void AddBuiltinKeyword(GenericMenu gm, ShaderKeyword keyword)
{
if (m_Graph.keywords.Where(x => x.referenceName == keyword.referenceName).Any())
{
gm.AddDisabledItem(new GUIContent($"Keyword/{keyword.displayName}"));
}
else
{
gm.AddItem(new GUIContent($"Keyword/{keyword.displayName}"), false, () => AddInputRow(keyword.Copy(), true));
}
}
