A Mario fangame! It's a fangame! With Mario!

[Yal]

Were there a relative drawing function for tile layers, I wouldn't be jumping through hoops as it is.

You could always use a surface, render the tiles to that, and draw it somewhere. Or use two views. I learned a nifty little trick: if you have a view outside the room region (Behind The Black of the top-left corner) and have background color disabled, the stuff drawn on it will feature transparent pixels where there is nothing. If this view is drawn on the screen on top of another view, you can use this effect to e.g. create a non-rotating HUD on a view_angle'd view... or use a normal view for the background and the BDB view for the game.


As for the pixels:
Use a counter so that you move the tiles, say, 1 pixel every 2nd step or so, or every 4th step. (Basically, use a counter to see how many fractions of a pixels the background oughta have moved, and when it's a whole pixel or more, move the tiles and adjust the counter accordingly). I did that with the intro parallax in Shattered World to get the mountains right.