QPainter native painting

[Talei]

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:

void myWidget::paintEvent(QPaintEvent *e)
{
        QPainter p(this);
                 p.beginNativePainting();
 
                 glBegin(GL_QUADS);
                 glColor3ub(0,0,255);
                 glVertex2d(0, 0);
                 glVertex2d(0, height());
                 glColor3ub(255,0,0);
                 glVertex2d(width(), height());
                 glVertex2d(width(), 0);
                 glEnd();
 
                 qDebug() << "--- OpenGL paint" << this->width() << this->height() << p.paintEngine()->type();
 
        p.endNativePainting();
 
}

void myWidget::paintEvent(QPaintEvent *e)
{
        QPainter p(this);
                 p.beginNativePainting();

                 glBegin(GL_QUADS);
                 glColor3ub(0,0,255);
                 glVertex2d(0, 0);
                 glVertex2d(0, height());
                 glColor3ub(255,0,0);
                 glVertex2d(width(), height());
                 glVertex2d(width(), 0);
                 glEnd();

                 qDebug() << "--- OpenGL paint" << this->width() << this->height() << p.paintEngine()->type();

        p.endNativePainting();

}

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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.

[wysota]

Does myWidget inherit QGLWidget?

[Talei]

No.

I see (after sleep) where the problem lies.
QGLContext is non existing, in 4.7 I used setGraphicsSybstem opengl - qt created one for MainWindow automatically so I could do native in non OGL widget.

Sub classing QGLWidget solves problem.