Version: 2021.2
Creating an XR provider
Runtime discovery and activation of subsystems

UnitySubsystemsManifest.json

UnitySubsystemsManifest.json contains metadata about your provider that can be queried before your plugin is loaded. The values in this dictionary are used to populate specific instances of SubsystemDescriptors in C#. For example, information within the displays list is used to populate XRDisplaySubsystemDescriptors.

Example .json file:

{
    "name": "PluginName",
    "version": "1.0.0",
    "libraryName": "UnityXRDisplayExample",

    "displays": [
        {
            "id": "Display0",
            "supportedMirrorBlitReservedModes" : ["leftEye","rightEye", "sideBySide"]
        }
    ],
    "inputs:": [
        {
            "id": "MockHMD Head Tracking Stationary"
        },
        {
            "id": "MockHMD Head Tracking Simulated"
        }
    ]
}
Metadata Description
name The name of your provider. Must match the first parameter of your native plug-inA set of code created outside of Unity that creates functionality in Unity. There are two kinds of plug-ins you can use in Unity: Managed plug-ins (managed .NET assemblies created with tools like Visual Studio) and Native plug-ins (platform-specific native code libraries). More info
See in Glossary
’s RegisterLifecycleHandler call. Likely to show up in UI(User Interface) Allows a user to interact with your application. Unity currently supports three UI systems. More info
See in Glossary
in the future.
version Unused currently. Likely to show up in UI in the future.
libraryName Must match the name of your provider’s native plug-inA platform-specific native code library that is created outside of Unity for use in Unity. Allows you can access features like OS calls and third-party code libraries that would otherwise not be available to Unity. More info
See in Glossary
binary without the extension.
displays Collection of Display subsystem providers.
id Identifier for this display plug-in configuration. The id must match the string you pass into your native plug-in’s RegisterLifecycleHandler call for that subsystem. You can have more than one display, as long as your native plugin calls RegisterLifecycleHandler for each.
inputs Collection of Input subsystem providers.

Your manifest file can include other displays after id - subsystems specify which parameters are valid.

Creating an XR provider
Runtime discovery and activation of subsystems