Tearing occurring in my openGL window when using QOpenGLWidget
I have been working on this problem pretty much all day. I have set up a QOpenGLWidget that serves as a simple openGL viewport to render to. Even if I don't draw content, about 50% of the time when I run the app, the screen will flicker like this:
!http://i.imgur.com/YhNDr0V.png(OpenGL viewport tearing)!
Other times, it comes up fine. Has anyone ever seen this?
At first I thought it was my content drawing. So I turned off drawing everything and it still does it about 50% of the time. I'm setting up the QOpenGLWidget like this:
format.setProfile( QSurfaceFormat::CoreProfile );
This is running on a mac.
could be graphics driver bug if it doesn't repro on other machines.
The heart of this problem turned out to be QOpenGLWidget. When I switched back to QGLWidget, the problem went away. I pretty certain QOpenGLWidget isn't 100% bug free.
The trouble I have been having is more related to compiling my application to run on Mac and IOS--which use different shaders. The OpenGL surface has to be configured different to accommodate whichever platform is compiling. It doesn't appear that the QOpenGLWidget is compatible with IOS yet
in that case, could you please file a Qt bug? http://bugreports.qt-project.org/
thank you so much!