playcanvas

Version:
PlayCanvas WebGL game engine
42 lines (32 loc) • 917 B
JavaScript
var tonemappingAces2PS = /* glsl */ `
uniform float exposure;

// ACES approximation by Stephen Hill

// sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT
const mat3 ACESInputMat = mat3(
    0.59719, 0.35458, 0.04823,
    0.07600, 0.90834, 0.01566,
    0.02840, 0.13383, 0.83777
);

// ODT_SAT => XYZ => D60_2_D65 => sRGB
const mat3 ACESOutputMat = mat3(
     1.60475, -0.53108, -0.07367,
    -0.10208,  1.10813, -0.00605,
    -0.00327, -0.07276,  1.07602
);

vec3 RRTAndODTFit(vec3 v) {
    vec3 a = v * (v + 0.0245786) - 0.000090537;
    vec3 b = v * (0.983729 * v + 0.4329510) + 0.238081;
    return a / b;
}

vec3 toneMap(vec3 color) {
    color *= exposure / 0.6;
    color = color * ACESInputMat;

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

    // Clamp to [0, 1]
    color = clamp(color, 0.0, 1.0);

    return color;
}
`;

export { tonemappingAces2PS as default };