title: How to render text with QOpenGLWidget
body: <p>In older version of Qt there was <a href="http://qt-project.org/doc/qt-4.8/qglwidget.html" rel="noreferrer">QGLWidget</a>, with a nice function called <a href="http://qt-project.org/doc/qt-4.8/qglwidget.html#renderText" rel="noreferrer">renderText</a>. Now I'm using <a href="http://doc-snapshot.qt-project.org/qt5-5.4/qopenglwidget.html" rel="noreferrer">QOpenGLWidget</a> class and the functionality for rendering text is missing. </p>
  
  <p>Is there a easy way to render text using QOpenGLWidget? I won't like to build the whole text rendering with OpenGL from scratch... </p>