Implement IEditController2::openAboutBox

With this IEditController2 has been fully implemented.

README.md

@@ -16,9 +16,8 @@ This branch is still very far removed from being in a usable state. Below is an
 incomplete list of things that still have to be done before this can be used:
 
 - Interfaces left to implement:
-  - `IEditController2`
-  - All other mandatory interfaces
-  - All other optional interfaces
+  - All other mandatory and optional VST 3.0 interfaces
+  - All interfaces introduced after that
 - Fully implemented: see [this
   document](https://github.com/robbert-vdh/yabridge/tree/feature/vst3/src/common/serialization/vst3/README.md)
 - Update yabridgectl to handle buth VST2 and VST3 plugins.

src/common/logging/vst3.cpp

@@ -271,6 +271,15 @@ bool Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+bool Vst3Logger::log_request(bool is_host_vst,
+                             const YaEditController2::OpenAboutBox& request) {
+    return log_request_base(is_host_vst, [&](auto& message) {
+        message << request.instance_id
+                << ": IEditController2::openAboutBox(onlyCheck = "
+                << (request.only_check ? "true" : "false") << ")";
+    });
+}
+
 bool Vst3Logger::log_request(
     bool is_host_vst,
     const YaPlugView::IsPlatformTypeSupported& request) {

src/common/logging/vst3.h

@@ -90,6 +90,7 @@ class Vst3Logger {
     bool log_request(bool is_host_vst, const YaEditController::CreateView&);
     bool log_request(bool is_host_vst, const YaEditController2::SetKnobMode&);
     bool log_request(bool is_host_vst, const YaEditController2::OpenHelp&);
+    bool log_request(bool is_host_vst, const YaEditController2::OpenAboutBox&);
     bool log_request(bool is_host_vst,
                      const YaPlugView::IsPlatformTypeSupported&);
     bool log_request(bool is_host_vst, const YaPlugView::Attached&);

src/common/serialization/vst3.h

@@ -83,6 +83,7 @@ using ControlRequest = std::variant<Vst3PlugViewProxy::Destruct,
                                     YaEditController::CreateView,
                                     YaEditController2::SetKnobMode,
                                     YaEditController2::OpenHelp,
+                                    YaEditController2::OpenAboutBox,
                                     YaPlugView::IsPlatformTypeSupported,
                                     YaPlugView::Attached,
                                     YaPlugView::Removed,

src/common/serialization/vst3/plugin/edit-controller-2.h

@@ -101,6 +101,25 @@ class YaEditController2 : public Steinberg::Vst::IEditController2 {
     };
 
     virtual tresult PLUGIN_API openHelp(TBool onlyCheck) override = 0;
+
+    /**
+     * Message to pass through a call to
+     * `IEditController2::openAboutBox(only_check)` to the Wine plugin host.
+     */
+    struct OpenAboutBox {
+        using Response = UniversalTResult;
+
+        native_size_t instance_id;
+
+        TBool only_check;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(instance_id);
+            s.value1b(only_check);
+        }
+    };
+
     virtual tresult PLUGIN_API openAboutBox(TBool onlyCheck) override = 0;
 
    protected:

src/plugin/bridges/vst3-impls/plugin-proxy.cpp

@@ -404,9 +404,8 @@ tresult PLUGIN_API Vst3PluginProxyImpl::openHelp(TBool onlyCheck) {
 }
 
 tresult PLUGIN_API Vst3PluginProxyImpl::openAboutBox(TBool onlyCheck) {
-    // TODO: Implement
-    bridge.logger.log("TODO: IEditController2::openAboutBox()");
-    return Steinberg::kNotImplemented;
+    return bridge.send_message(YaEditController2::OpenAboutBox{
+        .instance_id = instance_id(), .only_check = onlyCheck});
 }
 
 tresult PLUGIN_API Vst3PluginProxyImpl::initialize(FUnknown* context) {

src/wine-host/bridges/vst3.cpp

@@ -346,6 +346,11 @@ void Vst3Bridge::run() {
                 return object_instances[request.instance_id]
                     .edit_controller_2->openHelp(request.only_check);
             },
+            [&](const YaEditController2::OpenAboutBox& request)
+                -> YaEditController2::OpenAboutBox::Response {
+                return object_instances[request.instance_id]
+                    .edit_controller_2->openAboutBox(request.only_check);
+            },
             [&](const YaPlugView::IsPlatformTypeSupported& request)
                 -> YaPlugView::IsPlatformTypeSupported::Response {
                 // The host will of course want to pass an X11 window ID for the