| Hans Goudey (HooglyBoogly) |
| Hans Goudey (HooglyBoogly) | |
| May 13 2020, 3:35 PM |
| Brecht Van Lommel (brecht) |
| Christian Rauch (christian.rauch) |
| Hans Goudey (HooglyBoogly) |
System Information
Operating system: Fedora 32
Graphics card: Mesa Intel UHD Graphics 620 (KBL GT2)
Blender Version
Broken: master WITH_GHOST_WAYLAND
Worked: never
Short description of error
When build with Wayland and running on it, panel animation only updates when the mouse is moved over the Blender window.
Exact steps for others to reproduce the error
Drag a panel in the properties area and let them animate back.
With Wayland
XWayland
| rB Blender | |||
| D7658 wayland: repeat key on key press and hold | |||
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Confirmed | TO DO | None | T76428 GHOST/Wayland Support | ||
| Resolved | TO DO | Hans Goudey (HooglyBoogly) | T76720 GHOST/Wayland WM Timer Problems |
The problem is basically that the event handling in GHOST_SystemWayland::processEvents by wl_display_dispatch blocks until new events have been received from the compositor. This is fine and efficient of the UI only has to respond to input events etc. but obviously does not work with animations or other input independent UI events.
A non-blocking alternative, such as wl_display_roundtrip, will fix this the animation issue but will result in a "busy loop" that consumes a lot of CPU.
I will have to look into another solution for this. I think a big problem is that event handling and interface rendering happens in the same thread, but that the UI drawing is not throttled by the monitor update rate.
@Hans Goudey (HooglyBoogly) This should be solved by https://developer.blender.org/D7658. Can you confirm and close this if applicable?