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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970#ifndef AC_OSKIEWAR_MATH_H#define AC_OSKIEWAR_MATH_H#include <math.h>// Exact operation order from xbox/live/oskiewar.js. Compile without FMA// contraction: these results are part of the paired simulation protocol.#if defined(__GNUC__) && !defined(__clang__)#pragma GCC push_options#pragma GCC optimize ("fp-contract=off")#endif#pragma STDC FP_CONTRACT OFFstatic double ow_sin(double x) { x = fmod(x, 6.283185307179586); if (x > 3.141592653589793) x -= 6.283185307179586; if (x < -3.141592653589793) x += 6.283185307179586; if (x > 1.5707963267948966) x = 3.141592653589793 - x; if (x < -1.5707963267948966) x = -3.141592653589793 - x; const double square = x * x; return x * (1 + square * (-.16666666666666666 + square * (.008333333333333333 + square * (-.0001984126984126984 + square * (.0000027557319223985893 + square * (-.00000002505210838544172 + square * (.00000000016059043836821615 + square * (-.0000000000007647163731819816 + square * (.0000000000000028114572543455206 + square * (-.00000000000000000822063524662433 + square * .000000000000000000019572941063391263))))))))));}static double ow_atan(double x) { const double sign = x < 0 ? -1 : 1; x = fabs(x); const int inverse = x > 1; if (inverse) x = 1 / x; x = x / (1 + sqrt(1 + x * x)); const double square = x * x; double term = x, sum = x; for (int n = 1; n <= 20; n++) { term *= -square; sum += term / (2 * n + 1); } const double angle = 2 * sum; return sign * (inverse ? 1.5707963267948966 - angle : angle);}static double ow_atan2(double y, double x) { if (x > 0) return ow_atan(y / x); if (x < 0) return ow_atan(y / x) + (y < 0 ? -1 : 1) * 3.141592653589793; return y > 0 ? 1.5707963267948966 : y < 0 ? -1.5707963267948966 : 0;}static double ow_exp(double x) { if (x > 709.782712893384) return INFINITY; if (x < -745.1332191019411) return 0; if (isnan(x)) return x; double quotient = x / .6931471805599453; double exponent = floor(quotient); if (quotient - exponent >= .5) exponent++; const double remainder = x - exponent * .6931471805599453; double sum = 1, term = 1; for (int n = 1; n <= 16; n++) { term *= remainder / n; sum += term; } return sum * ldexp(1, (int)exponent);}static double ow_hypot(const double *values, int count) { double scale = 0; for (int i = 0; i < count; i++) { double v = fabs(values[i]); if (isnan(v)) return v; if (v > scale) scale = v; } if (!scale || !isfinite(scale)) return scale; double sum = 0; for (int i = 0; i < count; i++) { double ratio = values[i] / scale; sum += ratio * ratio; } return sqrt(sum) * scale;}#if defined(__GNUC__) && !defined(__clang__)#pragma GCC pop_options#endif#endif