We currently support all official VST 3.7.5 interfaces minus IPluginCompatibility, as that functionality is currently not used on Linux and implementing it would require parsing JSON within yabridge.

VST3 plugin interfaces are implemented as follows:

yabridge class	Included in	Interfaces
`Vst3PluginFactoryProxy`		All of the below:
`YaPluginFactory3`		`IPluginFactory`, `IPluginFactory2`, `IPluginFactory3`
`Vst3ConnectionPointProxy`		`IConnectionPoint` through `YaConnectionPoint`
`Vst3PlugViewProxy`		All of the below:
`YaParameterFinder`	`Vst3PlugViewProxy`	`IParameterFinder`
`YaPlugView`	`Vst3PlugViewProxy`	`IPlugView`
`YaPlugViewContentScaleSupport`	`Vst3PlugViewProxy`	`IPlugViewContentScaleSupport`
`Vst3PluginProxy`		All of the below:
`YaAudioPresentationLatency`	`Vst3PluginProxy`	`IAudioPresentationLatency`
`YaAudioProcessor`	`Vst3PluginProxy`	`IAudioProcessor`
`YaAutomationState`	`Vst3PluginProxy`	`IAutomationState`
`YaComponent`	`Vst3PluginProxy`	`IComponent`
`YaConnectionPoint`	`Vst3PluginProxy`	`IConnectionPoint`
`YaEditController`	`Vst3PluginProxy`	`IEditController`
`YaEditController2`	`Vst3PluginProxy`	`IEditController2`
`YaEditControllerHostEditing`	`Vst3PluginProxy`	`IEditControllerHostEditing`
`YaInfoListener`	`Vst3PluginProxy`	`IInfoListener`
`YaKeyswitchController`	`Vst3PluginProxy`	`IKeyswitchController`
`YaMidiLearn`	`Vst3PluginProxy`	`IMidiLearn`
`YaMidiMapping`	`Vst3PluginProxy`	`IMidiMapping`
`YaNoteExpressionController`	`Vst3PluginProxy`	`INoteExpressionController`
`YaNoteExpressionPhysicalUIMapping`	`Vst3PluginProxy`	`INoteExpressionPhysicalUIMapping`
`YaParameterFunctionName`	`Vst3PluginProxy`	`IParameterFunctionName`
`YaPluginBase`	`Vst3PluginProxy`	`IPluginBase`
`YaProcessContextRequirements`	`Vst3PluginProxy`	`IProcessContextRequirements`
`YaPrefetchableSupport`	`Vst3PluginProxy`	`IPrefetchableSupport`
`YaProgramListData`	`Vst3PluginProxy`	`IProgramListData`
`YaUnitData`	`Vst3PluginProxy`	`IUnitData`
`YaUnitInfo`	`Vst3PluginProxy`	`IUnitInfo`
`YaXmlRepresentationController`	`Vst3PluginProxy`	`IXmlRepresentationController`

VST3 host interfaces are implemented as follows:

yabridge class	Included in	Interfaces
`Vst3HostContextProxy`		All of the below:
`YaHostApplication`	`Vst3HostContextProxy`	`IHostApplication`
`YaPlugInterfaceSupport`	`Vst3HostContextProxy`	`IPlugInterfaceSupport`
`Vst3ComponentHandlerProxy`		All of the below:
`YaComponentHandler`	`Vst3ComponentHandlerProxy`	`IComponentHandler`
`YaComponentHandler2`	`Vst3ComponentHandlerProxy`	`IComponentHandler2`
`YaComponentHandler3`	`Vst3ComponentHandlerProxy`	`IComponentHandler3`
`YaComponentHandlerBusActivation`	`Vst3ComponentHandlerProxy`	`IComponentHandlerBusActivation`
`YaProgress`	`Vst3ComponentHandlerProxy`	`IProgress`
`YaUnitHandler`	`Vst3ComponentHandlerProxy`	`IUnitHandler`
`YaUnitHandler2`	`Vst3ComponentHandlerProxy`	`IUnitHandler2`
`Vst3ContextMenuProxy`		All of the below:
`YaContextMenu`	`Vst3ContextMenuProxy`	`IContextMenu`
`Vst3PlugFrameProxy`		All of the below:
`YaPlugFrame`	`Vst3PlugFrameProxy`	`IPlugFrame`

The following host interfaces are passed as function arguments and are thus also implemented for serialization purposes:

yabridge class	Interfaces	Notes
`YaAttributeList`	`IAttributeList`
`YaBStream`	`IBStream`, `ISizeableStream`, `IStreamAttributes`	Used for serializing data streams
`YaContextMenuTarget`	`IContextMenuTarget`	Used in `YaContextMenu` to proxy specific menu items
`YaEventList`	`IEventList`	Comes with a lot of serialization wrappers around the related structs
`YaMessage`	`IMessage`
`YaMessagePtr`	`IMessage`	Should be used in inter process communication to exchange messages
`YaParameterChanges`	`IParameterChanges`
`YaParamValueQueue`	`IParamValueQueue`

And finally YaProcessData uses the above along with YaAudioBusBuffers to wrap around ProcessData.