The rainbow treasure map: Advanced color management on Linux with AMD/Steam Deck – XDC 2023
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A guided tour of the AMD display driver code to identify hardware color capabilities on different versions, connect relevant parts of the shared code to DRM, and ultimately deliver a broader range of color features to the userspace. This work is another step towards advanced GPU-accelerated color management for Linux compositors, and it has already enabled improvements to HDR display support in SteamOS/Gamescope. So, what's the next treasure hunt? (c) X.Org Developer's Conference (XDC) 2023 October 17-19, 2023 A Coruña (Spain) https://indico.freedesktop.org/event/4/
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The rainbow treasure map: Advanced color management on Linux with AMD/Steam Deck – XDC 2023
- 1. The Rainbow Treasure Map Advanced Color Management on Linux with AMD/SteamDeck Melissa Wen XDC 2023 - A Coruña - Spain 1
- 2. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Technical Talk 2 1. XDC 2022 | "I'm not an AMD expert, but..." | Melissa Wen 2. XDC 2022 | Is HDR Harder? | Harry Wentland 3. XDC 2022 Lightning | HDR Workshop Summary | Harry Wentland 4. Color management and HDR documentation for FOSS graphics | Pekka Paalanen et al. 5. Cinematic Color - 2012 SIGGRAPH course notes | Jeremy Selan 6. AMD Driver-specific Properties for Color Management on Linux (Part 1) | Melissa Wen
- 3. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Advanced Color Management on Linux ● Wide variety of source content colorimetry (SDR/HDR/different color gamuts, profiles, etc.) ● Wide variety of output display devices ● Internal processing (window composition, etc) ● Users expect consistent color reproduction ● Linux kernel lacks an interface to manage the diversity of color profiles 3
- 4. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Driver-Specific Color Properties [PATCH v4 00/32] drm/amd/display: add AMD driver-specific properties for color mgmt ➔ Endless KMS generic color API ➔ Many uncertainties regarding the diversity of color capabilities among hardware vendors ➔ Gamescope is the userspace case (SteamOS 3.5) ➔ Advanced color management: gamut mapping, HDR rendering, SDR on HDR, HDR on SDR 4
- 5. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Steam Deck Kernel Driver ➔ Accelerated Processing Unit (APU) ➔ Product Name: STEAMDECK ➔ Code Reference: VANGOGH ➔ Display Driver: DCN3.01 (DCN3 family) 5
- 6. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Display Driver in the Linux/DRM DRM/KMS AMD Display Manager (DM) AMD Display Core (DC) kernel space 6
- 7. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Connecting DC and DRM DRM/KMS AMD Display Manager (DM) AMD Display Core (DC) kernel space 7
- 8. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Examining AMD DC DRM/KMS AMD Display Manager (DM) AMD Display Core (DC) kernel space 8
- 9. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Display Core Next (DCN) 9 https://dri.freedesktop.org/docs/drm/gpu/amdgpu/display/dcn-overview.html
- 10. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Display Core Next (DCN) - Color Caps 10 Pre-blending DPP: Display Pipe and Plane Post-blending MPC: Multiple Pipe/Plane Combined
- 11. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane 11
- 12. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane 12 John Travolta in Pulp Fiction
- 13. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamma Corr Gamut Remap HDR Mult Shaper RAM 3D LUT CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC AMD DC 13 Blending Blend Gamma
- 14. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamma Corr Gamut Remap HDR Mult Shaper RAM 3D LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC AMD DC 14 Blending Blend Gamma
- 15. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC AMD DC 15 Blending Gamma Corr Blend Gamma
- 16. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 16 Blending Gamma Corr Blend Gamma
- 17. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Plane Degamma TF and LUT Transition from encoded values to linear values for precise arithmetic operations Pre-defined TFs are hardcoded curves to DPP Degamma ROM block ● sRGB EOTF; ● BT.709 inverse OETF; ● PQ EOTF; ● Gamma 2.2, Gamma 2.4 and Gamma 2.6 EOTF 1D LUT supports 4096 entries to DPP Gamma Correction block The data is interpreted as an array of struct drm_color_lut elements 17 input func Degam ROM Gamma Corr Degamma LUT Degamma TF
- 18. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 18 Blending Gamma Corr Blend Gamma
- 19. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Plane CTM For color space conversion 3x4-dimensions matrix of fixed-points s31.32 set to DPP Gamut Remap block Remapping CRTC CTM to MPC Gamut Remap block 19 gamut remap Gamut Remap CTM
- 20. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 20 Blending Gamma Corr Blend Gamma
- 21. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 21 Blending Gamma Corr Blend Gamma
- 22. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Plane HDR Multiplier Applied to the color values of an image to increase their overall brightness Useful for converting images from SDR to HDR PQ TF is needed for any subsequent transforms 22 hdr mult HDR Mult HDR Mult
- 23. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 23 Blending Gamma Corr Blend Gamma
- 24. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Plane Shaper TF and LUT Delinearize/normalize the color space before applying a 3D LUT NO hardcoded curves Pre-defined TFs are calculated by AMD color module ● sRGB inverse EOTF; ● BT.709 OETF; ● PQ inverse EOTF; ● Gamma 2.2, Gamma 2.4 and Gamma 2.6 inverse EOTF. The color module combines TF and user LUT into the LUT to DPP Shaper LUT RAM block 24 shaper func Shaper RAM Shaper TF Shaper LUT
- 25. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 25 Blending Gamma Corr Blend Gamma
- 26. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Plane 3D LUT Suitable for complex color transformations and adjustments between color channels Supported size: 17x17x17 (4913 entries) and 9x9x9 (729) Tetrahedral interpolation Blue is the outermost dimension, red the innermost. 26 3dlut func 3D LUT 3D LUT
- 27. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 27 Blending Gamma Corr Blend Gamma
- 28. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD Plane Blend TF and LUT Linearize the color space again, after 3D LUT and before blending NO hardcoded curves Pre-defined TFs are calculated by AMD color module ● sRGB EOTF; ● BT.709 inverse OETF; ● PQ EOTF; ● Gamma 2.2, Gamma 2.4 and Gamma 2.6 EOTF. The color module combines TF and user LUT into the LUT to DPP Blend Gamma block 28 blend func Blend Gamma Blend TF Blend LUT
- 29. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Pre-blending: DRM plane + AMD DC DPP input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 29 Blending Gamma Corr Blend Gamma
- 30. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Post-blending: DRM CRTC + AMD DC MPC input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma TF Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 30 Blending Gamma Corr Blend Gamma
- 31. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 AMD CRTC Gamma TF Delinearize/convert to wire encoding NO hardcoded curves Pre-defined TFs are calculated by AMD color module ● sRGB inverse EOTF; ● BT.709 OETF; ● PQ inverse EOTF; ● Gamma 2.2, Gamma 2.4 and Gamma 2.6 inverse EOTF. The color module combines TF and user LUT into the LUT to MPC Gamma RAM block. 31 Gamma TF Gamma LUT out func Gamma RAM
- 32. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 DRM/AMD Color Management Pipeline input func gamut remap hdr mult shaper func 3dlut func blend func Degam ROM Gamut Remap HDR Mult Shaper RAM 3D LUT Blend Gamma Degamma LUT CTM HDR Mult Shaper TF 3D LUT Degamma TF Blend TF Shaper LUT Blend LUT DRM/AMD plane CTM gamut remap Gamut Remap Gamma TF Gamma LUT Degam LUT out func Gamma RAM DRM CRTC 32 Blending Gamma Corr
- 33. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 33 Steam Deck Color Pipeline AMD Driver-Specific Color Properties Image by catalyststuff on Freepik
- 34. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 34 https://github.com/ValveSoftware/gamescope/blob/master/src/docs/Steam%20Deck%20Display%20Pipeline.png
- 35. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 35
- 36. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 The search for the Rainbow treasure is not over! 36
- 37. The Rainbow Treasure Map: advanced color management on Linux with AMD/SteamDeck Melissa Wen, XDC 2023 Thank You! We're hiring www.igalia.com/jobs 37