vkLatencySleepNV(3)

# vkLatencySleepNV(3) Manual Page

## Name

vkLatencySleepNV - Trigger low latency mode Sleep

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## C Specification

To provide the synchronization primitive used to delay host CPU work for lower latency rendering, call:

    // Provided by VK_NV_low_latency2
    VkResult vkLatencySleepNV(
        VkDevice                                    device,
        VkSwapchainKHR                              swapchain,
        const VkLatencySleepInfoNV*                 pSleepInfo);

## Parameters

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

- `swapchain` is the swapchain to delay associated CPU work based on VkLatencySubmissionPresentIdNV submissions.

- `pSleepInfo` is a pointer to a VkLatencySleepInfoNV structure specifying the parameters of the latency sleep.

## Description

`vkLatencySleepNV` returns immediately. Applications should use vkWaitSemaphores with `pSleepInfo`::`signalSemaphore` to delay host CPU work. CPU work refers to application work done before presenting which includes but is not limited to: input sampling, simulation, command buffer recording, command buffer submission, and present submission. It is recommended to call this function before input sampling. When using this function, it should be called exactly once between presents.

Valid Usage (Implicit)

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

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

- VUID-vkLatencySleepNV-pSleepInfo-parameter
  `pSleepInfo` must be a valid pointer to a valid VkLatencySleepInfoNV structure

- VUID-vkLatencySleepNV-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_UNKNOWN`

## See Also

VK_NV_low_latency2, VkDevice, VkLatencySleepInfoNV, 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 2014-2023 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0