DirectX emulation is the way in which Linux avid gamers are working Windows-only video games on Linux OSes, because of instruments corresponding to DXVK. But up till now, DXVK has solely supported DirectX 8 and newer. That is now altering; an impartial developer has taken up the work of making their very own DirectX 7-to-Vulkan emulation device, dubbed D7VK (through Phoronix).
D7VK is a spin-off of DXVK, which makes use of DXVK’s DirectX 9 emulation backend and Wine’s DDRAW implementation (for Linux, particularly) to create a “minimal d3d7-on-d3d9” implementation. This makes D7VK a two-stage translation layer that interprets DX7 calls to DX9 calls, then interprets these DX9 calls to Vulkan.
There’s a chance the developer could have created a straight DX7-to-Vulkan translation tool, but that likely would have taken significantly more work and time to develop. Instead, the developer is taking advantage of as much of DXVK’s existing codebase to add DX7 compatibility.
However, due to DirectX 7’s age (it launched in 1999), the developer warned of limited game support. Not all DX7 games will work with D7VK due to the way DX7 games were developed back then. According to the developer, DX7 titles that mix and match DirectX 7 with older DDraw versions (besides version 7), and/or with GDI are not expected to work ever.
Furthermore, the developer also answered the question of whether or not they would support DirectX 6 or older versions, to which they emphatically answered no.
DirectX 7 is ancient by gaming API standards, originally launching in 1999. The API was responsible for powering many of the early 2000s titles, including the original Counter-Strike, FIFA 2001, Deus Ex, and Unreal Tournament. Version 7 was responsible for introducing hardware-accelerated transformation and lighting, and diverting those tasks to the GPU rather than the CPU.