Registered Extension Number




Ratification Status

Not ratified

Extension and Version Dependencies

SPIR-V Dependencies


Other Extension Metadata

Last Modified Date


Interactions and External Dependencies
  • Daniel Koch, NVIDIA

  • Graeme Leese, Broadcom

  • Jan-Harald Fredriksen, Arm

  • Faith Ekstrand, Intel

  • Jeff Bolz, NVIDIA

  • Ruihao Zhang, Qualcomm

  • Slawomir Grajewski, Intel

  • Spencer Fricke, Samsung


This extension adds support for the FragmentShaderPixelInterlockEXT, FragmentShaderSampleInterlockEXT, and FragmentShaderShadingRateInterlockEXT capabilities from the SPV_EXT_fragment_shader_interlock extension to Vulkan.

Enabling these capabilities provides a critical section for fragment shaders to avoid overlapping pixels being processed at the same time, and certain guarantees about the ordering of fragment shader invocations of fragments of overlapping pixels.

This extension can be useful for algorithms that need to access per-pixel data structures via shader loads and stores. Algorithms using this extension can access per-pixel data structures in critical sections without other invocations accessing the same per-pixel data. Additionally, the ordering guarantees are useful for cases where the API ordering of fragments is meaningful. For example, applications may be able to execute programmable blending operations in the fragment shader, where the destination buffer is read via image loads and the final value is written via image stores.

New Structures

New Enum Constants



  • Extending VkStructureType:


New SPIR-V Capabilities

Version History

  • Revision 1, 2019-05-24 (Piers Daniell)

    • Internal revisions

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.

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SPDX-License-Identifier: CC-BY-4.0