Is it possible to create a glass roof slanted like the Shed Gabled Roof? Will I need transparent tiles for it?
I would say the best way to do this is to simply use the greenhouse roof. You can't change their roof angle though, they only come in two or three colors and don't let you do any of the other things that normal roofs allow.
Yes, there are transparent tiles that could probably be used, but I think they also have some drawbacks. The set I have, for example and which I've never actually used, do not transmit sunlight, if that makes a difference.