How would Dynamic Foveated Rendering with Eye Tracking in games actually work?

[peteo]

So vulkan has this but its targeting Nivida cards

https://www.khronos.org/registry/vulkan/specs/1.1-extensions/html/vkspec.html#VK_NV_shading_rate_image

AMD needs to jump on the variable rate shading band wagon!

Or games need to use direct X 12
https://techreport.com/news/34521/microsoft-standardizes-variable-rate-shading-as-a-part-of-directx-12/