ACES / HDR Upgrades #6
Description
Various ACES 2.0 changes
- Change limiting and encoding color spaces from AP1 to Rec. 709/2100 to match display outputs.
- Change ACESOutputTransform to return the color in the encoding color space to remove excess chromatic adaptation that ACES presumably has already applied.
- Fix apply_white_scale never being called because UE_ACES_SCALE_WHITE is false. Currently, none of our code calls true though because our limiting/encoding spaces always have matching white points (both D65) for now.
- Remove white_limiting function, and fix clamp_zero_to_peakLuminance being called from the wrong place in the inverse function.
- Fix LUT not being updated if r.HDR.Aces.Version changes.
- Remove redundant peakLuminance parameter from outputTransform_fwd and outputTransform_inv functions.
#jira UE-231692
#rb eric.renaudhoude