From cc780927e6ca5ddefc7b03bafab171d67089b2c3 Mon Sep 17 00:00:00 2001
From: Hunter Kvalevog <hunter@kvog.sh>
Date: Mon, 28 Sep 2026 20:50:17 -0500
Subject: rust-asm: rust -> assembly interop demo

---
 rust-asm/src/main.rs | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 rust-asm/src/main.rs

(limited to 'rust-asm/src/main.rs')

diff --git a/rust-asm/src/main.rs b/rust-asm/src/main.rs
new file mode 100644
index 0000000..33adc16
--- /dev/null
+++ b/rust-asm/src/main.rs
@@ -0,0 +1,46 @@
+// ================================================================================================
+// 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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