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<MrCooper>
tzimmermann: re your gamma LUT helper series, using gamma 2.2 for the default ramps would most certainly be wrong, the gamma 2.2 conversion happens later in the display pipeline, usually in the monitor
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<pq>
MrCooper, that depends... what's it used for?
<pq>
ok, the idea in the explanation is not quite right.
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<tzimmermann>
MrCooper. ok, thnaks for the note. the monitor uses 2.2. so the helpers would use the inverse, right?
<tzimmermann>
but as the cover letter says, it's not implemented anyway
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<pq>
tzimmermann, not really. All software currently assumes that KMS won't... well, current software assumes that drivers behave like they always have.
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<tzimmermann>
then we better not implement this idea
<tzimmermann>
the current code uses a linear ramp, which everything seem sto be ok with
<pq>
yes, it's no-op (I assume also hardware-wise?) so that's good.
<pq>
tzimmermann, a monitor applies the power-2.2 curve on emitting the light. Userspace assumes that that is what happens. Making the ramp non-identity to break it.
<pq>
*would break it
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<tzimmermann>
pq, but userspace is also expected to program the gamma ramp
<pq>
sure - but then it's in addition to what the monitor already does.
<tzimmermann>
the default would *only* ever be used if userspace does not set the gamma ramp
<pq>
does fbcon reset the ramp, btw?
<tzimmermann>
the helpers do not apply a gamma ramp in addition to what userspace sets
<pq>
fbcon really should reset it
<tzimmermann>
don't know
<tzimmermann>
but if, i've never seen code that computes a sophisticated gamma ramp
<pq>
That's how KMS hand-off works, one better re-program *everything* when gaining DRM master.
<pq>
reset it to identity, I mean
<tzimmermann>
that's how these helpers currently work (and also the drivers from which they come). so things should be fine
<pq>
Anyway, the fact that pixel values go through power-2.2 before emitted as light intensity is a good thing. If that curve didn't exist, we'd have much poorer image quality.
<pq>
cool
<pq>
I'm just used to running fbcon in HDR mode, because fbcon does not reset all KMS properties. And I think the ramps used to be a similar problem, too. :-)
<pq>
...actually that's fbdev, sorry. That monitor doesn't have a console.
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<MrCooper>
pq tzimmermann: pretty sure fbcon still doesn't restore its gamma ramp when switching to one of its VTs
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<rburton>
good day, all. quick one: is spirv-tools a build-time only dependency for mesa, or is a part of it needed at runtime?
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<DragoonAethis>
rburton: it's a runtime dependency for some debugging tools in Mesa (assembly dumps)
<rburton>
sounds like something i can not install by default, thanks
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