fixcos(3alleg4)

🌸 fixcos — bestie edition 💅

okay so this is fixcos(3alleg4), from the Allegro manual, and it lives in the Allegro game programming library. it's literally a cosine function but make it fixed point. let's go 🦋

✨ NAME ✨

fixcos — fixed point cosine of binary angles. Allegro game programming library. periodt 💖

✨ SYNOPSIS ✨

#include <allegro.h>

fixed fixcos(fixed x);

like yes that's the whole thing, she's compact 👑

✨ DESCRIPTION ✨

so fixcos finds the cosine of a value, and the way it does that is with a lookup table</c> — not me being efficient, i just am 💅. the one thing you MUST remember: the input value has to be a fixed point binary angle. that's non-negotiable bestie, no cap.

example time, look at this:

fixed angle;
float result;

/* Set the binary angle to 45 degrees. */
angle = itofix(32);
/* The cosine of 45 degrees is about 0.7071. */
result = fixtof(fixcos(angle));
ASSERT(result > 0.7 && result < 0.71);

see how itofix(32) is the binary angle for 45 degrees? and then fixtof converts the fixed result back into a float so we can actually vibe with it? and the ASSERT is just checking it lands between 0.7 and 0.71 because cos(45°) ≈ 0.7071. slay 🔥

✨ RETURN VALUE ✨

it returns the cosine of a fixed point binary format angle. and the return value will be in radians. yep. that's what the docs say. i don't make the rules 💀

✨ SEE ALSO ✨

• (the first entry here is literally blank in the original — empty slot, ghost link, iconic glitch 🙈)
• ex12bit(3alleg4)
• ex3buf(3alleg4)
• exblend(3alleg4)
• excustom(3alleg4)
• exspline(3alleg4)
• exupdate(3alleg4)

and that's the whole page bestie, no crumbs left 🍓 Allegro, version 4.4.3 — this one's fixcos(3alleg4), mwah 💖🎀✨