The hint to watch.
An SDL_HintCallback function that will be called when the hint value changes.
A pointer to pass to the callback function.
true on success or false on failure; call SDL_GetError() for more information.
Threadsafety: It is safe to call this function from any thread.
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Add a function to watch a particular hint.
The callback function is called _during_ this function, to provide it an initial value, and again each time the hint's value changes.