Well everyone, I didn't wait for your answer and went ahead. It's possible to recover from the Terasic demo code what is needed to initialize the LCD, display pixels anywhere in any color, as well as the bitmaps for a number of character fonts.
Terasic's functions for drawing geometry and printing strings are hugely inefficient, obviously lifted from a more generic library intended for more powerful processors. If you're proficient in C and bit manipulation, however, it's not very difficult to do your own "printf".
If you need help, reply to this post.