/*
 * ACES tone mapping
 * From 'Baking Lab' by MJP and David Neubelt
 * Original by Stephen Hill
 * https://github.com/TheRealMJP/BakingLab/blob/master/BakingLab/ACES.hlsl
 * Licensed under the MIT license
 */

#version 330 core

// sRGB => XYZ => D65_2_D60 => AP1 => RRT_SAT
const mat3 ACESInputMat = mat3(
    0.59719, 0.07600, 0.02840,
    0.35458, 0.90834, 0.13383,
    0.04823, 0.01566, 0.83777);
// ODT_SAT => XYZ => D60_2_D65 => sRGB
const mat3 ACESOutputMat = mat3(
     1.60475, -0.10208, -0.00327,
    -0.53108,  1.10813, -0.07276,
    -0.07367, -0.00605,  1.07602);

vec3 aces_fitted(vec3 color)
{
    vec3 v = ACESInputMat * color;
    vec3 a = v * (v + 0.0245786) - 0.000090537;
    vec3 b = v * (0.983729 * v + 0.4329510) + 0.238081;
    return clamp(ACESOutputMat * (a / b), 0.0, 1.0);
}