I don't have the XDK to hand - however, I do have a phenomenally powered HD capture system that can capture at any resolution up to 1920x1200, a retail Xbox 360, VGA cable, and Dead or Alive 4 demo
The only way right now to get big resolution from Xbox 360 is to use 1280x1024 and set it to Widescreen mode. So effectively we're getting 1024p - not that far off 1080p, and tons more vertical resolution than 720p. So any vertical scaling should be obvious to behold.Here's
a capture of the DOA4 demo running in this resolution. The only scaling artefacts I'm seeing are horizontal in nature due to a 16:9 image running in a 4:3 resolution.This
is that same image rescaled to widescreen in Photoshop - 1860x1024 (not a million miles away from 1920x1080). Obviously it's been scaled a fair bit horizontally but it still looks better than 720p.Here
is image 1 scaled to 1280x720. It definitely looks to me like resolution has been lost...
Finally, This one
is the 720p image scaled back up to 1860x1024, ie to match image 2. Looks a bit fuzzier, but the difference is not as pronounced as I would hope.
So far from conclusive but I'd say that there is a some merit to this story that the 360 already has a catalogue of 1080p titles. And if it is just good scaling... well, then the 360 has a very nice scaler.
If any one wants TIFF versions of these files, please PM me with an FTP address and I'll upload them for you. In the meantime, I'll see about the resolution these games produce when the framebuffer itself is dumped. That's the only way to be sure.