C Specification

The VkPhysicalDeviceSubgroupSizeControlProperties structure is defined as:

// Provided by VK_VERSION_1_3
typedef struct VkPhysicalDeviceSubgroupSizeControlProperties {
    VkStructureType       sType;
    void*                 pNext;
    uint32_t              minSubgroupSize;
    uint32_t              maxSubgroupSize;
    uint32_t              maxComputeWorkgroupSubgroups;
    VkShaderStageFlags    requiredSubgroupSizeStages;
} VkPhysicalDeviceSubgroupSizeControlProperties;

or the equivalent

// Provided by VK_EXT_subgroup_size_control
typedef VkPhysicalDeviceSubgroupSizeControlProperties VkPhysicalDeviceSubgroupSizeControlPropertiesEXT;

Members

  • sType is a VkStructureType value identifying this structure.

  • pNext is NULL or a pointer to a structure extending this structure.

Description

  • minSubgroupSize is the minimum subgroup size supported by this device. minSubgroupSize is at least one if any of the physical device’s queues support VK_QUEUE_GRAPHICS_BIT or VK_QUEUE_COMPUTE_BIT. minSubgroupSize is a power-of-two. minSubgroupSize is less than or equal to maxSubgroupSize. minSubgroupSize is less than or equal to subgroupSize.

  • maxSubgroupSize is the maximum subgroup size supported by this device. maxSubgroupSize is at least one if any of the physical device’s queues support VK_QUEUE_GRAPHICS_BIT or VK_QUEUE_COMPUTE_BIT. maxSubgroupSize is a power-of-two. maxSubgroupSize is greater than or equal to minSubgroupSize. maxSubgroupSize is greater than or equal to subgroupSize.

  • maxComputeWorkgroupSubgroups is the maximum number of subgroups supported by the implementation within a workgroup.

  • requiredSubgroupSizeStages is a bitfield of what shader stages support having a required subgroup size specified.

If the VkPhysicalDeviceSubgroupSizeControlProperties structure is included in the pNext chain of the VkPhysicalDeviceProperties2 structure passed to vkGetPhysicalDeviceProperties2, it is filled in with each corresponding implementation-dependent property.

If VkPhysicalDeviceSubgroupProperties::supportedOperations includes VK_SUBGROUP_FEATURE_QUAD_BIT, minSubgroupSize must be greater than or equal to 4.

Valid Usage (Implicit)

  • VUID-VkPhysicalDeviceSubgroupSizeControlProperties-sType-sType
    sType must be VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SUBGROUP_SIZE_CONTROL_PROPERTIES

See Also

VK_EXT_subgroup_size_control, VK_VERSION_1_3, VkShaderStageFlags, 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0