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MoltenVK implements the Vulkan API on Metal: https://arstechnica.com/gadgets/2018/02/vulkan-is-coming-to-...

And as stated in that article, work is also being made to implement Vulkan on DirectX, allowing Vulkan apps to be distributed through the Windows Store (which requires DirectX).

Nintendo Switch supports Vulkan. I expect we'll see Vulkan support quite strongly in the next generation of consoles (besides maybe Microsoft's)

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Nintendo Switch supports Vulkan as much as the PS 3 supported OpenGL ES.

It is there, but it isn't the main 3D graphics API.

A cross-platform API will never be first-class on a console. The GPU in the Switch is a generic Tegra Maxwell with full OpenGL and DirectX (unusable, obviously) support, yet Nintendo still pushes NVN as the first class.

PS4 has GNX, etc. Only Xbox has that chance since it has DirectX, but fat chance seeing that on OS X or Linux/*BSD

If you want good performance on xbox you still have to use console specific APIs, in every engine I've worked with xbox is a special platform. I haven't done xbox development post dx12, but afaik xbox one still has console specific apis with dx12. Most PC games are not uwp (steam can't host uwp games), so extra work needs to be done to support both uwp and win32 as well as console specific direct3d.

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