playcanvas/build/playcanvas.dbg/src/scene/shader-lib/wgsl/chunks/common/frag/tonemapping/tonemappingAces2.js

PlayCanvas WebGL game engine

var tonemappingAces2PS = /* wgsl */ `
uniform exposure: f32;

// ACES approximation by Stephen Hill

// sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT
const ACESInputMat: mat3x3f = mat3x3f(
    vec3f(0.59719, 0.35458, 0.04823),
    vec3f(0.07600, 0.90834, 0.01566),
    vec3f(0.02840, 0.13383, 0.83777)
);

// ODT_SAT => XYZ => D60_2_D65 => sRGB
const ACESOutputMat: mat3x3f = mat3x3f(
    vec3f( 1.60475, -0.53108, -0.07367),
    vec3f(-0.10208,  1.10813, -0.00605),
    vec3f(-0.00327, -0.07276,  1.07602)
);

fn RRTAndODTFit(v: vec3f) -> vec3f {
    let a: vec3f = v * (v + vec3f(0.0245786)) - vec3f(0.000090537);
    let b: vec3f = v * (vec3f(0.983729) * v + vec3f(0.4329510)) + vec3f(0.238081);
    return a / b;
}

fn toneMap(color: vec3f) -> vec3f {
    var c: vec3f = color * (uniform.exposure / 0.6);
    c = c * ACESInputMat;

    // Apply RRT and ODT
    c = RRTAndODTFit(c);
    c = c * ACESOutputMat;

    // Clamp to [0, 1]
    return clamp(c, vec3f(0.0), vec3f(1.0));
}
`;

export { tonemappingAces2PS as default };