On Thu, 12 Mar 2020 18:01:12 +0200 Ville Syrjälä <ville.syrj...@linux.intel.com> wrote:
> On Thu, Mar 12, 2020 at 03:37:03PM +0000, Laxminarayan Bharadiya, Pankaj > wrote: > > > > > > > -----Original Message----- > > > From: Ville Syrjälä <ville.syrj...@linux.intel.com> > > > Sent: 12 March 2020 19:35 > > > To: Laxminarayan Bharadiya, Pankaj > > > <pankaj.laxminarayan.bharad...@intel.com> > > > Cc: jani.nik...@linux.intel.com; dan...@ffwll.ch; intel- > > > g...@lists.freedesktop.org; dri-de...@lists.freedesktop.org; > > > airl...@linux.ie; > > > maarten.lankho...@linux.intel.com; tzimmerm...@suse.de; > > > mrip...@kernel.org; mihail.atanas...@arm.com; linux- > > > ker...@vger.kernel.org; Nautiyal, Ankit K <ankit.k.nauti...@intel.com> > > > Subject: Re: [RFC][PATCH 0/5] Introduce drm scaling filter property > > > > > > On Tue, Feb 25, 2020 at 12:35:40PM +0530, Pankaj Bharadiya wrote: > > > > Integer scaling (IS) is a nearest-neighbor upscaling technique that > > > > simply scales up the existing pixels by an integer (i.e., whole > > > > number) multiplier. Nearest-neighbor (NN) interpolation works by > > > > filling in the missing color values in the upscaled image with that of > > > > the coordinate-mapped nearest source pixel value. > > > > > > > > Both IS and NN preserve the clarity of the original image. In > > > > contrast, traditional upscaling algorithms, such as bilinear or > > > > bicubic interpolation, result in blurry upscaled images because they > > > > employ interpolation techniques that smooth out the transition from > > > > one pixel to another. Therefore, integer scaling is particularly > > > > useful for pixel art games that rely on sharp, blocky images to > > > > deliver their distinctive look. > > > > > > > > Many gaming communities have been asking for integer-mode scaling > > > > support, some links and background: > > > > > > > > https://software.intel.com/en-us/articles/integer-scaling-support-on-i > > > > ntel-graphics http://tanalin.com/en/articles/lossless-scaling/ > > > > https://community.amd.com/thread/209107 > > > > https://www.nvidia.com/en-us/geforce/forums/game-ready-drivers/13/1002 > > > > /feature-request-nonblurry-upscaling-at-integer-rat/ > > > > > > > > This patch series - > > > > - Introduces new scaling filter property to allow userspace to > > > > select the driver's default scaling filter or Nearest-neighbor(NN) > > > > filter for scaling operations on crtc/plane. > > > > - Implements and enable integer scaling for i915 > > > > > > > > Userspace patch series link: TBD. > > > > > > That needs to be done or this will go nowhere. > > > > Yes, Sameer is working on enabling this feature in Kodi. > > Sameer, please share link here once you post patches. > > And who is doing it for other stuff? I think this would be most useful > for games/emulators and such so IMO we should find a way to get it to > the hands of users doing those things. > Hi, FWIW, being able to tell KMS to use nearest-neighbor filtering could be useful for https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/394 as a follow-up. Thanks, pq
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