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C Specification

The VkPhysicalDeviceSubgroupSizeControlFeaturesEXT structure is defined as:

typedef struct VkPhysicalDeviceSubgroupSizeControlFeaturesEXT {
    VkStructureType    sType;
    void*              pNext;
    VkBool32           subgroupSizeControl;
    VkBool32           computeFullSubgroups;
} VkPhysicalDeviceSubgroupSizeControlFeaturesEXT;


The members of the VkPhysicalDeviceSubgroupSizeControlFeaturesEXT structure describe the following features:


  • subgroupSizeControl indicates whether the implementation supports controlling shader subgroup sizes via the VK_PIPELINE_SHADER_STAGE_CREATE_ALLOW_VARYING_SUBGROUP_SIZE_BIT_EXT flag and the VkPipelineShaderStageRequiredSubgroupSizeCreateInfoEXT structure.

  • computeFullSubgroups indicates whether the implementation supports requiring full subgroups in compute shaders via the VK_PIPELINE_SHADER_STAGE_CREATE_REQUIRE_FULL_SUBGROUPS_BIT_EXT flag.

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


The VkPhysicalDeviceSubgroupSizeControlFeaturesEXT structure was added in version 2 of the VK_EXT_subgroup_size_control extension. Version 1 implementations of this extension will not fill out the features structure but applications may assume that both subgroupSizeControl and computeFullSubgroups are supported if the extension is supported. (See also the Feature Requirements section.) Applications are advised to add a VkPhysicalDeviceSubgroupSizeControlFeaturesEXT structure to the pNext chain of VkDeviceCreateInfo to enable the features regardless of the version of the extension supported by the implementation. If the implementation only supports version 1, it will safely ignore the VkPhysicalDeviceSubgroupSizeControlFeaturesEXT structure.

Valid Usage (Implicit)

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