On 21/06/2022 12:18, Takashi Yano wrote:
On Tue, 21 Jun 2022 19:48:09 +0900 (JST)
Tatsuro MATSUOKA wrote:
From: "Takashi Yano"
To: "cygwin>
Cc: "Tatsuro MATSUOKA"
Date: 2022/06/21 火 18:45
Subject: Re: fltk does not work on cygwin version octave-6.4.0
On Tue, 21 Jun 2022 14:15:12 +0900 (JST)
Tatsuro MATSUOKA wrote:
fltk does not work on cygwin version octave-6.4.0
octave:1> graphics_toolkit fltk
octave:2> plot(1:10);
Insufficient GL support
error: unable to plot due to insufficient OpenGL support
plot windows flashes and disappear immediately
[...]
However, it works as expected, except that the following error message
appears.
libGL error: Windows-DRI extention disabled for GDI Generic renderer
$ env LIBGL_ALWAYS_SOFTWARE=1 octave
octave:1> graphics_toolkit fltk
octave:2> plot(1:10);
also works.
Unfortunately, LIBGL_ALWAYS_SOFTWARE doesn't behave the same everywhere,
since the set of GLX visuals available with it is based on those
available for direct rendering.
This seems similar to [1], which I made some changes in libGL to try to
address, but unfortunately that seems to never been resolved to a root
cause.
The "Insufficient GL support" message comes from octave, but since it
doesn't say what GL support it needs but thinks is missing, it's hard to
tell what the problem actually is.
I guess finding where that comes from in the octave source code would be
a good starting place.
[1] https://cygwin.com/pipermail/cygwin/2018-June/237659.html
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