參考資訊：
https://www.libsdl.org/release/SDL-1.2.15/include/SDL_keysym.h
| 按鍵 | SDL Key | Key Value |
|---|---|---|
| UP | SDL_UP | 273 |
| DOWN | SDL_DOWN | 274 |
| LEFT | SDL_LEFT | 276 |
| RIGHT | SDL_RIGHT | 275 |
| A | SDL_SPACE | 32 |
| B | SDL_LCTRL | 306 |
| X | SDL_LSHIFT | 304 |
| Y | SDL_LALT | 308 |
| R | SDL_BACKSPACE | 8 |
| L | SDL_TAB | 9 |
| SELECT | SDL_RCTRL | 305 |
| MENU | SDL_ESCAPE | 27 |
| START | SDL_RETURN | 13 |