I don't know what deffered shading is, maybe I should search later but I don't plan to have a very nice rendering now, but, just a 2D isometric RPG. (If I can create one I'll be very happy)
As you said, i didn't advanced, because I had to put every source code in a library and rewrite all the source code of Gregouar for all my projects. (And adding some functionnality like the networking, etc...)
His code was not maintenable and, I hate copy/paste source code because I don't learn and I don't understand anything.
My shadows are not very different than the ones of Gregouar, it's him which have initialized me to the game creation univers in 2D iso.
Maybe he have improved them a bit after but I don't see something different.
I've added a transparent outline around the shadows, it seems to be better but I need to have rounded corners for the ani-aliasing, but, SFML don't provide a way to create shapes with rounded corners and I have to implement it myself later.
But please, don't bring some displaced behaviour from this website here.
I really hope this website'll not become like this website and I don't want to wasting time with some members of this website again.
So I say, say ya.
PS : And I can create orthographic and perspective projection with odfaeg, and loading 3D animated models soon (but I want to finish my 2D isometric game first), so, don't say wrong things here please.