VkPhysicalDeviceAccelerationStructurePropertiesKHR(3)

Name

VkPhysicalDeviceAccelerationStructurePropertiesKHR - Properties of the physical device for acceleration structure

C Specification

The VkPhysicalDeviceAccelerationStructurePropertiesKHR structure is defined as:

// Provided by VK_KHR_acceleration_structure
typedef struct VkPhysicalDeviceAccelerationStructurePropertiesKHR {
    VkStructureType    sType;
    void*              pNext;
    uint64_t           maxGeometryCount;
    uint64_t           maxInstanceCount;
    uint64_t           maxPrimitiveCount;
    uint32_t           maxPerStageDescriptorAccelerationStructures;
    uint32_t           maxPerStageDescriptorUpdateAfterBindAccelerationStructures;
    uint32_t           maxDescriptorSetAccelerationStructures;
    uint32_t           maxDescriptorSetUpdateAfterBindAccelerationStructures;
    uint32_t           minAccelerationStructureScratchOffsetAlignment;
} VkPhysicalDeviceAccelerationStructurePropertiesKHR;

Members

sType is a VkStructureType value identifying this structure.
pNext is NULL or a pointer to a structure extending this structure.
maxGeometryCount is the maximum number of geometries in the bottom level acceleration structure.
maxInstanceCount is the maximum number of instances in the top level acceleration structure.
maxPrimitiveCount is the maximum number of triangles or AABBs in all geometries in the bottom level acceleration structure.
maxPerStageDescriptorAccelerationStructures is the maximum number of acceleration structure bindings that can be accessible to a single shader stage in a pipeline layout. Descriptor bindings with a descriptor type of VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR count against this limit. Only descriptor bindings in descriptor set layouts created without the VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT bit set count against this limit.
maxPerStageDescriptorUpdateAfterBindAccelerationStructures is similar to maxPerStageDescriptorAccelerationStructures but counts descriptor bindings from descriptor sets created with or without the VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT bit set.
maxDescriptorSetAccelerationStructures is the maximum number of acceleration structure descriptors that can be included in descriptor bindings in a pipeline layout across all pipeline shader stages and descriptor set numbers. Descriptor bindings with a descriptor type of VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR count against this limit. Only descriptor bindings in descriptor set layouts created without the VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT bit set count against this limit.
maxDescriptorSetUpdateAfterBindAccelerationStructures is similar to maxDescriptorSetAccelerationStructures but counts descriptor bindings from descriptor sets created with or without the VK_DESCRIPTOR_SET_LAYOUT_CREATE_UPDATE_AFTER_BIND_POOL_BIT bit set.
minAccelerationStructureScratchOffsetAlignment is the minimum required alignment, in bytes, for scratch data passed in to an acceleration structure build command. The value must be a power of two.

Description

Due to the fact that the geometry, instance, and primitive counts are specified at acceleration structure creation as 32-bit values, maxGeometryCount, maxInstanceCount, and maxPrimitiveCount must not exceed 2³²-1.

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

Limits specified by this structure must match those specified with the same name in VkPhysicalDeviceRayTracingPropertiesNV.

Valid Usage (Implicit)

VUID-VkPhysicalDeviceAccelerationStructurePropertiesKHR-sType-sType
sType must be VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_ACCELERATION_STRUCTURE_PROPERTIES_KHR

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.