Create the HLSL shadow texture function.

TRAC #23394
Signed-off-by: Jamie Madill
Signed-off-by: Shannon Woods
Author: Nicolas Capens
diff --git a/src/compiler/OutputHLSL.h b/src/compiler/OutputHLSL.h
index 2a3736c..73409e8 100644
--- a/src/compiler/OutputHLSL.h
+++ b/src/compiler/OutputHLSL.h
@@ -39,6 +39,7 @@
 
     TString typeString(const TType &type);
     TString textureString(const TType &type);
+    TString samplerString(const TType &type);
     TString interpolationString(TQualifier qualifier);
     TString structureString(const TStructure &structure, bool useHLSLRowMajorPacking, bool useStd140Packing);
     TString structureTypeName(const TStructure &structure, bool useHLSLRowMajorPacking, bool useStd140Packing);