Re: 16 bit subtraction with ABS function

Well... you don't necessarily need fancy fixed-point math. You could
hack it by doing 16-bit integer math and discard the low-byte when you
want the "whole" number. That way, your sine table can have values 0
throught 255 and you only have to use the high-byte for the "whole"
number bit. This is more or less how I implemented it in the raycaster
engine, except I used values 0-127 so I could do signed math more
easily. Of course, now that I think about it, I didn't have to do
that. :-) Ah well, it's a learning experience.

.

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