Completely refactor tone mapping, color spaces, everything

Supersedes !210 (closed)

Adds an extra commit to completely overhaul pl_color_space, merging it with conventional HDR metadata, nuking light, changing the way SDR curves are handled in libplacebo, and simplifying a lot of stuff.

TODO:

• Fix 3DLUT inputs (need to ingest black-scaled inputs!) (Edit: Nvm, this already round-trips because we encode in gamma light before feeding the content into the 3DLUT)
• Use direct GLSL for naive black point compensation
• Add fallbacks for the old fields (sig_peak etc.)
• Add automatic tone mapping curve selection heuristics
• Investigate possibility of black point shift (with the new ICC BPC changes)
• Add better gamut mapping algorithms this MR is large enough
• Parse primaries from ICC profile this MR is large enough
• Properly respect intent needs to be coordinated with downstream first
• fix PL_GAMUT_DARKEN black clipping

marked this merge request as draft

added 1 commit

• f759a261 - colorspace: completely refactor pl_color_space

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changed the description

added 11 commits

• 00c34554 - tone_mapping: add new tone mapping API
• 17d13b80 - shaders: tweak LUT selection logic
• 04839d32 - shaders/colorspace: use new tone mapping API
• e9dce242 - tests/bench: add HDR tone-mapping benchmark
• 432e39ef - demos/plplay: switch to new tone mapping API
• e32353ec - renderer: move peak detection to pl_render_high_quality_params
• b6fa6d53 - demos/plplay: implement target ICC profile loading
• 7deb10fa - demos/plplay: fix the 'disable tone mapping' check box
• ccf9f538 - demos/plplay: enable output color override by default
• 720e89e4 - demos/plplay: improve HDR level slider scaling
• 540cc08e - colorspace: completely refactor pl_color_space

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changed the description

mentioned in merge request !210 (closed)

Tested with a low nits frame and it seems plplay loses some contrast.
Comparison with madVR/master/refactor: https://slow.pics/c/sxx9pMOn

In the refactor image, the clouds are pretty flat.

File: https://0x0.st/orY4.hevc
edit: Fixed the ST2086 metadata, so now BT.2390 is nearly identical and BT.2446 is brighter.

added 9 commits

• c70552e5 - shaders/colorspace: use new tone mapping API
• 8bd3a304 - tests/bench: add HDR tone-mapping benchmark
• 20c007ca - demos/plplay: switch to new tone mapping API
• 0f1a8570 - renderer: move peak detection to pl_render_high_quality_params
• 8aa243ba - demos/plplay: implement target ICC profile loading
• ff6e544b - demos/plplay: fix the 'disable tone mapping' check box
• 3104debd - demos/plplay: enable output color override by default
• bcce21aa - demos/plplay: improve HDR level slider scaling
• 0be1f63c - colorspace: completely refactor pl_color_space

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changed the description

marked the checklist item Use direct GLSL for naive black point compensation as completed

added 15 commits

• 0be1f63c...9d506423 - 2 commits from branch master
• 7d6c8e1c - shaders/colorspace: simplify gamut clipping logic
• 8cd22944 - shaders/colorspace: disable gamut clipping by default
• e58d132d - tone_mapping: add new tone mapping API
• 0c0c51ab - shaders: tweak LUT selection logic
• e1e5c125 - shaders/colorspace: use new tone mapping API
• 4da63a96 - tests/bench: add HDR tone-mapping benchmark
• afce55a5 - demos/plplay: switch to new tone mapping API
• 90dbe03e - renderer: move peak detection to pl_render_high_quality_params
• 5be32a0e - demos/plplay: implement target ICC profile loading
• 38e4b860 - demos/plplay: fix the 'disable tone mapping' check box
• 8edb6196 - demos/plplay: enable output color override by default
• a3c1a011 - demos/plplay: improve HDR level slider scaling
• 6c75a52d - colorspace: completely refactor pl_color_space

Compare with previous version

marked the checklist item Add fallbacks for the old fields (sig_peak etc.) as completed

added 11 commits

• b6f8e7e9 - tone_mapping: add new tone mapping API
• 2192dafb - shaders: tweak LUT selection logic
• 73344933 - shaders/colorspace: use new tone mapping API
• e5c598d5 - tests/bench: add HDR tone-mapping benchmark
• 26387ab2 - demos/plplay: switch to new tone mapping API
• b9ae20ca - renderer: move peak detection to pl_render_high_quality_params
• 0845f7cf - demos/plplay: implement target ICC profile loading
• 1622face - demos/plplay: fix the 'disable tone mapping' check box
• 3065c6a9 - demos/plplay: enable output color override by default
• cc9aa1d8 - demos/plplay: improve HDR level slider scaling
• 95217422 - colorspace: completely refactor pl_color_space

Compare with previous version

added 11 commits

• 9c537166 - tone_mapping: add new tone mapping API
• a1f27450 - shaders: tweak LUT selection logic
• ef455ad3 - shaders/colorspace: use new tone mapping API
• 7c022105 - tests/bench: add HDR tone-mapping benchmark
• 7f2c58b8 - demos/plplay: switch to new tone mapping API
• 6a2e5085 - renderer: move peak detection to pl_render_high_quality_params
• 27419e49 - demos/plplay: implement target ICC profile loading
• cd19140c - demos/plplay: fix the 'disable tone mapping' check box
• fc146540 - demos/plplay: enable output color override by default
• 665bbbe5 - demos/plplay: improve HDR level slider scaling
• f1e08e77 - colorspace: completely refactor pl_color_space

Compare with previous version

added 11 commits

• f9a910b5 - tone_mapping: add new tone mapping API
• 396b3349 - shaders: tweak LUT selection logic
• fbadd3f4 - shaders/colorspace: use new tone mapping API
• 2e987400 - tests/bench: add HDR tone-mapping benchmark
• f864ef5d - demos/plplay: switch to new tone mapping API
• 35b80853 - renderer: move peak detection to pl_render_high_quality_params
• da829009 - demos/plplay: implement target ICC profile loading
• 16c110ae - demos/plplay: fix the 'disable tone mapping' check box
• d7f43e86 - demos/plplay: enable output color override by default
• 3d3227ee - demos/plplay: improve HDR level slider scaling
• bcef8159 - colorspace: completely refactor pl_color_space

Compare with previous version

marked the checklist item Add automatic tone mapping curve selection heuristics as completed

added 10 commits

• 0369eeb3 - shaders/colorspace: use new tone mapping API
• f5a66a56 - tests/bench: add HDR tone-mapping benchmark
• dfc6dd6d - demos/plplay: switch to new tone mapping API
• 9076ed4d - renderer: move peak detection to pl_render_high_quality_params
• ab42ab91 - demos/plplay: implement target ICC profile loading
• 7cdf6876 - demos/plplay: fix the 'disable tone mapping' check box
• 3e87409e - demos/plplay: enable output color override by default
• 030c7cb0 - demos/plplay: improve HDR level slider scaling
• 9cfd789f - colorspace: completely refactor pl_color_space
• d6f3d078 - (WIP) refactor gamut handling options

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changed the description