So far, we have learned how to draw a simple triangle in OpenGL. In this section, we will learn how to draw images and filter them with OpenGL.
We will do this work in a copy of the QtGL project, that is, a new project named GLFilter. The creation of the project simply involves straightforward copying and a little bit of renaming, just as we did in the previous chapters. I won't repeat it again here, so please copy it by yourself.
