Man page - sdl_pen_mouseid(3)

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Manual

SDL_PEN_MOUSEID(3) SDL3 FUNCTIONS SDL_PEN_MOUSEID(3)

SDL_PEN_MOUSEID - The SDL_MouseID
for mouse events simulated with pen input.

Defined in SDL3/SDL_pen.h

#include "SDL3/SDL.h"
#define SDL_PEN_MOUSEID ((SDL_MouseID)-2)

This macro is available since SDL 3.2.0.

SDL 3.2.10 Simple Directmedia Layer