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fixacos(3) Allegro manual fixacos(3) NAME fixacos - Fixed point inverse cosine lookup table. Allegro game programming library. SYNOPSIS #include <allegro.h> fixed fixacos(fixed x); DESCRIPTION This function finds the inverse cosine of a value using a lookup table. The input value must be a fixed point radian. The inverse cosine is defined only in the domain from `-1' to `1'. Outside of this input range, the func- tion will set `errno' to EDOM and return zero. Example: fixed result; /* Sets `result' to binary angle 128. */ result = fixacos(itofix(-1)); RETURN VALUE Returns the inverse sine of a fixed point value, measured as fixed point binary format angle, or zero if the input was out of range. All return val- ues of this function will be in the range `0' to `128'. SEE ALSO Allegro version 4.4.3 fixacos(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO
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