# VK_KHR_8bit_storage(3) Manual Page

## Name

VK_KHR_8bit_storage - device extension

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## Registered Extension Number

178

## Revision

1

## Ratification Status

Ratified

## Extension and Version Dependencies

VK_KHR_get_physical_device_properties2
and
VK_KHR_storage_buffer_storage_class
or
Vulkan Version 1.1

## SPIR-V Dependencies

- SPV_KHR_8bit_storage

## Deprecation State

- Promoted to Vulkan 1.2

## Contact

- Alexander Galazin [GitHub]alegal-arm

## Other Extension Metadata

Last Modified Date

  2018-02-05

Interactions and External Dependencies

  - This extension provides API support for `GL_EXT_shader_16bit_storage`

IP Status

  No known IP claims.

Contributors

  - Alexander Galazin, Arm

## Description

The `VK_KHR_8bit_storage` extension allows use of 8-bit types in uniform and storage buffers, and push constant blocks. This extension introduces several new optional features which map to SPIR-V capabilities and allow access to 8-bit data in `Block`-decorated objects in the `Uniform` and the `StorageBuffer` storage classes, and objects in the `PushConstant` storage class.

The `StorageBuffer8BitAccess` capability must be supported by all implementations of this extension. The other capabilities are optional.

## Promotion to Vulkan 1.2

Vulkan APIs in this extension are included in core Vulkan 1.2, with the KHR suffix omitted. However, if Vulkan 1.2 is supported and this extension is not, the `StorageBuffer8BitAccess` capability is optional. External interactions defined by this extension, such as SPIR-V token names, retain their original names. The original Vulkan API names are still available as aliases of the core functionality.

## Promotion to Vulkan 1.4

If Vulkan 1.4 is supported, support for the `storageBuffer8BitAccess` capability is required.

## New Structures

- Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:

  - VkPhysicalDevice8BitStorageFeaturesKHR

## New Enum Constants

- `VK_KHR_8BIT_STORAGE_EXTENSION_NAME`

- `VK_KHR_8BIT_STORAGE_SPEC_VERSION`

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_8BIT_STORAGE_FEATURES_KHR`

## New SPIR-V Capabilities

- `StorageBuffer8BitAccess`

- `UniformAndStorageBuffer8BitAccess`

- `StoragePushConstant8`

## Version History

- Revision 1, 2018-02-05 (Alexander Galazin)

  - 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0