Problem rendering using OpenGL in VM

[xtal256]

Ok, i have been playing around this, seeing how things render using the Qt paintEvent() function as opposed to the paintGL() one. I am seeing even more inconsistencies than before.
Since i also want to render text on the OpenGL surface, i tried the following code:

void MapView::paintEvent(QPaintEvent*) {
    QPainter painter(this);
 
    painter.setBackground(Qt::black);
    painter.setPen(Qt::red);
    painter.drawLine(0, 0, 300, 300);
    painter.drawPixmap(10, 10, testImage);
 
    QFont font("Arial", 40);
 
    font.setStyleStrategy(QFont::ForceOutline);
    painter.setRenderHint(QPainter::Antialiasing);
    QPainterPath textPath;
 
    textPath.addText(20, QFontMetrics(font).height()+150, font, "Hello, World");
    painter.setPen(QPen(Qt::cyan, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
    QLinearGradient gradient(0, 0, 0, 100);
    gradient.setColorAt(0.0, QColor(255, 0, 0));
    gradient.setColorAt(1.0, QColor(0, 0, 255));
    painter.setBrush(gradient);
    painter.drawPath(textPath);
 
    painter.setPen(Qt::yellow);
    painter.drawText(150, 100, "Hello again");
}

void MapView::paintEvent(QPaintEvent*) {
    QPainter painter(this);

    painter.setBackground(Qt::black);
    painter.setPen(Qt::red);
    painter.drawLine(0, 0, 300, 300);
    painter.drawPixmap(10, 10, testImage);

    QFont font("Arial", 40);

    font.setStyleStrategy(QFont::ForceOutline);
    painter.setRenderHint(QPainter::Antialiasing);
    QPainterPath textPath;

    textPath.addText(20, QFontMetrics(font).height()+150, font, "Hello, World");
    painter.setPen(QPen(Qt::cyan, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
    QLinearGradient gradient(0, 0, 0, 100);
    gradient.setColorAt(0.0, QColor(255, 0, 0));
    gradient.setColorAt(1.0, QColor(0, 0, 255));
    painter.setBrush(gradient);
    painter.drawPath(textPath);

    painter.setPen(Qt::yellow);
    painter.drawText(150, 100, "Hello again");
}

To copy to clipboard, switch view to plain text mode 

On the VM, the gradient is not rendered (it's just a white rectangle), but the blue outline is. But, on my physical machine, it still does not render the gradient correctly. And the plain yellow text is not yellow and looks a bit squashed up.
I also tried turning on 3D acceleration in the VM and got different results still.

Here are some screenshots to explain better:
test.png

This is quite disappointing as i had hoped to use Qt's code for rendering text and images. It looks like i will just have to use 3rd party libraries or my own code, as i have been doing in the past. Sure would have been easier doing it all using Qt.

[xtal256]

I've ran into more complications.

I have a map editor for my game, and it has two OpenGL windows - one to display the map, and the other to display the tile set image (the map is composed of 2D "tiles").
The complication is that the OpenGL textures need to be loaded for each GL context. So i cannot just load all image resources up front, i need to do it in the initializeGL function of each window.
My old code did something similar, it would switch to the window's GL context before loading the images. But i was storing those images in the Map object, which is a bit misleading since they are so closely tied to the GL context in which they are being drawn, and not the object which "owns" them.

This just makes me wish i could use QPixmaps and QPainter even more. It would make life so much easier.

Does anyone know how i can get QPainter working with OpenGL?