• Originally reported in SDL3: external tablet driver bug with high precision mouse enabled ppy/osu#28223

SDL has special logic to convert raw absolute mouse (i.e. tablet) input to relative mouse motion. This tablet pen input never generates SDL_PenMotionEvents.

I would expect this pen to mouse logic to only fire when SDL_HINT_PEN_MOUSE_EVENTS is enabled. I would also expect to get the usual SDL_PenMotionEvent for this pen input.

This issue only affects tablet drivers that generate absolute mouse input. (Example: Wacom drivers with windows ink disabled, OpenTabletDriver, hawku Tablet Driver.) Tablet drivers that generate windows ink events work as expected via WM_POINTER & co. handling. When relative mouse mode is disabled, absolute tablet events are reported as absolute mouse input, which is not ideal, but is not really a problem as it's mapping absolute to absolute.