vkGetSwapchainCounterEXT(3)

# vkGetSwapchainCounterEXT(3) Manual Page

## Name

vkGetSwapchainCounterEXT - Query the current value of a surface counter

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## C Specification

The requested counters become active when the first presentation command for the associated swapchain is processed by the presentation engine. To query the value of an active counter, use:

    // Provided by VK_EXT_display_control
    VkResult vkGetSwapchainCounterEXT(
        VkDevice                                    device,
        VkSwapchainKHR                              swapchain,
        VkSurfaceCounterFlagBitsEXT                 counter,
        uint64_t*                                   pCounterValue);

## Parameters

- `device` is the VkDevice associated with `swapchain`.

- `swapchain` is the swapchain from which to query the counter value.

- `counter` is a VkSurfaceCounterFlagBitsEXT value specifying the counter to query.

- `pCounterValue` will return the current value of the counter.

## Description

If a counter is not available because the swapchain is out of date, the implementation may return `VK_ERROR_OUT_OF_DATE_KHR`.

Valid Usage

- VUID-vkGetSwapchainCounterEXT-swapchain-01245
  One or more present commands on `swapchain` must have been processed by the presentation engine

Valid Usage (Implicit)

- VUID-vkGetSwapchainCounterEXT-device-parameter
  `device` must be a valid VkDevice handle

- VUID-vkGetSwapchainCounterEXT-swapchain-parameter
  `swapchain` must be a valid VkSwapchainKHR handle

- VUID-vkGetSwapchainCounterEXT-counter-parameter
  `counter` must be a valid VkSurfaceCounterFlagBitsEXT value

- VUID-vkGetSwapchainCounterEXT-pCounterValue-parameter
  `pCounterValue` must be a valid pointer to a `uint64_t` value

- VUID-vkGetSwapchainCounterEXT-swapchain-parent
  `swapchain` must have been created, allocated, or retrieved from `device`

Return Codes

On success, this command returns

  - `VK_SUCCESS`

On failure, this command returns

  - `VK_ERROR_OUT_OF_HOST_MEMORY`

  - `VK_ERROR_DEVICE_LOST`

  - `VK_ERROR_OUT_OF_DATE_KHR`

## See Also

VK_EXT_display_control, VkDevice, VkSurfaceCounterFlagBitsEXT, VkSwapchainKHR

## 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