opengl render size too small in X11 window

[Chris Marshall]

I've verified that if I use the -nowgl option for the X11 server then the
opengl visualization is correctly rendered and sized for the containing
window.

On Wed, Oct 10, 2018 at 12:15 PM Chris Marshall <devel.chm.01@gmail.com>
wrote:

> Dear Cygwin-
>
> Using cygwin X11 under windows 10 with a high dpi display (3840x2160)
> laptop resulted in far too small font and widgets using -multiwindow for
> the XWin option.  If I set the windows setting display resolution to
> 1920x1080 and following the suggestion for the ~/.Xresources file from
> https://stackoverflow.com/questions/42211564/cygwin-xwin-scaling-broken-when-using-windows-scaling-on-high-resolution-displa
> I was able keep windows, widgets, and title/menu bars at a reasonable size
> for reading.
>
> However, when I display some OpenGL graphics content (using a FreeGLUT
> window), then the visible OpenGL rendered area is about 2/3 the apparent
> widget area of the X11 window.  If I try the same in a non-multiwindow Xwin
> session then the rendered area is correct.  This problem is even worse if I
> try with the full screen resolution.  At the moment I think I have narrowed
> it down to the -multiwindow support for OpenGL contexts.
>
> This is with a couple of versions of the freeglut libraries with no effect
> and the current cygwin and cygwin X Server.
>
> Thanks,
> Chris
>
>
>

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