Game Programming using Qt 5 Beginner's Guide - Second Edition

What just happened?

We have just set up a class chain that separates the window code from the actual OpenGL scene. The window forwards all calls related to scene contents to the scene object so that when the window is requested to repaint itself, it delegates the task to the scene object. Note that prior to doing that, the window will make the OpenGL context current; therefore, all OpenGL calls that the scene makes will be related to that context. You can store the code created in this exercise for later reuse in further exercises and your own projects.