From 35a3de748a13038ef220a9a794f3e3c50d64c258 Mon Sep 17 00:00:00 2001
From: Rex Xu <rex.xu@amd.com>
Date: Wed, 14 Feb 2018 11:42:34 +0800
Subject: [PATCH] Fix an issue of interpolateAtVertexAMD().

An error message should be reported if the interpolant is not an input.
---
 glslang/MachineIndependent/ParseHelper.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/glslang/MachineIndependent/ParseHelper.cpp b/glslang/MachineIndependent/ParseHelper.cpp
index 69f47998..8016e2ea 100644
--- a/glslang/MachineIndependent/ParseHelper.cpp
+++ b/glslang/MachineIndependent/ParseHelper.cpp
@@ -1585,6 +1585,9 @@ void TParseContext::builtInOpCheck(const TSourceLoc& loc, const TFunction& fnCan
     case EOpInterpolateAtCentroid:
     case EOpInterpolateAtSample:
     case EOpInterpolateAtOffset:
+#ifdef AMD_EXTENSIONS
+    case EOpInterpolateAtVertex:
+#endif
         // Make sure the first argument is an interpolant, or an array element of an interpolant
         if (arg0->getType().getQualifier().storage != EvqVaryingIn) {
             // It might still be an array element.