# VkPhysicalDeviceShaderClockFeaturesKHR(3) Manual Page

## Name

VkPhysicalDeviceShaderClockFeaturesKHR - Structure describing features supported by VK_KHR_shader_clock

## C Specification

To query shader clock support, call vkGetPhysicalDeviceFeatures2 with a `VkPhysicalDeviceShaderClockFeaturesKHR` structure included in the `pNext` chain of its `pFeatures` parameter.

The VkPhysicalDeviceShaderClockFeaturesKHR structure is defined as:

    typedef struct VkPhysicalDeviceShaderClockFeaturesKHR {
        VkStructureType    sType;
        void*              pNext;
        VkBool32           shaderSubgroupClock;
        VkBool32           shaderDeviceClock;
    } VkPhysicalDeviceShaderClockFeaturesKHR;

## Members

- `sType` is the type of this structure.

- `pNext` is `NULL` or a pointer to an extension-specific structure.

- `shaderSubgroupClock` indicates whether shaders can support `Subgroup` scoped clock reads.

- `shaderDeviceClock` indicates whether shaders can support `Device` scoped clock reads.

## Description

If the VkPhysicalDeviceShaderClockFeaturesKHR structure is included in the `pNext` chain of VkPhysicalDeviceFeatures2, it is filled with values indicating whether each feature is supported. VkPhysicalDeviceShaderClockFeaturesKHR can also be included in the `pNext` chain of VkDeviceCreateInfo to enable the features.

Valid Usage (Implicit)

- `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_CLOCK_FEATURES_KHR`

## See Also

`VkBool32`, VkStructureType

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.