In addition to cross-platform support and being open source, what else sets Vulkan apart from Microsoft DirectX 12?

From an external point of view, the biggest difference has to do with the platforms and the hardware that they support. DirectX 12 was designed for just a few target hardware devices. It runs on only one operating system, whereas Vulkan supports hardware from 10s of companies and supports a much broader range of platforms. There is a bit higher level of abstraction in Vulkan that accommodates that increased affordability. The abstraction is a good thing because it enables affordability, while providing the same performance and usability you get from DirectX 12.

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