Vulkan

Currently, the Gentoo tree has a basic package which provides :

If you want the open source Vulkan drivers, you need to enable the vulkan USE flag in. The following list shows the vulkan supported in Mesa:

The following alternative driver exist:
 * AMDGPU-PRO, official closed-source driver for AMD hardware
 * NVidia/nvidia-drivers, official closed-source driver for Nvidia hardware

You can check the (inofficial) Vulkan hardware database for a list of detailed GPU hardware capabilites for Vulkan.