al_fixacos(3)al_fixacos(3)NAMEal_fixacos - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro.h>
al_fixed al_fixacos(al_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 function will set Allegro's errno to EDOM and return zero.
Example:
al_fixed result;
/* Sets result to binary angle 128. */
result = al_fixacos(al_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 values of this function will be in the range 0 to 128.
Allegro reference manualal_fixacos(3)
