Cannot activate native HDR on Windows+Intel

[rrtt217]

When I try to open HDR images with tev, it says this in console:

   12:41:29 SUCCESS  Initialized IPC, listening on 127.0.0.1:14158
   12:41:32 SUCCESS  Loaded C:\Users\21899\.minecraft\DSC02060_HDR.avif via HEIF after 2.923 seconds.
   GLFW error 65545: WGL: Failed to find a suitable pixel format12:41:32 INFO     Initialized 10 bit fixed point frame buffer with primaries=bt709 transfer=srgb range=sdr

System Information:
Intel Core i5-12500H with Iris Xe Integrated GPU, HDR capable and enabled display.

On Linux (Debian 13 with KDE 6.3.6) tev is working fine and able to activate native HDR.

[Tom94]

Thanks a lot for letting me know.

From your logs, it seems like the Intel driver isn't giving tev an FP16 frame buffer, which Windows' docs say is the only way to do HDR outside of DirectX. And tev unfortunately doesn't use DirectX -- would be a huge undertaking to change.

Since you do manage to at least get a 10 bit frame buffer, I was hopeful tev could somehow tag an OpenGL buffer as being PQ/Rec.2020, but after scouring the web it really seems impossible. (Moving to ANGLE might be a feasible workaround, but that's another can of worms I'd rather not open right now.)

Could you tell me your Windows & driver versions just in case? I'll be trying to figure out which intel drivers / GPUs are affected, so I can put that limitation into the README at least.

[rrtt217]

Windows 24H2, Intel driver 32.0.101.7084 (latest)
BTW, I've found a way to activate HDR: https://github.com/pal1000/mesa-dist-win/ .Maybe because it just use D3D12.
You can use perappdeploy.cmd script and install it for tev.

[Tom94]

Thanks again; that's amazing!

I suppose using Mesa to translate GL to DX is similar in spirit to ANGLE -- but I didn't realize how simple it would be to deploy.

Will add a pointer to the README and leave this issue open until resolved without workaround.