Expected within the next few months, a similar translation layer is being developed that will enable Vulkan applications to use a DirectX 12 back-end. The portable subset will also soon be able to target another platform: DirectX 12. A handful of Vulkan features aren't available, but overall the portable subset is substantial. It has been deliberately designed to not perform any significant remapping or conversion of data and function calls, ensuring that its performance is predictable and consistent, and its overheads are low.

MoltenVK has been designed as a very thin layer. The identification of a universally portable subset of Vulkan, one that can be efficiently run on top of other GPU APIs, is the result. However, developers also told Khronos that they didn't want a fourth API to learn rather, they hoped the company could repurpose some existing API to give them this reach.

The release is in response to demands from developers they want a cross-platform API to maximize their reach but also need to be able to reach Apple's platforms.

Further Reading Khronos unveils Vulkan: OpenGL built for modern systems

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