[Interest] How to make WARP as fallback after d3d11 fails

[Yuchen Deng]

hi, Kai, Many thanks for you help.
I've changed the blacklist file like this, and it's solved my requires.

> diff --git a/src/plugins/platforms/windows/openglblacklists/default.json
>> b/src/plugins/platforms/windows/openglblacklists/default.json
>
> index 1e00da5..a88de6e 100644
>
> --- a/src/plugins/platforms/windows/openglblacklists/default.json
>
> +++ b/src/plugins/platforms/windows/openglblacklists/default.json
>
> @@ -28,7 +28,7 @@
>
>              },
>
>              "features": [
>
>                  "disable_desktopgl",
>
> -                "disable_angle"
>
> +                "disable_d3d9"
>
>              ]
>
>         },
>
>         {
>
> @@ -64,7 +64,7 @@
>
>                 "type": "win"
>
>             },
>
>             "features": [
>
> -               "disable_desktopgl", "disable_angle"
>
> +               "disable_desktopgl", "disable_d3d9"
>
>             ]
>
>          },
>
>          {
>
> @@ -88,7 +88,7 @@
>
>                 "type": "win"
>
>             },
>
>             "features": [
>
> -               "disable_angle"
>
> +               "disable_d3d9"
>
>             ]
>
>          },
>
>          {
>
> @@ -100,7 +100,7 @@
>
>                 "type": "win"
>
>             },
>
>             "features": [
>
> -               "disable_desktopgl", "disable_d3d11", "disable_d3d9"
>
> +               "disable_desktopgl", "disable_d3d9"
>
>             ]
>
>          }
>
>      ]
>
>
>
2017-03-21 16:09 GMT+08:00 Kai Koehne <Kai.Koehne at qt.io>:

> > -----Original Message-----
> > From: Interest [mailto:interest-bounces+kai.koehne=qt.io at qt-project.org]
> > On Behalf Of Yuchen Deng
> > Sent: Tuesday, March 21, 2017 7:14 AM
> > To: interest at qt-project.org
> > Subject: [Interest] How to make WARP as fallback after d3d11 fails
> > hi, everyone, I have a question about OpenGL support on Windows. How can
> > I do make WARP as fallback after d3d11 fails. for now it's depends mesa's
> > opengl32sw if angle's d3d11 fail.
>
> Hi!
>
> The code that implements this logic is in
>
> qtbase\src\plugins\platforms\windows\qwindowsopengltester.cpp
>
> ook at QWindowsOpenGLTester::requestedRenderer() and
> QWindowsOpenGLTester::detectSupportedRenderers()
>
> https://code.woboq.org/qt5/qtbase/src/plugins/platforms/
> windows/qwindowsopengltester.cpp.html#_ZN20QWindowsOpenGLTester17requ
> estedRendererEv
>
> > I know to change the environment variable `set QT_OPENGL=angle` and `set
> > QT_ANGLE_PLATFORM=warp` can do that always, but I wanna when d3d11
> > fails then set WARP as fallback not depends any environment variable
> setup.
>
> QWindowsOpenGLTester::detectSupportedRenderers() defines the order in
> which the different OpenGL ES renderers on Windows are evaluated. It also
> shows that there is a blacklist feature that disables certain types. So, if
> you blacklist e.g. D3D9 Qt should directly fall back to D3d11Warp.
>
> https://code.woboq.org/qt5/qtbase/src/plugins/platforms/
> windows/qwindowsopengltester.cpp.html#_ZN20QWindowsOpenGLTester24dete
> ctSupportedRenderersERK14GpuDescriptionb
>
> Hope this helps,
>
> Kai
>



-- 
Best Regards
Yuchen
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