I'm curious about the autoreleasepool. What's the reason to have it and how much of a difference does it make?

Looks great, thanks so much for writing this!

I've put everything I've learned while developing graphics for Apple Vision with the Metal API and Compositor Services in writing. It covers foveation, vertex amplification, stereoscopic rendering, and more techniques that extend beyond this particular device.

Thanks! Looks very interesting and usefull.