Re: [fltk.general] Window maximizing with Fl_Gl_Window - Forums

On Friday, 27 January 2023 at 23:00:20 UTC Albrecht Schlosser wrote:

On 1/27/23 13:55 Lukas Lang wrote:
> I am encountering an issue with maximizing/restoring Windows that
> contain a Fl_Gl_Window: It seems the Fl_Gl_Window is not properly
> redrawn when the Window changes to/from a maximized state. As a
> demonstration, I recorded the behavior of the OpenGL3test.cxx example
> on my Ubuntu 20.04 system:

I just tried the demo on my Linux Mint 20 which is based on Ubuntu 20.04
and it works as expected for maximizing and restoring (and manually
resizing as well). I tried both X11 and Wayland backends, both work fine.

I have no idea why it doesn't work on your (Lukas') system. Maybe an
issue with the OpenGL driver? What graphics adapter do you have, and can
you maybe change the graphics driver or some optimization level?

OK, so I tried a few boxes (and also tried WSL2, since I have my Win11 box running anyway; my WSL2 setup is basically Ubuntu 22.04, FWIW.)

The results were mixed: I have one laptop, with Ubuntu 22.04 with an Intel GPU, that behaves as the OP showed, when running in X11 mode. Running in Wayland mode it is fine, no problem.

Other systems were fine in either X11 or Wayland modes, including WSL2 (though it has its other problems, of course...)

I'd be interested to know what GPU the OP has, along with the questions Albrecht asked; it may be something to do with the Intel GLX drivers, since it does not *appear* to be a specific fltk issue here (or at least, fltk works OK on some systems, at any rate!)