I think there's some confusion in the OpenGL example renderers. OpenGL 2.0 is where the programmable pipeline was added. The GL 3.2 renderer actually only requires GL 2.0, if you change the shader to version 1.10 (and thus, to use attribute, varying and gl_FragColor), and the GL 2 renderer doesn't use any GL 2 features. The way it is, the 3.2 requirement is completely unnecessary.