c++ - QGLWidget maximum size -

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i have qt application using opengl drawing qglwidget, on mac os. on mbp works well, when trying on 30" screen, noticed there window size limit.
if increase window size beyond limit, qglwidget's content disappears , greyish memory junk visible.

i changed code put qglwidget on screen. repaint event setting background black in each iteration.
issue still visible: when resizing widget, black surface disappears , gets replaced memory junk, when size of widget reaches size.

interesting facts:

  • when decrease window size, gl surface comes live again
  • i have several other gl applications (not qt) running in maximized window, issue not opengl driver/video card
  • it seems area of window (nr of pixels) matters, if make window wide, it's height limited , vica versa, if windoe maximized in height, width must small

i found while instantiating qglwidget using qglformat(qgl::nosamplebuffers) instead of qglformat(qgl::samplebuffers) solves issue.


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