Implement IPlugView::onWheel()

src/common/logging/vst3.cpp

@@ -264,6 +264,15 @@ bool Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+bool Vst3Logger::log_request(bool is_host_vst,
+                             const YaPlugView::OnWheel& request) {
+    return log_request_base(is_host_vst, [&](auto& message) {
+        message << request.owner_instance_id
+                << ": IPlugView::onWheel(distance = " << request.distance
+                << ")";
+    });
+}
+
 bool Vst3Logger::log_request(bool is_host_vst,
                              const YaPlugView::GetSize& request) {
     return log_request_base(is_host_vst, [&](auto& message) {

src/common/logging/vst3.h

@@ -91,6 +91,7 @@ class Vst3Logger {
                      const YaPlugView::IsPlatformTypeSupported&);
     bool log_request(bool is_host_vst, const YaPlugView::Attached&);
     bool log_request(bool is_host_vst, const YaPlugView::Removed&);
+    bool log_request(bool is_host_vst, const YaPlugView::OnWheel&);
     bool log_request(bool is_host_vst, const YaPlugView::GetSize&);
     bool log_request(bool is_host_vst, const YaPluginBase::Initialize&);
     bool log_request(bool is_host_vst, const YaPluginBase::Terminate&);

src/common/serialization/vst3.h

@@ -80,6 +80,7 @@ using ControlRequest = std::variant<Vst3PlugViewProxy::Destruct,
                                     YaPlugView::IsPlatformTypeSupported,
                                     YaPlugView::Attached,
                                     YaPlugView::Removed,
+                                    YaPlugView::OnWheel,
                                     YaPlugView::GetSize,
                                     YaPluginBase::Initialize,
                                     YaPluginBase::Terminate,

src/common/serialization/vst3/plug-view/plug-view.h

@@ -129,6 +129,25 @@ class YaPlugView : public Steinberg::IPlugView {
     };
 
     virtual tresult PLUGIN_API removed() override = 0;
+
+    /**
+     * Message to pass through a call to `IPlugView::onWheel(distance)` to the
+     * Wine plugin host.
+     */
+    struct OnWheel {
+        using Response = UniversalTResult;
+
+        native_size_t owner_instance_id;
+
+        float distance;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(owner_instance_id);
+            s.value4b(distance);
+        }
+    };
+
     virtual tresult PLUGIN_API onWheel(float distance) override = 0;
     virtual tresult PLUGIN_API onKeyDown(char16 key,
                                          int16 keyCode,