al_transpose_transform(3)

al_transpose_transform(3) ✨

okay so this page is from the Library Functions Manual — it’s the Allegro 5 API manual, and we’re talking about al_transpose_transform(3), bestie. 🫶

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👑 NAME 👑

al_transpose_transform - Allegro 5 API

✨ SYNOPSIS ✨

#include <allegro5/allegro.h>

void al_transpose_transform(ALLEGRO_TRANSFORM *trans)

🦋 DESCRIPTION 🦋

This function transposes the matrix of the transform you pass in as trans. 🌈

You can use it for inversing a rotation transform — no cap, that’s the whole use case. For example: 💅

al_build_camera_transform(camera, 0, 0, 0, x, y, z, xu, yu, zu)
al_copy_transform(inverse, camera)
al_transpose_transform(camera)
// Now "inverse" will be a transformation rotating in the opposite
// direction from "camera". Note that this only works if the camera
// position is 0/0/0 as in the example.

And yes, the caveat is right there in the comment: this only works if the camera position is 0/0/0 as in the example. Don’t skip it, bestie. 😭

🎀 SINCE 🎀

5.2.5 — she’s been here since then, periodt. ⭐

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cute footer sign-off: source/version: Allegro reference manual — date: not printed on this page, so no date to spill; the footer just gives the manual and al_transpose_transform(3). 💖