Linux framebuffer debugging on host machine (WSL)

[igiona]

Hi

is it possible to debug the Linux Framebuffer head via WSL?
If yes, how?

If a simply run the debugger from within VisualStudio on WSL I get this error

System.InvalidOperationException: 'Cannot read keys when either application does not have a console or when console input has been redirected. Try Console.Read.'

[jeromelaban]

Thanks for the question.

As far as we know, it's not possible to run framebuffer apps in WSL, as there's no available framebuffer to render to. You'll need to run on an actual device.

[igiona]

Thank you for the quick feedback.

I have found an emulator https://sixpak.org/fbe/ which actually builds& runs after installing and configuring VcXsrv on windows and XFCE on WSL.
The question would be now how it is possible to tell the Uno app to use /tmp/fbe_buffer as "driver" I guess?

[jeromelaban]

Thanks. It seems that FBE only supports 8 bits color palette, a mode that Uno does not support at this time. Still, if you find a framebuffer emulator that works with 16 or 24bpp modes, you can specify the framebuffer using the FRAMEBUFFER environment variable.

As for the original error message, this particular mode is hard-coded here:

uno/src/Uno.UI.Runtime.Skia.Linux.FrameBuffer/FramebufferHost.cs

Line 79 in a4d04ac

Console.ReadKey(true);

.

You may still be able to debug the process by starting it using the terminal, then attach to the process instead of launching it.