Hi
Yes, I have tried this before and only get black background.
I have reported a bug
: https://bugreports.qt-project.org/browse/QTBUG-24707 (I am not sure whether
this should be a bug or a task).
I just want to make QQuickView with translucent bakcground work(with OpenGL as
backend is the best but Raster is also ok).
Because windows XP doesn't support pixel alpha blending with OpenGL so maybe
we can't make QQuickView work translucently in Xp with OpenGL backend, but we
can do that in Vista or win7 Using dwmapi.dll to support that.
I am not familiar with the new QQuickView structure, so I don't know what is
the best way to make QQuickView with translucent background work in Win7 and
Xp(with OpenGL the best), may you tell me what should I do or forward this
question to some person who is in charge of QQuickView and Scene Graph?
Thank you^_^
________________________________
From: "[email protected]" <[email protected]>
To: [email protected]
Cc: [email protected]; [email protected]
Sent: Sunday, March 11, 2012 5:32 PM
Subject: Re: [Development] Qt Quick2 OpenGL or Raster translucent window
Hi
Have you tried something like this:
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
QSurfaceFormat f;
f.setSamples(16); // if you want AA as well
f.setAlphaBufferSize(8); // turn on alpha
QQuickView view;
view.setFormat(f);
view.setSource(QUrl::fromLocalFile(QLatin1String("/path/to/my.qml"));
view.show();
return app.exec();
}
I don't have a windows box handy to try this on, but give it a try.
As far as I know qmlscene doesnt know how to run with an alpha enabled GL
context.
Regards
Sarah Smith
Senior Engineer Team Lead Qt3D
Nokia Qt Development Frameworks
Mobile: +61 448 283 476
[email protected]
On 11/03/2012, at 3:13 AM, ext hailong geng wrote:
Hi
>I have searched the Internet these two days and I find that it seems
>impossible to draw translucent window in Windows XP by OpenGL, because it
>doesn't support pixel alpha blending. So does Qt have found a way to do that
>for Windows XP?
>Or Qt Quick2 just ignore the translucent function for Window which use OpenGL
>as backend, or even with Raster backend, I tried to set alpha channel and
>use RasterSurface but QQuickView just crashed.(maybe RasterSurface backend
>is not finished?)
>
>
>For Windows Vista and newer windows version, there is DWMAPI which will
>support translucent opengl on desktop, you can see this
>demo, http://www.youtube.com/watch?v=4qWKSYWIqdk, this is cool, isn't it ^_^
>So shall Qt support translucent OpenGL window for Windows Vista and any newer
>version?
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