Remote visionOS CompositorLayer with required ARKit session enabled for RemoteImmersiveSpace

RemoteVisionOSARKitLayer.swift

// copied from Apple Sample Codes: CS_HoverEffect  https://developer.apple.com/documentation/compositorservices/rendering_hover_effects_in_metal_immersive_apps
// and modified by banjun

#if os(macOS)
import CompositorServices
import SwiftUI

/// Usage:
/// ```swift
/// RemoteVisionOSARKitLayer { renderer, worldTracker in
///    while renderer.state != .invalidated {
///         guard let frame = renderer.queryNextFrame() else { continue }
///         // draw here
///     }
/// }
/// ```
///  NOTE: RemoteImmersiveSpace requires drawables to be attached a DeviceAnchor, that can be get from WorldTrackingProvider, that can be run in ARKitSession, that can be initialized with \.remoteDeviceIdentifier, that can be obtained after Pairing UI, presented by RemoteImmersiveSpace.
///  NOTE: the `Debug Executable` setting can affect to whether content is head-anchored (debug) or not (not in debug)
struct RemoteVisionOSARKitLayer: CompositorContent {
    @Environment(\.remoteDeviceIdentifier) private var remoteDeviceIdentifier: RemoteDeviceIdentifier?

    var configuration: any CompositorLayerConfiguration = .default
    var renderLoop: (LayerRenderer, WorldTrackingProvider?) async -> Void

    var body: some CompositorContent {
        CompositorLayer(configuration: configuration) { renderer in
            Task(priority: .high) {
                if let remoteDeviceIdentifier {
                    // NSLog("%@", "remoteDeviceIdentifier = \(remoteDeviceIdentifier)")
                    let arkitSession = ARKitSession(device: remoteDeviceIdentifier)
                    let worldTracker = WorldTrackingProvider()
                    // NSLog("%@", "starting arkitSession.run")
                    try await arkitSession.run([worldTracker])
                    NSLog("%@", "starting render loop")
                    await renderLoop(renderer, worldTracker)
                    NSLog("%@", "reached to end of render loop")
                } else {
                    NSLog("%@", "remoteDeviceIdentifier = \(String(describing: remoteDeviceIdentifier))")
                }
            }
        }
    }
}
#endif