OpenGL study Note 1

When I was a beginner in OpenGL, I put the example program with only one window in the book into a program framework with menu options.

Let's take a look:

The figure shows the interaction and operation of the entire program. Select the CG bar in the menu, for example:

In this figure, the CG option is used. Select A to display A person's face. Of course, there are only A few very simple coordinates. It is the data I have come up with, so it is not very beautiful;

When you get this picture, you can adjust the angle of view of this header by moving the mouse. The implementation principle is also very simple;