This github repo (fw-public) consists of shared code made available for use under the Creative Commons CCO license. This code is extracted from the Filmic Worlds, LLC codebase.
The Filmic Tone Curve includes a filmic tonemapping curve using three segments of a power curve. The Filmic Color Grading include the tone curve as well as several operations for Exposure, Color Balance, Saturation, Contrast, and Lift/Gamma/Gain.
FilmicColorGrading::UserParams userParams; // User params are the input
...
FilmicColorGrading::RawParams rawParams; FilmicColorGrading::EvalParams evalParams; FilmicColorGrading::BakedParams bakeParams;
FilmicColorGrading::RawFromUserParams(rawParams, userParams); FilmicColorGrading::EvalFromRawParams(evalParams,rawParams); FilmicColorGrading::BakeFromEvalParams(bakeParams,evalParams,256,FilmicColorGrading::kTableSpacing_Quadratic);
...
Vec3 srcColor = ...;
Vec3 dstColor = bakeParams.Eval(srcColor);