Tweak travesty headers as needed by hosts for plugin scanning

Signed-off-by: falkTX <falktx@falktx.com>

distrho/src/travesty/base.h

@@ -207,4 +207,18 @@ uint32_t v3_cpp_obj_unref(T** obj)
 	return static_cast<v3_funknown*>(static_cast<void*>(*obj))->unref(obj);
 }
 
+template<class T> static inline
+v3_result v3_cpp_obj_initialize(T** obj, v3_funknown** context)
+{
+	return static_cast<v3_plugin_base*>(
+		static_cast<void*>(static_cast<uint8_t*>(static_cast<void*>(*obj)) + sizeof(void*)*3))->initialize(obj, context);
+}
+
+template<class T> static inline
+v3_result v3_cpp_obj_terminate(T** obj)
+{
+	return static_cast<v3_plugin_base*>(
+		static_cast<void*>(static_cast<uint8_t*>(static_cast<void*>(*obj)) + sizeof(void*)*3))->terminate(obj);
+}
+
 #endif

distrho/src/travesty/events.h

@@ -143,4 +143,16 @@ struct v3_event_list {
 static constexpr const v3_tuid v3_event_list_iid =
 	V3_ID(0x3A2C4214, 0x346349FE, 0xB2C4F397, 0xB9695A44);
 
+#ifdef __cplusplus
+
+/**
+ * C++ variants
+ */
+
+struct v3_event_list_cpp : v3_funknown {
+	v3_event_list list;
+};
+
+#endif
+
 #include "align_pop.h"

distrho/src/travesty/factory.h

@@ -122,4 +122,26 @@ struct v3_plugin_factory_cpp : v3_funknown {
 	v3_plugin_factory_3 v3;
 };
 
+template<> inline
+constexpr v3_plugin_factory_2* v3_cpp_obj(v3_plugin_factory_2** obj)
+{
+	/**
+	 * this ugly piece of code is required due to C++ assuming `reinterpret_cast` by default,
+	 * but we need everything to be `static_cast` for it to be `constexpr` compatible.
+	 */
+	return static_cast<v3_plugin_factory_2*>(
+		static_cast<void*>(static_cast<uint8_t*>(static_cast<void*>(*obj)) + sizeof(void*)*7));
+}
+
+template<> inline
+constexpr v3_plugin_factory_3* v3_cpp_obj(v3_plugin_factory_3** obj)
+{
+	/**
+	 * this ugly piece of code is required due to C++ assuming `reinterpret_cast` by default,
+	 * but we need everything to be `static_cast` for it to be `constexpr` compatible.
+	 */
+	return static_cast<v3_plugin_factory_3*>(
+		static_cast<void*>(static_cast<uint8_t*>(static_cast<void*>(*obj)) + sizeof(void*)*8));
+}
+
 #endif