Will be Windows, Linux and FreeBSD Vulkan support on the same level? Or some of those drivers (Linux, FreeBSD) will have less features?
Same as with OpenGL. The driver is shared across all operating systems and abstracted by a shim. That’s why a new OpenGL driver always releases for all platforms and the performance is also the same independent of operating system. In fact the Vulkan driver is hosted by the OpenGL driver.
So about that FreeBSD Vulkan driver, is it coming any time soon?