# VkDescriptorUpdateTemplateEntry(3) Manual Page

## Name

VkDescriptorUpdateTemplateEntry - Describes a single descriptor update of the descriptor update template

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## C Specification

The `VkDescriptorUpdateTemplateEntry` structure is defined as:

    // Provided by VK_VERSION_1_1
    typedef struct VkDescriptorUpdateTemplateEntry {
        uint32_t            dstBinding;
        uint32_t            dstArrayElement;
        uint32_t            descriptorCount;
        VkDescriptorType    descriptorType;
        size_t              offset;
        size_t              stride;
    } VkDescriptorUpdateTemplateEntry;

or the equivalent

    // Provided by VK_KHR_descriptor_update_template
    typedef VkDescriptorUpdateTemplateEntry VkDescriptorUpdateTemplateEntryKHR;

## Members

- `dstBinding` is the descriptor binding to update when using this descriptor update template.

- `dstArrayElement` is the starting element in the array belonging to `dstBinding`. If the descriptor binding identified by `dstBinding` has a descriptor type of `VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK` then `dstArrayElement` specifies the starting byte offset to update.

- `descriptorCount` is the number of descriptors to update. If `descriptorCount` is greater than the number of remaining array elements in the destination binding, those affect consecutive bindings in a manner similar to VkWriteDescriptorSet above. If the descriptor binding identified by `dstBinding` has a descriptor type of `VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK` then `descriptorCount` specifies the number of bytes to update and the remaining array elements in the destination binding refer to the remaining number of bytes in it.

- `descriptorType` is a VkDescriptorType specifying the type of the descriptor.

- `offset` is the offset in bytes of the first binding in the raw data structure.

- `stride` is the stride in bytes between two consecutive array elements of the descriptor update information in the raw data structure. The actual pointer ptr for each array element j of update entry i is computed using the following formula:

          const char *ptr = (const char *)pData + pDescriptorUpdateEntries[i].offset + j * pDescriptorUpdateEntries[i].stride

  The stride is useful in case the bindings are stored in structs along with other data. If `descriptorType` is `VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK` then the value of `stride` is ignored and the stride is assumed to be `1`, i.e. the descriptor update information for them is always specified as a contiguous range.

## Description

Valid Usage

- VUID-VkDescriptorUpdateTemplateEntry-dstBinding-00354
  `dstBinding` must be a valid binding in the descriptor set layout implicitly specified when using a descriptor update template to update descriptors

- VUID-VkDescriptorUpdateTemplateEntry-dstArrayElement-00355
  `dstArrayElement` and `descriptorCount` must be less than or equal to the number of array elements in the descriptor set binding implicitly specified when using a descriptor update template to update descriptors, and all applicable consecutive bindings

- VUID-VkDescriptorUpdateTemplateEntry-descriptor-02226
  If `descriptor` type is `VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK`, `dstArrayElement` must be an integer multiple of `4`

- VUID-VkDescriptorUpdateTemplateEntry-descriptor-02227
  If `descriptor` type is `VK_DESCRIPTOR_TYPE_INLINE_UNIFORM_BLOCK`, `descriptorCount` must be an integer multiple of `4`

Valid Usage (Implicit)

- VUID-VkDescriptorUpdateTemplateEntry-descriptorType-parameter
  `descriptorType` must be a valid VkDescriptorType value

## See Also

VK_VERSION_1_1, VkDescriptorType, VkDescriptorUpdateTemplateCreateInfo

## 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