# VkWriteDescriptorSetAccelerationStructureKHR(3) Manual Page

## Name

VkWriteDescriptorSetAccelerationStructureKHR - Structure specifying acceleration structure descriptor info

## C Specification

The `VkWriteDescriptorSetAccelerationStructureKHR` structure is defined as:

    typedef struct VkWriteDescriptorSetAccelerationStructureKHR {
        VkStructureType                      sType;
        const void*                          pNext;
        uint32_t                             accelerationStructureCount;
        const VkAccelerationStructureKHR*    pAccelerationStructures;
    } VkWriteDescriptorSetAccelerationStructureKHR;

or the equivalent

    typedef VkWriteDescriptorSetAccelerationStructureKHR VkWriteDescriptorSetAccelerationStructureNV;

## Members

- `sType` is the type of this structure.

- `pNext` is `NULL` or a pointer to an extension-specific structure.

- `accelerationStructureCount` is the number of elements in `pAccelerationStructures`.

- `pAccelerationStructures` are the acceleration structures to update.

## Description

Valid Usage

- `accelerationStructureCount` must be equal to `descriptorCount` in the extended structure

- Each acceleration structure in `pAccelerationStructures` must have been created with `VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR`

Valid Usage (Implicit)

- `sType` must be `VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET_ACCELERATION_STRUCTURE_KHR`

- `pAccelerationStructures` must be a valid pointer to an array of `accelerationStructureCount` valid VkAccelerationStructureKHR handles

- `accelerationStructureCount` must be greater than `0`

## See Also

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