On Wed, Jun 9, 2021 at 2:19 PM Jason Ekstrand <ja...@jlekstrand.net> wrote: > > +Nanley > > We've not defined those yet. We had some internal talks a couple > years ago. The rough idea we had at the time was to define a modifier > for those cases which put the CCS after each main surface at some > fixed calculation offset based on width, height, and stride. Then the > one modifier would apply independently to the three different planes. > > --Jason > > On Wed, Jun 9, 2021 at 2:11 PM Chad Versace <c...@kiwitree.net> wrote: > > > > The Problem: For a given 3-tuple (multi-planar format, DRM format modifier, > > chipset), we need Intel ABI that decides (a) the value of > > VkDrmFormatModifierPropertiesEXT::drmFormatModifierPlaneCount and (b) the > > content of each "modifier" plane. > > > > For example, suppose drmFormatModifierPlaneCount is 2 for > > (VK_FORMAT_G8_B8R8_2PLANE_420_UNORM, INTEL_FORMAT_MOD_FOO). Is the layout > > (plane1=g8, plane2=b8r8); or is it (plane1=g8_b8r8, plane2=aux)? The second > > choice isn't crazy; iirc, some non-Intel hardware (sorry, NDA) uses only 2 > > modifier planes for color-compressed 3-planar formats, with > > (plane1=r8_g8_b8, plane2=aux). > > > > I'm asking because Yiwei (cc'd) has begun implementing limited support for > > multi-planar formats in Anvil in order to pass the Android CTS. To support > > more media formats (for imminent Chrome OS projects and future vanilla > > Linux stuff too), we need to decide on some ABI.
Hi, I have sent a MR(https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11281) to add the minimal multi-planar format support with drm format modifier, so that Venus Android AHB extension layered on top of ANV VK_EXT_image_drm_format_modifier implementation can pass all the interop graphics cts for camera and media. I'd be interested to follow up about the stable ABI for this to expand multi-planar support there. Best, Yiwei _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
