Mastering GUI Programming with Python

First steps with OpenGLWidget

There are two Qt classes that we can use to display OpenGL content: QtWidgets.QOpenGLWidget and QtGui.QOpenGLWindow. In practice, they behave almost exactly the same, but OpenGLWindow offers slightly better performance and may be a better choice if you don't want to use any other Qt widgets (that is, if your application is just full-screen OpenGL content). In our case, we're going to be combining our OpenGL drawing with other widgets, so we'll use QOpenGLWidget as the base for our class:

class GlWidget(qtw.QOpenGLWidget):    """A widget to display our OpenGL drawing"""

To create OpenGL content on our widget, we need to override two QOpenGLWidget methods:

• initializeGL(), which is run once to set up our OpenGL drawing ...