From d6cf708a4fd1caf0f2e193ceb7c23fa8e77cc1db Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Thu, 18 Jun 2026 23:33:07 +0200
Subject: feat(engine): add discriminant size to enum reflection

---
 engine-macros/src/reflection/enum_impl.rs | 11 +++++++++++
 engine-reflection/src/lib.rs              |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/engine-macros/src/reflection/enum_impl.rs b/engine-macros/src/reflection/enum_impl.rs
index 0ce2562..9d53d8e 100644
--- a/engine-macros/src/reflection/enum_impl.rs
+++ b/engine-macros/src/reflection/enum_impl.rs
@@ -139,6 +139,16 @@ fn generate_impls(
 
     let input_ident = &input.ident;
 
+    let discriminant_size = if is_unit_only {
+        quote! {
+            std::mem::size_of::<Self>()
+        }
+    } else {
+        quote! {
+            std::mem::size_of::<#mod_name::Discriminant>()
+        }
+    };
+
     quote! {
         unsafe impl #engine_crate_path::reflection::Reflection for
             #input_ident #generic_args
@@ -151,6 +161,7 @@ fn generate_impls(
                         #engine_crate_path::reflection::Enum {
                             variants: &[#(#variants),*],
                             is_unit_only: #is_unit_only,
+                            discriminant_size: #discriminant_size,
                             tagged_union: #tagged_union,
                             get_default_value: || {
                                 #get_default_value_fn
diff --git a/engine-reflection/src/lib.rs b/engine-reflection/src/lib.rs
index b48ecfe..289989c 100644
--- a/engine-reflection/src/lib.rs
+++ b/engine-reflection/src/lib.rs
@@ -120,6 +120,8 @@ pub struct Enum
     /// The enum only contains unit variants.
     pub is_unit_only: bool,
 
+    pub discriminant_size: usize,
+
     pub tagged_union: Option<EnumTaggedUnion>,
 
     pub get_default_value: fn() -> Option<DefaultValueFn>,
-- 
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