Provided by: libsdl3-doc_3.2.10+ds-1_all 

NAME
SDL_PEN_TOUCHID - The SDL_TouchID for touch events simulated with pen input.
HEADER FILE
Defined in SDL3/SDL_pen.h
SYNOPSIS
#include "SDL3/SDL.h" #define SDL_PEN_TOUCHID ((SDL_TouchID)-2)
AVAILABILITY
This macro is available since SDL 3.2.0. Simple Directmedia Layer SDL 3.2.10 SDL_PEN_TOUCHID(3)