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Re:Rx v0.3 Released, a modern and minimalist pixel editor in... by wtetzner on Sunday December 29, 2019 @02:40PM (#21907955)
I doubt it’s about Vulkan features and probably has more to do with not wanting to waste time implementing multiple graphics backends. gfx-rs supports both Vulkan and Metal.

With Apple’s deprecation of OpenGL on macOS, the author may not have wanted to build on top of something that’s going away.

Re:Rx v0.3 Released, a modern and minimalist pixel editor in... by cloudhead on Sunday December 29, 2019 @02:46PM (#21908000)
Exactly - it’s not that any of Vulkan is needed, it’s that I don’t want to be building on OpenGL when superior graphic interfaces have been available for 5+ years now, and Vulkan+Metal is pretty widely supported on Desktop.