Vulkan adds new features by first adding an extension for the feature. Then a later version of "mainline Vulkan" will upgrade those optional extensions to incl

Vulkan adds new features by first adding an extension for the feature. Then a later version of "mainline Vulkan" will upgrade those optional extensions to include them in the non-optional API. Even then, the feature underneath it is often optional, but the API to support it is built in, leaving it up to the app to check some feature bits before using it. Specifically the vulkan extensions that Dave Airlie has implemented for AMD GPUs from TONGA to NAVI2x are: VK_KHR_video_queue VK_KHR_video_decode_queue VK_EXT_video_decode_h264 VK_EXT_video_decode_h265 But he notes that the implementation work isn't done. It's just getting started.