Thank you for the answer.
I didn't know that doubles work faster than floats. Coolbasic (programming language what for I'm doing this library) always uses floats, so I have to convert doubles to floats.
"CP_USE_DOUBLES 0" doesn't seem to work. I haven't changed that line. Warning has something to do with "CP_USE_DOUBLES 0" because it doesn't show up if I don't define it. But I think, I won't use floats...
Again one "BTW" question: Any idea how is made?