> I thought mesa is linux only driver

You thought wrong. From [0]

> Mesa is primarily developed and used on Linux systems. But there’s also support for Windows, other flavors of Unix and other systems such as Haiku.

Also check out [1]

[0] <https://docs.mesa3d.org/systems.html>

[1] <https://docs.mesa3d.org/systems.html#deprecated-systems-and-...>