Re: Re: octave says WGL_ARB_multisample is missing

[Tatsuro MATSUOKA <tmacchant2@yahoo.co.jp>]

what happens if you install mesa by cygwin setup ?

tatsuro

--- wfmacmd
> Thanks for the suggestions.
> 
> I thought updating the display driver sounded good, since this is a very
> old computer, but when I asked to update the driver it searched for a new
> driver and eventually said my driver is up to date.
> 
> I set LIBGL_ALWAYS_SOFTWARE to 1.  That got rid of the WGL error messages,
> but I still get the other messages:
> Insufficient GL support
> error: unable to plot due to insufficient OpenGL support
> 
> This is harder, because it doesn't tell me _what_ is missing (or
> "insufficient").
> 
> 
> On 26 June 2018 at 16:33, Jon Turney <jon.turney@dronecode.org.uk> wrote:
> 
> > On 26/06/2018 20:27, William Mitchell wrote:
> >
> >> When I run octave on a fresh installation of cygwin64 on a Windows 7
> >> machine, I get the error:
> >>
> >> libGL error: required WGL extension WGL_ARB_multisample is missing
> >>
> >
> > This error is coming from the WGL direct renderer built into libGL on
> > Cygwin, and is telling you that this extension not provided by the Windows
> > display driver you are using.  (This is unusual)
> >
> > It's nothing to do with GLEW or any other cygwin libraries.
> >
> > Possible solutions:
> >
> > Install/upgrade the display driver
> >
> > Use software rendering by setting the LIBGL_ALWAYS_SOFTWARE environment
> > variable
> >
> > (See also https://x.cygwin.com/docs/ug/using-glx.html)
> >
> >
> > Insufficient GL support
> >> error: unable to plot due to insufficient OpenGL support
> >>
> >> octave begins running fine.  The error occurs when it encounters a plot
> >> statement.
> >>
> >> I have had this problem with an old installation of cygwin for at least a
> >> year.  I finally decided to wipe out cygwin and try a fresh installation.
> >> This installation contains the "minimal" default packages plus Devel:
> >> gcc-core, gcc-gfortran, gcc-g++, gdb, mingw64-x86_64-gcc-core,
> >> mingw64-x86_64-gfortran, mingw64-x86_64-g++; Graphics: gnuplot,
> >> ImageMagick; Math: bc, grace, octave; Shells: tcsh; X11: everything.
> >>
> >> I notice that libGLEW is included in the packages that it installs, which
> >> is where I would expect to find the WGL extensions.  This contains
> >> /usr/bin/cygGLEW-2-1.dll, but I don't know how to find out what functions
> >> are in a dll to see if it contains WGL_ARB_multisample.
> >>
> >> Any suggestions on what is wrong with this installation are greatly
> >> appreciated.
> >>
> >
> > --
> > Jon Turney
> > Volunteer Cygwin/X X Server maintainer
> >
> 
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