GDExtensionClassInstancePtr p_instance, int32_t p_what, GDExtensionBool p_reversed) {} static GDExtensionBool set_bind(GDExtensionClassInstancePtr p_instance, GDExtensionConstStringNamePtr p_name, GDExtensionConstVariantPtr p_value) { return false; } static GDExtensionBool get_bind(GDExtensionClassInstancePtr p_instance, GDExtensionConstStringNamePtr p_name, GDExtensionVariantPtr r_ret) { return false; } static const GDExtensionPropertyInfo *get_property_list_bind(GDExtensionClassInstancePtr p_instance, uint32_t *r_count) { return nullptr; } static void free_property_list_bind(GDExtensionClassInstancePtr p_instance, const GDExtensionPropertyInfo *p_list) {} static GDExtensionBool property_can_revert_bind(GDExtensionClassInstancePtr p_instance, GDExtensionConstStringNamePtr p_name) { return false; } static GDExtensionBool property_get_revert_bind(GDExtensionClassInstancePtr p_instance, GDExtensionConstStringNamePtr p_name, GDExtensionVariantPtr r_ret) { return false; } static GDExtensionBool validate_property_bind(GDExtensionClassInstancePtr p_instance, GDExtensionPropertyInfo *p_property) { return false; } static void to_string_bind(GDExtensionClassInstancePtr p_instance, GDExtensionBool *r_is_valid, GDExtensionStringPtr r_out) {} // The only reason this has to be held here, is when we return results of `_get_property_list` to Godot, we pass // pointers to strings in this list. They have to remain valid to pass the bridge, until the list is freed by Godot... ::godot::List<::godot::PropertyInfo> plist_owned; void _postinitialize(); Wrapped(const StringName p_godot_class); Wrapped(GodotObject *p_godot_object); virtual ~Wrapped() {} public: static StringName &get_class_static() { static StringName string_name = StringName("Wrapped"); return string_name; } uint64_t get_instance_id() const { return 0; } // Must be public but you should not touch this. GodotObject *_owner = nullptr; }; namespace internal { GDExtensionPropertyInfo *create_c_property_list(const ::godot::List<::godot::PropertyInfo> &plist_cpp, uint32_t *r_size); void free_c_property_list(GDExtensionPropertyInfo *plist); } // namespace internal } // namespace godot // Use this on top of your own classes. // Note: the trail of `***` is to keep sane diffs in PRs, because clang-format otherwise moves every `\` which makes // every line of the macro different #define GDCLASS(m_class, m_inherits) /***********************************************************************************************************************************************/ \ private: \ void operator=(const m_class &p_rval) {} \ friend class ::godot::ClassDB; \ \ protected: \ virtual const ::godot::StringName *_get_extension_class_name() const override { \ static ::godot::StringName string_name = get_class_static(); \ return &string_name; \ } \ \ virtual const GDExtensionInstanceBindingCallbacks *_get_bindings_callbacks() const override { \ return &_gde_binding_callbacks; \ } \ \ static void (*_get_bind_methods())() { \ return &m_class::_bind_methods; \ } \ \ static void (::godot::Wrapped::*_get_notification())(int) { \ return (void(::godot::Wrapped::*)(int)) & m_class::_notification; \ } \ \ static bool (::godot::Wrapped::*_get_set())(const ::godot::StringName &p_name, const ::godot::Variant &p_property) { \ return (bool(::godot::Wrapped::*)(const ::godot::StringName &p_name, const ::godot::Variant &p_property)) & m_class::_set; \ } \ \ static bool (::godot::Wrapped::*_get_get())(const ::godot::StringName &p_name, ::godot::Variant &r_ret) const { \ return (bool(::godot::Wrapped::*)(const ::godot::StringName &p_name, ::godot::Variant &r_ret) const) & m_class::_get; \ } \ \ static void (::godot::Wrapped::*_get_get_property_list())(::godot::List<::godot::PropertyInfo> * p_list) const { \ return (void(::godot::Wrapped::*)(::godot::List<::godot::PropertyInfo> * p_list) const) & m_class::_get_property_list; \ } \ \ static bool (::godot::Wrapped::*_get_property_can_revert())(const ::godot::StringName &p_name) const { \ return (bool(::godot::Wrapped::*)(const ::godot::StringName &p_name) const) & m_class::_property_can_revert; \ } \ \ static bool (::godot::Wrapped::*_get_property_get_revert())(const ::godot::StringName &p_name, ::godot::Variant &) const { \ return (bool(::godot::Wrapped::*)(const ::godot::StringName &p_name, ::godot::Variant &) const) & m_class::_property_get_revert; \ } \ \ static void (::godot::Wrapped::*_get_validate_property())(::godot::PropertyInfo & p_property) const { \ return (void(::godot::Wrapped::*)(::godot::PropertyInfo & p_property) const) & m_class::_validate_property; \ } \ \ static ::godot::String (::godot::Wrapped::*_get_to_string())() const { \ return (::godot::String(::godot::Wrapped::*)() const) & m_class::_to_string; \ } \ \ template \ static void register_virtuals() { \ m_inherits::register_virtuals(); \ } \ \ public: \ static void initialize_class() { \ static bool initialized = false; \ if (initialized) { \ return; \ } \ m_inherits::initialize_class(); \ if (m_class::_get_bind_methods() != m_inherits::_get_bind_methods()) { \ _bind_methods(); \ m_inherits::register_virtuals(); \ } \ initialized = true; \ } \ \ static ::godot::StringName &get_class_static() { \ static ::godot::StringName string_name = ::godot::StringName(#m_class); \ return string_name; \ } \ \ static ::godot::StringName &get_parent_class_static() { \ return m_inherits::get_class_static(); \ } \ \ static GDExtensionObjectPtr create(void *data) { \ m_class *new_object = memnew(m_class); \ return new_object->_owner; \ } \ \ static void notification_bind(GDExtensionClassInstancePtr p_instance, int32_t p_what, GDExtensionBool p_reversed) { \ if (p_instance && m_class::_get_notification()) { \ if (m_class::_get_notification() != m_inherits::_get_notification()) { \ m_class *cls = reinterpret_cast(p_instance); \ return cls->_notification(p_what); \ } \ m_inherits::notification_bind(p_instance, p_what, p_reversed); \ } \ } \ \ static GDExtensionBool set_bind(GDExtensionClassInstancePtr p_instance, GDExtensionConstStringNamePtr p_name, GDExtensionConstVariantPtr p_value) { \ if (p_instance && m_class::_get_set()) { \ if (m_class::_get_set() != m_inherits::_get_set()) { \ m_class *cls = reinterpret_cast(p_instance); \ return cls->_set(*reinterpret_cast(p_name), *reinterpret_cast(p_value)); \ } \ return m_inherits::set_bind(p_instance, p_name, p_value); \ } \ return false; \ } \ \ static GDExtensionBool get_bind(GDExtensionClassInstancePtr p_instance, GDExtensionConstStringNamePtr p_name, GDExtensionVariantPtr r_ret) { \ if (p_instance && m_class::_get_get()) { \ if (m_class::_get_get() != m_inherits::_get_get()) { \ m_class *cls = reinterpret_cast(p_instance); \ return cls->_get(*reinterpret_cast(p_name), *reinterpret_cast<::godot::Variant *>(r_ret)); \ } \ return m_inherits::get_bind(p_instance, p_name, r_ret); \ } \ return false; \ } \ \ static inline bool has_get_property_list() { \ return m_class::_get_get_property_list() && m_class::_get_get_property_list() != m_inherits::_get_get_property_list(); \ } \ \ static const GDExtensionPropertyInfo *get_property_list_bind(GDExtensionClassInstancePtr p_instance, uint32_t *r_count) { \ if (!p_instance) { \ if (r_count) \ *r_count = 0; \ return nullptr; \ } \ m_class *cls = reinterpret_cast(p_instance); \ ::godot::List<::godot::PropertyInfo> &plist_cpp = cls->plist_owned; \ ERR_FAIL_COND_V_MSG(!plist_cpp.is_empty(), nullptr, "Internal error, property list was not freed by engine!"); \ cls->_get_property_list(&plist_cpp); \ return ::godot::internal::create_c_property_list(plist_cpp, r_count); \ } \ \ static void free_property_list_bind(GDExtensionClassInstancePtr p_instance, const GDExtensionPropertyInfo *p_list) { \ if (p_instance) { \ m_class *cls = reinterpret_cast(p_instance); \ cls->plist_owned.clear(); \ /* TODO `GDExtensionClassFreePropertyList` is ill-defined, we need a non-const pointer to free this. */ \ ::godot::internal::free_c_property_list(const_cast(p_list)); \ } \ } \ \ static GDExtensionBool property_can_revert_bind(GDExtensionClassInstancePtr p_instance, GDExtensionConstStringNamePtr p_name) { \ if (p_instance && m_class::_get_property_can_revert()) { \ if (m_class::_get_property_can_revert() != m_inherits::_get_property_can_revert()) { \ m_class *cls = reinterpret_cast(p_instance); \ return cls->_property_can_revert(*reinterpret_cast(p_name)); \ } \ return m_inherits::property_can_revert_bind(p_instance, p_name); \ } \ return false; \ } \ \ static GDExtensionBool property_get_revert_bind(GDExtensionClassInstancePtr p_instance, GDExtensionConstStringNamePtr p_name, GDExtensionVariantPtr r_ret) { \ if (p_instance && m_class::_get_property_get_revert()) { \ if (m_class::_get_property_get_revert() != m_inherits::_get_property_get_revert()) { \ m_class *cls = reinterpret_cast(p_instance); \ return cls->_property_get_revert(*reinterpret_cast(p_name), *reinterpret_cast<::godot::Variant *>(r_ret)); \ } \ return m_inherits::property_get_revert_bind(p_instance, p_name, r_ret); \ } \ return false; \ } \ \ static GDExtensionBool validate_property_bind(GDExtensionClassInstancePtr p_instance, GDExtensionPropertyInfo *p_property) { \ bool ret = false; \ if (p_instance && m_class::_get_validate_property()) { \ ret = m_inherits::validate_property_bind(p_instance, p_property); \ if (m_class::_get_validate_property() != m_inherits::_get_validate_property()) { \ m_class *cls = reinterpret_cast(p_instance); \ ::godot::PropertyInfo info(p_property); \ cls->_validate_property(info); \ info._update(p_property); \ return true; \ } \ } \ return ret; \ } \ \ static void to_string_bind(GDExtensionClassInstancePtr p_instance, GDExtensionBool *r_is_valid, GDExtensionStringPtr r_out) { \ if (p_instance && m_class::_get_to_string()) { \ if (m_class::_get_to_string() != m_inherits::_get_to_string()) { \ m_class *cls = reinterpret_cast(p_instance); \ *reinterpret_cast<::godot::String *>(r_out) = cls->_to_string(); \ *r_is_valid = true; \ return; \ } \ m_inherits::to_string_bind(p_instance, r_is_valid, r_out); \ } \ } \ \ static void free(void *data, GDExtensionClassInstancePtr ptr) { \ if (ptr) { \ m_class *cls = reinterpret_cast(ptr); \ cls->~m_class(); \ ::godot::Memory::free_static(cls); \ } \ } \ \ static void *_gde_binding_create_callback(void *p_token, void *p_instance) { \ return nullptr; \ } \ \ static void _gde_binding_free_callback(void *p_token, void *p_instance, void *p_binding) { \ } \ \ static GDExtensionBool _gde_binding_reference_callback(void *p_token, void *p_instance, GDExtensionBool p_reference) { \ return true; \ } \ \ static constexpr GDExtensionInstanceBindingCallbacks _gde_binding_callbacks = { \ _gde_binding_create_callback, \ _gde_binding_free_callback, \ _gde_binding_reference_callback, \ }; // Don't use this for your classes, use GDCLASS() instead. #define GDEXTENSION_CLASS(m_class, m_inherits) \ private: \ void operator=(const m_class &p_rval) {} \ \ protected: \ virtual const GDExtensionInstanceBindingCallbacks *_get_bindings_callbacks() const override { \ return &_gde_binding_callbacks; \ } \ \ m_class(const char *p_godot_class) : m_inherits(p_godot_class) {} \ m_class(GodotObject *p_godot_object) : m_inherits(p_godot_object) {} \ \ static void (*_get_bind_methods())() { \ return nullptr; \ } \ \ static void (Wrapped::*_get_notification())(int) { \ return nullptr; \ } \ \ static bool (Wrapped::*_get_set())(const ::godot::StringName &p_name, const Variant &p_property) { \ return nullptr; \ } \ \ static bool (Wrapped::*_get_get())(const ::godot::StringName &p_name, Variant &r_ret) const { \ return nullptr; \ } \ \ static void (Wrapped::*_get_get_property_list())(List * p_list) const { \ return nullptr; \ } \ \ static bool (Wrapped::*_get_property_can_revert())(const ::godot::StringName &p_name) const { \ return nullptr; \ } \ \ static bool (Wrapped::*_get_property_get_revert())(const ::godot::StringName &p_name, Variant &) const { \ return nullptr; \ } \ \ static void (Wrapped::*_get_validate_property())(::godot::PropertyInfo & p_property) const { \ return nullptr; \ } \ \ static String (Wrapped::*_get_to_string())() const { \ return nullptr; \ } \ \ public: \ static void initialize_class() {} \ \ static ::godot::StringName &get_class_static() { \ static ::godot::StringName string_name = ::godot::StringName(#m_class); \ return string_name; \ } \ \ static ::godot::StringName &get_parent_class_static() { \ return m_inherits::get_class_static(); \ } \ \ static void *_gde_binding_create_callback(void *p_token, void *p_instance) { \ /* Do not call memnew here, we don't want the post-initializer to be called */ \ return new ("") m_class((GodotObject *)p_instance); \ } \ static void _gde_binding_free_callback(void *p_token, void *p_instance, void *p_binding) { \ /* Explicitly call the deconstructor to ensure proper lifecycle for non-trivial members */ \ reinterpret_cast(p_binding)->~m_class(); \ Memory::free_static(reinterpret_cast(p_binding)); \ } \ static GDExtensionBool _gde_binding_reference_callback(void *p_token, void *p_instance, GDExtensionBool p_reference) { \ return true; \ } \ static constexpr GDExtensionInstanceBindingCallbacks _gde_binding_callbacks = { \ _gde_binding_create_callback, \ _gde_binding_free_callback, \ _gde_binding_reference_callback, \ }; \ m_class() : m_class(#m_class) {} #endif // GODOT_WRAPPED_HPP