clear_zbuffer(3alleg4)

💖 clear_zbuffer 💖

okay bestie, so this is a page from the Allegro manual — yes, the Allegro game programming library — and it's filed under 3alleg4 in case you were wondering where it lives. sit down, hydrate, and let's talk about Z-buffers 🦋

✨ NAME ✨

clear_zbuffer — writes a depth value into the given Z-buffer. Allegro game programming library. yes that's literally the whole job, and she does it flawlessly 💅

🌸 SYNOPSIS 🌸

#include <allegro.h>

void clear_zbuffer(ZBUFFER *zbuf, float z);

🎀 DESCRIPTION 🎀

so what she does is she writes z into the Z-buffer you hand her (zbuf), and heads up — 0 means far away. not close. far. i know, it's giving backwards-at-first-glance but it's the vibe and it's correct 🙈

the way that this is an init function is so real — you should be calling it to initialize the Z-buffer before every single frame. every frame, bestie. no skipping. it's like your skincare routine but for depth values ✨

okay now the part that's lowkey iconic: the low-level routines don't compare depth directly — they compare the depth of the current pixel with 1/z. so you're thinking in reciprocals, iykyk. which means if you wanna clip polygons farther than 10, you must call:

clear_zbuffer(zbuf, 0.1);

see? 1/10 = 0.1. math ate and left no crumbs 👑

💜 SEE ALSO 💜

• create_zbuffer(3alleg4)
• set_zbuffer(3alleg4)
• destroy_zbuffer(3alleg4)
• exzbuf(3alleg4)

the whole friend group fr fr, go say hi 🫶

Allegro, version 4.4.3, clear_zbuffer(3alleg4) — that's the source and the version and the date-ish stamp, so mwah, this page has been served 🌈💖 go clear some buffers, main character 💅