Add a proxy class for IUnitData

src/common/serialization/vst3/README.md

@@ -1,7 +1,6 @@
 # VST3 interfaces
 
-We currently support all VST 3.0.0 interfaces with the exception of `IUnitData`.
-See
+We currently support all VST 3.0.0 interfaces. See
 [docs/vst3.md](https://github.com/robbert-vdh/yabridge/blob/master/docs/vst3.md)
 for more information on how the serialization works.
 
@@ -21,6 +20,7 @@ VST3 plugin interfaces are implemented as follows:
 | `YaEditController2`        | `Vst3PluginProxy`   | `IEditController2`                                     |
 | `YaPluginBase`             | `Vst3PluginProxy`   | `IPluginBase`                                          |
 | `YaProgramListData`        | `Vst3PluginProxy`   | `IProgramListData`                                     |
+| `YaUnitData`               | `Vst3PluginProxy`   | `IUnitData`                                            |
 | `YaUnitInfo`               | `Vst3PluginProxy`   | `IUnitInfo`                                            |
 
 VST3 host interfaces are implemented as follows:

src/common/serialization/vst3/plugin/unit-data.cpp

@@ -0,0 +1,27 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "unit-data.h"
+
+YaUnitData::ConstructArgs::ConstructArgs() {}
+
+YaUnitData::ConstructArgs::ConstructArgs(
+    Steinberg::IPtr<Steinberg::FUnknown> object)
+    : supported(
+          Steinberg::FUnknownPtr<Steinberg::Vst::IUnitData>(object)) {}
+
+YaUnitData::YaUnitData(const ConstructArgs&& args)
+    : arguments(std::move(args)) {}

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

@@ -0,0 +1,77 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include <pluginterfaces/vst/ivstunits.h>
+
+#include "../../common.h"
+#include "../base.h"
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
+
+/**
+ * Wraps around `IUnitData` for serialization purposes. This is instantiated as
+ * part of `Vst3PluginProxy`.
+ */
+class YaUnitData : public Steinberg::Vst::IUnitData {
+   public:
+    /**
+     * These are the arguments for creating a `YaUnitData`.
+     */
+    struct ConstructArgs {
+        ConstructArgs();
+
+        /**
+         * Check whether an existing implementation implements `IUnitData` and
+         * read arguments from it.
+         */
+        ConstructArgs(Steinberg::IPtr<Steinberg::FUnknown> object);
+
+        /**
+         * Whether the object supported this interface.
+         */
+        bool supported;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value1b(supported);
+        }
+    };
+
+    /**
+     * Instantiate this instance with arguments read from another interface
+     * implementation.
+     */
+    YaUnitData(const ConstructArgs&& args);
+
+    inline bool supported() const { return arguments.supported; }
+
+    virtual tresult PLUGIN_API
+    unitDataSupported(Steinberg::Vst::UnitID unitId) override = 0;
+    virtual tresult PLUGIN_API
+    getUnitData(Steinberg::Vst::UnitID unitId,
+                Steinberg::IBStream* data) override = 0;
+    virtual tresult PLUGIN_API
+    setUnitData(Steinberg::Vst::UnitID unitId,
+                Steinberg::IBStream* data) override = 0;
+
+   protected:
+    ConstructArgs arguments;
+};
+
+#pragma GCC diagnostic pop