From f1221b80c3c5f59ed533147825ea414bef5e9df2 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Tue, 30 Apr 2024 09:57:54 -0700
Subject: Metal: Vertex/Fragment builtin and layouts. (#4044)

* Metal: Vertex/Fragment builtin and layouts.

* Fix.

* Fix test.

* Emit user semantic on vertex/fragment attributes.
---
 source/slang/slang.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'source/slang/slang.cpp')

diff --git a/source/slang/slang.cpp b/source/slang/slang.cpp
index 971d6056f..4a446a351 100644
--- a/source/slang/slang.cpp
+++ b/source/slang/slang.cpp
@@ -6445,6 +6445,9 @@ SlangResult EndToEndCompileRequest::isParameterLocationUsed(Int entryPointIndex,
     if (SLANG_FAILED(_getEntryPointResult(this, static_cast<int>(entryPointIndex), static_cast<int>(targetIndex), artifact)))
         return SLANG_E_INVALID_ARG;
 
+    if (!artifact)
+        return SLANG_E_NOT_AVAILABLE;
+
     // Find a rep
     auto metadata = findAssociatedRepresentation<IArtifactPostEmitMetadata>(artifact);
     if (!metadata)
-- 
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