declare const _default: "\n// Missing Deadlines (Benjamin Wrensch): https://iolite-engine.com/blog_posts/minimal_agx_implementation\n// Filament: https://github.com/google/filament/blob/main/filament/src/ToneMapper.cpp#L263\n// https://github.com/EaryChow/AgX_LUT_Gen/blob/main/AgXBaseRec2020.py\n\n// Three.js: https://github.com/mrdoob/three.js/blob/4993e3af579a27cec950401b523b6e796eab93ec/src/renderers/shaders/ShaderChunk/tonemapping_pars_fragment.glsl.js#L79-L89\n// Matrices for rec 2020 <> rec 709 color space conversion\n// matrix provided in row-major order so it has been transposed\n// https://www.itu.int/pub/R-REP-BT.2407-2017\nconst mat3 LINEAR_REC2020_TO_LINEAR_SRGB = mat3(\n  1.6605, -0.1246, -0.0182,\n  -0.5876, 1.1329, -0.1006,\n  -0.0728, -0.0083, 1.1187\n);\n\nconst mat3 LINEAR_SRGB_TO_LINEAR_REC2020 = mat3(\n  0.6274, 0.0691, 0.0164,\n  0.3293, 0.9195, 0.0880,\n  0.0433, 0.0113, 0.8956\n);\n\n// Converted to column major from blender: https://github.com/blender/blender/blob/fc08f7491e7eba994d86b610e5ec757f9c62ac81/release/datafiles/colormanagement/config.ocio#L358\nconst mat3 AgXInsetMatrix = mat3(\n  0.856627153315983, 0.137318972929847, 0.11189821299995,\n  0.0951212405381588, 0.761241990602591, 0.0767994186031903,\n  0.0482516061458583, 0.101439036467562, 0.811302368396859\n);\n\n// Converted to column major and inverted from https://github.com/EaryChow/AgX_LUT_Gen/blob/ab7415eca3cbeb14fd55deb1de6d7b2d699a1bb9/AgXBaseRec2020.py#L25\n// https://github.com/google/filament/blob/bac8e58ee7009db4d348875d274daf4dd78a3bd1/filament/src/ToneMapper.cpp#L273-L278\nconst mat3 AgXOutsetMatrix = mat3(\n  1.1271005818144368, -0.1413297634984383, -0.14132976349843826,\n  -0.11060664309660323, 1.157823702216272, -0.11060664309660294,\n  -0.016493938717834573, -0.016493938717834257, 1.2519364065950405\n);\n\nconst float AgxMinEv = -12.47393;\nconst float AgxMaxEv = 4.026069;\n\n// Sample usage\nvec3 agxCdl(vec3 color, vec3 slope, vec3 offset, vec3 power, float saturation) {\n  color = LINEAR_SRGB_TO_LINEAR_REC2020 * color; // From three.js\n\n  // 1. agx()\n  // Input transform (inset)\n  color = AgXInsetMatrix * color;\n\n  color = max(color, 1e-10); // From Filament: avoid 0 or negative numbers for log2\n\n  // Log2 space encoding\n  color = clamp(log2(color), AgxMinEv, AgxMaxEv);\n  color = (color - AgxMinEv) / (AgxMaxEv - AgxMinEv);\n\n  color = clamp(color, 0.0, 1.0); // From Filament\n\n  // Apply sigmoid function approximation\n  // Mean error^2: 3.6705141e-06\n  vec3 x2 = color * color;\n  vec3 x4 = x2 * x2;\n  color = + 15.5     * x4 * x2\n          - 40.14    * x4 * color\n          + 31.96    * x4\n          - 6.868    * x2 * color\n          + 0.4298   * x2\n          + 0.1191   * color\n          - 0.00232;\n\n  // 2. agxLook()\n  color = pow(color * slope + offset, power);\n  const vec3 lw = vec3(0.2126, 0.7152, 0.0722);\n  float luma = dot(color, lw);\n  color = luma + saturation * (color - luma);\n\n  // 3. agxEotf()\n  // Inverse input transform (outset)\n  color = AgXOutsetMatrix * color;\n\n  // sRGB IEC 61966-2-1 2.2 Exponent Reference EOTF Display\n  // NOTE: We're linearizing the output here. Comment/adjust when\n  // *not* using a sRGB render target\n  color = pow(max(vec3(0.0), color), vec3(2.2)); // From filament: max()\n\n  color = LINEAR_REC2020_TO_LINEAR_SRGB * color; // From three.js\n  // Gamut mapping. Simple clamp for now.\n\tcolor = clamp(color, 0.0, 1.0);\n\n  return color;\n}\n\nvec3 agx(vec3 color) {\n  return agxCdl(color, vec3(1.0), vec3(0.0), vec3(1.0), 1.0);\n}\n\nvec3 agxGolden(vec3 color) {\n  return agxCdl(color, vec3(1.0, 0.9, 0.5), vec3(0.0), vec3(0.8), 1.3);\n}\n\nvec3 agxPunchy(vec3 color) {\n  return agxCdl(color, vec3(1.0), vec3(0.0), vec3(1.35), 1.4);\n}\n";
export default _default;