# VkSwapchainTimingPropertiesEXT(3) Manual Page

## Name

VkSwapchainTimingPropertiesEXT - Structure containing the RC duration of a display

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## C Specification

The `VkSwapchainTimingPropertiesEXT` structure is defined as:

    // Provided by VK_EXT_present_timing
    typedef struct VkSwapchainTimingPropertiesEXT {
        VkStructureType    sType;
        void*              pNext;
        uint64_t           refreshDuration;
        uint64_t           refreshInterval;
    } VkSwapchainTimingPropertiesEXT;

## Members

- `sType` is a VkStructureType value identifying this structure.

- `pNext` is `NULL` or a pointer to a structure extending this structure.

- `refreshDuration` is zero or an indication of the duration of a refresh cycle.

- `refreshInterval` is zero or a duration in nanoseconds indicating the interval between refresh cycle durations.

## Description

If `refreshDuration` is zero, the presentation engine is not able to determine the duration of the refresh cycle. Similarly, if `refreshInterval` is zero, the presentation engine is not able to determine whether it is operating in VRR mode.

Otherwise, if `refreshInterval` is the same as `refreshDuration`, the presentation engine is operating in FRR mode. In this case, `refreshDuration` is the number of nanoseconds from the start of one refresh cycle to the start of the next refresh cycle.

If `refreshInterval` is `UINT64_MAX`, the presentation engine is operating in VRR mode, and `refreshDuration` is the minimum number of nanoseconds from the start of one refresh cycle to the start of the next refresh cycle.

If `refreshDuration` and `refreshInterval` are not zero, `refreshInterval` is a factor of `refreshDuration`.

Valid Usage (Implicit)

- VUID-VkSwapchainTimingPropertiesEXT-sType-sType
  `sType` must be `VK_STRUCTURE_TYPE_SWAPCHAIN_TIMING_PROPERTIES_EXT`

- VUID-VkSwapchainTimingPropertiesEXT-pNext-pNext
  `pNext` must be `NULL`

## See Also

VK_EXT_present_timing, VkStructureType, vkGetSwapchainTimingPropertiesEXT

## 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 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0