Hi , guys . I have been using SDL for quite a while and thanks to all the contributers of it.
For a long time I was seeking a good solution of skeleton-animation supported tool/platform which works well with SDL.Unfortunately ,I couldn’t find one. So ,Inspiring from spine-sfml official runtime and for my own mobile developing,I developed a spine-runtime called ‘spine-sdl’ for SDL2. Check the github address below:

I simply test and use it in iOS. and all the spine features are supported.If you have time, it’s a good thing to extend it for other opengl platforms: such as opengl, opengles 2 , 3.

Feel free to ask any question about it.