SDL_JoystickGetButton  -  Get  the current state of a given button on a
       given joystick
       #include "SDL.h"
       Uint8 SDL_JoystickGetButton(SDL_Joystick *joystick, int button);
       SDL_JoystickGetButton returns the current state of the given button  on
       the given joystick.
       1 if the button is pressed. Otherwise, 0.
       SDL_JoystickNumButtons