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void renderText( QGLWidget* w, int x, int y, const QString& text, const QColor& col = Qt::white, const QFont& font = QFont() )
{
    glMatrixMode( GL_PROJECTION );
    glPushMatrix();              
    glLoadIdentity();              
    glOrtho( 0, w->width(), w->height(), 0, 0, 1 );
    glMatrixMode( GL_MODELVIEW );
    glPushMatrix();              
    glLoadIdentity();              

	QFontMetrics fm(font);
	QRect rect = fm.boundingRect( text);

	QPixmap pixmap( rect.size() );
	pixmap.fill( Qt::black );
	QPainter painter(&pixmap);
	painter.setPen( Qt::white );
	painter.setFont( font );
	painter.drawText( -rect.left(), -rect.top(), text );

	QImage img = pixmap.convertToImage();
	img.setAlphaBuffer( true );
	for ( int i = 0; i < img.height(); i++ ) {
		QRgb* rgb = (QRgb*) img.scanLine(i);
		for ( int j = 0; j < img.width(); j++ ) {
			rgb[j] = qRgba( col.red(), col.green(), col.blue(), qRed(rgb[j]) );
		}   
	}
	img = QGLWidget::convertToGLFormat(img);

	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glRasterPos2i( x, y );
	glDrawPixels( rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, img.bits() );
	glDisable(GL_BLEND);
	glMatrixMode( GL_PROJECTION );
    glPopMatrix();              
    glMatrixMode( GL_MODELVIEW );
    glPopMatrix();              
}