fixsin(3)

📦 version 4.4.3.1, in fedora 43, fedora 44

okay bestie, welcome to fixsin(3) from the Allegro manual 💖 this is the fixed-point sine function and it's lowkey iconic for game programming. no cap. let's get into it ✨

✨ NAME ✨

fixsin — fixed point sine of binary angles. Allegro game programming library. periodt.

🌸 SYNOPSIS 🌸

#include <allegro.h>

fixed fixsin(fixed x);

🦋 DESCRIPTION 🦋

so this function finds the sine of a value using a lookup table. the way that it works? you gotta feed it a fixed point binary angle — that's the vibe. it's not out here doing real math on the fly, it's looking things up like a queen with a cheat sheet 💅. the input value must be a fixed point binary angle, okay? no exceptions, bestie.

example time, periodt:

fixed angle;
int result;

/* Set the binary angle to 90 degrees. */
angle = itofix(64);
/* The sine of 90 degrees is one. */
result = fixtoi(fixsin(angle));
ASSERT(result == 1);

not me showing you the exact code so you can copy-paste and slay 🫶

💜 RETURN VALUE 💜

returns the sine of a fixed point binary format angle. the return value will be in radians. (yes bestie, radians, not degrees, don't come for me 😭 it's giving math class flashbacks but we move.)

🎀 SEE ALSO 🎀

also the original list had a lil leading comma before the first one, so if you need the exact string it's: , ex12bit(3), ex3buf(3), exblend(3), excustom(3), exspline(3), exupdate(3) — we love a typo moment, it's giving unhinged but we keep it fr fr.

and that's the whole page! no cap. this was fixsin(3) from the Allegro manual, version 4.4.3, and there's no date on the footer so we're just gonna say: stay slay, keep your angles fixed, and may your lookup tables always hit 💖✨🦋👑

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