Rendering a QImage on openGL

[maitai_vw]

Hello,
I am trying to render a QImage on an openGL surface. I have read/studied many tutorials but no luck so far. If someone could point me where my mistake is...

    QOpenGLContext context;
    context.create();
    QOffscreenSurface surface;
    surface.setFormat(QSurfaceFormat::defaultFormat());
    surface.create();
    context.makeCurrent(&surface);
    QOpenGLFramebufferObjectFormat fboFormat;
    fboFormat.setSamples(16);
    fboFormat.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
    const int w = 800;
    const int h = 600;
    QOpenGLFramebufferObject fbo(w, h, fboFormat);
    fbo.bind();
    QOpenGLPaintDevice device(QSize(w, h));
    QPainter pnt(&device);
    pnt.setRenderHint(QPainter::Antialiasing);
    pnt.setRenderHint(QPainter::TextAntialiasing);
    pnt.setRenderHint(QPainter::SmoothPixmapTransform);
    pnt.fillRect(QRect(0, 0, w, h), Qt::green);
    pnt.end();
    QImage pix(50, 100, QImage::Format_ARGB32_Premultiplied);
    pix.fill(Qt::red);
    glEnable(GL_TEXTURE_2D);
    QOpenGLTexture *texture = new QOpenGLTexture(pix.mirrored(), QOpenGLTexture::DontGenerateMipMaps);
    texture->bind();
    glEnable(GL_DEPTH_TEST);
    glPushMatrix();
    glTranslatef(10, 10, 0);
    glBegin(GL_QUADS);
    glTexCoord2i(0, 0); glVertex3f(0, 0, 0);
    glTexCoord2i(1, 0); glVertex3f(pix.width(), 0, 0);
    glTexCoord2i(1, 1); glVertex3f(pix.width(), pix.height(), 0);
    glTexCoord2i(0, 1); glVertex3f(0, pix.height(), 0);
    glEnd();
    glPopMatrix();
    glFlush();
    texture->release();
    glDisable(GL_TEXTURE_2D);
    delete texture;
    fbo.release();
    fbo.toImage().save("opengl.png");

All I get is a plain green image... I have tried many other things and options, this version seems to me the more logical, yet it does not work.

Thanks in advance for unlocking me...