# VK_EXT_subpass_merge_feedback(3) Manual Page

## Name

VK_EXT_subpass_merge_feedback - device extension

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## Registered Extension Number

459

## Revision

2

## Ratification Status

Not ratified

## Extension and Version Dependencies

VK_KHR_get_physical_device_properties2
or
Vulkan Version 1.1

## Contact

- Ting Wei [GitHub]catweiting

## Extension Proposal

VK_EXT_subpass_merge_feedback

## Other Extension Metadata

Last Modified Date

  2022-05-24

IP Status

  No known IP claims.

Contributors

  - Jan-Harald Fredriksen, Arm

  - Jorg Wagner, Arm

  - Ting Wei, Arm

## Description

This extension adds a mechanism to provide feedback to an application about whether the subpasses specified on render pass creation are merged by the implementation. Additionally, it provides a control to enable or disable subpass merging in the render pass.

## New Structures

- VkRenderPassCreationFeedbackInfoEXT

- VkRenderPassSubpassFeedbackInfoEXT

- Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:

  - VkPhysicalDeviceSubpassMergeFeedbackFeaturesEXT

- Extending VkRenderPassCreateInfo2:

  - VkRenderPassCreationFeedbackCreateInfoEXT

- Extending VkRenderPassCreateInfo2, VkSubpassDescription2:

  - VkRenderPassCreationControlEXT

- Extending VkSubpassDescription2:

  - VkRenderPassSubpassFeedbackCreateInfoEXT

## New Enums

- VkSubpassMergeStatusEXT

## New Enum Constants

- `VK_EXT_SUBPASS_MERGE_FEEDBACK_EXTENSION_NAME`

- `VK_EXT_SUBPASS_MERGE_FEEDBACK_SPEC_VERSION`

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBPASS_MERGE_FEEDBACK_FEATURES_EXT`

  - `VK_STRUCTURE_TYPE_RENDER_PASS_CREATION_CONTROL_EXT`

  - `VK_STRUCTURE_TYPE_RENDER_PASS_CREATION_FEEDBACK_CREATE_INFO_EXT`

  - `VK_STRUCTURE_TYPE_RENDER_PASS_SUBPASS_FEEDBACK_CREATE_INFO_EXT`

## Version History

- Revision 1, 2022-03-10

  - Initial draft.

- Revision 2, 2022-05-24

  - Fix structextends and constness issues.

## 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