Ruby/SDL is a Ruby extension library to use SDL library.

Ruby/SDL has following functions.

    Fast 2D graphics drawing.
    Input from keyboard, mouse, joystick.
    CD playback.
    Sound Playback with SDL_mixer
    TTF (TrueType Font) drawing with SDL_TTF
    Load image files, supporting BMP, PNM, XPM, LBM, PCX, GIF, JPEG, PNG,
     TGA formats with SDL_image
    mpeg playback with SMPGE
    Japanese string input with SDLSKK
    3D graphics drawing with OpenGL Interface
    bdf font drawing with SDL_kanji

WWW: https://ohai.github.io/rubysdl/