From 6d5ef9b650a9db35f7774ca09d9225d0c30849e4 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Tue, 11 Jun 2024 00:01:12 -0700
Subject: Fix `GetAttributeAtVertex` for spirv and glsl targets. (#4334)

---
 source/slang/slang-emit-glsl.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'source/slang/slang-emit-glsl.cpp')

diff --git a/source/slang/slang-emit-glsl.cpp b/source/slang/slang-emit-glsl.cpp
index d13bc96d1..936dc15ff 100644
--- a/source/slang/slang-emit-glsl.cpp
+++ b/source/slang/slang-emit-glsl.cpp
@@ -2755,6 +2755,11 @@ void GLSLSourceEmitter::emitVarDecorationsImpl(IRInst* varDecl)
         {
             prefix = toSlice("hitAttribute");
         }
+        else if (as<IRPerVertexDecoration>(decoration))
+        {
+            _requireGLSLExtension(toSlice("GL_EXT_fragment_shader_barycentric"));
+            prefix = toSlice("pervertex");
+        }
         else
         {
             IRIntegerValue locationValue = -1;
-- 
cgit v1.2.3