the display sync stuff i added was probing whether vsync was actually working, but it was measuring the wrong thing. during the probe we software-cap at 60 for safety, and the probe was looking at the gap between frames... which includes the sleep 😅 ..... so it always looked like sync was fine even when the driver was ignoring it. on something like the ally x on windows thats a real problem. vsync says on, probe says gated, we lift the cap and snap logic to the panel hz, then youre basically uncapped. at 2–4x that turns into hitching, dropped frames, dropped input, that weird half second freeze. speed swapping wasnt desyncing the driver, it was just making the bad path hurt more.
the solution is just we time present() itself now, not the gap after it, this way the warmup sleep cant fake a pass. if sync is unclear or broken we just stay on a capped 60 and dont snap logic. Also fixed fixedstep so it snaps wall clock dt before applying speed, so in general the 2-4x speed swaps dont screw the pacing math anymore
- Introduced PresentSync module to manage display synchronization.
- Updated love.run() to handle display changes and resizing events with PresentSync.
- Enhanced FrameCap logic to accommodate PresentSync requirements.
- Modified VSync to report effective states and handle driver quirks.
- Updated options menus to reflect PresentSync availability and restrictions.
- Added tests to validate PresentSync functionality and its interaction with VSync settings.
should address issue #1910 and issue #1958
1jamie