DEATH STRANDING DIRECTOR'S CUT - HDR Fix

[mqhaji]

This mod fixes fundamental HDR implementation issues in DEATH STRANDING DIRECTOR'S CUT that cause severe hue shifts, oversaturation in highlights, and incorrect saturation/contrast overall.

RenoDX:

Vanilla HDR:

Core Issues Fixed

Tonemapping Problems:

• Game uses per-channel tonemapping and inverse tonemapping in order to apply an SDR LUT in HDR
• Highlights receive hideous hue shifts and look overbrightened, e.g. skies appear yellow/green instead of natural colors
• Fix: Use luminance-based tonemapping before LUT application, a custom function to apply SDR LUTs in HDR, and then per channel highlight rolloff

EOTF/PQ Encoding Issues:

• Game incorrectly modifies PQ function instead of applying proper 2.2 EOTF emulation and has no paper white control
• Fix: Implement correct SDR EOTF emulation, proper PQ encoding, and game brightness slider

Features

• Three tonemap modes: Vanilla, None, Vanilla+
• Peak/Game/UI brightness controls
• Luminance vs per-channel scaling and gamma correction toggles
• Color grading controls (exposure, highlights, shadows, contrast, saturation, highlight saturation, blowout, and flare)
• Dynamic peak nits detection

Results

• Eliminates yellow/green hue shifts in bright areas
• Proper HDR presentation matching original SDR intent, while reducing SDR hue shifts and blowout by a reasonable amount

REQUIRES HDR ON IN GAME

Repo Build: https://clshortfuse.github.io/renodx/renodx-deathstrandingdc.addon64