Add a proxy class for IPlugInterfaceSupport

meson.build

@@ -119,6 +119,7 @@ vst3_plugin_sources = [
   'src/common/serialization/vst3/component-handler/unit-handler-2.cpp',
   'src/common/serialization/vst3/context-menu/context-menu.cpp',
   'src/common/serialization/vst3/host-context/host-application.cpp',
+  'src/common/serialization/vst3/host-context/plug-interface-support.cpp',
   'src/common/serialization/vst3/plug-view/parameter-finder.cpp',
   'src/common/serialization/vst3/plug-view/plug-view.cpp',
   'src/common/serialization/vst3/plug-view/plug-view-content-scale-support.cpp',
@@ -202,6 +203,7 @@ if with_vst3
     'src/common/serialization/vst3/component-handler/unit-handler-2.cpp',
     'src/common/serialization/vst3/context-menu/context-menu.cpp',
     'src/common/serialization/vst3/host-context/host-application.cpp',
+    'src/common/serialization/vst3/host-context/plug-interface-support.cpp',
     'src/common/serialization/vst3/plug-view/parameter-finder.cpp',
     'src/common/serialization/vst3/plug-view/plug-view.cpp',
     'src/common/serialization/vst3/plug-view/plug-view-content-scale-support.cpp',

src/common/serialization/vst3/README.md

@@ -6,7 +6,7 @@ for more information on how the serialization works.
 
 The following interfaces are not yet implemented:
 
-- Interfaces introduced after VST 3.6.11
+- Interfaces introduced after VST 3.6.12
 - The [Presonus extensions](https://presonussoftware.com/en_US/developer),
   although most of these things seem to overlap with newer VST3 interfaces
 
@@ -48,6 +48,7 @@ VST3 host interfaces are implemented as follows:
 | --------------------------------- | --------------------------- | -------------------------------- |
 | `Vst3HostContextProxy`            |                             | All of the below:                |
 | `YaHostApplication`               | `Vst3HostContextProxy`      | `IHostApplication`               |
+| `YaPlugInterfaceSupport`          | `Vst3HostContextProxy`      | `IPlugInterfaceSupport`          |
 | `Vst3ComponentHandlerProxy`       |                             | All of the below:                |
 | `YaComponentHandler`              | `Vst3ComponentHandlerProxy` | `IComponentHandler`              |
 | `YaComponentHandler2`             | `Vst3ComponentHandlerProxy` | `IComponentHandler2`             |

src/common/serialization/vst3/host-context/host-application.h

@@ -105,6 +105,10 @@ class YaHostApplication : public Steinberg::Vst::IHostApplication {
 
     virtual tresult PLUGIN_API
     getName(Steinberg::Vst::String128 name) override = 0;
+
+    // We don't have to (and can't) pass this through. This is only used to
+    // create `IMessage` and `IAttributeList` objects that the plugin can use to
+    // pass messages between the processor and the controller objects.
     virtual tresult PLUGIN_API createInstance(Steinberg::TUID cid,
                                               Steinberg::TUID _iid,
                                               void** obj) override = 0;

src/common/serialization/vst3/host-context/plug-interface-support.cpp

@@ -0,0 +1,27 @@
+// 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/>.
+
+#include "plug-interface-support.h"
+
+YaPlugInterfaceSupport::ConstructArgs::ConstructArgs() {}
+
+YaPlugInterfaceSupport::ConstructArgs::ConstructArgs(
+    Steinberg::IPtr<Steinberg::FUnknown> object)
+    : supported(Steinberg::FUnknownPtr<Steinberg::Vst::IPlugInterfaceSupport>(
+          object)) {}
+
+YaPlugInterfaceSupport::YaPlugInterfaceSupport(const ConstructArgs&& args)
+    : arguments(std::move(args)) {}

src/common/serialization/vst3/host-context/plug-interface-support.h

@@ -0,0 +1,71 @@
+// 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 <pluginterfaces/vst/ivstpluginterfacesupport.h>
+
+#include "../../common.h"
+#include "../base.h"
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
+
+/**
+ * Wraps around `IPlugInterfaceSupport` for serialization purposes. This is
+ * instantiated as part of `Vst3HostContextProxy`.
+ */
+class YaPlugInterfaceSupport : public Steinberg::Vst::IPlugInterfaceSupport {
+   public:
+    /**
+     * These are the arguments for creating a `YaPlugInterfaceSupport`.
+     */
+    struct ConstructArgs {
+        ConstructArgs();
+
+        /**
+         * Check whether an existing implementation implements
+         * `IPlugInterfaceSupport` 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.
+     */
+    YaPlugInterfaceSupport(const ConstructArgs&& args);
+
+    inline bool supported() const { return arguments.supported; }
+
+    virtual tresult PLUGIN_API
+    isPlugInterfaceSupported(const Steinberg::TUID _iid) override = 0;
+
+   protected:
+    ConstructArgs arguments;
+};
+
+#pragma GCC diagnostic pop