Log unknown interfaces in IComponent::initialize()

src/common/serialization/vst3/component.h

@@ -128,7 +128,7 @@ class YaComponent : public Steinberg::Vst::IComponent {
     virtual tresult PLUGIN_API initialize(FUnknown* context) override = 0;
 
     /**
-     * Message to pass through a call to `IComponent::terminate()` to the Wine
+     * Message to pass through a call to `IPluginBase::terminate()` to the Wine
      * plugin host.
      */
     struct Terminate {

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

@@ -35,6 +35,28 @@ YaComponentPluginImpl::queryInterface(const ::Steinberg::TUID _iid,
 }
 
 tresult PLUGIN_API YaComponentPluginImpl::initialize(FUnknown* context) {
+    // This `context` will likely be an `IHostApplication`. If it is, we will
+    // store it here, and we'll proxy through all calls to it made from the Wine
+    // side. Otherwise we'll still call `IPluginBase::initialize()` but with a
+    // null pointer instead.
+    host_application_context = context;
+    if (host_application_context) {
+        // TODO: Init with `YaHostApplication`
+    } else {
+        context->iid;
+
+        char iid_string[128] = "<invalid_pointer>";
+        if (context) {
+            context->iid.print(iid_string,
+                               Steinberg::FUID::UIDPrintStyle::kCLASS_UID);
+        }
+
+        bridge.logger.log("[Unknown interface] In IPluginBase::initialize(): " +
+                          std::string(iid_string));
+
+        // TODO: Init with null pointer
+    }
+
     // TODO: Implement
     return Steinberg::kNotImplemented;
 }

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

@@ -16,6 +16,8 @@
 
 #pragma once
 
+#include <pluginterfaces/vst/ivsthostapplication.h>
+
 #include "../vst3.h"
 
 class YaComponentPluginImpl : public YaComponent {
@@ -61,4 +63,11 @@ class YaComponentPluginImpl : public YaComponent {
 
    private:
     Vst3PluginBridge& bridge;
+
+    /**
+     * An `IHostApplication` instance if we get one through
+     * `IPluginBase::initialize()`.
+     */
+    Steinberg::FUnknownPtr<Steinberg::Vst::IHostApplication>
+        host_application_context;
 };

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

@@ -55,7 +55,9 @@ YaPluginFactoryPluginImpl::createInstance(Steinberg::FIDString cid,
             iid.print(iid_string, Steinberg::FUID::UIDPrintStyle::kCLASS_UID);
         }
 
-        bridge.logger.log("[Unknown interface] " + std::string(iid_string));
+        bridge.logger.log(
+            "[Unknown interface] In IPluginFactory::createInstance(): " +
+            std::string(iid_string));
 
         return Steinberg::kNotImplemented;
     }