Name

VK_KHR_maintenance1 - device extension

VK_KHR_maintenance1

Name String

VK_KHR_maintenance1

Extension Type

Device extension

Registered Extension Number

70

Revision

2

Ratification Status

Ratified

Extension and Version Dependencies; Deprecation State

• Promoted to Vulkan 1.1

Contact

• Piers Daniell @pdaniell-nv%0A*Here describe the issue or question you have about the VK_KHR_maintenance1 extension*

Other Extension Metadata

Last Modified Date

2018-03-13

Interactions and External Dependencies

• Promoted to Vulkan 1.1 Core

Contributors

• Dan Ginsburg, Valve
• Daniel Koch, NVIDIA
• Daniel Rakos, AMD
• Jan-Harald Fredriksen, ARM
• Faith Ekstrand, Intel
• Jeff Bolz, NVIDIA
• Jesse Hall, Google
• John Kessenich, Google
• Michael Worcester, Imagination Technologies
• Neil Henning, Codeplay Software Ltd.
• Piers Daniell, NVIDIA
• Slawomir Grajewski, Intel
• Tobias Hector, Imagination Technologies
• Tom Olson, ARM

Description

VK_KHR_maintenance1 adds a collection of minor features that were intentionally left out or overlooked from the original Vulkan 1.0 release.

The new features are as follows:

• Allow 2D and 2D array image views to be created from 3D images, which can then be used as color framebuffer attachments. This allows applications to render to slices of a 3D image.
• Support cmdCopyImage between 2D array layers and 3D slices. This extension allows copying from layers of a 2D array image to slices of a 3D image and vice versa.
• Allow negative height to be specified in the Viewport::height field to perform y-inversion of the clip-space to framebuffer-space transform. This allows apps to avoid having to use gl_Position.y = -gl_Position.y in shaders also targeting other APIs.
• Allow implementations to express support for doing just transfers and clears of image formats that they otherwise support no other format features for. This is done by adding new format feature flags FORMAT_FEATURE_TRANSFER_SRC_BIT_KHR and FORMAT_FEATURE_TRANSFER_DST_BIT_KHR.
• Support cmdFillBuffer on transfer-only queues. Previously cmdFillBuffer was defined to only work on command buffers allocated from command pools which support graphics or compute queues. It is now allowed on queues that just support transfer operations.
• Fix the inconsistency of how error conditions are returned between the createGraphicsPipelines and createComputePipelines functions and the allocateDescriptorSets and allocateCommandBuffers functions.
• Add new ERROR_OUT_OF_POOL_MEMORY_KHR error so implementations can give a more precise reason for allocateDescriptorSets failures.
• Add a new command trimCommandPoolKHR which gives the implementation an opportunity to release any unused command pool memory back to the system.

Promotion to Vulkan 1.1

All functionality in this extension is included in core Vulkan 1.1, with the KHR suffix omitted. The original type, enum and command names are still available as aliases of the core functionality.

New Commands

• trimCommandPoolKHR

New Bitmasks

• CommandPoolTrimFlagsKHR

New Enum Constants

• KHR_MAINTENANCE1_EXTENSION_NAME

• KHR_MAINTENANCE1_SPEC_VERSION
• KHR_MAINTENANCE_1_EXTENSION_NAME
• KHR_MAINTENANCE_1_SPEC_VERSION

• Extending FormatFeatureFlagBits:

  • FORMAT_FEATURE_TRANSFER_DST_BIT_KHR
  • FORMAT_FEATURE_TRANSFER_SRC_BIT_KHR

• Extending ImageCreateFlagBits:

  • IMAGE_CREATE_2D_ARRAY_COMPATIBLE_BIT_KHR

• Extending Result:

  • ERROR_OUT_OF_POOL_MEMORY_KHR

Issues

1. Are viewports with zero height allowed?

   RESOLVED: Yes, although they have low utility.

Version History

• Revision 1, 2016-10-26 (Piers Daniell)

  • Internal revisions

• Revision 2, 2018-03-13 (Jon Leech)

  • Add issue for zero-height viewports

See Also

CommandPoolTrimFlagsKHR, trimCommandPoolKHR

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.