[Interest] [Windows][opengl] How graphic card is choosen on a portable computer with many?

[Xavier Bigand]

I think I finally found the solution on stackoverflow

For Nvidia :

// enable optimus!extern "C" {
    _declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;}

And for AMD :

extern "C"
  {
    __declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
  }


Now I just need to found the corresponding configuration to test.

If it works it would be just perfect.

2016-06-22 23:44 GMT+02:00 Jérôme Godbout <jerome at bodycad.com>:

> I'm guessing ActiveX may have more options to select the proper card but I
> may be wrong on this. I'm also curious about this, we are supporting Intel
> GPU but since we have an heavy CAD application, we always switch the card
> to the AMD/NVidia one. I would love an option or way to select this before
> the first OpenGL context is created too, that would be a lovely features.
> Not sure if other platforms allow this??? I known macOS can switch video
> card, but I think it's transparent to the user or application (maybe that's
> explain the old OpenGL version they are using!).
>
> I'm pretty sure it must be possible under Linux, but I never try it or did
> it.
>
> On Wed, Jun 22, 2016 at 3:49 PM, Xavier Bigand <flamaros.xavier at gmail.com>
> wrote:
>
>> Wow, it seems complicated. I prefer a transparent solution for users, I
>> think that it will be relatively easy to find an OpenGL feature to filter
>> the cards (but I need to get a such configuration before :-().
>>
>> I thought that it could be similar than scanning screen or something like
>> that. I am expecting that we could select the right card during the window
>> or the opengl context creation.
>> I am curious on how video games are doing to be always launched on the
>> right card.
>>
>>
>> 2016-06-22 21:25 GMT+02:00 Jérôme Godbout <jerome at bodycad.com>:
>>
>>> I don't think you can select this before the aplication is launch, it's
>>> Windows and the video driver that choose that for you. You could however,
>>> have a small launcher or a checker on application launch with the OpenGL
>>> card used (maybe inspect the QSurface format or anything that could point
>>> to if the wanted OpenGL features is available).
>>>
>>> you can execute the following batch script to get the video card
>>> ///////// VideoCardIdentifier.bat
>>> *@echo off*
>>> *for /F "tokens=* skip=1" %%n in ('WMIC path Win32_VideoController get
>>> Name ^| findstr "."') do set GPU_NAME=%%n*
>>> *echo %GPU_NAME%*
>>> ///////// END VideoCardIdentifier.bat
>>>
>>> should output something like that:
>>> *AMD Radeon R9 200 Series*
>>>
>>> use a regex to parse the output to detect the available card type.
>>>
>>> You could show an error dialog and stop at this point and tell the
>>> requirement to your user. I would point. depending on the nvidia or AMD
>>> card detected, you could try to launch the proper panel and display the
>>> instruction to change it or give a link to do it.
>>>
>>>
>>> On Wed, Jun 22, 2016 at 12:35 PM, Xavier Bigand <
>>> flamaros.xavier at gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> Some of users can't launch our application because there computer have
>>>> 2 graphic cards. To fix the issue they have to force the card made for
>>>> gaming to be used with our software.
>>>> Our application is made with Qt and QML, but we have our custom 3D
>>>> engine that do not work on intel integrated GPU. One particularity of our
>>>> engine is that it doesn't request a draw every time dislike games.
>>>>
>>>>
>>>> Is there a way for us to make the application able to discover the best
>>>> graphic card and force his usage?
>>>>
>>>>
>>>> --
>>>> Xavier
>>>>
>>>> _______________________________________________
>>>> Interest mailing list
>>>> Interest at qt-project.org
>>>> http://lists.qt-project.org/mailman/listinfo/interest
>>>>
>>>>
>>>
>>
>>
>> --
>> Xavier
>>
>
>


-- 
Xavier
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