Implement IUnitHandler::notifyUnitSelection

src/common/logging/vst3.cpp

@@ -700,6 +700,16 @@ bool Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+bool Vst3Logger::log_request(
+    bool is_host_vst,
+    const YaUnitHandler::NotifyUnitSelection& request) {
+    return log_request_base(is_host_vst, [&](auto& message) {
+        message << request.owner_instance_id
+                << ": IUnitHandler::notifyUnitSelection(unitId = "
+                << request.unit_id << ")";
+    });
+}
+
 void Vst3Logger::log_response(bool is_host_vst, const Ack&) {
     log_response_base(is_host_vst, [&](auto& message) { message << "ACK"; });
 }

src/common/logging/vst3.h

@@ -139,6 +139,8 @@ class Vst3Logger {
                      const YaComponentHandler::RestartComponent&);
     bool log_request(bool is_host_vst, const YaHostApplication::GetName&);
     bool log_request(bool is_host_vst, const YaPlugFrame::ResizeView&);
+    bool log_request(bool is_host_vst,
+                     const YaUnitHandler::NotifyUnitSelection&);
 
     void log_response(bool is_host_vst, const Ack&);
     void log_response(

src/common/serialization/vst3.h

@@ -153,7 +153,8 @@ using CallbackRequest = std::variant<WantsConfiguration,
                                      // there
                                      YaConnectionPoint::Notify,
                                      YaHostApplication::GetName,
-                                     YaPlugFrame::ResizeView>;
+                                     YaPlugFrame::ResizeView,
+                                     YaUnitHandler::NotifyUnitSelection>;
 
 template <typename S>
 void serialize(S& s, CallbackRequest& payload) {

src/common/serialization/vst3/component-handler/unit-handler.h

@@ -61,6 +61,25 @@ class YaUnitHandler : public Steinberg::Vst::IUnitHandler {
 
     inline bool supported() const { return arguments.supported; }
 
+    /**
+     * Message to pass through a call to
+     * `IUnitHandler::notifyUnitSelection(unit_id)` to the unit handler provided
+     * by the host.
+     */
+    struct NotifyUnitSelection {
+        using Response = UniversalTResult;
+
+        native_size_t owner_instance_id;
+
+        Steinberg::Vst::UnitID unit_id;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(owner_instance_id);
+            s.value4b(unit_id);
+        }
+    };
+
     virtual tresult PLUGIN_API
     notifyUnitSelection(Steinberg::Vst::UnitID unitId) override = 0;
     virtual tresult PLUGIN_API

src/plugin/bridges/vst3-impls/plugin-factory.h

@@ -28,8 +28,8 @@ class YaPluginFactoryImpl : public YaPluginFactory {
                                       void** obj) override;
     tresult PLUGIN_API setHostContext(Steinberg::FUnknown* context) override;
 
-    // The following pointers are cast from `host_context` if `setHostContext()`
-    // has been called
+    // The following pointers are cast from `host_context` if
+    // `IPluginFactory3::setHostContext()` has been called
 
     Steinberg::FUnknownPtr<Steinberg::Vst::IHostApplication> host_application;
 

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

@@ -357,6 +357,10 @@ tresult PLUGIN_API Vst3PluginProxyImpl::setComponentHandler(
         // this component handler
         component_handler = handler;
 
+        // Automatically converted smart pointers for when the plugin performs a
+        // callback later
+        unit_handler = component_handler;
+
         return bridge.send_message(YaEditController::SetComponentHandler{
             .instance_id = instance_id(),
             .component_handler_proxy_args =

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

@@ -152,11 +152,16 @@ class Vst3PluginProxyImpl : public Vst3PluginProxy {
      */
     Vst3PlugViewProxyImpl* last_created_plug_view = nullptr;
 
-    // The following pointers are cast from `host_context` if `setHostContext()`
-    // has been called
+    // The following pointers are cast from `host_context` if
+    // `IPluginBase::initialize()` has been called
 
     Steinberg::FUnknownPtr<Steinberg::Vst::IHostApplication> host_application;
 
+    // The following pointers are cast from `component_handler` if
+    // `IEditController::setComponentHandler()` has been called
+
+    Steinberg::FUnknownPtr<Steinberg::Vst::IUnitHandler> unit_handler;
+
    private:
     Vst3PluginBridge& bridge;
 

src/plugin/bridges/vst3.cpp

@@ -145,6 +145,12 @@ Vst3PluginBridge::Vst3PluginBridge()
                     return plug_view->plug_frame->resizeView(plug_view,
                                                              &request.new_size);
                 },
+                [&](const YaUnitHandler::NotifyUnitSelection& request)
+                    -> YaUnitHandler::NotifyUnitSelection::Response {
+                    return plugin_proxies.at(request.owner_instance_id)
+                        .get()
+                        .unit_handler->notifyUnitSelection(request.unit_id);
+                },
             });
     });
 }

src/wine-host/bridges/vst3-impls/component-handler-proxy.cpp

@@ -69,9 +69,8 @@ Vst3ComponentHandlerProxyImpl::restartComponent(int32 flags) {
 
 tresult PLUGIN_API Vst3ComponentHandlerProxyImpl::notifyUnitSelection(
     Steinberg::Vst::UnitID unitId) {
-    // TODO: Implement
-    std::cerr << "TODO: IUnitHandler::notifyUnitSelection" << std::endl;
-    return Steinberg::kNotImplemented;
+    return bridge.send_message(YaUnitHandler::NotifyUnitSelection{
+        .owner_instance_id = owner_instance_id(), .unit_id = unitId});
 }
 
 tresult PLUGIN_API Vst3ComponentHandlerProxyImpl::notifyProgramListChange(