Vulkan's Portability Extension Coming Along, MoltenVK Now Boasts EXTX_portability_subset
Written by Michael Larabel in Vulkan on 28 January 2019 at 05:07 AM EST. Add A Comment
VULKAN --
It has yet to appear in a Vulkan specification update, but the MoltenVK implementation that supports the Vulkan API on iOS/macOS by mapping it to Apple's Metal drivers now supports the VK_EXTX_portability_subset functionality.

VK_EXTX_portability_subset is the experimental feature designed as part of the Vulkan Portability initiative. This allows for Vulkan implementations like MoltenVK to mark features as unsupported that otherwise are required by the Vulkan specification. The VK_EXTX_portability_subset extension can also be used to define properties/limits on what it can allow.

Basically it allows for a slightly slimmer Vulkan implementation than what would be allowed in a strict sense but is good enough for most games/applications. The effort around Vulkan Portability has been happening via a separate Git repository.

With today's MoltenVK update there is support now for the portability subset extension as well as other iOS/macOS support improvements.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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