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Date: Wed, 22 Jun 2022 21:33:17 +0200
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Subject: Re: fltk does not work on cygwin version octave-6.4.0
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To: Tatsuro MATSUOKA <matsuoka@nuce.nagoya-u.ac.jp>,
        "cygwin@cygwin.com" <cygwin@cygwin.com>
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From: Marco Atzeri <marco.atzeri@gmail.com>
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On 22.06.2022 12:37, Tatsuro MATSUOKA wrote:
>> ----- Original Message -----
>> From: "Tatsuro MATSUOKA"
>> To: "Marco Atzeri"; "cygwin
>> Date: 2022/06/22 水 12:53
>> Subject: Re: fltk does not work on cygwin version octave-6.4.0
>>>> ----- Original Message -----
>>>> From: "Marco Atzeri"
>>>> To: "cygwin
>>>> Date: 2022/06/22 水 02:06
>>>> Subject: Re: fltk does not work on cygwin version octave-6.4.0
>>>> On 21.06.2022 07:15, 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
>>>>>
>>>>> fltk graphics_toolkit works octave on native windows.

> Is the below related to the issue?
> 
>>> __opengl_info__
> warning: __opengl_info__: can not obtain OpenGL information
> warning: called from
>      __opengl_info__ at line 69 column 5
> 
> Similar behaviors happen qt graphics on octave-7.1.0 on native Windows.
> 
> Tatsuro
> 

Maybe.

On my PC

$ octave

octave:1> __opengl_info__
    version: 4.5.0 - Build 22.20.16.4815
     vendor: Intel
   renderer: Intel(R) UHD Graphics 620
extensions:
   GL_3DFX_texture_compression_FXT1
  .....

Similar to the X log

glWinSelectGLimplementation: Loaded 'cygnativeGLthunk.dll'
(II) AIGLX: Testing pixelFormatIndex 1
GL_VERSION:     4.5.0 - Build 22.20.16.4815
GL_VENDOR:      Intel
GL_RENDERER:    Intel(R) UHD Graphics 620
(II) GLX: enabled GLX_SGI_make_current_read
...

You can test the GL behaviour with

$ cygcheck -l mesa-demos | grep bin
/usr/bin/eglinfo
/usr/bin/es2_info
/usr/bin/glinfo
/usr/bin/glxgears
/usr/bin/glxinfo
/usr/bin/wglgears
/usr/bin/wglinfo
/usr/bin/xeglgears
..

Regards
Marco


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