1// Copyright 2019-2024 The Khronos Group Inc. 2// 3// SPDX-License-Identifier: CC-BY-4.0 4 5include::{generated}/meta/{refprefix}VK_NV_low_latency2.adoc[] 6 7=== Other Extension Metadata 8 9*Last Modified Date*:: 10 2023-09-25 11*Contributors*:: 12 - Charles Hansen, NVIDIA 13 - Liam Middlebrook, NVIDIA 14 - Lionel Duc, NVIDIA 15 - James Jones, NVIDIA 16 - Eric Sullivan, NVIDIA 17 18include::{generated}/interfaces/VK_NV_low_latency2.adoc[] 19 20=== Description 21 22This extension gives applications timing suggestions on when to start the 23recording of new frames to reduce the latency between input sampling and 24frame presentation. 25Applications can accomplish this through the extension by calling 26flink:vkSetLatencySleepModeNV to allow the driver to pace a given swapchain, 27then calling flink:vkLatencySleepNV before input sampling to delay the start 28of the CPU side work. 29Additional methods and structures are provided to give insight into the 30latency pipeline of an application through the latency markers. 31`apiext:VK_NV_low_latency` provides legacy support for applications that 32make use of the NVIDIA Reflex SDK whereas new implementations should use the 33`apiext:VK_NV_low_latency2` extension. 34 35=== Issues 36 371) How does Low Latency 2 work with applications that utilize device groups? 38 39Low Latency 2 does not support device groups. 40 41=== Version History 42 43 * Revision 2, 2023-11-15 (Charles Hansen) 44 ** Update vkGetLatencyTimingsNV. 45 This is a breaking API change which brings behavior in line with other 46 array querying commands. 47 More background can be found in 48 https://github.com/KhronosGroup/Vulkan-Docs/issues/2269 49 * Revision 1, 2023-09-25 (Charles Hansen) 50 ** Internal revisions 51