From 40a1ba0431a7d3755d2d428ff8b3c927c4f4b208 Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Fri, 8 Sep 2023 14:53:18 -0700
Subject: [PATCH] math: use extern struct for guaranteed memory layout

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 src/math/mat.zig  | 2 +-
 src/math/quat.zig | 2 +-
 src/math/vec.zig  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/math/mat.zig b/src/math/mat.zig
index 9d5a73fb..bec09443 100644
--- a/src/math/mat.zig
+++ b/src/math/mat.zig
@@ -10,7 +10,7 @@ pub fn Mat(
     comptime n_rows: usize,
     comptime Vector: type,
 ) type {
-    return struct {
+    return extern struct {
         v: [cols]Vec,
 
         /// The number of columns, e.g. Mat3x4.cols == 3
diff --git a/src/math/quat.zig b/src/math/quat.zig
index 3986576f..c5c09648 100644
--- a/src/math/quat.zig
+++ b/src/math/quat.zig
@@ -6,7 +6,7 @@ const math = mach.math;
 const vec = @import("vec.zig");
 
 pub fn Quat(comptime Scalar: type) type {
-    return struct {
+    return extern struct {
         v: vec.Vec(4, Scalar),
 
         /// The scalar type of this matrix, e.g. Mat3x3.T == f32
diff --git a/src/math/vec.zig b/src/math/vec.zig
index bc6959e1..8114fa18 100644
--- a/src/math/vec.zig
+++ b/src/math/vec.zig
@@ -5,7 +5,7 @@ const testing = mach.testing;
 const math = mach.math;
 
 pub fn Vec(comptime n_value: usize, comptime Scalar: type) type {
-    return struct {
+    return extern struct {
         v: Vector,
 
         /// The vector dimension size, e.g. Vec3.n == 3