It shouldn't be too difficult. Make two cardboard templates of the broken glass. Make sure to include the glass bite into the frame.
Install the first in the window after cleaning out all of the pieces. This confirms the size and fit.
Take the second template to a glass shop along with pieces of the broken glass. This will confirm color and thickness.
Make sure you order tempered glass. This will take a week or so.
The glass shop will send your template to their manufacturer where they will cut a piece of glass to match your template and then temper it.
Good Luck.