Add support for SPV_NV_sample_mask_override_coverage

glslang/MachineIndependent/localintermediate.h

@@ -151,6 +151,9 @@ public:
         shiftUboBinding(0),
         autoMapBindings(false),
         flattenUniformArrays(false),
+#ifdef NV_EXTENSIONS 
+        layoutOverrideCoverage(false),
+#endif
         useUnknownFormat(false)
     {
         localSize[0] = 1;
@@ -387,6 +390,11 @@ public:
     static int getBaseAlignment(const TType&, int& size, int& stride, bool std140, bool rowMajor);
     bool promote(TIntermOperator*);
 
+#ifdef NV_EXTENSIONS 
+    void setLayoutOverrideCoverage() { layoutOverrideCoverage = true; }
+    bool getLayoutOverrideCoverage() const { return layoutOverrideCoverage; }
+#endif
+
 protected:
     TIntermSymbol* addSymbol(int Id, const TString&, const TType&, const TConstUnionArray&, TIntermTyped* subtree, const TSourceLoc&);
     void error(TInfoSink& infoSink, const char*);
@@ -447,6 +455,10 @@ protected:
     bool xfbMode;
     bool multiStream;
 
+#ifdef NV_EXTENSIONS 
+    bool layoutOverrideCoverage;
+#endif
+
     typedef std::list<TCall> TGraph;
     TGraph callGraph;