[Bug 94817] New: Nearest neighbor scaling?

[Bug 94817] New: Nearest neighbor scaling?

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=94817

            Bug ID: 94817
           Summary: Nearest neighbor scaling?
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: nw9165-3201-/E1597aS9LQAvxtiuMwx3w@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Hello,

would it be possible that you add a nearest-neighbor scaling mode to the
driver, so that one could display 1920x1080 natively on a 3840x2160 monitor or
1280x720 natively on a 2560x1440 monitor and so on (one pixel becomes four
pixels)?

There is some information on this topic over there:

https://forums.geforce.com/default/topic/844905/geforce-drivers/integer-scaling-mode/

Regards

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[Bug 94817] Nearest neighbor scaling?

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=94817

nw9165-3201-/E1597aS9LQAvxtiuMwx3w@public.gmane.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Hardware|Other                       |All

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[Bug 94817] Nearest neighbor scaling?

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https://bugs.freedesktop.org/show_bug.cgi?id=94817

--- Comment #1 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
I believe you can get this behaviour by setting the scaling mode property
to full. This should be possible with xrandr, or directly via the kms api.
It defaults to no scaling for external screens, as those usually have
better scalers built in.
On Apr 4, 2016 10:44 AM, <bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org> wrote:

> Bug ID 94817 <https://bugs.freedesktop.org/show_bug.cgi?id=94817>
> Summary Nearest neighbor scaling?
> Product xorg
> Version unspecified
> Hardware Other
> OS All
> Status NEW
> Severity enhancement
> Priority medium
> Component Driver/nouveau
> Assignee nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
> Reporter nw9165-3201-/E1597aS9LQAvxtiuMwx3w@public.gmane.org
> QA Contact xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org
>
> Hello,
>
> would it be possible that you add a nearest-neighbor scaling mode to the
> driver, so that one could display 1920x1080 natively on a 3840x2160 monitor or
> 1280x720 natively on a 2560x1440 monitor and so on (one pixel becomes four
> pixels)?
>
> There is some information on this topic over there:
> https://forums.geforce.com/default/topic/844905/geforce-drivers/integer-scaling-mode/
>
> Regards
>
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> You are receiving this mail because:
>
>    - You are the assignee for the bug.
>
>
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> https://lists.freedesktop.org/mailman/listinfo/nouveau
>
>

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[Bug 94817] Nearest neighbor scaling?

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https://bugs.freedesktop.org/show_bug.cgi?id=94817

--- Comment #2 from nw9165-3201-/E1597aS9LQAvxtiuMwx3w@public.gmane.org ---
Hi,

actually I have submitted the same feature request for the Intel and AMD
drivers and also for the NVIDIA proprietary one as well yesterday. It has
resulted in a patch for xrandr that allows to use nearest neighbor scaling now,
see:

https://bugs.freedesktop.org/show_bug.cgi?id=94816
https://bugs.freedesktop.org/show_bug.cgi?id=94820
https://bugs.freedesktop.org/show_bug.cgi?id=94819

Anyway, as already being discussed in those three threads, it would be
interesting to know if the dedicated hardware scaler inside the GPU could also
be used for this instead of using xrandr.

Can anyone comment on this?

Regards

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[Bug 94817] Nearest neighbor scaling?

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=94817

Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTABUG
             Status|NEW                         |RESOLVED

--- Comment #3 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
(In reply to nw9165-3201 from comment #2)
> Hi,
> 
> actually I have submitted the same feature request for the Intel and AMD
> drivers and also for the NVIDIA proprietary one as well yesterday. It has
> resulted in a patch for xrandr that allows to use nearest neighbor scaling
> now, see:
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=94816
> https://bugs.freedesktop.org/show_bug.cgi?id=94820
> https://bugs.freedesktop.org/show_bug.cgi?id=94819
> 
> Anyway, as already being discussed in those three threads, it would be
> interesting to know if the dedicated hardware scaler inside the GPU could
> also be used for this instead of using xrandr.
> 
> Can anyone comment on this?
> 
> Regards

The thing I suggested earlier will use hw for scaling. Run 'xrandr --props' to
find the exact property. IOW the feature already exists.

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