[floatboth]

"hacked" driver, yeah, no.

There is nothing wrong with porting from Linux.

We have a compatibility layer for Linux drivers in the kernel (LinuxKPI), so the GPU drivers are not modified that much. A lot of work on LinuxKPI has been sponsored by Mellanox, by the way :) since it's also used for their network drivers (mlx4/5).

And it works fine, I'm currently writing this from a PC with an RX 480 running FreeBSD 12-CURRENT. DRI3, Wayland, Vulkan — everything works.

Also, the Sony driver would've been completely irrelevant to desktop systems. It supports one specific GPU model, Sony proprietary APIs, probably nothing in terms of KMS/DRM/GBM/EGL!