Add CLAP plugin destroying

Everything else is still a stub, but at least the lifecycle now works
correctly.

src/common/logging/clap.cpp

@@ -38,16 +38,22 @@ bool ClapLogger::log_request(bool is_host_plugin,
     });
 }
 
+bool ClapLogger::log_request(bool is_host_plugin,
+                             const clap::plugin::Destroy& request) {
+    return log_request_base(is_host_plugin, [&](auto& message) {
+        message << request.instance_id << ": clap_plugin::destroy()";
+    });
+}
+
 bool ClapLogger::log_request(bool is_host_plugin, const WantsConfiguration&) {
     return log_request_base(is_host_plugin, [&](auto& message) {
         message << "Requesting <Configuration>";
     });
 }
 
-// void ClapLogger::log_response(bool is_host_plugin, const Ack&) {
-//     log_response_base(is_host_plugin, [&](auto& message) { message << "ACK";
-//     });
-// }
+void ClapLogger::log_response(bool is_host_plugin, const Ack&) {
+    log_response_base(is_host_plugin, [&](auto& message) { message << "ACK"; });
+}
 
 void ClapLogger::log_response(
     bool is_host_plugin,

src/common/logging/clap.h

@@ -47,6 +47,7 @@ class ClapLogger {
 
     bool log_request(bool is_host_plugin, const clap::plugin_factory::List&);
     bool log_request(bool is_host_plugin, const clap::plugin_factory::Create&);
+    bool log_request(bool is_host_plugin, const clap::plugin::Destroy&);
 
     // TODO: Audio thread requests
     // bool log_request(bool is_host_plugin,
@@ -54,7 +55,7 @@ class ClapLogger {
 
     bool log_request(bool is_host_plugin, const WantsConfiguration&);
 
-    // void log_response(bool is_host_plugin, const Ack&);
+    void log_response(bool is_host_plugin, const Ack&);
     void log_response(bool is_host_plugin,
                       const clap::plugin_factory::ListResponse&);
     void log_response(bool is_host_plugin,

src/common/serialization/clap.h

@@ -41,7 +41,8 @@
 //        serialize this without it.
 using ClapMainThreadControlRequest = std::variant<WantsConfiguration,
                                                   clap::plugin_factory::List,
-                                                  clap::plugin_factory::Create>;
+                                                  clap::plugin_factory::Create,
+                                                  clap::plugin::Destroy>;
 
 template <typename S>
 void serialize(S& s, ClapMainThreadControlRequest& payload) {

src/common/serialization/clap/plugin.h

@@ -24,6 +24,7 @@
 #include <clap/plugin.h>
 
 #include "../../bitsery/ext/in-place-optional.h"
+#include "../common.h"
 
 // Serialization messages for `clap/plugin.h`
 
@@ -104,6 +105,22 @@ struct Descriptor {
     mutable clap_plugin_descriptor_t clap_descriptor;
 };
 
+/**
+ * Message struct for `clap_plugin::destroy()`. The Wine plugin host should
+ * clean up the plugin, and everything is also cleaned up on the plugin side
+ * after receiving acknowledgement
+ */
+struct Destroy {
+    using Response = Ack;
+
+    native_size_t instance_id;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(instance_id);
+    }
+};
+
 }  // namespace plugin
 }  // namespace clap