Implement plugin side of IPluginBase::initialize()

src/common/logging/vst3.cpp

@@ -52,6 +52,19 @@ void Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+void Vst3Logger::log_request(bool is_host_vst,
+                             const YaComponent::Initialize& request) {
+    log_request_base(is_host_vst, [&](auto& message) {
+        message << "<IComponent* #" << request.instance_id << ">::initialize(";
+        if (request.host_application_context_args) {
+            message << "IHostApplication*";
+        } else {
+            message << "nullptr";
+        }
+        message << ")";
+    });
+}
+
 void Vst3Logger::log_request(bool is_host_vst,
                              const YaComponent::Terminate& request) {
     log_request_base(is_host_vst, [&](auto& message) {

src/common/logging/vst3.h

@@ -58,6 +58,7 @@ class Vst3Logger {
 
     void log_request(bool is_host_vst, const YaComponent::Construct&);
     void log_request(bool is_host_vst, const YaComponent::Destruct&);
+    void log_request(bool is_host_vst, const YaComponent::Initialize&);
     void log_request(bool is_host_vst, const YaComponent::Terminate&);
     void log_request(bool is_host_vst, const YaPluginFactory::Construct&);
     void log_request(bool is_host_vst, const WantsConfiguration&);

src/common/serialization/vst3.h

@@ -59,6 +59,7 @@ struct WantsConfiguration {
  */
 using ControlRequest = std::variant<YaComponent::Construct,
                                     YaComponent::Destruct,
+                                    YaComponent::Initialize,
                                     YaComponent::Terminate,
                                     YaPluginFactory::Construct>;
 

src/common/serialization/vst3/component.h

@@ -27,6 +27,7 @@
 
 #include "../common.h"
 #include "base.h"
+#include "host-application.h"
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
@@ -125,6 +126,29 @@ class YaComponent : public Steinberg::Vst::IComponent {
     DECLARE_FUNKNOWN_METHODS
 
     // From `IPluginBase`
+
+    /**
+     * Message to pass through a call to `IPluginBase::initialize()` to the Wine
+     * plugin host. if we pass an `IHostApplication` instance, then a proxy
+     * `YaHostApplication` should be created and passed as an argument to
+     * `IPluginBase::initialize()`. If this is absent a null pointer should be
+     * passed. The lifetime of this `YaHostApplication` object should be bound
+     * to the `IComponent` we are proxying.
+     */
+    struct Initialize {
+        using Response = UniversalTResult;
+
+        native_size_t instance_id;
+        std::optional<YaHostApplication::ConstructArgs>
+            host_application_context_args;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(instance_id);
+            s.ext(host_application_context_args, bitsery::ext::StdOptional{});
+        }
+    };
+
     virtual tresult PLUGIN_API initialize(FUnknown* context) override = 0;
 
     /**

src/common/serialization/vst3/host-application.h

@@ -68,7 +68,7 @@ class YaHostApplication : public Steinberg::Vst::IHostApplication {
         void serialize(S& s) {
             s.value8b(component_instance_id);
             s.ext(name, bitsery::ext::StdOptional{},
-                  [](S& s, std::string& name) {
+                  [](S& s, std::u16string& name) {
                       s.text2b(name, std::extent_v<Steinberg::Vst::String128>);
                   });
         }
@@ -78,9 +78,9 @@ class YaHostApplication : public Steinberg::Vst::IHostApplication {
      * Instantiate this instance with arguments read from an actual host
      * context.
      *
-     * @note Since this is passed as part of ``IPluginBase::intialize()` and
+     * @note Since this is passed as part of `IPluginBase::intialize()` and
-     *   `IPluginFactory3::setHostContext()``, there are no direct `Construct`
+     *   `IPluginFactory3::setHostContext()`, there are no direct `Construct` or
-     *   or `Destruct` messages. This object's lifetime is bound to that of the
+     *   `Destruct` messages. This object's lifetime is bound to that of the
      *   objects they are passed to. If those objects get dropped, then the host
      *   contexts should also be dropped.
      *

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

@@ -45,18 +45,24 @@ tresult PLUGIN_API YaComponentPluginImpl::initialize(FUnknown* context) {
     // side. Otherwise we'll still call `IPluginBase::initialize()` but with a
     // null pointer instead.
     host_application_context = context;
+
+    std::optional<YaHostApplication::ConstructArgs>
+        host_application_context_args = std::nullopt;
     if (host_application_context) {
-        // TODO: Init with `YaHostApplication`
+        host_application_context_args = YaHostApplication::ConstructArgs(
+            host_application_context, arguments.instance_id);
     } else {
         bridge.logger.log_unknown_interface(
             "In IPluginBase::initialize()",
             context ? std::optional(context->iid) : std::nullopt);
-
-        // TODO: Init with null pointer
     }
 
-    // TODO: Implement
+    return bridge
-    return Steinberg::kNotImplemented;
+        .send_message(YaComponent::Initialize{
+            .instance_id = arguments.instance_id,
+            .host_application_context_args =
+                std::move(host_application_context_args)})
+        .native();
 }
 
 tresult PLUGIN_API YaComponentPluginImpl::terminate() {

src/wine-host/bridges/vst3.cpp

@@ -72,6 +72,14 @@ void Vst3Bridge::run() {
 
                 return Ack{};
             },
+            [&](const YaComponent::Initialize& request)
+                -> YaComponent::Initialize::Response {
+                // TODO: If `request.host_context_args` has a value, we should
+                //       initialize a proxy object and pass a pointer to that
+                //       instead
+                return component_instances[request.instance_id]->initialize(
+                    nullptr);
+            },
             [&](const YaComponent::Terminate& request)
                 -> YaComponent::Terminate::Response {
                 return component_instances[request.instance_id]->terminate();