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spectrum.cc

#include <yafraycore/spectrum.h>

__BEGIN_YAFRAY

// CIE color matching function table, 1931, 2 degree
static CFLOAT CIE_XYZcolmat[471][4] = {
{360, 0.000129900000, 0.000003917000, 0.000606100000}, {361, 0.000145847000, 0.000004393581, 0.000680879200},
{362, 0.000163802100, 0.000004929604, 0.000765145600}, {363, 0.000184003700, 0.000005532136, 0.000860012400},
{364, 0.000206690200, 0.000006208245, 0.000966592800}, {365, 0.000232100000, 0.000006965000, 0.001086000000},
{366, 0.000260728000, 0.000007813219, 0.001220586000}, {367, 0.000293075000, 0.000008767336, 0.001372729000},
{368, 0.000329388000, 0.000009839844, 0.001543579000}, {369, 0.000369914000, 0.000011043230, 0.001734286000},
{370, 0.000414900000, 0.000012390000, 0.001946000000}, {371, 0.000464158700, 0.000013886410, 0.002177777000},
{372, 0.000518986000, 0.000015557280, 0.002435809000}, {373, 0.000581854000, 0.000017442960, 0.002731953000},
{374, 0.000655234700, 0.000019583750, 0.003078064000}, {375, 0.000741600000, 0.000022020000, 0.003486000000},
{376, 0.000845029600, 0.000024839650, 0.003975227000}, {377, 0.000964526800, 0.000028041260, 0.004540880000},
{378, 0.001094949000, 0.000031531040, 0.005158320000}, {379, 0.001231154000, 0.000035215210, 0.005802907000},
{380, 0.001368000000, 0.000039000000, 0.006450001000}, {381, 0.001502050000, 0.000042826400, 0.007083216000},
{382, 0.001642328000, 0.000046914600, 0.007745488000}, {383, 0.001802382000, 0.000051589600, 0.008501152000},
{384, 0.001995757000, 0.000057176400, 0.009414544000}, {385, 0.002236000000, 0.000064000000, 0.010549990000},
{386, 0.002535385000, 0.000072344210, 0.011965800000}, {387, 0.002892603000, 0.000082212240, 0.013655870000},
{388, 0.003300829000, 0.000093508160, 0.015588050000}, {389, 0.003753236000, 0.000106136100, 0.017730150000},
{390, 0.004243000000, 0.000120000000, 0.020050010000}, {391, 0.004762389000, 0.000134984000, 0.022511360000},
{392, 0.005330048000, 0.000151492000, 0.025202880000}, {393, 0.005978712000, 0.000170208000, 0.028279720000},
{394, 0.006741117000, 0.000191816000, 0.031897040000}, {395, 0.007650000000, 0.000217000000, 0.036210000000},
{396, 0.008751373000, 0.000246906700, 0.041437710000}, {397, 0.010028880000, 0.000281240000, 0.047503720000},
{398, 0.011421700000, 0.000318520000, 0.054119880000}, {399, 0.012869010000, 0.000357266700, 0.060998030000},
{400, 0.014310000000, 0.000396000000, 0.067850010000}, {401, 0.015704430000, 0.000433714700, 0.074486320000},
{402, 0.017147440000, 0.000473024000, 0.081361560000}, {403, 0.018781220000, 0.000517876000, 0.089153640000},
{404, 0.020748010000, 0.000572218700, 0.098540480000}, {405, 0.023190000000, 0.000640000000, 0.110200000000},
{406, 0.026207360000, 0.000724560000, 0.124613300000}, {407, 0.029782480000, 0.000825500000, 0.141701700000},
{408, 0.033880920000, 0.000941160000, 0.161303500000}, {409, 0.038468240000, 0.001069880000, 0.183256800000},
{410, 0.043510000000, 0.001210000000, 0.207400000000}, {411, 0.048995600000, 0.001362091000, 0.233692100000},
{412, 0.055022600000, 0.001530752000, 0.262611400000}, {413, 0.061718800000, 0.001720368000, 0.294774600000},
{414, 0.069212000000, 0.001935323000, 0.330798500000}, {415, 0.077630000000, 0.002180000000, 0.371300000000},
{416, 0.086958110000, 0.002454800000, 0.416209100000}, {417, 0.097176720000, 0.002764000000, 0.465464200000},
{418, 0.108406300000, 0.003117800000, 0.519694800000}, {419, 0.120767200000, 0.003526400000, 0.579530300000},
{420, 0.134380000000, 0.004000000000, 0.645600000000}, {421, 0.149358200000, 0.004546240000, 0.718483800000},
{422, 0.165395700000, 0.005159320000, 0.796713300000}, {423, 0.181983100000, 0.005829280000, 0.877845900000},
{424, 0.198611000000, 0.006546160000, 0.959439000000}, {425, 0.214770000000, 0.007300000000, 1.039050100000},
{426, 0.230186800000, 0.008086507000, 1.115367300000}, {427, 0.244879700000, 0.008908720000, 1.188497100000},
{428, 0.258777300000, 0.009767680000, 1.258123300000}, {429, 0.271807900000, 0.010664430000, 1.323929600000},
{430, 0.283900000000, 0.011600000000, 1.385600000000}, {431, 0.294943800000, 0.012573170000, 1.442635200000},
{432, 0.304896500000, 0.013582720000, 1.494803500000}, {433, 0.313787300000, 0.014629680000, 1.542190300000},
{434, 0.321645400000, 0.015715090000, 1.584880700000}, {435, 0.328500000000, 0.016840000000, 1.622960000000},
{436, 0.334351300000, 0.018007360000, 1.656404800000}, {437, 0.339210100000, 0.019214480000, 1.685295900000},
{438, 0.343121300000, 0.020453920000, 1.709874500000}, {439, 0.346129600000, 0.021718240000, 1.730382100000},
{440, 0.348280000000, 0.023000000000, 1.747060000000}, {441, 0.349599900000, 0.024294610000, 1.760044600000},
{442, 0.350147400000, 0.025610240000, 1.769623300000}, {443, 0.350013000000, 0.026958570000, 1.776263700000},
{444, 0.349287000000, 0.028351250000, 1.780433400000}, {445, 0.348060000000, 0.029800000000, 1.782600000000},
{446, 0.346373300000, 0.031310830000, 1.782968200000}, {447, 0.344262400000, 0.032883680000, 1.781699800000},
{448, 0.341808800000, 0.034521120000, 1.779198200000}, {449, 0.339094100000, 0.036225710000, 1.775867100000},
{450, 0.336200000000, 0.038000000000, 1.772110000000}, {451, 0.333197700000, 0.039846670000, 1.768258900000},
{452, 0.330041100000, 0.041768000000, 1.764039000000}, {453, 0.326635700000, 0.043766000000, 1.758943800000},
{454, 0.322886800000, 0.045842670000, 1.752466300000}, {455, 0.318700000000, 0.048000000000, 1.744100000000},
{456, 0.314025100000, 0.050243680000, 1.733559500000}, {457, 0.308884000000, 0.052573040000, 1.720858100000},
{458, 0.303290400000, 0.054980560000, 1.705936900000}, {459, 0.297257900000, 0.057458720000, 1.688737200000},
{460, 0.290800000000, 0.060000000000, 1.669200000000}, {461, 0.283970100000, 0.062601970000, 1.647528700000},
{462, 0.276721400000, 0.065277520000, 1.623412700000}, {463, 0.268917800000, 0.068042080000, 1.596022300000},
{464, 0.260422700000, 0.070911090000, 1.564528000000}, {465, 0.251100000000, 0.073900000000, 1.528100000000},
{466, 0.240847500000, 0.077016000000, 1.486111400000}, {467, 0.229851200000, 0.080266400000, 1.439521500000},
{468, 0.218407200000, 0.083666800000, 1.389879900000}, {469, 0.206811500000, 0.087232800000, 1.338736200000},
{470, 0.195360000000, 0.090980000000, 1.287640000000}, {471, 0.184213600000, 0.094917550000, 1.237422300000},
{472, 0.173327300000, 0.099045840000, 1.187824300000}, {473, 0.162688100000, 0.103367400000, 1.138761100000},
{474, 0.152283300000, 0.107884600000, 1.090148000000}, {475, 0.142100000000, 0.112600000000, 1.041900000000},
{476, 0.132178600000, 0.117532000000, 0.994197600000}, {477, 0.122569600000, 0.122674400000, 0.947347300000},
{478, 0.113275200000, 0.127992800000, 0.901453100000}, {479, 0.104297900000, 0.133452800000, 0.856619300000},
{480, 0.095640000000, 0.139020000000, 0.812950100000}, {481, 0.087299550000, 0.144676400000, 0.770517300000},
{482, 0.079308040000, 0.150469300000, 0.729444800000}, {483, 0.071717760000, 0.156461900000, 0.689913600000},
{484, 0.064580990000, 0.162717700000, 0.652104900000}, {485, 0.057950010000, 0.169300000000, 0.616200000000},
{486, 0.051862110000, 0.176243100000, 0.582328600000}, {487, 0.046281520000, 0.183558100000, 0.550416200000},
{488, 0.041150880000, 0.191273500000, 0.520337600000}, {489, 0.036412830000, 0.199418000000, 0.491967300000},
{490, 0.032010000000, 0.208020000000, 0.465180000000}, {491, 0.027917200000, 0.217119900000, 0.439924600000},
{492, 0.024144400000, 0.226734500000, 0.416183600000}, {493, 0.020687000000, 0.236857100000, 0.393882200000},
{494, 0.017540400000, 0.247481200000, 0.372945900000}, {495, 0.014700000000, 0.258600000000, 0.353300000000},
{496, 0.012161790000, 0.270184900000, 0.334857800000}, {497, 0.009919960000, 0.282293900000, 0.317552100000},
{498, 0.007967240000, 0.295050500000, 0.301337500000}, {499, 0.006296346000, 0.308578000000, 0.286168600000},
{500, 0.004900000000, 0.323000000000, 0.272000000000}, {501, 0.003777173000, 0.338402100000, 0.258817100000},
{502, 0.002945320000, 0.354685800000, 0.246483800000}, {503, 0.002424880000, 0.371698600000, 0.234771800000},
{504, 0.002236293000, 0.389287500000, 0.223453300000}, {505, 0.002400000000, 0.407300000000, 0.212300000000},
{506, 0.002925520000, 0.425629900000, 0.201169200000}, {507, 0.003836560000, 0.444309600000, 0.190119600000},
{508, 0.005174840000, 0.463394400000, 0.179225400000}, {509, 0.006982080000, 0.482939500000, 0.168560800000},
{510, 0.009300000000, 0.503000000000, 0.158200000000}, {511, 0.012149490000, 0.523569300000, 0.148138300000},
{512, 0.015535880000, 0.544512000000, 0.138375800000}, {513, 0.019477520000, 0.565690000000, 0.128994200000},
{514, 0.023992770000, 0.586965300000, 0.120075100000}, {515, 0.029100000000, 0.608200000000, 0.111700000000},
{516, 0.034814850000, 0.629345600000, 0.103904800000}, {517, 0.041120160000, 0.650306800000, 0.096667480000},
{518, 0.047985040000, 0.670875200000, 0.089982720000}, {519, 0.055378610000, 0.690842400000, 0.083845310000},
{520, 0.063270000000, 0.710000000000, 0.078249990000}, {521, 0.071635010000, 0.728185200000, 0.073208990000},
{522, 0.080462240000, 0.745463600000, 0.068678160000}, {523, 0.089739960000, 0.761969400000, 0.064567840000},
{524, 0.099456450000, 0.777836800000, 0.060788350000}, {525, 0.109600000000, 0.793200000000, 0.057250010000},
{526, 0.120167400000, 0.808110400000, 0.053904350000}, {527, 0.131114500000, 0.822496200000, 0.050746640000},
{528, 0.142367900000, 0.836306800000, 0.047752760000}, {529, 0.153854200000, 0.849491600000, 0.044898590000},
{530, 0.165500000000, 0.862000000000, 0.042160000000}, {531, 0.177257100000, 0.873810800000, 0.039507280000},
{532, 0.189140000000, 0.884962400000, 0.036935640000}, {533, 0.201169400000, 0.895493600000, 0.034458360000},
{534, 0.213365800000, 0.905443200000, 0.032088720000}, {535, 0.225749900000, 0.914850100000, 0.029840000000},
{536, 0.238320900000, 0.923734800000, 0.027711810000}, {537, 0.251066800000, 0.932092400000, 0.025694440000},
{538, 0.263992200000, 0.939922600000, 0.023787160000}, {539, 0.277101700000, 0.947225200000, 0.021989250000},
{540, 0.290400000000, 0.954000000000, 0.020300000000}, {541, 0.303891200000, 0.960256100000, 0.018718050000},
{542, 0.317572600000, 0.966007400000, 0.017240360000}, {543, 0.331438400000, 0.971260600000, 0.015863640000},
{544, 0.345482800000, 0.976022500000, 0.014584610000}, {545, 0.359700000000, 0.980300000000, 0.013400000000},
{546, 0.374083900000, 0.984092400000, 0.012307230000}, {547, 0.388639600000, 0.987418200000, 0.011301880000},
{548, 0.403378400000, 0.990312800000, 0.010377920000}, {549, 0.418311500000, 0.992811600000, 0.009529306000},
{550, 0.433449900000, 0.994950100000, 0.008749999000}, {551, 0.448795300000, 0.996710800000, 0.008035200000},
{552, 0.464336000000, 0.998098300000, 0.007381600000}, {553, 0.480064000000, 0.999112000000, 0.006785400000},
{554, 0.495971300000, 0.999748200000, 0.006242800000}, {555, 0.512050100000, 1.000000000000, 0.005749999000},
{556, 0.528295900000, 0.999856700000, 0.005303600000}, {557, 0.544691600000, 0.999304600000, 0.004899800000},
{558, 0.561209400000, 0.998325500000, 0.004534200000}, {559, 0.577821500000, 0.996898700000, 0.004202400000},
{560, 0.594500000000, 0.995000000000, 0.003900000000}, {561, 0.611220900000, 0.992600500000, 0.003623200000},
{562, 0.627975800000, 0.989742600000, 0.003370600000}, {563, 0.644760200000, 0.986444400000, 0.003141400000},
{564, 0.661569700000, 0.982724100000, 0.002934800000}, {565, 0.678400000000, 0.978600000000, 0.002749999000},
{566, 0.695239200000, 0.974083700000, 0.002585200000}, {567, 0.712058600000, 0.969171200000, 0.002438600000},
{568, 0.728828400000, 0.963856800000, 0.002309400000}, {569, 0.745518800000, 0.958134900000, 0.002196800000},
{570, 0.762100000000, 0.952000000000, 0.002100000000}, {571, 0.778543200000, 0.945450400000, 0.002017733000},
{572, 0.794825600000, 0.938499200000, 0.001948200000}, {573, 0.810926400000, 0.931162800000, 0.001889800000},
{574, 0.826824800000, 0.923457600000, 0.001840933000}, {575, 0.842500000000, 0.915400000000, 0.001800000000},
{576, 0.857932500000, 0.907006400000, 0.001766267000}, {577, 0.873081600000, 0.898277200000, 0.001737800000},
{578, 0.887894400000, 0.889204800000, 0.001711200000}, {579, 0.902318100000, 0.879781600000, 0.001683067000},
{580, 0.916300000000, 0.870000000000, 0.001650001000}, {581, 0.929799500000, 0.859861300000, 0.001610133000},
{582, 0.942798400000, 0.849392000000, 0.001564400000}, {583, 0.955277600000, 0.838622000000, 0.001513600000},
{584, 0.967217900000, 0.827581300000, 0.001458533000}, {585, 0.978600000000, 0.816300000000, 0.001400000000},
{586, 0.989385600000, 0.804794700000, 0.001336667000}, {587, 0.999548800000, 0.793082000000, 0.001270000000},
{588, 1.009089200000, 0.781192000000, 0.001205000000}, {589, 1.018006400000, 0.769154700000, 0.001146667000},
{590, 1.026300000000, 0.757000000000, 0.001100000000}, {591, 1.033982700000, 0.744754100000, 0.001068800000},
{592, 1.040986000000, 0.732422400000, 0.001049400000}, {593, 1.047188000000, 0.720003600000, 0.001035600000},
{594, 1.052466700000, 0.707496500000, 0.001021200000}, {595, 1.056700000000, 0.694900000000, 0.001000000000},
{596, 1.059794400000, 0.682219200000, 0.000968640000}, {597, 1.061799200000, 0.669471600000, 0.000929920000},
{598, 1.062806800000, 0.656674400000, 0.000886880000}, {599, 1.062909600000, 0.643844800000, 0.000842560000},
{600, 1.062200000000, 0.631000000000, 0.000800000000}, {601, 1.060735200000, 0.618155500000, 0.000760960000},
{602, 1.058443600000, 0.605314400000, 0.000723680000}, {603, 1.055224400000, 0.592475600000, 0.000685920000},
{604, 1.050976800000, 0.579637900000, 0.000645440000}, {605, 1.045600000000, 0.566800000000, 0.000600000000},
{606, 1.039036900000, 0.553961100000, 0.000547866700}, {607, 1.031360800000, 0.541137200000, 0.000491600000},
{608, 1.022666200000, 0.528352800000, 0.000435400000}, {609, 1.013047700000, 0.515632300000, 0.000383466700},
{610, 1.002600000000, 0.503000000000, 0.000340000000}, {611, 0.991367500000, 0.490468800000, 0.000307253300},
{612, 0.979331400000, 0.478030400000, 0.000283160000}, {613, 0.966491600000, 0.465677600000, 0.000265440000},
{614, 0.952847900000, 0.453403200000, 0.000251813300}, {615, 0.938400000000, 0.441200000000, 0.000240000000},
{616, 0.923194000000, 0.429080000000, 0.000229546700}, {617, 0.907244000000, 0.417036000000, 0.000220640000},
{618, 0.890502000000, 0.405032000000, 0.000211960000}, {619, 0.872920000000, 0.393032000000, 0.000202186700},
{620, 0.854449900000, 0.381000000000, 0.000190000000}, {621, 0.835084000000, 0.368918400000, 0.000174213300},
{622, 0.814946000000, 0.356827200000, 0.000155640000}, {623, 0.794186000000, 0.344776800000, 0.000135960000},
{624, 0.772954000000, 0.332817600000, 0.000116853300}, {625, 0.751400000000, 0.321000000000, 0.000100000000},
{626, 0.729583600000, 0.309338100000, 0.000086133330}, {627, 0.707588800000, 0.297850400000, 0.000074600000},
{628, 0.685602200000, 0.286593600000, 0.000065000000}, {629, 0.663810400000, 0.275624500000, 0.000056933330},
{630, 0.642400000000, 0.265000000000, 0.000049999990}, {631, 0.621514900000, 0.254763200000, 0.000044160000},
{632, 0.601113800000, 0.244889600000, 0.000039480000}, {633, 0.581105200000, 0.235334400000, 0.000035720000},
{634, 0.561397700000, 0.226052800000, 0.000032640000}, {635, 0.541900000000, 0.217000000000, 0.000030000000},
{636, 0.522599500000, 0.208161600000, 0.000027653330}, {637, 0.503546400000, 0.199548800000, 0.000025560000},
{638, 0.484743600000, 0.191155200000, 0.000023640000}, {639, 0.466193900000, 0.182974400000, 0.000021813330},
{640, 0.447900000000, 0.175000000000, 0.000020000000}, {641, 0.429861300000, 0.167223500000, 0.000018133330},
{642, 0.412098000000, 0.159646400000, 0.000016200000}, {643, 0.394644000000, 0.152277600000, 0.000014200000},
{644, 0.377533300000, 0.145125900000, 0.000012133330}, {645, 0.360800000000, 0.138200000000, 0.000010000000},
{646, 0.344456300000, 0.131500300000, 0.000007733333}, {647, 0.328516800000, 0.125024800000, 0.000005400000},
{648, 0.313019200000, 0.118779200000, 0.000003200000}, {649, 0.298001100000, 0.112769100000, 0.000001333333},
{650, 0.283500000000, 0.107000000000, 0.000000000000}, {651, 0.269544800000, 0.101476200000, 0.000000000000},
{652, 0.256118400000, 0.096188640000, 0.000000000000}, {653, 0.243189600000, 0.091122960000, 0.000000000000},
{654, 0.230727200000, 0.086264850000, 0.000000000000}, {655, 0.218700000000, 0.081600000000, 0.000000000000},
{656, 0.207097100000, 0.077120640000, 0.000000000000}, {657, 0.195923200000, 0.072825520000, 0.000000000000},
{658, 0.185170800000, 0.068710080000, 0.000000000000}, {659, 0.174832300000, 0.064769760000, 0.000000000000},
{660, 0.164900000000, 0.061000000000, 0.000000000000}, {661, 0.155366700000, 0.057396210000, 0.000000000000},
{662, 0.146230000000, 0.053955040000, 0.000000000000}, {663, 0.137490000000, 0.050673760000, 0.000000000000},
{664, 0.129146700000, 0.047549650000, 0.000000000000}, {665, 0.121200000000, 0.044580000000, 0.000000000000},
{666, 0.113639700000, 0.041758720000, 0.000000000000}, {667, 0.106465000000, 0.039084960000, 0.000000000000},
{668, 0.099690440000, 0.036563840000, 0.000000000000}, {669, 0.093330610000, 0.034200480000, 0.000000000000},
{670, 0.087400000000, 0.032000000000, 0.000000000000}, {671, 0.081900960000, 0.029962610000, 0.000000000000},
{672, 0.076804280000, 0.028076640000, 0.000000000000}, {673, 0.072077120000, 0.026329360000, 0.000000000000},
{674, 0.067686640000, 0.024708050000, 0.000000000000}, {675, 0.063600000000, 0.023200000000, 0.000000000000},
{676, 0.059806850000, 0.021800770000, 0.000000000000}, {677, 0.056282160000, 0.020501120000, 0.000000000000},
{678, 0.052971040000, 0.019281080000, 0.000000000000}, {679, 0.049818610000, 0.018120690000, 0.000000000000},
{680, 0.046770000000, 0.017000000000, 0.000000000000}, {681, 0.043784050000, 0.015903790000, 0.000000000000},
{682, 0.040875360000, 0.014837180000, 0.000000000000}, {683, 0.038072640000, 0.013810680000, 0.000000000000},
{684, 0.035404610000, 0.012834780000, 0.000000000000}, {685, 0.032900000000, 0.011920000000, 0.000000000000},
{686, 0.030564190000, 0.011068310000, 0.000000000000}, {687, 0.028380560000, 0.010273390000, 0.000000000000},
{688, 0.026344840000, 0.009533311000, 0.000000000000}, {689, 0.024452750000, 0.008846157000, 0.000000000000},
{690, 0.022700000000, 0.008210000000, 0.000000000000}, {691, 0.021084290000, 0.007623781000, 0.000000000000},
{692, 0.019599880000, 0.007085424000, 0.000000000000}, {693, 0.018237320000, 0.006591476000, 0.000000000000},
{694, 0.016987170000, 0.006138485000, 0.000000000000}, {695, 0.015840000000, 0.005723000000, 0.000000000000},
{696, 0.014790640000, 0.005343059000, 0.000000000000}, {697, 0.013831320000, 0.004995796000, 0.000000000000},
{698, 0.012948680000, 0.004676404000, 0.000000000000}, {699, 0.012129200000, 0.004380075000, 0.000000000000},
{700, 0.011359160000, 0.004102000000, 0.000000000000}, {701, 0.010629350000, 0.003838453000, 0.000000000000},
{702, 0.009938846000, 0.003589099000, 0.000000000000}, {703, 0.009288422000, 0.003354219000, 0.000000000000},
{704, 0.008678854000, 0.003134093000, 0.000000000000}, {705, 0.008110916000, 0.002929000000, 0.000000000000},
{706, 0.007582388000, 0.002738139000, 0.000000000000}, {707, 0.007088746000, 0.002559876000, 0.000000000000},
{708, 0.006627313000, 0.002393244000, 0.000000000000}, {709, 0.006195408000, 0.002237275000, 0.000000000000},
{710, 0.005790346000, 0.002091000000, 0.000000000000}, {711, 0.005409826000, 0.001953587000, 0.000000000000},
{712, 0.005052583000, 0.001824580000, 0.000000000000}, {713, 0.004717512000, 0.001703580000, 0.000000000000},
{714, 0.004403507000, 0.001590187000, 0.000000000000}, {715, 0.004109457000, 0.001484000000, 0.000000000000},
{716, 0.003833913000, 0.001384496000, 0.000000000000}, {717, 0.003575748000, 0.001291268000, 0.000000000000},
{718, 0.003334342000, 0.001204092000, 0.000000000000}, {719, 0.003109075000, 0.001122744000, 0.000000000000},
{720, 0.002899327000, 0.001047000000, 0.000000000000}, {721, 0.002704348000, 0.000976589600, 0.000000000000},
{722, 0.002523020000, 0.000911108800, 0.000000000000}, {723, 0.002354168000, 0.000850133200, 0.000000000000},
{724, 0.002196616000, 0.000793238400, 0.000000000000}, {725, 0.002049190000, 0.000740000000, 0.000000000000},
{726, 0.001910960000, 0.000690082700, 0.000000000000}, {727, 0.001781438000, 0.000643310000, 0.000000000000},
{728, 0.001660110000, 0.000599496000, 0.000000000000}, {729, 0.001546459000, 0.000558454700, 0.000000000000},
{730, 0.001439971000, 0.000520000000, 0.000000000000}, {731, 0.001340042000, 0.000483913600, 0.000000000000},
{732, 0.001246275000, 0.000450052800, 0.000000000000}, {733, 0.001158471000, 0.000418345200, 0.000000000000},
{734, 0.001076430000, 0.000388718400, 0.000000000000}, {735, 0.000999949300, 0.000361100000, 0.000000000000},
{736, 0.000928735800, 0.000335383500, 0.000000000000}, {737, 0.000862433200, 0.000311440400, 0.000000000000},
{738, 0.000800750300, 0.000289165600, 0.000000000000}, {739, 0.000743396000, 0.000268453900, 0.000000000000},
{740, 0.000690078600, 0.000249200000, 0.000000000000}, {741, 0.000640515600, 0.000231301900, 0.000000000000},
{742, 0.000594502100, 0.000214685600, 0.000000000000}, {743, 0.000551864600, 0.000199288400, 0.000000000000},
{744, 0.000512429000, 0.000185047500, 0.000000000000}, {745, 0.000476021300, 0.000171900000, 0.000000000000},
{746, 0.000442453600, 0.000159778100, 0.000000000000}, {747, 0.000411511700, 0.000148604400, 0.000000000000},
{748, 0.000382981400, 0.000138301600, 0.000000000000}, {749, 0.000356649100, 0.000128792500, 0.000000000000},
{750, 0.000332301100, 0.000120000000, 0.000000000000}, {751, 0.000309758600, 0.000111859500, 0.000000000000},
{752, 0.000288887100, 0.000104322400, 0.000000000000}, {753, 0.000269539400, 0.000097335600, 0.000000000000},
{754, 0.000251568200, 0.000090845870, 0.000000000000}, {755, 0.000234826100, 0.000084800000, 0.000000000000},
{756, 0.000219171000, 0.000079146670, 0.000000000000}, {757, 0.000204525800, 0.000073858000, 0.000000000000},
{758, 0.000190840500, 0.000068916000, 0.000000000000}, {759, 0.000178065400, 0.000064302670, 0.000000000000},
{760, 0.000166150500, 0.000060000000, 0.000000000000}, {761, 0.000155023600, 0.000055981870, 0.000000000000},
{762, 0.000144621900, 0.000052225600, 0.000000000000}, {763, 0.000134909800, 0.000048718400, 0.000000000000},
{764, 0.000125852000, 0.000045447470, 0.000000000000}, {765, 0.000117413000, 0.000042400000, 0.000000000000},
{766, 0.000109551500, 0.000039561040, 0.000000000000}, {767, 0.000102224500, 0.000036915120, 0.000000000000},
{768, 0.000095394450, 0.000034448680, 0.000000000000}, {769, 0.000089023900, 0.000032148160, 0.000000000000},
{770, 0.000083075270, 0.000030000000, 0.000000000000}, {771, 0.000077512690, 0.000027991250, 0.000000000000},
{772, 0.000072313040, 0.000026113560, 0.000000000000}, {773, 0.000067457780, 0.000024360240, 0.000000000000},
{774, 0.000062928440, 0.000022724610, 0.000000000000}, {775, 0.000058706520, 0.000021200000, 0.000000000000},
{776, 0.000054770280, 0.000019778550, 0.000000000000}, {777, 0.000051099180, 0.000018452850, 0.000000000000},
{778, 0.000047676540, 0.000017216870, 0.000000000000}, {779, 0.000044485670, 0.000016064590, 0.000000000000},
{780, 0.000041509940, 0.000014990000, 0.000000000000}, {781, 0.000038733240, 0.000013987280, 0.000000000000},
{782, 0.000036142030, 0.000013051550, 0.000000000000}, {783, 0.000033723520, 0.000012178180, 0.000000000000},
{784, 0.000031464870, 0.000011362540, 0.000000000000}, {785, 0.000029353260, 0.000010600000, 0.000000000000},
{786, 0.000027375730, 0.000009885877, 0.000000000000}, {787, 0.000025524330, 0.000009217304, 0.000000000000},
{788, 0.000023793760, 0.000008592362, 0.000000000000}, {789, 0.000022178700, 0.000008009133, 0.000000000000},
{790, 0.000020673830, 0.000007465700, 0.000000000000}, {791, 0.000019272260, 0.000006959567, 0.000000000000},
{792, 0.000017966400, 0.000006487995, 0.000000000000}, {793, 0.000016749910, 0.000006048699, 0.000000000000},
{794, 0.000015616480, 0.000005639396, 0.000000000000}, {795, 0.000014559770, 0.000005257800, 0.000000000000},
{796, 0.000013573870, 0.000004901771, 0.000000000000}, {797, 0.000012654360, 0.000004569720, 0.000000000000},
{798, 0.000011797230, 0.000004260194, 0.000000000000}, {799, 0.000010998440, 0.000003971739, 0.000000000000},
{800, 0.000010253980, 0.000003702900, 0.000000000000}, {801, 0.000009559646, 0.000003452163, 0.000000000000},
{802, 0.000008912044, 0.000003218302, 0.000000000000}, {803, 0.000008308358, 0.000003000300, 0.000000000000},
{804, 0.000007745769, 0.000002797139, 0.000000000000}, {805, 0.000007221456, 0.000002607800, 0.000000000000},
{806, 0.000006732475, 0.000002431220, 0.000000000000}, {807, 0.000006276423, 0.000002266531, 0.000000000000},
{808, 0.000005851304, 0.000002113013, 0.000000000000}, {809, 0.000005455118, 0.000001969943, 0.000000000000},
{810, 0.000005085868, 0.000001836600, 0.000000000000}, {811, 0.000004741466, 0.000001712230, 0.000000000000},
{812, 0.000004420236, 0.000001596228, 0.000000000000}, {813, 0.000004120783, 0.000001488090, 0.000000000000},
{814, 0.000003841716, 0.000001387314, 0.000000000000}, {815, 0.000003581652, 0.000001293400, 0.000000000000},
{816, 0.000003339127, 0.000001205820, 0.000000000000}, {817, 0.000003112949, 0.000001124143, 0.000000000000},
{818, 0.000002902121, 0.000001048009, 0.000000000000}, {819, 0.000002705645, 0.000000977058, 0.000000000000},
{820, 0.000002522525, 0.000000910930, 0.000000000000}, {821, 0.000002351726, 0.000000849251, 0.000000000000},
{822, 0.000002192415, 0.000000791721, 0.000000000000}, {823, 0.000002043902, 0.000000738090, 0.000000000000},
{824, 0.000001905497, 0.000000688110, 0.000000000000}, {825, 0.000001776509, 0.000000641530, 0.000000000000},
{826, 0.000001656215, 0.000000598090, 0.000000000000}, {827, 0.000001544022, 0.000000557575, 0.000000000000},
{828, 0.000001439440, 0.000000519808, 0.000000000000}, {829, 0.000001341977, 0.000000484612, 0.000000000000},
{830, 0.000001251141, 0.000000451810, 0.000000000000}};

void xyz_to_rgb(CFLOAT x, CFLOAT y, CFLOAT z, color_t &col)
{
      // xyz->RGB using CIE RGB colsys. (Illuminant E w.point)
      col.set(2.28783848734076f*x - 0.833367677835217f*y - 0.454470795871421f*z,
                              -0.511651380743862f*x + 1.42275837632178f*y + 0.0888930017552939f*z,
                              0.00572040983140966f*x - 0.0159068485104036f*y + 1.0101864083734f*z);
      // correct if outside gamut
      CFLOAT wt = col.minimum();
      if (wt<0.f) col -= color_t(wt);
}

// spectrum color using CIE tables
void wl2rgb_fromCIE(CFLOAT wl, color_t &col)
{
      CFLOAT fr = wl-360.f;
      int p1 = int(fr);
      if (p1<0) { col.black(); return; }
      int p2 = p1+1;
      if (p2>470) { col.black(); return; }
      fr -= floor(fr);
      CFLOAT fr2 = 1.f-fr;
      CFLOAT x = fr2*CIE_XYZcolmat[p1][1] + fr*CIE_XYZcolmat[p2][1];
      CFLOAT y = fr2*CIE_XYZcolmat[p1][2] + fr*CIE_XYZcolmat[p2][2];
      CFLOAT z = fr2*CIE_XYZcolmat[p1][3] + fr*CIE_XYZcolmat[p2][3];
      xyz_to_rgb(x, y, z, col);
}

color_t wl2XYZ(CFLOAT wl)
{
      CFLOAT fr = wl-360.f;
      int p1 = int(fr);
      if (p1<0) { return color_t(0.f); }
      int p2 = p1+1;
      if (p2>470) { return color_t(0.f); }
      fr -= floor(fr);
      CFLOAT fr2 = 1.f-fr;
      CFLOAT x = fr2*CIE_XYZcolmat[p1][1] + fr*CIE_XYZcolmat[p2][1];
      CFLOAT y = fr2*CIE_XYZcolmat[p1][2] + fr*CIE_XYZcolmat[p2][2];
      CFLOAT z = fr2*CIE_XYZcolmat[p1][3] + fr*CIE_XYZcolmat[p2][3];
      return color_t(x, y, z);
}

// from various 'spectral composite model..' papers by Sun et al
// approximation of CIE matching function by gaussians (only used for analysis in paper, not actual model)
// slow but might be useful sometime
void approxSpectrum(CFLOAT wl, color_t &col)
{
      CFLOAT t1=wl-445.f, t2=wl-595.f, t3=wl-560.f, t4=wl-451.f;
      CFLOAT x = 0.38f*exp(-t1*t1*1.3691796159e-3f) + 1.06f*exp(-t2*t2*4.3321698785e-4f);
      CFLOAT y = exp(-t3*t3*2.7725887222e-4f), z = 1.8f*exp(-t4*t4*9.1655825529e-4f);
      xyz_to_rgb(x, y, z, col);
}

// just a simple rainbow gradient, but perfect 1/3 sum,
// could be useful for some things as a fast rough spectrum color approximation
// p in range 0 to 1
void fakeSpectrum(CFLOAT p, color_t &col)
{
      CFLOAT r=4.f*(p-0.75f), g=4.f*(p-0.5f), b=4.f*(p-0.25f);
      col.set(1.f-r*r, 1.f-g*g, 1.f-b*b);
      col.clampRGB0();
}

// returns Cauchy coefficients for the reduced form equation n = A + B/lambda^2
// used to calculate dispersion curve, disp_pw is the refractive index difference Nf-nC
// may not be quite correct or accurate
void CauchyCoefficients(PFLOAT IOR, PFLOAT disp_pw, PFLOAT &CauchyA, PFLOAT &CauchyB)
{
      CauchyA = CauchyB = 0;
      if (disp_pw>0)
      {
            // Fraunhofer line wavelengths, Hydrogen F, Helium d, Hydrogen C
            const PFLOAT lF2=486.13*486.13, ld2=587.56*587.56, lC2=656.27*656.27;
            PFLOAT Vd = (IOR - 1.0) / disp_pw;  // Abbe number
            CauchyB = (lC2 - lF2) * Vd;
            if (CauchyB!=0.0) CauchyB = (lF2 * lC2 * (IOR - 1.0)) / CauchyB;
            CauchyA = IOR - CauchyB/ld2;
      }
}

// returns IOR and color at specified wavelength (not called with actual wavelength, but number in 0-1 range)
// for wl2rgb_fromCIE() & approxSpectrumRGB() range is 380nm to 780nm
// but could shorten it to 400-700 maybe, 720-780 is quite dark anyway
PFLOAT getIORcolor(PFLOAT w, PFLOAT CauchyA, PFLOAT CauchyB, color_t &col)
{
      //PFLOAT wl = 400.0*w + 380.0;
      PFLOAT wl = 300.0*w + 400.0;
      wl2rgb_fromCIE(wl, col);
      col *= 2.214032659670777114f; // scale for CIE sys. equal energy, range 400-700
      return CauchyA + CauchyB/(wl*wl);
}

__END_YAFRAY

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