A Boolean value that determines whether the layer’s textures are restricted for use as framebuffer attachments.
Mac Catalyst 13.0+
If the value is YES (the default), the CAMetalLayer class allocates its MTLTexture objects in ways that are optimized for display purposes. However, you may not sample, read from, or write to those textures. To support sampling and pixel read/write operations on the layer’s textures (at a cost to performance), set this value to NO.