Add support for SPV_NV_geometry_shader_passthrough

glslang/Include/Types.h

@@ -599,6 +599,9 @@ public:
         layoutFormat = ElfNone;
 
         layoutPushConstant = false;
+#ifdef NV_EXTENSIONS
+        layoutPassthrough = false;
+#endif
     }
     bool hasLayout() const
     {
@@ -652,6 +655,10 @@ public:
 
     bool layoutPushConstant;
 
+#ifdef NV_EXTENSIONS
+    bool layoutPassthrough;
+#endif
+
     bool hasUniformLayout() const
     {
         return hasMatrix() ||
@@ -1537,6 +1544,12 @@ public:
                 if (qualifier.layoutPushConstant)
                     p += snprintf(p, end - p, "push_constant ");
 
+#ifdef NV_EXTENSIONS
+                if (qualifier.layoutPassthrough)
+                    p += snprintf(p, end - p, "passthrough ");
+#endif
+
+
                 p += snprintf(p, end - p, ") ");
             }
         }