# VkPhysicalDeviceSubgroupSizeControlFeatures(3) Manual Page

## Name

VkPhysicalDeviceSubgroupSizeControlFeatures - Structure describing the subgroup size control features that can be supported by an implementation

Loading… please wait.

## C Specification

The `VkPhysicalDeviceSubgroupSizeControlFeatures` structure is defined as:

    // Provided by VK_VERSION_1_3
    typedef struct VkPhysicalDeviceSubgroupSizeControlFeatures {
        VkStructureType    sType;
        void*              pNext;
        VkBool32           subgroupSizeControl;
        VkBool32           computeFullSubgroups;
    } VkPhysicalDeviceSubgroupSizeControlFeatures;

or the equivalent

    // Provided by VK_EXT_subgroup_size_control
    typedef VkPhysicalDeviceSubgroupSizeControlFeatures VkPhysicalDeviceSubgroupSizeControlFeaturesEXT;

## Members

This structure describes the following features:

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

## Description

- `subgroupSizeControl` indicates whether the implementation supports controlling shader subgroup sizes via the `VK_PIPELINE_SHADER_STAGE_CREATE_ALLOW_VARYING_SUBGROUP_SIZE_BIT` flag and the VkPipelineShaderStageRequiredSubgroupSizeCreateInfo structure.

- `computeFullSubgroups` indicates whether the implementation supports requiring full subgroups in compute , mesh, or task shaders via the `VK_PIPELINE_SHADER_STAGE_CREATE_REQUIRE_FULL_SUBGROUPS_BIT` flag.

If the `VkPhysicalDeviceSubgroupSizeControlFeatures` structure is included in the `pNext` chain of the VkPhysicalDeviceFeatures2 structure passed to vkGetPhysicalDeviceFeatures2, it is filled in to indicate whether each corresponding feature is supported. If the application wishes to use a VkDevice with any features described by `VkPhysicalDeviceSubgroupSizeControlFeatures`, it must add an instance of the structure, with the desired feature members set to `VK_TRUE`, to the `pNext` chain of VkDeviceCreateInfo when creating the VkDevice.

Note | 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. Vulkan 1.3 implementations always support the features structure.

Valid Usage (Implicit)

- VUID-VkPhysicalDeviceSubgroupSizeControlFeatures-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBGROUP_SIZE_CONTROL_FEATURES`

## See Also

VK_EXT_subgroup_size_control, VK_VERSION_1_3, 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0