Foveated is available on native renderers/custom engines too: (source: "Discover Metal for immersive apps - WWDC23 - Videos - Apple Developer " https://develop

Foveated is available on native renderers/custom engines too: (source: "Discover Metal for immersive apps - WWDC23 - Videos - Apple Developer " https://developer.apple.com/videos/play/wwdc2023/10089/ https://developer.apple.com/videos/play/wwdc2023/10089/) If they try to hide it by restricting access to reading the foveation texture, you can be sure anti privacy apps like Immersive Facebook will try tricks like recovering it from GPU timestamp queries (render two transparent triangles covering the screen in separate draw calls, find which took the longest, subdivide and repeat).