Implement IUnitInfo::getProgramListCount

src/common/logging/vst3.cpp

@@ -446,6 +446,13 @@ bool Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+bool Vst3Logger::log_request(bool is_host_vst,
+                             const YaUnitInfo::GetProgramListCount& request) {
+    return log_request_base(is_host_vst, [&](auto& message) {
+        message << request.instance_id << ": IUnitInfo::getProgramListCount()";
+    });
+}
+
 bool Vst3Logger::log_request(
     bool is_host_vst,
     const YaAudioProcessor::SetBusArrangements& request) {

src/common/logging/vst3.h

@@ -110,6 +110,7 @@ class Vst3Logger {
     bool log_request(bool is_host_vst, const YaPluginFactory::SetHostContext&);
     bool log_request(bool is_host_vst, const YaUnitInfo::GetUnitCount&);
     bool log_request(bool is_host_vst, const YaUnitInfo::GetUnitInfo&);
+    bool log_request(bool is_host_vst, const YaUnitInfo::GetProgramListCount&);
 
     bool log_request(bool is_host_vst,
                      const YaAudioProcessor::SetBusArrangements&);

src/common/serialization/vst3.h

@@ -101,7 +101,8 @@ using ControlRequest = std::variant<Vst3PlugViewProxy::Destruct,
                                     YaPluginFactory::Construct,
                                     YaPluginFactory::SetHostContext,
                                     YaUnitInfo::GetUnitCount,
-                                    YaUnitInfo::GetUnitInfo>;
+                                    YaUnitInfo::GetUnitInfo,
+                                    YaUnitInfo::GetProgramListCount>;
 
 template <typename S>
 void serialize(S& s, ControlRequest& payload) {

src/common/serialization/vst3/plugin/unit-info.h

@@ -115,6 +115,22 @@ class YaUnitInfo : public Steinberg::Vst::IUnitInfo {
     virtual tresult PLUGIN_API
     getUnitInfo(int32 unitIndex,
                 Steinberg::Vst::UnitInfo& info /*out*/) override = 0;
+
+    /**
+     * Message to pass through a call to `IUnitInfo::getProgramListCount()` to
+     * the Wine plugin host.
+     */
+    struct GetProgramListCount {
+        using Response = PrimitiveWrapper<int32>;
+
+        native_size_t instance_id;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(instance_id);
+        }
+    };
+
     virtual int32 PLUGIN_API getProgramListCount() override = 0;
     virtual tresult PLUGIN_API getProgramListInfo(
         int32 listIndex,

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

@@ -458,9 +458,8 @@ Vst3PluginProxyImpl::getUnitInfo(int32 unitIndex,
 }
 
 int32 PLUGIN_API Vst3PluginProxyImpl::getProgramListCount() {
-    // TODO: Implement
-    bridge.logger.log("TODO: IUnitInfo::getProgramListCount()");
-    return Steinberg::kNotImplemented;
+    return bridge.send_message(
+        YaUnitInfo::GetProgramListCount{.instance_id = instance_id()});
 }
 
 tresult PLUGIN_API Vst3PluginProxyImpl::getProgramListInfo(

src/wine-host/bridges/vst3.cpp

@@ -581,6 +581,11 @@ void Vst3Bridge::run() {
                 return YaUnitInfo::GetUnitInfoResponse{.result = result,
                                                        .info = info};
             },
+            [&](const YaUnitInfo::GetProgramListCount& request)
+                -> YaUnitInfo::GetProgramListCount::Response {
+                return object_instances[request.instance_id]
+                    .unit_info->getProgramListCount();
+            },
         });
 }