HDR Enhancements for Devil May Cry 5

[mqhaji]

Summary

This pull request enhances the HDR processing in Devil May Cry 5 by addressing fundamental flaws in the default tonemapping and color grading methods used in the game. It introduces critical improvements to LUT sampling and gamma to provide a more accurate and immersive HDR experience.

Key Changes Introduced

• Refined Tonemapping: Implemented a Vanilla+ tonemapper that correctly handles peak white levels, removing the default tonemapping's tendency to overshoot and subsequently clip highlights, which obscured details and degraded the visual quality.
• Corrected Gamma: Fixed the game's original gamma correction that was likely an attempt at emulating the sRGB -> 2.2 gamma correction. renodx::color::correct::GammaSafe() is now used for proper gamma correction.
• Enhanced LUT Sampling: Revamped the application of SDR color grading LUTs for HDR output. This includes LUT scaling to adjusts black levels to enhance shadow detail while preserving midtones and highlights. UpgradeToneMap() paired with RenoDRTSmoothClamp() has been used to replace the game's original tonemapping and inverse tonemapping method to apply SDR LUTs to HDR, thus correcting broken looking highlight colors and better preserving the original artistic intent.

Conclusion

This mod significantly refines the HDR capabilities of Devil May Cry 5, correcting several key issues with the original game's HDR implementation. By adjusting how LUTs are applied and fixing the gamma correction, this mod not only enhances the visual fidelity of the game but also ensures that the HDR presentation is true to the creators' vision.