As other mates have said here, comparing Metal and Vulkan is irellevant the moment you aren't doing it in the same platform/OS and same hardware executing the same software/game, as otherwise it would be comparing apples with oranges.
I honestly don't know why Apple wanted to put all that effort and time into Metal when they belong to Khronos group and Vulkan was already implemented. One thing is to have Swift which maybe has some features/a strong framework behind aimed at iOS/iPadOS and macOS that maybe other languages don't have, but the other thing is to have a "closed" graphic API when another exists with basically same or even more features, being cross-platform, and already well established.
Edit: On the "there's no way Apple can achieve that (RDNA 2.0, etc.) level", it seems like people ain't learning. People has been saying the same for ARM since rumours just started years ago, and in just a few months they'll just have to shut and accept they were wrong. If there's a business in this world that can do whatever they want for the good and for the bad, it's Apple as they basically have unlimited budget and leverage to hire top tier engineers to design what they feel like.
I honestly don't know why Apple wanted to put all that effort and time into Metal when they belong to Khronos group and Vulkan was already implemented. One thing is to have Swift which maybe has some features/a strong framework behind aimed at iOS/iPadOS and macOS that maybe other languages don't have, but the other thing is to have a "closed" graphic API when another exists with basically same or even more features, being cross-platform, and already well established.
Edit: On the "there's no way Apple can achieve that (RDNA 2.0, etc.) level", it seems like people ain't learning. People has been saying the same for ARM since rumours just started years ago, and in just a few months they'll just have to shut and accept they were wrong. If there's a business in this world that can do whatever they want for the good and for the bad, it's Apple as they basically have unlimited budget and leverage to hire top tier engineers to design what they feel like.
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