More demo engine work! This week I tried implementing DOF.

Basically went horribly wrong at first, then turned out kinda nice, but only the completely-out-of-focus parts, and it's slow as shit on my gpu, hence the name :D

I'll continue to develop it but my gut feeling is the technique I'm using just won't work in the long run. But, the important thing is I tried AND made this in the demotool (with post still, tho :P) so it's served its purpose :)