SDL_HintCallback.3type - Man Page

#include <SDL3/SDL_hints.h>

typedef void(SDLCALL *SDL_HintCallback)(void *userdata, const char *name, const char *oldValue, const char *newValue);

This is called an initial time during SDL_AddHintCallback with the hint's current value, and then again each time the hint's value changes.

userdata

what was passed as userdata to SDL_AddHintCallback().

name

what was passed as name to SDL_AddHintCallback().

oldValue

the previous hint value.

newValue

the new value hint is to be set to.

This callback is fired from whatever thread is setting a new hint value. SDL holds a lock on the hint subsystem when calling this callback.

This datatype is available since SDL 3.2.0.

SDL_AddHintCallback(3)