VK_GOOGLE_display_timing May Be A Big Help For Vulkan Games
Written by Michael Larabel in Linux Gaming on 31 March 2018 at 07:02 AM EDT. 2 Comments
LINUX GAMING --
In going through the GDC 2018 videos and slides now available, one of the most interesting sessions is Alen Ladavac of Croteam talking about frame stuttering and in particular how his company is working to overcome it thanks in part to Vulkan's VK_GOOGLE_display_timing extension.

Croteam has been experimenting with Vulkan's VK_GOOGLE_display_timing extension in Talos Principle and Serious Sam Fusion for being able to obtain accurate timing information and to be able to schedule future frames appropriately. VK_GOOGLE_display_timing has been around since Vulkan 1.0.43 and allows for obtaining information on the presentation engine's display with timing information, etc.

Even with lower frame-rates, if presenting smoother frames like via Vulkan's VK_GOOGLE_display_timing, the experience may be better than higher frame-rates but with possible stuttering. With Croteam's games making use of VK_GOOGLE_display_timing for making more informed rendering decisions, they have found a better experience with less micro-stuttering.

Unfortunately the adoption of VK_GOOGLE_display_timing is limited so far with some Android devices and then the RADV Mesa driver. For those that forgot, the timing extension was recently worked on by Keith Packard under contract for Valve. Croteam would like to see all Vulkan drivers implement VK_GOOGLE_display_timing "ASAP!"

Those wanting to dig in deeper can find the slide deck while a better video recording of the session is said to be made available soon.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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