vk: Refactor physical device selection #1671
Merged
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Rather than electing the first physical device it finds, and falling back on the first-listed GPU: a series of stable-partitions are done so that the "least compromising" GPU is selected based on a series of criteria.
It will now maximally try to find a GPU that(in order of priority):
R5G5B5
/R5G6B5A1
/R4G4B4A4
fragmentStoresAndAtomics
In the case that a system has two dGPUs and one of them supports optimal-formats, the optimal-format one is selected
In the case that a system has an iGPU and the dGPU and they both support optimal formats, the dGPU is selected.
In the case that a system has an iGPU and the dGPU and the dGPU doesn't support optimal formats, the dGPU is still selected.