>>718953323
AMD exclusively maintains all the drivers
on linux the only thing they directly maintain is AMDKFD (used for their CUDA clone) and AMDGPU which are much smaller than their windows kernel drivers
mesa, which implements vulkan and opengl is maintained by independent contributors, other graphics companies, valve employees (valve wrote the current shader compiler for AMD gpus, previously it used llvm like the windows drivers), and some AMD staff
dxvk and vkd3d which implement directx on top of vulkan are maintained mostly by valve employees
their are actually efforts to get mesa working on windows through reverse engineering the low level windows kernel driver interface however i don't know if it will actually result in performance increases