42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
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#include "compute.h"
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void ReadData (int * data, const int len) {
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static int t = 0;
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for (int n=0; n<len; n++) data [n] = t++;
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}
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float msqrtf(const float x) {
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if (x <= 0.0f) return 0.0f;
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float y = x;
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for (unsigned n=0; n<10; n++) {
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y = 0.5f * (y + x/y);
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}
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// Debug ("delta=%f\n", fabs(y - sqrtf(x)));
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return y;
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}
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static constexpr float mfabs (const float a) { return a < 0.0f ? -a : +a; }
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//static constexpr int iround (const float a) { return a < 0.0f ? int (a - 0.5f) : int (a + 0.5f); }
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static constexpr float D_PI = 2.0f * 3.141592653f;
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/**
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* @brief sinus nebo kosinus
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* @param x úhel v radiánech
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* @param even počítá sinus, pokud even=true i kosinus, pokud even=false
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* @return float výsledek
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*/
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float sincos (const float x, const bool even) {
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if (x > +D_PI) return sincos (x - D_PI, even);
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if (x < -D_PI) return sincos (x + D_PI, even);
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float result (0.0f), element(1.0f), divider(0.0f);
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if (even) { element *= x; divider += 1.0f; }
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constexpr float eps = 1.0e-8f; // maximální chyba výpočtu
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const float aa = - (x * x);
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for (;;) {
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result += element;
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if (mfabs (element) < eps) break;
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divider += 1.0f;
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float fact = divider;
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divider += 1.0f;
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fact *= divider;
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element *= aa / fact;
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}
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return result;
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}
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