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// ================================================================================================
// Rust->assembly interop demo
//
// License:
// SPDX-License-Identifier: 0BSD
// Copyright (c) 2026 Hunter Kvalevog
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE.
// ================================================================================================
#[repr(C)]
struct Vec3 {
x: f32,
y: f32,
z: f32,
}
impl Vec3 {
pub fn new(x: f32, y: f32, z: f32) -> Self {
Self { x, y, z }
}
}
unsafe extern "C" {
fn add_u32(a: u32, b: u32) -> u32;
fn dot_f32v3(a: *const Vec3, b: *const Vec3) -> f32;
}
fn test_add(a: u32, b: u32) {
let r = unsafe { add_u32(a, b) };
println!("{a} + {b} = {r}");
}
fn test_dot(a: &Vec3, b: &Vec3) {
let r = unsafe { dot_f32v3(a, b) };
println!("[{}, {}, {}] ⋅ [{}, {}, {}] = {}", a.x, a.y, a.z, b.x, b.y, b.z, r);
}
fn main() {
test_add(1, 2);
test_dot(&Vec3::new(1.0, 2.0, 3.0), &Vec3::new(4.0, 5.0, 6.0));
}
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