[RFC PATCH v4 00/42] Color Pipeline API w/ VKMS
Joshua Ashton
joshua at froggi.es
Thu Feb 29 15:31:29 UTC 2024
On 2/29/24 10:43, Daniel Vetter wrote:
> On Mon, Feb 26, 2024 at 04:10:14PM -0500, Harry Wentland wrote:
>> This is an RFC set for a color pipeline API, along with a sample
>> implementation in VKMS. All the key API bits are here. VKMS now
>> supports two named transfer function colorops and two matrix
>> colorops. We have IGT tests that check all four of these colorops
>> with a pixel-by-pixel comparison that checks that these colorops
>> do what we expect them to do with a +/- 1 8 bpc code point margin.
>
> So vkms is definitely great to make sure the igts are generic enough and
> somewhat useful, but ... does steam run on vkms too? I think that would be
> a really good test to show that the api we have here is actually useful
> for compositors in a cross-driver way, and not just a neat idea that
> doesn't survive harsh reality.
>
> And yes I realize that's probably going to be a bunch of work, but I feel
> like the color pipeline discussion has dragged around enough in
> hypotheticals and concerns that I think it would really help a lot.
I don't think we have ever tested Steam/Gamescope on vkms.
The last time I tried stuff there, there was all the problems with the
ttm page table tail thing for virtio stuff that made using Steam games +
Gamescope unfeasable because Vulkan + bindless, but I have heard those
are solved now?
I will have to try it again at the weekend and see where it's at.
I am willing to place my bets that some part of the stack will fall over
relating to modifiers somehow... =P
But yes, testing there would be good too, as we have the full Steam Deck
OLED HDR color pipeline implemented in shader-based composition
validated as being 1:1 on a suite of HDR and SDR test images.
(That *will* definitely rely on 3D LUTs being tetrahedrally interpolated
though)
I'll have a look at this at the weekend and also see about getting a
Gamescope branch that uses the new wip colorop stuff.
- Joshie 🐸✨
>
> Thoughts?
> -Sima
>
>>
>> The big new change with v4 is the addition of an amdgpu color
>> pipeline, for all AMD GPUs with DCN 3 and newer. Amdgpu now support
>> the following:
>>
>> 1. 1D Curve EOTF
>> 2. 3x4 CTM
>> 3. Multiplier
>> 4. 1D Curve Inverse EOTF
>> 5. 1D LUT
>> 6. 1D Curve EOTF
>> 7. 1D LUT
>>
>> The supported curves for the 1D Curve type are:
>> - sRGB EOTF and its inverse
>> - PQ EOTF, scaled to [0.0, 125.0] and its inverse
>> - BT.2020/BT.709 OETF and its inverse
>>
>> Note that the 1st and 5th colorops take the EOTF or Inverse
>> OETF while the 3rd colorop takes the Inverse EOTF or OETF.
>>
>> We are working on two more ops for amdgpu, the HDR multiplier
>> and the 3DLUT, which will give us this:
>>
>> 1. 1D Curve EOTF
>> 2. 3x4 CTM
>> 3. HDR Multiplier
>> 4. 1D Curve Inverse EOTF
>> 5. 1D LUT
>> 6. 3D LUT
>> 7. 1D Curve EOTF
>> 8. 1D LUT
>>
>> This, essentially mirrors the color pipeline used by gamescope
>> and presented by Melissa Wen, with the exception of the DEGAM
>> LUT, which is not currently used. See
>> [1] https://indico.freedesktop.org/event/4/contributions/186/attachments/138/218/xdc2023-TheRainbowTreasureMap-MelissaWen.pdf
>>
>> After this we'd like to also add the following ops:
>> - Scaler (Informational only)
>> - Color Encoding, to replace drm_plane's COLOR_ENCODING
>> - Color Range, to replace drm_plane's COLOR_RANGE
>>
>> This patchset is grouped as follows:
>> - Patches 1-3: couple general patches/fixes
>> - Patches 4-7: introduce kunit to VKMS
>> - Patch 7: description of motivation and details behind the
>> Color Pipeline API. If you're reading nothing else
>> but are interested in the topic I highly recommend
>> you take a look at this.
>> - Patches 7-27: DRM core and VKMS changes for color pipeline API
>> - Patches 28-40: DRM core and amdgpu changes for color pipeline API
>>
>> VKMS patches could still be improved in a few ways, though the
>> payoff might be limited and I would rather focus on other work
>> at the moment. The most obvious thing to improve would be to
>> eliminate the hard-coded LUTs for identity, and sRGB, and replace
>> them with fixed-point math instead.
>>
>> There are plenty of things that I would like to see here but
>> haven't had a chance to look at. These will (hopefully) be
>> addressed in future iterations, either in VKMS or amdgpu:
>> - Clear documentation for each drm_colorop_type
>> - Add custom LUT colorops to VKMS
>> - Add pre-blending 3DLUT
>> - How to support HW which can't bypass entire pipeline?
>> - Add ability to create colorops that don't have BYPASS
>> - Can we do a LOAD / COMMIT model for LUTs (and other properties)?
>> - read-only scaling colorop which defines scaling taps and position
>> - read-only color format colorop to define supported color formats
>> for a pipeline
>> - named matrices, for things like converting YUV to RGB
>>
>> IGT tests can be found at
>> https://gitlab.freedesktop.org/hwentland/igt-gpu-tools/-/merge_requests/1
>>
>> IGT patches are also being sent to the igt-dev mailing list.
>>
>> If you prefer a gitlab MR for review you can find it at
>> https://gitlab.freedesktop.org/hwentland/linux/-/merge_requests/5
>>
>> v4:
>> - Add amdgpu color pipeline (WIP)
>> - Don't block setting of deprecated properties, instead pass client cap
>> to atomic check so drivers can ignore these props
>> - Drop IOCTL definitions (Pekka)
>> - Use enum property for colorop TYPE (Pekka)
>> - A few cleanups to the docs (Pekka)
>> - Rework the TYPE enum to name relation to avoid code duplication (Pekka)
>> - Add missing function declarations (Chaitanya Kumar Borah)
>> - Allow setting of NEXT property to NULL in _set_ function (Chaitanya Kumar Borah)
>> - Add helper for creation of pipeline drm_plane property (Pekka)
>> - Always create Bypass pipeline (Pekka)
>> - A bunch of changes to VKMS kunit tests (Pekka)
>> - Fix index in CTM doc (Pekka)
>>
>> v3:
>> - Abandon IOCTLs and discover colorops as clients iterate the pipeline
>> - Remove need for libdrm
>> - Add color_pipeline client cap and make mutually exclusive with
>> COLOR_RANGE and COLOR_ENCODING properties
>> - add CTM colorop to VKMS
>> - Use include way for kunit testing static functions (Arthur)
>> - Make TYPE a range property
>> - Move enum drm_colorop_type to uapi header
>> - and a bunch of smaller bits that are highlighted in the relevant commit
>> description
>>
>> v2:
>> - Rebased on drm-misc-next
>> - Introduce a VKMS Kunit so we can test LUT functionality in vkms_composer
>> - Incorporate feedback in color_pipeline.rst doc
>> - Add support for sRGB inverse EOTF
>> - Add 2nd enumerated TF colorop to VKMS
>> - Fix LUTs and some issues with applying LUTs in VKMS
>>
>> Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
>> Cc: Pekka Paalanen <pekka.paalanen at collabora.com>
>> Cc: Simon Ser <contact at emersion.fr>
>> Cc: Harry Wentland <harry.wentland at amd.com>
>> Cc: Melissa Wen <mwen at igalia.com>
>> Cc: Jonas Ådahl <jadahl at redhat.com>
>> Cc: Sebastian Wick <sebastian.wick at redhat.com>
>> Cc: Shashank Sharma <shashank.sharma at amd.com>
>> Cc: Alexander Goins <agoins at nvidia.com>
>> Cc: Joshua Ashton <joshua at froggi.es>
>> Cc: Michel Dänzer <mdaenzer at redhat.com>
>> Cc: Aleix Pol <aleixpol at kde.org>
>> Cc: Xaver Hugl <xaver.hugl at gmail.com>
>> Cc: Victoria Brekenfeld <victoria at system76.com>
>> Cc: Sima <daniel at ffwll.ch>
>> Cc: Uma Shankar <uma.shankar at intel.com>
>> Cc: Naseer Ahmed <quic_naseer at quicinc.com>
>> Cc: Christopher Braga <quic_cbraga at quicinc.com>
>> Cc: Abhinav Kumar <quic_abhinavk at quicinc.com>
>> Cc: Arthur Grillo <arthurgrillo at riseup.net>
>> Cc: Hector Martin <marcan at marcan.st>
>> Cc: Liviu Dudau <Liviu.Dudau at arm.com>
>> Cc: Sasha McIntosh <sashamcintosh at google.com>
>> Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>
>>
>> Alex Hung (10):
>> drm/colorop: define a new macro for_each_new_colorop_in_state
>> drm/amd/display: Skip color pipeline initialization for cursor plane
>> drm/amd/display: Add support for sRGB EOTF in DEGAM block
>> drm/amd/display: Add support for sRGB Inverse EOTF in SHAPER block
>> drm/amd/display: Add support for sRGB EOTF in BLND block
>> drm/colorop: Add 1D Curve Custom LUT type
>> drm/amd/display: add shaper and blend colorops for 1D Curve Custom LUT
>> drm/amd/display: add 3x4 matrix colorop
>> drm/colorop: Add mutliplier type
>> drm/amd/display: add multiplier colorop
>>
>> Harry Wentland (32):
>> drm: Don't treat 0 as -1 in drm_fixp2int_ceil
>> drm: Add helper for conversion from signed-magnitude
>> drm: Correctly round for fixp2int_round
>> drm/vkms: Round fixp2int conversion in lerp_u16
>> drm/vkms: Create separate Kconfig file for VKMS
>> drm/vkms: Add kunit tests for VKMS LUT handling
>> drm/vkms: Avoid reading beyond LUT array
>> drm/doc/rfc: Describe why prescriptive color pipeline is needed
>> drm/colorop: Introduce new drm_colorop mode object
>> drm/colorop: Add TYPE property
>> drm/colorop: Add 1D Curve subtype
>> drm/colorop: Add BYPASS property
>> drm/colorop: Add NEXT property
>> drm/colorop: Add atomic state print for drm_colorop
>> drm/plane: Add COLOR PIPELINE property
>> drm/colorop: Add NEXT to colorop state print
>> drm/vkms: Add enumerated 1D curve colorop
>> drm/vkms: Add kunit tests for linear and sRGB LUTs
>> drm/colorop: Introduce DRM_CLIENT_CAP_PLANE_COLOR_PIPELINE
>> drm/colorop: Add 3x4 CTM type
>> drm/vkms: Pull apply_colorop out of pre_blend_color_transform
>> drm/vkms: Use s32 for internal color pipeline precision
>> drm/vkms: add 3x4 matrix in color pipeline
>> drm/tests: Add a few tests around drm_fixed.h
>> drm/vkms: Add tests for CTM handling
>> drm/colorop: pass plane_color_pipeline client cap to atomic check
>> drm/amd/display: Ignore deprecated props when plane_color_pipeline set
>> drm/amd/display: Add bypass COLOR PIPELINE
>> drm/colorop: Add PQ 125 EOTF and its inverse
>> drm/amd/display: Enable support for PQ 125 EOTF and Inverse
>> drm/colorop: add BT2020/BT709 OETF and Inverse OETF
>> drm/amd/display: Add support for BT.709 and BT.2020 TFs
>>
>> Documentation/gpu/rfc/color_pipeline.rst | 360 ++++++++
>> drivers/gpu/drm/Kconfig | 14 +-
>> drivers/gpu/drm/Makefile | 1 +
>> .../gpu/drm/amd/display/amdgpu_dm/Makefile | 3 +-
>> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 4 +
>> .../amd/display/amdgpu_dm/amdgpu_dm_color.c | 352 ++++++++
>> .../amd/display/amdgpu_dm/amdgpu_dm_colorop.c | 160 ++++
>> .../amd/display/amdgpu_dm/amdgpu_dm_colorop.h | 36 +
>> .../amd/display/amdgpu_dm/amdgpu_dm_plane.c | 32 +
>> drivers/gpu/drm/drm_atomic.c | 161 +++-
>> drivers/gpu/drm/drm_atomic_helper.c | 12 +
>> drivers/gpu/drm/drm_atomic_state_helper.c | 5 +
>> drivers/gpu/drm/drm_atomic_uapi.c | 158 ++++
>> drivers/gpu/drm/drm_colorop.c | 411 +++++++++
>> drivers/gpu/drm/drm_ioctl.c | 7 +
>> drivers/gpu/drm/drm_mode_config.c | 7 +
>> drivers/gpu/drm/drm_plane.c | 52 ++
>> drivers/gpu/drm/tests/Makefile | 3 +-
>> drivers/gpu/drm/tests/drm_fixp_test.c | 69 ++
>> drivers/gpu/drm/vkms/Kconfig | 20 +
>> drivers/gpu/drm/vkms/Makefile | 4 +-
>> drivers/gpu/drm/vkms/tests/.kunitconfig | 4 +
>> drivers/gpu/drm/vkms/tests/vkms_color_tests.c | 449 ++++++++++
>> drivers/gpu/drm/vkms/vkms_colorop.c | 100 +++
>> drivers/gpu/drm/vkms/vkms_composer.c | 135 ++-
>> drivers/gpu/drm/vkms/vkms_drv.h | 8 +
>> drivers/gpu/drm/vkms/vkms_luts.c | 802 ++++++++++++++++++
>> drivers/gpu/drm/vkms/vkms_luts.h | 12 +
>> drivers/gpu/drm/vkms/vkms_plane.c | 2 +
>> include/drm/drm_atomic.h | 122 +++
>> include/drm/drm_atomic_uapi.h | 3 +
>> include/drm/drm_colorop.h | 301 +++++++
>> include/drm/drm_file.h | 7 +
>> include/drm/drm_fixed.h | 35 +-
>> include/drm/drm_mode_config.h | 18 +
>> include/drm/drm_plane.h | 13 +
>> include/uapi/drm/drm.h | 16 +
>> include/uapi/drm/drm_mode.h | 14 +
>> 38 files changed, 3882 insertions(+), 30 deletions(-)
>> create mode 100644 Documentation/gpu/rfc/color_pipeline.rst
>> create mode 100644 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.c
>> create mode 100644 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_colorop.h
>> create mode 100644 drivers/gpu/drm/drm_colorop.c
>> create mode 100644 drivers/gpu/drm/tests/drm_fixp_test.c
>> create mode 100644 drivers/gpu/drm/vkms/Kconfig
>> create mode 100644 drivers/gpu/drm/vkms/tests/.kunitconfig
>> create mode 100644 drivers/gpu/drm/vkms/tests/vkms_color_tests.c
>> create mode 100644 drivers/gpu/drm/vkms/vkms_colorop.c
>> create mode 100644 drivers/gpu/drm/vkms/vkms_luts.c
>> create mode 100644 drivers/gpu/drm/vkms/vkms_luts.h
>> create mode 100644 include/drm/drm_colorop.h
>>
>> --
>> 2.44.0
>>
>
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