Specific to DirectX 12 and Metal, there is an issue with limits on resources. In general, Metal does tessellation differently, and is missing geometry shaders and transform feedback. Metal has an SRV ceiling of half that amount. They say DirectX 12 requires one million shader resource views (SRVs), which is a lot when compared to cross-platform technologies like Vulkan. According to CodeWeavers, the barrier to entry is Apple’s Metal. While experimental code is already being merged into Valve's Proton for Linux users to enjoy, VKD3D on Mac is wrought with numerous technical challenges and limitations that must be surmounted. In 2006, their consumer product Crossover Office was given a new lease on life when Apple switched to Intel, prompting them to port the Linux/Xorg native application to a BSD/Aqua environment. They’ve been building solutions on Wine (Wine-Is-Not-An-Emulator) for over 20 years, providing commercial solutions to the public and private sectors all the while. Of course, CodeWeavers is no stranger to the technology that Proton was forked from.
DXVK is the software responsible for translating DirectX to Vulcan on the fly, while VKD3D does the same thing for DirectX 12 At least the titles that don’t either make use of a Windows anti-cheat client designed to detect the environment it’s running on, or are not victim to a DirectX call that isn’t completely compatible with DXVK or VKD3D. Since that contract began secretly in 2016, a large portion of the Steam catalog now runs on Linux. When Valve contracted parts of the CodeWeavers team to help build Proton, they probably didn’t expect the level of success they’re seeing today.
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