Add query for whether extended instruction set exists

renderdoc/driver/shaders/spirv/spirv_editor.cpp

@@ -280,6 +280,17 @@ void Editor::AddExecutionMode(const Operation &mode)
   addWords(offset, mode.size());
 }
 
+Id Editor::HasExtInst(const char *setname)
+{
+  for(auto it = extSets.begin(); it != extSets.end(); ++it)
+  {
+    if(it->second == setname)
+      return it->first;
+  }
+
+  return Id();
+}
+
 Id Editor::ImportExtInst(const char *setname)
 {
   for(auto it = extSets.begin(); it != extSets.end(); ++it)

renderdoc/driver/shaders/spirv/spirv_editor.h

@@ -99,6 +99,7 @@ public:
   void AddCapability(Capability cap);
   void AddExtension(const rdcstr &extension);
   void AddExecutionMode(const Operation &mode);
+  Id HasExtInst(const char *setname);
   Id ImportExtInst(const char *setname);
   Id AddType(const Operation &op);
   Id AddVariable(const Operation &op);