Hello,
I have problem with QPainter and native painting.
In short it doesn't work.

For example I use in paintEvent() this code to draw simple quad:

Qt Code: 
  1. void myWidget::paintEvent(QPaintEvent *e)
  2. {
  3.         QPainter p(this);
  4.                  p.beginNativePainting();
  5.  
  6.                  glBegin(GL_QUADS);
  7.                  glColor3ub(0,0,255);
  8.                  glVertex2d(0, 0);
  9.                  glVertex2d(0, height());
  10.                  glColor3ub(255,0,0);
  11.                  glVertex2d(width(), height());
  12.                  glVertex2d(width(), 0);
  13.                  glEnd();
  14.  
  15.                  qDebug() << "--- OpenGL paint" << this->width() << this->height() << p.paintEngine()->type();
  16.  
  17.         p.endNativePainting();
  18.  
  19. }
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paintEngine()->type() is always 10 == Rester.

So the question:
how to initialize OpenGL painting with the QPainter? (qt 4.8.1)

I don't know if it's lack of the sleep but with the 4.7. this worked fine.