On Sun, Jun 19, 2022 at 09:31:03PM -0100, Melissa Wen wrote: > Add 3D LUT for gammar correction using a 3D lookup table. The position > in the color correction pipeline where 3D LUT is applied depends on hw > design, being after CTM or gamma. If just after CTM, a shaper lut must > be set to shape the content for a non-linear space. That details should > be handled by the driver according to its color capabilities. I also cooked up a WIP 3D LUT support some time ago for Intel hw: https://github.com/vsyrjala/linux/commits/3dlut But that dried up due to having no userspace for it. I also cooked up some basic igts for it: https://patchwork.freedesktop.org/series/90165/ <snip> > + * “LUT3D”: > + * Blob property to set the 3D LUT mapping pixel data after the color > + * transformation matrix and before gamma 1D lut correction. On Intel hw the 3DLUT is after the gamma LUT in the pipeline, which is where I placed it in my branch. There is now some discussion happening about exposing some kind of color pipeline description/configuration properties: https://gitlab.freedesktop.org/pq/color-and-hdr/-/issues/11 -- Ville Syrjälä Intel
