I came across a title recently, “The Black Art of Multiplatform Game Programming”, by Cengage Learning. Very easy to follow and its introduced by Andre Lamothe. He (Jazon Yamamoto) covers mostly SDL 1.2 but does have a chapter on migrating to SDL 2. Check out the website and download the example code and video files to get a grasp of what material is covered. Good luck on your engine!
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