fixsin(3alleg4)

💖 fixsin — the sine girlie of Allegro 💖

okay bestie, you found her: fixsin, living in the 3alleg4 manual, aka the Allegro game programming library. she does trig. she does it fast. she does it in fixed point. slay. ✨

🌸 SYNOPSIS 🌸

#include <allegro.h>

fixed fixsin(fixed x);

like. that's it. that's the whole vibe. one argument, one return, no drama. 🎀

🦋 DESCRIPTION 🦋

so fixsin finds the sine of a value, and it does it using a lookup table — no cap, it's just out here consulting her little table instead of doing the whole slow math thing. main character behaviour fr fr.

the input value must be a fixed point binary angle. that part is not optional, bestie, that's the rule. 💅

here's the example, exactly as written, because we do not paraphrase code in this house:

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);

the way that itofix(64) is a whole 90 degrees and fixsin of it is literally one… obsessed. 🔥

⭐ RETURN VALUE ⭐

she returns the sine of a fixed point binary format angle. and heads up — the return value will be in radians. yes, radians, not the binary-angle situation you fed her. it's giving ✨ conversion ✨. iykyk. 💜

🌈 SEE ALSO 🌈

go read these too, they're all iconic:

• ex12bit(3alleg4)
• ex3buf(3alleg4)
• exblend(3alleg4)
• excustom(3alleg4)
• exspline(3alleg4)
• exupdate(3alleg4)

🫶 tiny lore drop: the original list opens with a stray leading comma, like a ghost entry nobody invited. here it is, preserved for the culture: text , ex12bit(3alleg4), ex3buf(3alleg4), exblend(3alleg4), excustom(3alleg4), exspline(3alleg4), exupdate(3alleg4) anyway. periodt. 💅

and that's the page, bestie 🍓 — brought to you by Allegro, version 4.4.3, in the 3alleg4 manual. go forth and sine responsibly. 💖✨🎀🦋🌸👑