Re:Nvidia Unveils GeForce RTX 30 Series GPUs
by formerly_proven on Tuesday September 01, 2020 @04:01PM
(#24346337)
This isn't a firmware issue, because enabling this would require adding the hardware to the scaler ASIC to actually process multiple video streams, and to increase the buffer size and bandwidth n-fold so that it can synchronize and composite the unsynced video sources (also introducing 1+ frames of latency).
[ Parent
| on HN ]
Re:Nvidia Unveils GeForce RTX 30 Series GPUs
by derefr on Tuesday September 01, 2020 @07:15PM
(#24348225)
The GP was assuming a scaler that already supported a Picture-in-Picture or split-screen feature—as many modern monitors do!
The problem—and it is purely a firmware problem—is that all such monitors make this kind of support "dumb", with hardcoded geometry (i.e. split-screen as exactly halving or quartering the screen; PiP as putting one input in an box that composites over exactly the upper-left quarter of the lower-right quadrant of the screen.)
There's nothing in the scaler ASIC that particularly benefits from these numbers being hardcoded, such that its job would be any more complex if they were controllable via machine-registers POKEable using HDMI-CEC commands.