include::{generated}/meta/VK_KHR_shader_clock.txt[]

*Last Modified Date*::
    2019-4-25
*IP Status*::
    No known IP claims.
*Interactions and External Dependencies*::
  - This extension requires
    https://www.khronos.org/registry/spir-v/extensions/KHR/SPV_KHR_shader_clock.html[+SPV_KHR_shader_clock+]
*Contributors*::
  - Aaron Hagan, AMD
  - Daniel Koch, NVIDIA

This extension advertises the SPIR-V code:ShaderClockKHR capability for
Vulkan, which allows a shader to query a real-time or monotonically
incrementing counter at the subgroup level or across the device level.
The two valid SPIR-V scopes for code:OpReadClockKHR are code:Subgroup and
code:Device.

=== New Object Types

None.

=== New Enum Constants

  * Extending elink:VkStructureType:
  ** ename:VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_CLOCK_FEATURES_KHR

=== New SPIR-V Capabilities

  * <<spirvenv-capabilities-table-shaderclock, code:ShaderClockKHR>>

=== New Structures

  * slink:VkPhysicalDeviceShaderClockFeaturesKHR

=== Version History

  * Revision 1, 2019-4-25 (Aaron Hagan)
    - Initial revision