Add a serialization wrapper for PhysicalUIMap

Which we'll need for INoteExpressionPhysicalUIMapping.

src/common/serialization/vst3/physical-ui-map-list.h

@@ -0,0 +1,61 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020-2021 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 <vector>
+
+#include <pluginterfaces/vst/ivstphysicalui.h>
+
+/**
+ * Serialization wrapper around `PhysicalUIMapList` that allows loading such a
+ * list and recreating one from a `YaPhysicalUIMapList` object.
+ */
+class YaPhysicalUIMapList {
+   public:
+    YaPhysicalUIMapList();
+
+    /**
+     * Copy the data from a `PhysicalUIMapList` so it can be serialized.
+     */
+    YaPhysicalUIMapList(const Steinberg::Vst::PhysicalUIMapList& list);
+
+    /**
+     * Reconstruct the original `PhysicalUIMapList` object passed to the
+     * constructor and return it. This is used as part of
+     * `YaProcessData::get()`. The returned object is valid as long as this
+     * object is alive.
+     */
+    Steinberg::Vst::PhysicalUIMapList get();
+
+    template <typename S>
+    void serialize(S& s) {
+        s.container(maps, 1 << 31);
+    }
+
+   private:
+    std::vector<Steinberg::Vst::PhysicalUIMap> maps;
+};
+
+namespace Steinberg {
+namespace Vst {
+template <typename S>
+void serialize(S& s, PhysicalUIMap map) {
+    s.value4b(map.physicalUITypeID);
+    s.value4b(map.noteExpressionTypeID);
+}
+}  // namespace Vst
+}  // namespace Steinberg