On 2/26/24 21:10, 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.
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)
Why informational only? Having NEAREST and in general custom taps should
be possible on AMDGPU right?
We don't have to solve this now, but I just want to make sure that we
aren't locking this to info only.
Thanks
- Joshie 🐸✨
- 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@xxxxxxxxxxxxxxx>
Cc: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx>
Cc: Simon Ser <contact@xxxxxxxxxxx>
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Cc: Melissa Wen <mwen@xxxxxxxxxx>
Cc: Jonas Ådahl <jadahl@xxxxxxxxxx>
Cc: Sebastian Wick <sebastian.wick@xxxxxxxxxx>
Cc: Shashank Sharma <shashank.sharma@xxxxxxx>
Cc: Alexander Goins <agoins@xxxxxxxxxx>
Cc: Joshua Ashton <joshua@xxxxxxxxx>
Cc: Michel Dänzer <mdaenzer@xxxxxxxxxx>
Cc: Aleix Pol <aleixpol@xxxxxxx>
Cc: Xaver Hugl <xaver.hugl@xxxxxxxxx>
Cc: Victoria Brekenfeld <victoria@xxxxxxxxxxxx>
Cc: Sima <daniel@xxxxxxxx>
Cc: Uma Shankar <uma.shankar@xxxxxxxxx>
Cc: Naseer Ahmed <quic_naseer@xxxxxxxxxxx>
Cc: Christopher Braga <quic_cbraga@xxxxxxxxxxx>
Cc: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
Cc: Arthur Grillo <arthurgrillo@xxxxxxxxxx>
Cc: Hector Martin <marcan@xxxxxxxxx>
Cc: Liviu Dudau <Liviu.Dudau@xxxxxxx>
Cc: Sasha McIntosh <sashamcintosh@xxxxxxxxxx>
Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah@xxxxxxxxx>
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
