QtQuick App with underlying EGL returns a 0x300d (EGL_BAD_SURFACE) when swapping buffers

[Bodo]

Hi all,

I'm just trying to exchange an EGL stream from a producer to a consumer.
The basic streaming is running so far, but as soon as the buffers are swapped, I get a 0x300d thrown.

According to the docs this is caused by:

EGL_BAD_SURFACE is generated if surface is not an EGL drawing surface.

My EGL is initialized with:

m_display = (EGLDisplay*)eglGetDisplay(EGL_DEFAULT_DISPLAY);

// snip find m_config via eglGetConfigAttrib until a suitable is found

Display* xDisp = QX11Info::display();
m_window = DefaultRootWindow(xDisp);
m_surface = eglCreateWindowSurface(m_display, m_config, m_window, NULL);

I'm re-setting the context upfront aquiring the frame and even re-bind the textures and stuff.
But I can't get rid of this problem. The whole setup and streaming process is not complaining about a surface problem, until I start swapping.

While crawling for this problem I came upon Qt Platform Abstraction and EGLFS.
Has anyone experience here if this would be the way to go?

The big problem I'm reading in EGLFS is:

As of Qt 5.3, eglfs supports a single fullscreen GL window: such as an OpenGL-based QWindow, a QQuickView, or a QOpenGLWidget.

This would be a show stopper as I'd like to handle and display multiple EGL streams in different QuickViews. Definitively not fullscreen.

Any hints or tips in this issue are highly appreciated,

Thanks + Best,
Bodo

[Bodo]

Ok, got this solved meanwhile. This was a thread/contexting problem.