Question for folks who understand GPU APIs such as Metal, like @raph: Is it possible to have traditional vsync behavior without blocking the main (UI) thread for a long time every frame, particularly on macOS? I ask because the default vsync behavior of the Bevy game engine is apparently blocking the main thread on macOS, and this is very bad for accessibility. It's apparently even affecting mouse input for users who aren't using accessibility tools, as discussed here: github.com/bevyengine/bevy/iss…
Mouse events have latency on macos due to a change in accesskit crate · Issue #9391 · bevyengine/bevy
Bevy version 0.11 (anything after #8655) Relevant system information macos 13.5 (22G74) on 2020 M1 Macbook Air What you did I'm running code that uses mouse events, such as the mouse_input example ...GitHub
Raph Levien
in reply to Matt Campbell • • •Yes, without question. What you're talking about is a form of frame pacing, which Metal supports just fine. Many 3D apps do a blocking call to present() because it's so much simpler, and the message still hasn't gone out widely, but it's well known that sacrifices performance in a number of ways, especially input lag.
I should emphasize, it's possible to do non-blocking present without the fancy timing stuff, but by the time you've implemented that, why not get all the gains?
Matt Campbell
in reply to Raph Levien • • •Raph Levien
in reply to Matt Campbell • • •Matt Campbell
in reply to Raph Levien • • •Matt Campbell
in reply to Matt Campbell • • •