62 lines
207 KiB
JavaScript
62 lines
207 KiB
JavaScript
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/**
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* Uniforms library for RectAreaLight shared webgl shaders
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* @author abelnation
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*
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* NOTE: This is a temporary location for the BRDF approximation texture data
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* based off of Eric Heitz's work (see citation below). BRDF data for
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* RectAreaLight is currently approximated using a precomputed texture
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* of roughly 80kb in size. The hope is to find a better way to include
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* the large texture data before including the full RectAreaLight implementation
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* in the main build files.
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*
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* TODO: figure out a way to compress the LTC BRDF data
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* TODO: validate the RectAreaLight BRDF and shaders
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*/
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// Precomputed values for linearly transformed cosines
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// Taken from "Real-Time Polygonal-Light Shading with Linearly Transformed Cosines"
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// By Eric Heitz, Jonathan Dupuy, Stephen Hill and David Neubelt
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// https://eheitzresearch.wordpress.com/415-2/
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( function () {
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// source: http://blog.selfshadow.com/sandbox/js/ltc_tables.js
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var LTC_MAT = [ 0.000200, -0.000000, 1.000000, -0.000000, 0.000504, -0.000000, 1.000000, -0.000000, 0.002016, -0.000000, 1.000000, -0.000000, 0.004535, -0.000000, 1.000000, -0.000000, 0.008063, -0.000000, 1.000000, -0.000000, 0.012598, -0.000000, 1.000000, -0.000000, 0.018141, -0.000000, 1.000000, -0.000000, 0.024692, -0.000000, 1.000000, -0.000000, 0.032252, -0.000000, 1.000000, -0.000000, 0.040821, -0.000000, 1.000000, -0.000000, 0.050400, -0.000000, 1.000000, -0.000000, 0.060989, -0.000000, 1.000000, -0.000000, 0.072591, -0.000000, 1.000000, -0.000000, 0.085206, -0.000000, 1.000000, -0.000000, 0.098836, -0.000000, 1.000000, -0.000000, 0.113483, -0.000000, 1.000000, -0.000000, 0.129147, -0.000000, 1.000000, -0.000000, 0.145828, -0.000000, 1.000000, -0.000000, 0.163499, -0.000000, 1.000000, -0.000000, 0.181972, -0.000000, 1.000000, -0.000000, 0.199498, -0.000000, 1.000000, -0.000000, 0.220031, -0.000000, 1.000000, -0.000000, 0.241588, -0.000000, 1.000000, -0.000000, 0.264120, -0.000000, 1.000000, -0.000000, 0.287521, -0.000000, 1.000000, -0.000000, 0.311478, -0.000000, 1.000000, -0.000000, 0.335127, -0.000000, 1.000000, -0.000000, 0.359811, -0.000000, 1.000000, -0.000000, 0.386446, -0.000000, 1.000000, -0.000000, 0.413161, -0.000000, 1.000000, -0.000000, 0.439142, -0.000000, 1.000000, -0.000000, 0.467039, -0.000000, 1.000000, -0.000000, 0.495170, -0.000000, 1.000000, -0.000000, 0.522324, -0.000000, 1.000000, -0.000000, 0.551482, -0.000000, 1.000000, -0.000000, 0.579621, -0.000000, 1.000000, -0.000000, 0.608255, -0.000000, 1.000000, -0.000000, 0.636515, -0.000000, 1.000000, -0.000000, 0.664835, -0.000000, 1.000000, -0.000000, 0.692549, -0.000000, 1.000000, -0.000000, 0.720375, -0.000000, 1.000000, -0.000000, 0.747238, -0.000000, 1.000000, -0.000000, 0.773956, -0.000000, 1.000000, -0.000000, 0.799879, -0.000000, 1.000000, -0.000000, 0.824889, -0.000000, 1.000000, -0.000000, 0.849357, -0.000000, 1.000000, -0.000000, 0.873016, -0.000000, 1.000000, -0.000000, 0.895670, -0.000000, 1.000000, -0.000000, 0.917194, -0.000000, 1.000000, -0.000000, 0.937978, -0.000000, 1.000000, -0.000000, 0.957872, -0.000000, 1.000000, -0.000000, 0.976736, -0.000000, 1.000000, -0.000000, 0.994433, -0.000000, 1.000000, -0.000000, 1.011206, -0.000000, 1.000000, -0.000000, 1.026820, -0.000000, 1.000000, -0.000000, 1.041720, -0.000000, 1.000000, -0.000000, 1.055657, -0.000000, 1.000000, -0.000000, 1.068642, -0.000000, 1.000000, -0.000000, 1.080646, -0.000000, 1.000000, -0.000000, 1.091637, -0.000000, 1.000000, -0.000000, 1.101837, -0.000000, 1.000000, -0.000000, 1.111292, -0.000000, 1.000000, -0.000000, 1.120025, -0.000000, 1.000000, -0.000000, 1.127918, -0.000000, 1.000000, -0.000000, 0.000200, -0.000005, 1.000623, 0.024938, 0.000504, -0.000013, 1.000643, 0.024938, 0.002016, -0.000050, 1.000618, 0.024938, 0.004535, -0.000113, 1.000621, 0.024938, 0.008063, -0.000201, 1.000746, 0.024938, 0.012596, -0.000314, 1.000463, 0.024937, 0.018140, -0.000452, 1.000511, 0.024939, 0.024693, -0.000616, 1.000541, 0.024938, 0.032253, -0.000804, 1.000684, 0.024938, 0.040815, -0.001018, 1.000524, 0.024940, 0.050399, -0.001257, 1.000582, 0.024937, 0.060989, -0.001521, 1.000655, 0.024937, 0.072591, -0.001810, 1.000608, 0.024938, 0.085204, -0.002125, 1.000622, 0.024939, 0.098835, -0.002465, 1.000632, 0.024937, 0.113483, -0.002830, 1.000640, 0.024939, 0.129143, -0.003220, 1.000568, 0.024938, 0.145830, -0.003633, 1.000635, 0.024938, 0.163497, -0.004062, 1.000626, 0.024938, 0.181956, -0.004424, 1.000612, 0.024924, 0.199791, -0.004593, 1.000627, 0.024890, 0.220029, -0.005480, 1.000594, 0.024935, 0.241586, -0.006010, 1.000616, 0.024933, 0.264115, -0.006550, 1.000607, 0.024927, 0.287514, -0.007072, 1.000595, 0.024909, 0.311455, -0.007472, 1.000616, 0.024872, 0.335083, -0.007491, 1.000589, 0.024755, 0.359805, -0.008810, 1.000601, 0.024877, 0.386438, -0.009282, 1.000640, 0.024824, 0.413131, -0.009534, 1.000599, 0.024708, 0.439249, -0.009701, 1.000497, 0.024573, 0.466997, -0.010878, 1.000467, 0.024652, 0.495138, -0.010959, 1.000539, 0.024455, 0.522654, -0.011386, 1.000518, 0.0243
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var LTC_MAG = [ 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 0.999995, 0.999990, 0.999971, 0.999937, 0.999853, 0.999670, 0.999138, 0.996746, 0.979578, 0.979309, 0.978836, 0.977972, 0.976223, 0.972205, 0.962466, 0.953919, 0.949829, 0.942492, 0.929870, 0.921319, 0.911112, 0.896015, 0.885105, 0.869971, 0.855017, 0.838328, 0.821241, 0.802352, 0.783873, 0.763309, 0.743058, 0.721929, 0.699755, 0.677721, 0.655456, 0.632681, 0.609629, 0.586831, 0.564287, 0.541772, 0.519428, 0.497353, 0.475624, 0.454606, 0.434099, 0.414085, 0.394605, 0.375698, 0.357386, 0.339871, 0.323085, 0.306905, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 0.999999, 0.999999, 0.999998, 0.999995, 0.999990, 0.999980, 0.999959, 0.999923, 0.999842, 0.999660, 0.999119, 0.996613, 0.981824, 0.979298, 0.978826, 0.977957, 0.976184, 0.972091, 0.962188, 0.953875, 0.949746, 0.942335, 0.930166, 0.921211, 0.910927, 0.896979, 0.884940, 0.869864, 0.854835, 0.838200, 0.821049, 0.802552, 0.783659, 0.763512, 0.742927, 0.721715, 0.699938, 0.677775, 0.655246, 0.632555, 0.609805, 0.586996, 0.564225, 0.541606, 0.519346, 0.497419, 0.475863, 0.454738, 0.434099, 0.414003, 0.394547, 0.375747, 0.357564, 0.340012, 0.323099, 0.306861, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 0.999999, 0.999998, 0.999995, 0.999991, 0.999979, 0.999959, 0.999917, 0.999839, 0.999648, 0.999074, 0.996168, 0.983770, 0.979279, 0.978800, 0.977905, 0.976058, 0.971727, 0.962120, 0.953901, 0.949485, 0.941859, 0.930911, 0.920853, 0.910394, 0.897600, 0.884427, 0.870101, 0.854522, 0.838325, 0.820754, 0.802707, 0.783223, 0.763605, 0.742872, 0.721565, 0.699935, 0.677726, 0.655242, 0.632580, 0.609766, 0.586946, 0.564275, 0.541759, 0.519467, 0.497478, 0.475886, 0.454794, 0.434233, 0.414207, 0.394751, 0.375892, 0.357683, 0.340146, 0.323287, 0.307095, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 0.999999, 0.999999, 0.999998, 0.999996, 0.999992, 0.999987, 0.999975, 0.999953, 0.999913, 0.999830, 0.999630, 0.998993, 0.995279, 0.985142, 0.979252, 0.978754, 0.977821, 0.975838, 0.971088, 0.962563, 0.954785, 0.949048, 0.941052, 0.931420, 0.920812, 0.909750, 0.897867, 0.883856, 0.870091, 0.854353, 0.838166, 0.820661, 0.802465, 0.783308, 0.763346, 0.742734, 0.721608, 0.699747, 0.677626, 0.655245, 0.632547, 0.609793, 0.587044, 0.564340, 0.541779, 0.519529, 0.497633, 0.476114, 0.455030, 0.434430, 0.414406, 0.394974, 0.376154, 0.357979, 0.340443, 0.323572, 0.307379, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 0.999998, 0.999998, 0.999996, 0.999991, 0.999984, 0.999970, 0.999946, 0.999905, 0.999815, 0.999599, 0.998856, 0.993704, 0.986135, 0.979212, 0.978690, 0.977691, 0.975504, 0.970133, 0.962951, 0.955649, 0.948405, 0.940418, 0.931660, 0.920881, 0.909376, 0.897785, 0.883844, 0.869756, 0.854326, 0.837732, 0.820617, 0.802053, 0.783195, 0.763119, 0.742610, 0.721344, 0.699709, 0.677624, 0.655114, 0.632523, 0.609812, 0.587052, 0.564417, 0.541966, 0.519751, 0.497824, 0.476309, 0.455271, 0.434735, 0.414736, 0.395317, 0.376524, 0.358364, 0.340852, 0.323988, 0.307786, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 0.999999, 0.999999, 0.999997, 0.999996, 0.999994, 0.999989, 0.999980, 0.999965, 0.999940, 0.999895, 0.999796, 0.999559, 0.998638, 0.992774, 0.986878, 0.980297, 0.978602, 0.977514, 0.975026, 0.969169, 0.963214, 0.956267, 0.947689, 0.940054, 0.931637, 0.920678, 0.908990, 0.897349, 0.883905, 0.869139, 0.854177, 0.837476, 0.820295, 0.801977, 0.782798, 0.762978, 0.742418, 0.721193, 0.699560, 0.677402, 0.655108, 0.632543, 0.609804, 0.587158, 0.564557, 0.542096, 0.519908, 0.498088, 0.476632, 0.455623, 0.435104, 0.415161, 0.395783, 0.377005, 0.358843, 0.341345, 0.324529, 0.308355, 1.000000, 1.000000, 1.000000, 1.000000, 1.000000, 0.999999, 0.999999, 0.999998, 0.999997, 0.999992, 0.999991, 0.999985, 0.999977, 0.999959, 0.999935, 0.999878, 0.999773, 0.999505, 0.998284, 0.992353, 0.987457, 0.981665, 0.978492, 0.977277
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//
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var UniformsLib = THREE.UniformsLib;
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var ShaderLib = THREE.ShaderLib;
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var LTC_MAT_TEXTURE = new THREE.DataTexture(
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new Float32Array( LTC_MAT ),
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64, 64, THREE.RGBAFormat, THREE.FloatType,
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THREE.UVMapping,
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THREE.ClampToEdgeWrapping, THREE.ClampToEdgeWrapping,
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THREE.LinearFilter, THREE.NearestFilter, 1 );
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var LTC_MAG_TEXTURE = new THREE.DataTexture(
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new Float32Array( LTC_MAG ),
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64, 64, THREE.AlphaFormat, THREE.FloatType,
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THREE.UVMapping,
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THREE.ClampToEdgeWrapping, THREE.ClampToEdgeWrapping,
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THREE.LinearFilter, THREE.NearestFilter, 1 );
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LTC_MAT_TEXTURE.needsUpdate = true;
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LTC_MAG_TEXTURE.needsUpdate = true;
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THREE.UniformsLib.LTC_MAT_TEXTURE = LTC_MAT_TEXTURE;
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THREE.UniformsLib.LTC_MAG_TEXTURE = LTC_MAG_TEXTURE;
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// Add ltc tables to materials
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var ltc_brdf = { ltcMat: { value: null }, ltcMag: { value: null } };
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Object.assign( ShaderLib.phong.uniforms, ltc_brdf );
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Object.assign( ShaderLib.standard.uniforms, ltc_brdf );
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Object.assign( ShaderLib.physical.uniforms, ltc_brdf );
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} )()
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