VkPhysicalDeviceSubgroupSizeControlProperties

The VkPhysicalDeviceSubgroupSizeControlProperties structure is defined as:

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

pub struct PhysicalDeviceSubgroupSizeControlProperties {
    s_type: vk::StructureType,
    p_next: *mut c_void,
    min_subgroup_size: u32, // The minimum subgroup size supported by this device
    max_subgroup_size: u32, // The maximum subgroup size supported by this device
    max_compute_workgroup_subgroups: u32, // The maximum number of subgroups supported in a workgroup
    required_subgroup_size_stages: vk::ShaderStageFlags, // The shader stages that support specifying a subgroup size
}

typedef VkPhysicalDeviceSubgroupSizeControlProperties VkPhysicalDeviceSubgroupSizeControlPropertiesEXT;

type PhysicalDeviceSubgroupSizeControlPropertiesEXT = vk::PhysicalDeviceSubgroupSizeControlProperties;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• EXTENSION LIMITS MINSUBGROUPSIZE
  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.
• EXTENSION LIMITS MAXSUBGROUPSIZE
  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.
• EXTENSION LIMITS MAXCOMPUTEWORKGROUPSUBGROUPS
  maxComputeWorkgroupSubgroups is the maximum number of subgroups supported by the implementation within a workgroup.
• EXTENSION LIMITS REQUIREDSUBGROUPSIZESTAGES
  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.