The reason you use DX12 in a new project is so that you can get good linux support.

I'm making a joke, but it's also true.

How good does Wine support DX12?

Support for DX12 under Proton in linux is incredibly good. Some games actually run faster under DX12 in Proton than the native versions do.

I don't think it's faster than a windows game running Vulkan, though, is it? Like, if you benchmarked a game that has native DX12 and Vulkan modes (such as Wolfenstein: The New Colossus, I believe), it will probably have higher FPS in Vulkan mode, right?

Well our game runs faster in DX12 under Proton than Vulkan under Proton.

Of course since Proton uses Vulkan to implement DX12, it means that our Vulkan implementation is simply worse than the one that Valve created to emulate DX12.

I'm sure it's possible to improve that, but it implies that there way to get the best performance out of Vulkan is less obvious than the way to get it out of DX12.

DXVK does not need wine.

Never mind, DXVK isn't for DX12.

it translates the calls to vulkan.

but why would you pick the worst API?