Implement IEditController::setComponentHandler()

src/common/logging/vst3.cpp

@@ -391,6 +391,21 @@ bool Vst3Logger::log_request(
     });
 }
 
+bool Vst3Logger::log_request(
+    bool is_host_vst,
+    const YaEditController::SetComponentHandler& request) {
+    return log_request_base(is_host_vst, [&](auto& message) {
+        message << request.instance_id
+                << ": IEditController::setComponentHandler(handler = ";
+        if (request.component_handler_proxy_args) {
+            message << "<IComponentHandler*>";
+        } else {
+            message << "<nullptr>";
+        }
+        message << ")";
+    });
+}
+
 bool Vst3Logger::log_request(bool is_host_vst,
                              const YaPluginBase::Initialize& request) {
     return log_request_base(is_host_vst, [&](auto& message) {

src/common/logging/vst3.h

@@ -102,6 +102,8 @@ class Vst3Logger {
                      const YaEditController::GetParamNormalized&);
     bool log_request(bool is_host_vst,
                      const YaEditController::SetParamNormalized&);
+    bool log_request(bool is_host_vst,
+                     const YaEditController::SetComponentHandler&);
     bool log_request(bool is_host_vst, const YaPluginBase::Initialize&);
     bool log_request(bool is_host_vst, const YaPluginBase::Terminate&);
     bool log_request(bool is_host_vst, const YaPluginFactory::Construct&);

src/common/serialization/vst3.h

@@ -87,6 +87,7 @@ using ControlRequest = std::variant<Vst3PluginProxy::Construct,
                                     YaEditController::PlainParamToNormalized,
                                     YaEditController::GetParamNormalized,
                                     YaEditController::SetParamNormalized,
+                                    YaEditController::SetComponentHandler,
                                     YaPluginBase::Initialize,
                                     YaPluginBase::Terminate,
                                     YaPluginFactory::Construct,

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

@@ -16,10 +16,12 @@
 
 #pragma once
 
+#include <bitsery/ext/std_optional.h>
 #include <pluginterfaces/vst/ivsteditcontroller.h>
 
 #include "../../common.h"
 #include "../base.h"
+#include "../component-handler-proxy.h"
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
@@ -328,6 +330,35 @@ class YaEditController : public Steinberg::Vst::IEditController {
     virtual tresult PLUGIN_API
     setParamNormalized(Steinberg::Vst::ParamID id,
                        Steinberg::Vst::ParamValue value) override = 0;
+
+    /**
+     * Message to pass through a call to
+     * `IEditController::setComponentHandler(handler)` to the Wine plugin host.
+     * Like when creating a proxy for a plugin object, we'll read all supported
+     * interfaces form the component handler instance passed by the host. We'll
+     * then create a perfect proxy on the plugin side, that can do callbacks to
+     * the actual component handler passed by the host.
+     */
+    struct SetComponentHandler {
+        using Response = UniversalTResult;
+
+        native_size_t instance_id;
+
+        /**
+         * Arguments for instantiating the proxy object. Even though it should
+         * never happen, if the host passed a null pointer to this function
+         * we'll mimic that as well.
+         */
+        std::optional<Vst3ComponentHandlerProxy::ConstructArgs>
+            component_handler_proxy_args;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(instance_id);
+            s.ext(component_handler_proxy_args, bitsery::ext::StdOptional{});
+        }
+    };
+
     virtual tresult PLUGIN_API setComponentHandler(
         Steinberg::Vst::IComponentHandler* handler) override = 0;
     virtual Steinberg::IPlugView* PLUGIN_API