Will do. On Sun, Oct 14, 2018 at 10:13 AM Jon Turney <jon.tur...@dronecode.org.uk> wrote:
> On 11/10/2018 18:40, Chris Marshall wrote: > > 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 > > 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. > > Interesting. Thanks for reporting this issue. > > I suspect this might be caused by: > > - the X server is marked as high-dpi aware (via manifest) > - when using WGL, OpenGL drawing takes place in the client (to a window > handle retrieved from the X server) > - the GL client you are using is not marked as high-dpi aware (the default) > > (-wgl is only currently supported in multiwindow mode) > > If that's the case, I think I see what is needed to fix this, but this > is not possible for me to test. > > I've built an updated libGL1 with this potential fix, perhaps you can > try it, to see if it improves things. Install it with: > > wget ftp://cygwin.com/pub/cygwinx/x86_64/libGL1-18.0.5-1.1.tar.xz > tar -C / -xvf libGL1-18.0.5-1.1.tar.xz > > (This is built for x86_64. If you need x86 instead, please ask) > > Reinstall the libGL1 using cygwin setup to get things back to their > previous state. > > -- > Jon Turney > Volunteer Cygwin/X X Server maintainer > -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
