Add way to check for existing capabilities

renderdoc/driver/shaders/spirv/spirv_editor.cpp

@@ -233,7 +233,7 @@ void Editor::AddDecoration(const Operation &op)
 void Editor::AddCapability(Capability cap)
 {
   // don't add duplicate capabilities
-  if(capabilities.find(cap) != capabilities.end())
+  if(HasCapability(cap))
     return;
 
   // insert the operation at the very start
@@ -243,6 +243,11 @@ void Editor::AddCapability(Capability cap)
   addWords(FirstRealWord, op.size());
 }
 
+bool Editor::HasCapability(Capability cap)
+{
+  return capabilities.find(cap) != capabilities.end();
+}
+
 void Editor::AddExtension(const rdcstr &extension)
 {
   // don't add duplicate extensions

renderdoc/driver/shaders/spirv/spirv_editor.h

@@ -97,6 +97,7 @@ public:
   void SetMemberName(Id id, uint32_t member, const rdcstr &name);
   void AddDecoration(const Operation &op);
   void AddCapability(Capability cap);
+  bool HasCapability(Capability cap);
   void AddExtension(const rdcstr &extension);
   void AddExecutionMode(const Operation &mode);
   Id HasExtInst(const char *setname);