linux-kernel - Re: [PATCH v8 4/4] NOTFORMERGE: drm/logicvc: Add plane colorkey support

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Date:   Wed, 23 Dec 2020 18:31:54 -0500
From:   Ilia Mirkin <imirkin@...m.mit.edu>
To:     Simon Ser <contact@...rsion.fr>
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        devicetree <devicetree@...r.kernel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH v8 4/4] NOTFORMERGE: drm/logicvc: Add plane colorkey support

FWIW this is something I added, hoping it was going to get used at
some point, but I never followed up with support in xf86-video-nouveau
for Xv. At this point, I'm not sure I ever will. I encoded the
"enabled" part into the value with a high bit (1<<24) -- not sure that
was such a great idea. All NVIDIA hardware supports colorkey (and not
actual alpha, until the very latest GPUs - Volta/Turing families),
although my implementation only covers the pre-G80 series (i.e. DX9
and earlier GPUs - pre-2008). Should a determination of usefulness be
reached, it would be easy to implement on the remainder though.

Cheers,

  -ilia

On Wed, Dec 23, 2020 at 5:20 PM Simon Ser <contact@...rsion.fr> wrote:
>
> nouveau already has something for colorkey:
> https://drmdb.emersion.fr/properties/4008636142/colorkey
>
> I know this is marked "not for merge", but it would be nice to discuss
> with them and come up with a standardized property.
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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