Joystick button event structure (event.jbutton.*)
Defined in SDL_events.h
typedef struct SDL_JoyButtonEvent
{
Uint32 type; /**< SDL_JOYBUTTONDOWN or SDL_JOYBUTTONUP */
Uint32 timestamp; /**< In milliseconds, populated using SDL_GetTicks() */
SDL_JoystickID which; /**< The joystick instance id */
Uint8 button; /**< The joystick button index */
Uint8 state; /**< SDL_PRESSED or SDL_RELEASED */
Uint8 padding1;
Uint8 padding2;
} SDL_JoyButtonEvent;