Of course, I've neglected to mention Apple's Metal API, which is specific to iOS/Mac OS X. It also was made to reduce CPU overhead/increase performance over OpenGL. That said, work has already begun on getting Vulkan to work on Mac OS X and iOS by translating Vulkan API commands to Metal API. Not as efficient as direct support, but it means that you need to support one less graphics API, reducing development time/costs.

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