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From:	William Mitchell <wfmacmd AT gmail DOT com>
Date:	Wed, 27 Jun 2018 14:00:53 -0400
Message-ID:	<CAL_Y+kx1XxT8k+aKm0YgoFLTSNfETcy6X06vhu965dKVCBwRsA@mail.gmail.com>
Subject:	Re: octave says WGL_ARB_multisample is missing
To:	The Cygwin Mailing List <cygwin AT cygwin DOT com>
X-IsSubscribed:	yes

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 DOT turney AT dronecode DOT org DOT 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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