Dirigisme is basically what social democratic nations have, right?
Not necessarily - classic dirigisme as practiced by France was essentially capitalism with a strong government participation in economic life (through both Keynesian means and through direct ownership of some companies, which in France were largely oriented around infrastructure and the defence industry). Whilst there probably have been social-democratic elements added in over time, that is not neccessarily part of dirigisme.
To quote Wiki, "Most modern economies can be characterized as dirigiste to some degree – for instance, state economic action may be exercised through subsidizing research and developing new technologies, or through government procurement, especially military (i.e. a form of mixed economy). China is the clearest example to date."
This is largely opposed by the ordoliberals, who prefer more of a market role (albeit with some government regulation to ensure that everyone plays fair) and are not too interested in Keynesian means. The "social market economy", on the other hand, is a variation of ordoliberalism that was basically its practical implementation in West Germany, which added in a social safety net.