The QNativeInterface::QVisionOSApplication interface allows opening
and dismissing an immersive space, as well as registering a compositor
layer implementation that can be used to configure the compositor
layer and render to it with Metal.
The compositor layer implementation is consulted both for immersive
spaces triggered explicitly, and when the default scene of the app
is set to CPSceneSessionRoleImmersiveSpaceApplication via the
UIApplicationPreferredDefaultSceneSessionRole in the Info.plist.
All of this requires that the application follows the SwiftUI app
lifecyle, so our application entrypoint is now a SwiftUI app. The
existing qt_main_wrapper used for the QIOSEventDispatcher handles
this transparently, so there is no change for the user, who will
still receive a callback to main() when the Swift app is ready
to build its UI hierarchy.
Change-Id: Ic295010d714e90cd4d3f66bd90f321438659f3a6
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
1f667ba70e