[Bug]: 10bit OpenGL Output Broken

[jemabaris]

What happened?

Today I built OpenRV 3.1.0 from source and had to discover that 10 bit output via OpenGL does not work. I am running 3 displays, one of them is 8bit+frc connected via displayport and configured for 10bit output in the Nvidia driver.
The next one is true 10 bit, also connected via displayport and also set to 10 bit in the Nvidia Control Panel.
The last is also true 10 bit, connected to a Blackmagic Decklink mini monitor 4k. GPU is an RTX 4090 running the latest studio driver (581.29), OS is Win11 24H2.
I built two versions of OpenRV 3.1.0, one with and one without the Blackmagic SDK. 10 bit via the GPU doesn't work with either build. 10 bit via the Decklink card works just fine. Toggling the "Video Sync" option also results in the same error: "Display Configuration is invalid"

I also checked again with OpenRV 2.2.0, which I have been using for the longest time now and there 10 bit output works perfectly fine for all connected displays.
EDIT: After going back and forth and testing some more it seems that now in RV 2.2.0 10bit isn't working either for the displays attached to the GPU and I'm seriously starting to question myself if it ever worked or if dreamed that or mixed it up with the dithering options....

Can anyone confirm that this is a general bug and not just a problem on my end? Is there something I can try to do about it myself?

If you need any further info, please let me know!

All the best

Janis

List all the operating systems versions where this is happening

Windows 11

On what computer hardware is this happening?

RTX4090, AMD 7950x3D, 16 cores, 128GB ram

Relevant console log output

Environment variables

No response

Extra information

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[pbergeron-adsk]

Hi @jemabaris --are you able to test this fix and tell me if this attempted fix corrects the problem for you?

SG-41275: Blind fix for 10-bit RGB (community bug 931) #1006

[jemabaris]

Hi @jemabaris --are you able to test this fix and tell me if this attempted fix corrects the problem for you?

SG-41275: Blind fix for 10-bit RGB (community bug 931) #1006

Thank you for the reply! I will do another build now and will let you know how things are looking :) Hope I still have all dependencies intact :D

[jemabaris]

Hi @jemabaris --are you able to test this fix and tell me if this attempted fix corrects the problem for you?

SG-41275: Blind fix for 10-bit RGB (community bug 931) #1006

So sadly this doesn't seem to have changed anything. 10bit is still not available as an option under "Video/Output Data Format" with "Output Module" set to "Desktop". When I use my Blackmagic Decklink card as output module 10bit is selectable and works fine.
Setting the "Display Output Format" under the "Rendering" tab to 10bit spits out the same OpenGL error as before.

All the best

Janis

[pbergeron-adsk]

Hi @jemabaris -- I know. I was working on this one most of the day. I eventually had to give up on it and updated the PR comment with this note:

UPDATE: I cannot find a way to work around the Qt bug below; the fix below may patch the RV side, but inside Qt itself, when it calls the format() method it will still see 8-8-8-2 meaning it's initializing things and its internal FBOs in a way that is out of our control.

I have requested support from the Qt forums, I'm hoping we can escalate this one faster but it may not be possible in the near term, tbc.

https://forum.qt.io/topic/163843/qopenglwidget-with-rgba-10-10-10-2-isn-t-created-correctly