C Specification

The VkPresentIdKHR structure is defined as:

// Provided by VK_KHR_present_id
typedef struct VkPresentIdKHR {
    VkStructureType    sType;
    const void*        pNext;
    uint32_t           swapchainCount;
    const uint64_t*    pPresentIds;
} VkPresentIdKHR;

Members

  • sType is a VkStructureType value identifying this structure.

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

  • swapchainCount is the number of swapchains being presented to the vkQueuePresentKHR command.

  • pPresentIds is NULL or a pointer to an array of uint64_t with swapchainCount entries. If not NULL, each non-zero value in pPresentIds specifies the present id to be associated with the presentation of the swapchain with the same index in the vkQueuePresentKHR call.

Description

For applications to be able to reference specific presentation events queued by a call to vkQueuePresentKHR, an identifier needs to be associated with them. When the presentId feature is enabled, applications can include the VkPresentIdKHR structure in the pNext chain of the VkPresentInfoKHR structure to supply identifiers.

Each VkSwapchainKHR has a presentId associated with it. This value is initially set to zero when the VkSwapchainKHR is created.

When a VkPresentIdKHR structure with a non-NULL pPresentIds is included in the pNext chain of a VkPresentInfoKHR structure, each pSwapchains entry has a presentId associated in the pPresentIds array at the same index as the swapchain in the pSwapchains array. If this presentId is non-zero, then the application can later use this value to refer to that image presentation. A value of zero indicates that this presentation has no associated presentId. A non-zero presentId must be greater than any non-zero presentId passed previously by the application for the same swapchain.

There is no requirement for any precise timing relationship between the presentation of the image to the user and the update of the presentId value, but implementations should make this as close as possible to the presentation of the first pixel in the new image to the user.

Valid Usage

  • VUID-VkPresentIdKHR-swapchainCount-04998
    swapchainCount must be the same value as VkPresentInfoKHR::swapchainCount, where this VkPresentIdKHR is in the pNext chain of the VkPresentInfoKHR structure

  • VUID-VkPresentIdKHR-presentIds-04999
    Each presentIds entry must be greater than any previous presentIds entry passed for the associated pSwapchains entry

Valid Usage (Implicit)

  • VUID-VkPresentIdKHR-sType-sType
    sType must be VK_STRUCTURE_TYPE_PRESENT_ID_KHR

  • VUID-VkPresentIdKHR-pPresentIds-parameter
    If pPresentIds is not NULL, pPresentIds must be a valid pointer to an array of swapchainCount uint64_t values

  • VUID-VkPresentIdKHR-swapchainCount-arraylength
    swapchainCount must be greater than 0

See Also

VK_KHR_present_id, 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