Tile-set with A-Z letters

[felipesanches]

We'll need this for printing text such as in the credits screen (#94) as well as in a title screen.

[lpereira]

I started working on this yesterday. The font tileset has to be separate from the normal tileset because we can then compress it better (1bpp bitmaps). I like the way this blog post here did it (although we might want to choose a free font, of course, but the way they do the lookup is kinda nice).

One of the things I wanna do is a GUI similar to the one in zsnes. I started this yesterday too, and I already have some routines to draw windows and text. Here's how's it looking at this point:

This window is generated by this code:

    message_box("Some dialog",
                "Hello, world\n"
                "Multi\n"
                "Line\n"
                "Text!");

If the palette looks weird is that because if there's a window open, all the colors not used by the window are darkened. The palette is restored once the window is closed.

The window looks like a Windows 95 knockoff, but I'm planning to make it look a whole lot nicer, maybe with a different color palette that doesn't scream like "database software from the 1990s". This was just easy to do to start. The font is terrible, too! Really need some proportional width font, otherwise it looks like garbage.