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Re: octave says WGL_ARB_multisample is missing
- From: Jon Turney <jon dot turney at dronecode dot org dot uk>
- To: The Cygwin Mailing List <cygwin at cygwin dot com>
- Cc: William Mitchell <wfmacmd at gmail dot com>
- Date: Tue, 26 Jun 2018 21:33:17 +0100
- Subject: Re: octave says WGL_ARB_multisample is missing
- References: <CAL_Y+kzuDhMkibJ8mD0RkidG=kXbg0_5bV6wwq0Xuy5UgQeefg@mail.gmail.com>
- Reply-to: The Cygwin Mailing List <cygwin at cygwin dot com>
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.
Install/upgrade the display driver
Use software rendering by setting the LIBGL_ALWAYS_SOFTWARE environment
(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
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
Volunteer Cygwin/X X Server maintainer
Problem reports: http://cygwin.com/problems.html
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