# VK_EXT_attachment_feedback_loop_layout(3) Manual Page

## Name

VK_EXT_attachment_feedback_loop_layout - device extension

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## Registered Extension Number

340

## Revision

2

## Ratification Status

Ratified

## Extension and Version Dependencies

VK_KHR_get_physical_device_properties2
or
Vulkan Version 1.1

## Special Uses

- OpenGL / ES support

- D3D support

## Contact

- Joshua Ashton [GitHub]Joshua-Ashton

## Extension Proposal

VK_EXT_attachment_feedback_loop_layout

## Other Extension Metadata

Last Modified Date

  2022-04-04

IP Status

  No known IP claims.

Contributors

  - Joshua Ashton, Valve

  - Faith Ekstrand, Collabora

  - Bas Nieuwenhuizen, Google

  - Samuel Iglesias Gonsálvez, Igalia

  - Ralph Potter, Samsung

  - Jan-Harald Fredriksen, Arm

  - Ricardo Garcia, Igalia

## Description

This extension adds a new image layout, `VK_IMAGE_LAYOUT_ATTACHMENT_FEEDBACK_LOOP_OPTIMAL_EXT`, which allows applications to have an image layout in which they are able to both render to and sample/fetch from the same subresource of an image in a given render pass.

## New Structures

- Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:

  - VkPhysicalDeviceAttachmentFeedbackLoopLayoutFeaturesEXT

## New Enum Constants

- `VK_EXT_ATTACHMENT_FEEDBACK_LOOP_LAYOUT_EXTENSION_NAME`

- `VK_EXT_ATTACHMENT_FEEDBACK_LOOP_LAYOUT_SPEC_VERSION`

- Extending VkDependencyFlagBits:

  - `VK_DEPENDENCY_FEEDBACK_LOOP_BIT_EXT`

- Extending VkImageLayout:

  - `VK_IMAGE_LAYOUT_ATTACHMENT_FEEDBACK_LOOP_OPTIMAL_EXT`

- Extending VkImageUsageFlagBits:

  - `VK_IMAGE_USAGE_ATTACHMENT_FEEDBACK_LOOP_BIT_EXT`

- Extending VkPipelineCreateFlagBits:

  - `VK_PIPELINE_CREATE_COLOR_ATTACHMENT_FEEDBACK_LOOP_BIT_EXT`

  - `VK_PIPELINE_CREATE_DEPTH_STENCIL_ATTACHMENT_FEEDBACK_LOOP_BIT_EXT`

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_ATTACHMENT_FEEDBACK_LOOP_LAYOUT_FEATURES_EXT`

## Version History

- Revision 2, 2022-04-04 (Joshua Ashton)

  - Renamed from VALVE to EXT.

- Revision 1, 2021-03-09 (Joshua Ashton)

  - Initial draft.

## See Also

No cross-references are available

## 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0