Implement IComponent::activateBus()

src/common/logging/vst3.cpp

@@ -114,6 +114,16 @@ void Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+void Vst3Logger::log_request(bool is_host_vst,
+                             const YaComponent::ActivateBus& request) {
+    log_request_base(is_host_vst, [&](auto& message) {
+        message << "<IComponent* #" << request.instance_id
+                << ">::activateBus(type = " << request.type
+                << ", dir = " << request.dir << ", index = " << request.index
+                << ", state = " << (request.state ? "true" : "false") << ">)";
+    });
+}
+
 void Vst3Logger::log_request(bool is_host_vst,
                              const YaPluginFactory::Construct&) {
     log_request_base(is_host_vst,

src/common/logging/vst3.h

@@ -64,6 +64,7 @@ class Vst3Logger {
     void log_request(bool is_host_vst, const YaComponent::GetBusCount&);
     void log_request(bool is_host_vst, const YaComponent::GetBusInfo&);
     void log_request(bool is_host_vst, const YaComponent::GetRoutingInfo&);
+    void log_request(bool is_host_vst, const YaComponent::ActivateBus&);
     void log_request(bool is_host_vst, const YaPluginFactory::Construct&);
     void log_request(bool is_host_vst, const YaPluginFactory::SetHostContext&);
     void log_request(bool is_host_vst, const WantsConfiguration&);

src/common/serialization/vst3.h

@@ -65,6 +65,7 @@ using ControlRequest = std::variant<YaComponent::Construct,
                                     YaComponent::GetBusCount,
                                     YaComponent::GetBusInfo,
                                     YaComponent::GetRoutingInfo,
+                                    YaComponent::ActivateBus,
                                     YaPluginFactory::Construct,
                                     YaPluginFactory::SetHostContext>;
 

src/common/serialization/vst3/component.h

@@ -301,6 +301,31 @@ class YaComponent : public Steinberg::Vst::IComponent {
     virtual tresult PLUGIN_API
     getRoutingInfo(Steinberg::Vst::RoutingInfo& inInfo,
                    Steinberg::Vst::RoutingInfo& outInfo /*out*/) override = 0;
+
+    /**
+     * Message to pass through a call to `IComponent::activateBus(type, dir,
+     * index, state)` to the Wine plugin host.
+     */
+    struct ActivateBus {
+        using Response = UniversalTResult;
+
+        native_size_t instance_id;
+
+        Steinberg::Vst::MediaType type;
+        Steinberg::Vst::BusDirection dir;
+        int32 index;
+        TBool state;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(instance_id);
+            s.value4b(type);
+            s.value4b(dir);
+            s.value4b(index);
+            s.value1b(state);
+        }
+    };
+
     virtual tresult PLUGIN_API activateBus(Steinberg::Vst::MediaType type,
                                            Steinberg::Vst::BusDirection dir,
                                            int32 index,

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

@@ -123,9 +123,14 @@ YaComponentPluginImpl::activateBus(Steinberg::Vst::MediaType type,
                                    Steinberg::Vst::BusDirection dir,
                                    int32 index,
                                    TBool state) {
-    // TODO: Implement
-    bridge.logger.log("TODO: IComponent::activateBus()");
-    return Steinberg::kNotImplemented;
+    return bridge
+        .send_message(
+            YaComponent::ActivateBus{.instance_id = arguments.instance_id,
+                                     .type = type,
+                                     .dir = dir,
+                                     .index = index,
+                                     .state = state})
+        .native();
 }
 
 tresult PLUGIN_API YaComponentPluginImpl::setActive(TBool state) {

src/wine-host/bridges/vst3.cpp

@@ -142,6 +142,12 @@ void Vst3Bridge::run() {
                     .updated_in_info = request.in_info,
                     .updated_out_info = request.out_info};
             },
+            [&](const YaComponent::ActivateBus& request)
+                -> YaComponent::ActivateBus::Response {
+                return component_instances[request.instance_id]
+                    .component->activateBus(request.type, request.dir,
+                                            request.index, request.state);
+            },
             [&](const YaPluginFactory::Construct&)
                 -> YaPluginFactory::Construct::Response {
                 return YaPluginFactory::ConstructArgs(