mouseX, mouseY not working on rpi5

1

I built SuperCollider, i think 3.14.0, on my Raspberry 5. I can’t get the MouseX or MouseY commands to work although my Mouse works appropriately otherwise. What’s the deal?

               Thanks in Advance
2

MouseX / MouseY don’t work under Wayland display server (they work under X11). I don’t have RPi myself but I’m guessing that the default distribution has moved to Wayland.

We don’t have a solution to this, as it is not possible to simply grab mouse/keyboard input under Wayland.

3

Rpi can either use x11 or wayland. I opted for wayland because it was newer, not knowing it would break something in SuperCollider. I switched back and MouseX and MouseY work as expected. I also get to have x11 fractal screensavers, which I was missing in Wayland.

                Thanks
4

Maybe we can add a comment to the documentation of MouseX | SuperCollider 3.14.0-dev Help and MouseY? I think there will be more and more people using Wayland in the future.

5

I think so. Actually, I suggested that last year.

6

Good point. Anybody willing to make a PR or an issue about it?

7

Done Add documentation about wayland incompatibility of keyboard/mouse UGens by capital-G · Pull Request #6719 · supercollider/supercollider · GitHub

8

I think the mouseOverAction method for View could sometimes be used as an alternative, although it is slow and imprecise when the mouse pointer moves quickly.

Does it work in Wayland?

(
var bounds = Window.screenBounds;
var width = bounds.width / 2;
var height = bounds.height / 2;
var synth = { |freq, pan| 
	Pan2.ar(SinOsc.ar(freq.lag.poll, pan.lag.poll)) * 0.1
}.play;
w = Window("", Rect(200, 200, width, height).debug);
w.acceptsMouseOver_(true)
.onClose_{synth.free}
.front;

w.asView
.mouseOverAction_ { |view, x, y|
	[x, y].postln; // only for test
	synth.set(
		\freq, y.linexp(0, height -1, 440 * 4, 440),
		\pan, x.linlin(1, width - 1, -1, 1)
	)
}
)
9

Generally iiuc it’s possible capture mouse using a window etc. whether using SC GUI or something else. But MouseX works by capturing mouse movement without a window underneath and that’s not possible in Wayland. Having to have a window underneath for this to work is not really a comfortable workaround…

1 Like