wlroots-hyprland/backend/drm
Simon Ser 348f52b5fc output: remove wlr_output_impl.schedule_frame
This function allowed backends to provide a custom function for frame
scheduling. Before resuming the rendering loop, the DRM and Wayland
backends would wait for vsync.

There isn't a clear benefit of doing this. The only upside is that we
get more stable timings: the delay between two repaints doesn't change too
much and is close to a mutliple of the refresh rate.

However this introduces latency, especially when a client misses a
frame. For instance a fullscreen game missing vblank will need to wait
more than a whole frame before being able to display new content. This
worst case scenario happens as follows:

- Client is still rendering its frame and cannot submit it in time
- Deadline is reached
- Compositor decides to stop the rendering loop since nothing changed on
  screen
- Client finally manages to render its frame, submits it
- Compositor calls wlr_output_schedule_frame
- DRM backend waits for next vblank
- The wlr_output frame event is fired, compositor draws new content on screen
- On the second next vblank, the new content reaches the screen

With this patch, the wlr_output frame event is fired immediately when
the client submits its late frame.

This change also makes it easier to support variable refresh rate, since
VRR is all about being able to present too-late frames earlier.

References: https://github.com/swaywm/wlroots/issues/1925
2020-03-04 03:22:19 +01:00
..
atomic.c Add -Wmissing-prototypes 2019-11-20 02:05:03 +00:00
backend.c backend/drm: don't modeset with a NULL mode after TTY switch 2019-12-30 14:32:37 -07:00
cvt.c backend/drm: add support for custom modes 2019-10-27 10:46:47 -04:00
drm.c output: remove wlr_output_impl.schedule_frame 2020-03-04 03:22:19 +01:00
legacy.c Add -Wmissing-prototypes 2019-11-20 02:05:03 +00:00
meson.build meson: Various improvements 2019-12-23 07:48:29 -05:00
properties.c backend/drm: check format when scanning out DMA-BUF 2019-06-07 09:06:11 -04:00
renderer.c Refactor EGL/GL API loading 2019-12-20 01:03:34 +00:00
util.c backend/drm: add BenQ to manufacturer list 2019-12-11 08:18:45 -05:00