[Bug] Shadows for objects/tiles offscreen do not render

[RabidZombie]

Shadows for objects that are too far offscreen do not render. This is especially jarring in the intro, when you see the shadows pop in/out.

Steps to reproduce:
1) Watch the intro. Pay attention to the shadows leaving/entering the screen.

Expected:
- Shadows smoothly animate onto screen.

Result:
- Shadow pop-in.

Notes:
- Game is run at 1366x768 fullscreen.
- Dxdiag: http://pastebin.com/ATsxWZrH