Registered Extension Number




Ratification Status


Extension and Version Dependencies

Deprecation State


Other Extension Metadata

Last Modified Date


Interactions and External Dependencies
  • Requires SPIR-V 1.2 for LocalSizeId

  • Lionel Duc, NVIDIA

  • Faith Ekstrand, Intel

  • Spencer Fricke, Samsung

  • Tobias Hector, AMD

  • Lionel Landwerlin, Intel

  • Graeme Leese, Broadcom

  • Tom Olson, Arm

  • Stu Smith, AMD

  • Yiwei Zhang, Google


VK_KHR_maintenance4 adds a collection of minor features, none of which would warrant an entire extension of their own.

The new features are as follows:

  • Allow the application to destroy their VkPipelineLayout object immediately after it was used to create another object. It is no longer necessary to keep its handle valid while the created object is in use.

  • Add a new maxBufferSize implementation-defined limit for the maximum size VkBuffer that can be created.

  • Add support for the SPIR-V 1.2 LocalSizeId execution mode, which can be used as an alternative to LocalSize to specify the local workgroup size with specialization constants.

  • Add a guarantee that images created with identical creation parameters will always have the same alignment requirements.

  • Add new vkGetDeviceBufferMemoryRequirementsKHR, vkGetDeviceImageMemoryRequirementsKHR, and vkGetDeviceImageSparseMemoryRequirementsKHR to allow the application to query the image memory requirements without having to create an image object and query it.

  • Relax the requirement that push constants must be initialized before they are dynamically accessed.

  • Relax the interface matching rules to allow a larger output vector to match with a smaller input vector, with additional values being discarded.

  • Add a guarantee for buffer memory requirement that the size memory requirement is never greater than the result of aligning create size with the alignment memory requirement.

New Commands

New Structures

New Enum Constants



  • Extending VkImageAspectFlagBits:


  • Extending VkStructureType:





Promotion to Vulkan 1.3

Functionality in this extension is included in core Vulkan 1.3, with the KHR suffix omitted. The original type, enum and command names are still available as aliases of the core functionality.



Version History

  • Revision 1, 2021-08-18 (Piers Daniell)

    • Internal revisions

  • Revision 2, 2021-10-25 (Yiwei Zhang)

    • More guarantees on buffer memory requirements

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.

Copyright 2014-2023 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0