my guess would be total rewrite of the engine to use Vulkan. Where DX 12 can be plugged in for now.
Now when first true full dx 12 games start dropping; we then can go why not Vulkan as both aren't just plugged in but written from the ground up.
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AMD Announces DirectX 12 Game Engine Developer Partnerships
- Thread starter LoadsaMoney
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my guess would be total rewrite of the engine to use Vulkan. Where DX 12 can be plugged in for now.
Now when first true full dx 12 games start dropping; we then can go why not Vulkan as both aren't just plugged in but written from the ground up.
It would be a rewrite for either, However Croteam managed it with the talos principle all be it a wrapper of sorts.
Guess it depends on when they started it, going on what other devs/studios have said having done one it's next to nothing to implement the other.