Get the number of active fingers for a given touch device.
Defined in SDL_touch.h
int SDL_GetNumTouchFingers(SDL_TouchID touchID);
SDL_TouchID | touchID | the ID of a touch device. |
(int) Returns the number of active fingers for a given touch device on success or 0 on failure; call SDL_GetError() for more information.
This function is available since SDL 2.0.0.