OpenGL hadware overlay

问题

How to make a hardware overlay in Qt 5.1?

This is what I have so far:

QGLFormat fmt;
fmt.setSamples(16);
fmt.setOverlay(true);

MainWidget w(fmt);
w.show();

////////////////////////////////////////////////////////////////////////////////

MainWidget::MainWidget(const QGLFormat &format, QWidget *parent)
: QGLWidget(format, parent)
{
    qDebug() << format().hasOverlay() ?
            "Hardware overlay is supported" : "No hardware overlay support";
    qDebug() << "OpenGL " +
        QString::number(this->format().majorVersion()) + "." +
        QString::number(this->format().minorVersion());
}

But it always returns false :(
OpenGL version is 4.3
Video card is GeForce GT 650M

回答1:

Hardware Overlays are not a standard feature. No consumer grade GPU supports them (well, their hardware could, but the drivers don't). You need a Quadro or a FireGL GPU for hardware overlays to become available.

来源：https://stackoverflow.com/questions/18200763/opengl-hadware-overlay