Registered Extension Number




Ratification Status

Not ratified

Extension and Version Dependencies


Other Extension Metadata

Last Modified Date


IP Status

No known IP claims.

  • Lina Versace, Google

  • James Jones, NVIDIA

  • Faith Ekstrand, Intel

  • Jesse Hall, Google

  • Daniel Rakos, AMD

  • Ray Smith, ARM


This extension defines a special queue family, VK_QUEUE_FAMILY_FOREIGN_EXT, which can be used to transfer ownership of resources backed by external memory to foreign, external queues. This is similar to VK_QUEUE_FAMILY_EXTERNAL_KHR, defined in VK_KHR_external_memory. The key differences between the two are:

  • The queues represented by VK_QUEUE_FAMILY_EXTERNAL_KHR must share the same physical device and the same driver version as the current VkInstance. VK_QUEUE_FAMILY_FOREIGN_EXT has no such restrictions. It can represent devices and drivers from other vendors, and can even represent non-Vulkan-capable devices.

  • All resources backed by external memory support VK_QUEUE_FAMILY_EXTERNAL_KHR. Support for VK_QUEUE_FAMILY_FOREIGN_EXT is more restrictive.

  • Applications should expect transitions to/from VK_QUEUE_FAMILY_FOREIGN_EXT to be more expensive than transitions to/from VK_QUEUE_FAMILY_EXTERNAL_KHR.

New Enum Constants




Version History

  • Revision 1, 2017-11-01 (Lina Versace)

    • Squashed internal revisions

See Also

Document Notes

For more information, see the Vulkan Specification

This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.

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