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HDR: Implement HLG EOTF and OETF. · 06d3c07a
This allows us to use BT.2020 RGB linear for intermediate shaders, which also allows us to re-enable PeriodicVignetteProcessor, which should work properly in linear color-spaces. Manually tested by adding a GlEffectsWrapper, and confirming that HLG HDR editing still looks correct. PiperOrigin-RevId: 462265821 (cherry picked from commit 2f977eee)
huangdarwin committed
