VK_EXT_queue_family_foreign(3)

# VK_EXT_queue_family_foreign(3) Manual Page

## Name

VK_EXT_queue_family_foreign - device extension

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## Registered Extension Number

127

## Revision

1

## Extension and Version Dependencies

- Requires Vulkan 1.0

- Requires `VK_KHR_external_memory`

## Contact

- Chad Versace chadversary

## Other Extension Metadata

Last Modified Date

  2017-11-01

IP Status

  No known IP claims.

Contributors

  - Chad Versace, Google

  - James Jones, NVIDIA

  - Jason Ekstrand, Intel

  - Jesse Hall, Google

  - Daniel Rakos, AMD

  - Ray Smith, ARM

## Description

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

- `VK_EXT_QUEUE_FAMILY_FOREIGN_EXTENSION_NAME`

- `VK_EXT_QUEUE_FAMILY_FOREIGN_SPEC_VERSION`

- `VK_QUEUE_FAMILY_FOREIGN_EXT`

## Version History

- Revision 1, 2017-11-01 (Chad Versace)

  - Squashed internal revisions

## See Also

VK_QUEUE_FAMILY_FOREIGN_EXT

## 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.

## Copyright

Copyright 2014-2022 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0