Here is a list of all macros with links to the files they belong to:

### - u -

- SDL_UINT64_C : SDL_stdinc.h
- SDL_UnionFRect : SDL_oldnames.h
- SDL_UnionRect : SDL_oldnames.h
- SDL_Unsupported : SDL_error.h
- SDL_UNUSED : SDL_begin_code.h
- SDL_UpperBlit : SDL_oldnames.h
- SDL_UpperBlitScaled : SDL_oldnames.h
- SDL_US_PER_SECOND : SDL_timer.h
- SDL_US_TO_NS : SDL_timer.h
- SDL_USEREVENT : SDL_oldnames.h