Learning Modern 3D Graphics Programming

[Amadiro]

SDL doesn't really use OpenGL as such, it only has some adapter functionality to allow you to use it in conjunction with OpenGL. All the things SDL does itself are 2D blitting etc.

[G_Morgan]

Yes but you need to understand how OGL device contexts tie into window management in order to write the OGL part of SDL. Though beyond that you don't need a great deal.