al_fixcos man page

al_fixcos — Allegro 5 API


#include <allegro5/allegro.h>

al_fixed al_fixcos(al_fixed x);


This function finds the cosine of a value using a lookup table. The input value must be a fixed point binary angle.


al_fixed angle;
float result;

/* Set the binary angle to 45 degrees. */
angle = al_itofix(32);

/* The cosine of 45 degrees is about 0.7071. */
result = al_fixtof(al_fixcos(angle));
assert(result > 0.7 && result < 0.71);

Return Value

Returns the cosine of a fixed point binary format angle as a fixed point value.