Vulkan is a new generation graphics and compute API that provides high-efficiency, cross-platform access to modern GPUs.
Check what Vulkan implementations are currently installed
https://github.com/SaschaWillems/Vulkan
NOTE: Radeon Vulkan “RADV” driver has enabled the Valve-backed ACO shader compiler by default rather than AMDs official AMDGPU LLVM shader compiler back-end.
It has feature parity with the AMDGPU LLVM back-end, RADV is now defaulting to using ACO in place of the AMDGPU LLVM shader compiler.