ChanServ changed the topic of #wayland to: https://wayland.freedesktop.org | Discussion about the Wayland protocol and its implementations, plus libinput
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<zzag>
jadahl: any chance that you could have a look at some of the session management MRs that I created for your w-p- fork?
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<zamundaaa[m]>
pq: I totally forgot to change Mesa to use gamma 2.2 for sRGB. There's now just one problem: VK_COLOR_SPACE_EXTENDED_SRGB_NONLINEAR_EXT
<pq>
mmhm
<emersion>
it seems like Mesa doesn't check extended_target_volume for scRGB
<zamundaaa[m]>
It currently maps to ext_srgb on the Wayland side, but Blender apparently uses it to avoid having to color manage their normal UI bits
<zamundaaa[m]>
Which seems reasonable, but using the piece-wise TF doesn't really make sense then
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<zamundaaa[m]>
emersion: right, such a check could be added
<pq>
zamundaaa[m], use set_tf_power(2.2)?
<zamundaaa[m]>
I'm not saying that the problem is gamma22 can't work, the problem is really that Vulkan refers to the scRGB specification
<zamundaaa[m]>
Which only specifies the piece-wise TF. Apparently it's not always used that way though :/
<emersion>
maybe mesa should be using windows_scrgb then?
<zamundaaa[m]>
That's linear
<pq>
The scRGB question is much more complicated than sRGB, because I am not aware of any display claiming to be scRGB.
<pq>
Maybe ask the Vulkan maintainers, what, if anything, the scRGB spec says about displaying it?
<zamundaaa[m]>
I don't think there's even a way for a display to signal it's apable of non-linear scRGB
<zamundaaa[m]>
I'm tempted to just remove it from the list of supported colorspaces
<pq>
I don't think there is an scRGB display, linear or not.
<zamundaaa[m]>
True, but linear is at least clearly defined
<pq>
not really
<pq>
the gamut is unknown
<pq>
Let's step back a bit: why the piece-wise TF doesn't make sense for scRGB?
<pq>
If the assumption is that sRGB is identical to scRGB limited to the unit cube codes, then the decoder should be gamma22. However, that will break everything outside of the unit cube if scRGB is used just as an encoding spec.
<pq>
I'm all for not supporting non-linear scRGB if possible.
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<zamundaaa[m]>
Alright, I'll rip it out entirely
<pq>
Maybe also ask Blender devs what they expected it to do, pointing out the 2.2 vs. 2.4 exponent making a big difference?
<zamundaaa[m]>
Afaict, no compositor supports ext_srgb right now anyways, so they're falling back to VK_COLOR_SPACE_SRGB_NONLINEAR_KHR
<zamundaaa[m]>
If they expect that to be piece-wise or gamma 2.2 is another question of course
<pq>
Do they lose anything by falling back?
<zamundaaa[m]>
They use normal sRGB with a floating point format, so I don't think it really changes anything
<emersion>
now i'm confused what create_windows_scrgb is about
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<zamundaaa[m]>
Windows scRGB encodes the "application expects pixels to be copied to the screen nit for nit" expectation of Windows apps, so that compositors can do something more sensible for games
<zamundaaa[m]>
There is also a Mesa issue about switching Vulkan's extended sRGB to it
<zamundaaa[m]>
Because it's what current apps expect
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