It's taking a temporal Resolution from the previous frame and and injecting them into the new frames image, while jittering the pixel count to a higher resolution... It can be done at 1080p 1440p or 1800p to resolve at 2160p when using
a 4k frame buffer... This is what Insomniac has used on both Ratchet and Clank and Spider - Man... The Technique was developed by Epic games and then used by Ubisoft for For Honor on PS4 and XBOX One X...
Not exact matches
With CBR draw calls don't draw to the full
frame buffer (which would be native) but to a checkerboard pattern with less the pixels (hence the name), the rest of the pixels is extrapolated with data from the last
frame (most common used implementation of CBR is a 50/50 split of pixels but you can go with any split you chose to), Temporal injection instead uses data from previous
frames of a lower native resolution to extrapolate the
4K image.
However, during the GDC 2018 Optimizing UE4 for Fortnite: Battle Royale presentation, Epic showed a slide indicated that they are targeting a full
4K (2160p) resolution as the max
frame buffer soon on the console.
Lose yourself in worlds built for true
4K gaming, where action comes to life with 2160p
frame buffers and 6 teraflops of graphical processing power.
Xbox One X is built for true
4K gaming, which combines 2160p
frame buffers, High Dynamic Range and Wide Color Gamut into a pristine visual package.