+1 on this please is someone working on something like QNativeGraphics, which picks the best impl under the hood? eg: metal for macos, opengl for linux, and whatever it is now for windows?
the writing is on the wall for OpenGL on mac, what are the future plans for that? > On Nov 19, 2019, at 9:32 AM, Wesley Krasko <wesbl...@gmail.com> wrote: > > Hello all, I was sent here from the Qt forum for more "technical" questions. > We have an app, it runs on Linux, Windows, and Mac OS. It is a video relay > app. The video is supplied via an SDK, I subclass one of their classes and > re-implement a lock and unlock function. On lock the SDK writes the current > frame/image into a buffer I supply (raw image data, I'm using a QImage at the > moment) then on unlock it says "ready" and I can draw it. This is happening > about 60fps. > So, at the moment I have 2 methods. One is a QGLWidget based class where I > use a QPainter in another thread to draw the QImage when ready. Its very > fast, no impact on GUI thread, on all platforms. However, there's a known bug > in Qt causing loss of style under Windows so I then had to do a backup D2D > method, non-threaded so it does not perform nearly as well. > Fast forward to today. We ran into all kinds of issues with Mac OS Catalina > and the beginning of their loss of support for OpenGL. We were able to > mitigate this for now by sticking with Mojave + Xcode 10 to build. > I would like to solve this once and for all hopefully. One threaded rendering > method I can use across all platforms. I know RHI is coming but it looks like > it's for Quick. I know that QGLWidget is deprecated and moving to > QOpenGLWidget might solve things but will it be future proof on Mac? Also, in > my attempts to move to this thus far, I can thread if I use open gl commands > directly but am no longer able to use QPainter in the thread. > Any suggestions on the best method going forward? I think I've read on > everything, QGraphicsView/Scene, RHI, etc and either the > documentation/examples are lacking or what I need to do doesn't seem doable > which I find odd, this seems like it would be a common use case to render > video frames! Thanks. > > -- > Wes Krasko > www.worldwidewes.com <http://www.worldwidewes.com/> > www.kraskofamily.com <http://www.kraskofamily.com/> > "Stay away from negative people. They have a problem for every solution." > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > https://lists.qt-project.org/listinfo/interest
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