Ceramics and glasses are typically very sensitive to thermal gradients, so it's difficult to produce parts with SLS/SLM without cracking. This method is more common with ductile plastics and metals, and for structural application is still a WIP,

This is closer to a binder-jetting method, but a binder-glass composite can also be used for subtractive manufacturing which is typically very challenging with ceramics due to cracking.

SLS typically works with plastic not glass.

This is plastic that has glass dust in it. The plastic burns away during sintering.