From edc4aa0be4551b261ba606be99ed14b132e3b6c9 Mon Sep 17 00:00:00 2001
From: Olivia!! <hakurou46@gmail.com>
Date: Sun, 24 May 2026 05:31:19 +0200
Subject: [PATCH] Fixes linux credits crash (#1780)

alpha comparison mID is u16, but indexes into a 256-item table.
this causes MAT3 materials with an alpha comparison index of 0xFF crashes on linux

closes #1073
closes #1531
---
 libs/JSystem/include/JSystem/J3DGraphBase/J3DMatBlock.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libs/JSystem/include/JSystem/J3DGraphBase/J3DMatBlock.h b/libs/JSystem/include/JSystem/J3DGraphBase/J3DMatBlock.h
index a959609f45..859bd6943e 100644
--- a/libs/JSystem/include/JSystem/J3DGraphBase/J3DMatBlock.h
+++ b/libs/JSystem/include/JSystem/J3DGraphBase/J3DMatBlock.h
@@ -1575,6 +1575,12 @@ struct J3DAlphaComp {
     u8 getRef1() const { return mRef1; }
 
     void load() const {
+#ifdef AVOID_UB
+    if (mID > 255) {
+            J3DGDSetAlphaCompare(GX_ALWAYS, 0, GX_AOP_OR, GX_ALWAYS, 0);
+            return;
+        }
+#endif
         J3DGDSetAlphaCompare((GXCompare)getComp0(), mRef0, (GXAlphaOp)getOp(), (GXCompare)getComp1(), mRef1);
     }