| Value | Meaning |
|---|---|
| SDL_PEN_INPUT_DOWN(1u << 0) | Pen is pressed down |
| SDL_PEN_INPUT_BUTTON_1(1u << 1) | Button 1 is pressed |
| SDL_PEN_INPUT_BUTTON_2(1u << 2) | Button 2 is pressed |
| SDL_PEN_INPUT_BUTTON_3(1u << 3) | Button 3 is pressed |
| SDL_PEN_INPUT_BUTTON_4(1u << 4) | Button 4 is pressed |
| SDL_PEN_INPUT_BUTTON_5(1u << 5) | Button 5 is pressed |
| SDL_PEN_INPUT_ERASER_TIP(1u << 30) | Eraser tip is used |
Pen input flags, as reported by various pen events' pen_state field.