[Octave-bug-tracker] [bug #62660] Cannot see a plot on qt graphics on 7.1.0 windows

[Giuseppe Baffi]

Follow-up Comment #17, bug #62660 (project octave):

Hello everybody 

I have a Thinkpad x220, with Intel HD 3000. 

I did several tests with Octave 6.4.0, 7.3.0 and the nightly build 8.0.1
(2022.11.19). 

When using fltk graphic toolkit all versions of octave work flawlessly. 

When using qt graphic toolkit version 6.4.0 works as expected, whereas version
7.3.0 and 8.0.1 open the plot window, but nothing is shown. 

When renaming “opengl32.dll” to “__opengl32.dll” the Intel HD 3000
driver is recognized, regardless of the selected graphic toolkit. 

When using fltk graphic toolkit all versions work flawlessly, however the
output of “__opengl_info__” shows a difference in the opengl version and
vendor, VMware for version 6.4.0 and Mesa/X.org for 7.3.0 and 8.0.1. 

Could it be the reason for the behaviour of the qt graphic toolkit? 

Below is the output of __opengl_info__ in the different tests. 

Regards 

%---------------------------------------------------------------------%
Octave 8.0.1 
nightly build 2022.11.19 

>> graphics_toolkit("qt")
>> __opengl_info__()
warning: __opengl_info__: can not obtain OpenGL information
warning: called from
    __opengl_info__ at line 65 column 5

>> graphics_toolkit("fltk")
>> __opengl_info__()
   version: 3.1 Mesa 21.2.6
    vendor: Mesa/X.org
  renderer: llvmpipe (LLVM 12.0.1, 256 bits)


%---------------------------------------------------------------------%
Octave 8.0.1 
nightly build 2022.11.19 
after renaming "opengl32.dll" to "__opengl32.dll"

>> graphics_toolkit("qt")
>> __opengl_info__()
warning: __opengl_info__: can not obtain OpenGL information
warning: called from
    __opengl_info__ at line 65 column 5 

>> graphics_toolkit("fltk")
>> __opengl_info__()
   version: 3.1.0 - Build 9.17.10.4459
    vendor: Intel
  renderer: Intel(R) HD Graphics 3000 


%---------------------------------------------------------------------%
Octave 7.3.0 
original 

>> graphics_toolkit("qt")
>> __opengl_info__()
warning: __opengl_info__: can not obtain OpenGL information
warning: called from
    __opengl_info__ at line 65 column 5 

>> graphics_toolkit("fltk")
>> __opengl_info__()
   version: 3.1 Mesa 21.2.6
    vendor: Mesa/X.org
  renderer: llvmpipe (LLVM 12.0.1, 256 bits)


%---------------------------------------------------------------------%
Octave 7.3.0 
after renaming "opengl32.dll" to "__opengl32.dll"

>> graphics_toolkit("qt")
>> __opengl_info__()
warning: __opengl_info__: can not obtain OpenGL information
warning: called from
    __opengl_info__ at line 65 column 5 

>> graphics_toolkit("fltk")
>> __opengl_info__()
   version: 3.1.0 - Build 9.17.10.4459
    vendor: Intel
  renderer: Intel(R) HD Graphics 3000 


%---------------------------------------------------------------------%
Octave 6.4.0 

>> graphics_toolkit("qt")
>> __opengl_info__
   version: 3.1 Mesa 20.1.10
    vendor: VMware, Inc.
  renderer: llvmpipe (LLVM 7.1.0, 256 bits)

>> graphics_toolkit("fltk")
>> __opengl_info__
   version: 3.1 Mesa 20.1.10
    vendor: VMware, Inc.
  renderer: llvmpipe (LLVM 7.1.0, 256 bits)


%---------------------------------------------------------------------%
Octave 6.4.0 
after renaming "opengl32.dll" to "__opengl32.dll"

>> graphics_toolkit("qt")
>> __opengl_info__
   version: 3.1.0 - Build 9.17.10.4459
    vendor: Intel
  renderer: Intel(R) HD Graphics 3000 

>> graphics_toolkit("fltk")
>> __opengl_info__
   version: 3.1.0 - Build 9.17.10.4459
    vendor: Intel
  renderer: Intel(R) HD Graphics 3000 





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