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Draft: Add HDR10 support

Simon Ser requested to merge emersion/wlroots:hdr10 into master

Everything, everywhere, all at once: this is the combination of !4977 + !4988 and:

  • Direct scanout support
  • Mastering display metadata passthrough for direct scanout
  • Set output image descriptions
  • Set surface feedback image descriptions
  • Read luminance from EDID
  • Tone-mapping (better than a simple luminance multiplier)

The renderer naturally uses scRGB for blending since it doesn't clip and uses an FP16 intermediate buffer.

Sway patch: https://github.com/swaywm/sway/compare/master...emersion:hdr10

To test: checkout the Sway branch, start Sway with WLR_RENDERER=vulkan, enable 10-bit buffer on your HDR monitor (output XXX render_bit_depth 10), play an HDR video with mpv's latest commit and --vo=wayland-dmabuf (latest release won't work)

Closes: #3941

Edited by Simon Ser

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