saturn-examples/vdp1/cos.hpp

static constexpr fp16_16 _cos[256] = {
  1.0,
  0.9996988186962042,
  0.9987954562051724,
  0.9972904566786902,
  0.9951847266721969,
  0.99247953459871,
  0.989176509964781,
  0.9852776423889412,
  0.9807852804032304,
  0.9757021300385286,
  0.970031253194544,
  0.9637760657954398,
  0.9569403357322088,
  0.9495281805930367,
  0.9415440651830208,
  0.932992798834739,
  0.9238795325112867,
  0.9142097557035307,
  0.9039892931234433,
  0.8932243011955153,
  0.881921264348355,
  0.8700869911087115,
  0.8577286100002721,
  0.8448535652497071,
  0.8314696123025452,
  0.8175848131515837,
  0.8032075314806449,
  0.7883464276266063,
  0.773010453362737,
  0.7572088465064846,
  0.7409511253549591,
  0.724247082951467,
  0.7071067811865476,
  0.6895405447370669,
  0.6715589548470183,
  0.6531728429537768,
  0.6343932841636455,
  0.6152315905806268,
  0.5956993044924335,
  0.5758081914178453,
  0.5555702330196023,
  0.5349976198870973,
  0.5141027441932217,
  0.4928981922297841,
  0.4713967368259978,
  0.4496113296546066,
  0.4275550934302822,
  0.40524131400498986,
  0.38268343236508984,
  0.3598950365349883,
  0.33688985339222005,
  0.3136817403988916,
  0.29028467725446233,
  0.2667127574748984,
  0.24298017990326398,
  0.21910124015686977,
  0.19509032201612833,
  0.17096188876030136,
  0.14673047445536175,
  0.12241067519921628,
  0.09801714032956077,
  0.07356456359966745,
  0.049067674327418126,
  0.024541228522912264,
  6.123233995736766e-17,
  -0.024541228522912142,
  -0.04906767432741801,
  -0.07356456359966733,
  -0.09801714032956065,
  -0.12241067519921615,
  -0.14673047445536164,
  -0.17096188876030124,
  -0.1950903220161282,
  -0.21910124015686966,
  -0.24298017990326387,
  -0.2667127574748983,
  -0.29028467725446216,
  -0.3136817403988914,
  -0.33688985339221994,
  -0.35989503653498817,
  -0.3826834323650897,
  -0.40524131400498975,
  -0.42755509343028186,
  -0.4496113296546067,
  -0.4713967368259977,
  -0.492898192229784,
  -0.5141027441932217,
  -0.534997619887097,
  -0.555570233019602,
  -0.5758081914178453,
  -0.5956993044924334,
  -0.6152315905806267,
  -0.6343932841636454,
  -0.6531728429537765,
  -0.6715589548470184,
  -0.6895405447370669,
  -0.7071067811865475,
  -0.7242470829514668,
  -0.7409511253549589,
  -0.7572088465064846,
  -0.773010453362737,
  -0.7883464276266062,
  -0.8032075314806448,
  -0.8175848131515836,
  -0.8314696123025453,
  -0.8448535652497071,
  -0.857728610000272,
  -0.8700869911087113,
  -0.8819212643483549,
  -0.8932243011955152,
  -0.9039892931234433,
  -0.9142097557035307,
  -0.9238795325112867,
  -0.9329927988347388,
  -0.9415440651830207,
  -0.9495281805930367,
  -0.9569403357322088,
  -0.9637760657954398,
  -0.970031253194544,
  -0.9757021300385285,
  -0.9807852804032304,
  -0.9852776423889412,
  -0.989176509964781,
  -0.99247953459871,
  -0.9951847266721968,
  -0.9972904566786902,
  -0.9987954562051724,
  -0.9996988186962042,
  -1.0,
  -0.9996988186962042,
  -0.9987954562051724,
  -0.9972904566786902,
  -0.9951847266721969,
  -0.99247953459871,
  -0.989176509964781,
  -0.9852776423889413,
  -0.9807852804032304,
  -0.9757021300385286,
  -0.970031253194544,
  -0.96377606579544,
  -0.9569403357322089,
  -0.9495281805930368,
  -0.9415440651830208,
  -0.932992798834739,
  -0.9238795325112868,
  -0.9142097557035307,
  -0.9039892931234434,
  -0.8932243011955153,
  -0.881921264348355,
  -0.8700869911087115,
  -0.8577286100002721,
  -0.8448535652497072,
  -0.8314696123025455,
  -0.8175848131515837,
  -0.8032075314806449,
  -0.7883464276266063,
  -0.7730104533627371,
  -0.7572088465064848,
  -0.7409511253549591,
  -0.724247082951467,
  -0.7071067811865477,
  -0.689540544737067,
  -0.6715589548470187,
  -0.6531728429537771,
  -0.6343932841636459,
  -0.6152315905806273,
  -0.5956993044924331,
  -0.5758081914178452,
  -0.5555702330196022,
  -0.5349976198870973,
  -0.5141027441932218,
  -0.4928981922297842,
  -0.47139673682599786,
  -0.44961132965460693,
  -0.4275550934302825,
  -0.40524131400499036,
  -0.38268343236509034,
  -0.35989503653498794,
  -0.33688985339221994,
  -0.31368174039889146,
  -0.29028467725446244,
  -0.26671275747489853,
  -0.24298017990326412,
  -0.2191012401568701,
  -0.19509032201612866,
  -0.1709618887603017,
  -0.1467304744553623,
  -0.12241067519921596,
  -0.09801714032956045,
  -0.07356456359966736,
  -0.04906767432741803,
  -0.02454122852291239,
  -1.8369701987210297e-16,
  0.02454122852291202,
  0.04906767432741766,
  0.07356456359966698,
  0.09801714032956009,
  0.1224106751992156,
  0.14673047445536194,
  0.17096188876030133,
  0.1950903220161283,
  0.21910124015686974,
  0.24298017990326376,
  0.2667127574748982,
  0.29028467725446205,
  0.31368174039889113,
  0.3368898533922196,
  0.3598950365349876,
  0.38268343236509,
  0.40524131400499,
  0.42755509343028214,
  0.4496113296546066,
  0.4713967368259976,
  0.49289819222978387,
  0.5141027441932216,
  0.5349976198870969,
  0.5555702330196018,
  0.5758081914178449,
  0.5956993044924329,
  0.615231590580627,
  0.6343932841636456,
  0.6531728429537768,
  0.6715589548470183,
  0.6895405447370668,
  0.7071067811865474,
  0.7242470829514667,
  0.7409511253549589,
  0.7572088465064842,
  0.7730104533627367,
  0.7883464276266059,
  0.803207531480645,
  0.8175848131515837,
  0.8314696123025452,
  0.844853565249707,
  0.857728610000272,
  0.8700869911087113,
  0.8819212643483548,
  0.8932243011955151,
  0.9039892931234431,
  0.9142097557035305,
  0.9238795325112865,
  0.932992798834739,
  0.9415440651830208,
  0.9495281805930367,
  0.9569403357322088,
  0.9637760657954398,
  0.970031253194544,
  0.9757021300385285,
  0.9807852804032303,
  0.9852776423889411,
  0.9891765099647809,
  0.99247953459871,
  0.9951847266721969,
  0.9972904566786902,
  0.9987954562051724,
  0.9996988186962042,
};

constexpr fp16_16 cos(int x)
{
  return _cos[x & 255];
}

constexpr fp16_16 sin(int x)
{
  return _cos[(x + 64) & 255];
}