62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
// This code is in the public domain -- castanyo@yahoo.es
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#ifndef NV_MATH_H
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#define NV_MATH_H
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#include <cmath>
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#include <float.h> // finite, isnan
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#include "nvcore/utils.h" // max, clamp
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#define NVMATH_API
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#define NVMATH_CLASS
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#define PI float(3.1415926535897932384626433833)
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#define NV_EPSILON (0.0001f)
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#define NV_NORMAL_EPSILON (0.001f)
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namespace nv
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{
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inline float toRadian(float degree) { return degree * (PI / 180.0f); }
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inline float toDegree(float radian) { return radian * (180.0f / PI); }
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// Robust floating point comparisons:
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// http://realtimecollisiondetection.net/blog/?p=89
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inline bool equal(const float f0, const float f1, const float epsilon = NV_EPSILON)
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{
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//return fabs(f0-f1) <= epsilon;
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return fabs(f0-f1) <= epsilon * max3(1.0f, fabsf(f0), fabsf(f1));
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}
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inline bool isZero(const float f, const float epsilon = NV_EPSILON)
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{
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return fabsf(f) <= epsilon;
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}
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inline bool isFinite(const float f)
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{
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#if defined(_MSC_VER) && _MSC_VER <= 1800
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(void)f;
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return true;
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#else
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return std::isfinite(f);
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#endif // defined(_MSC_VER) && _MSC_VER <= 1800
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}
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// Eliminates negative zeros from a float array.
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inline void floatCleanup(float * fp, int n)
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{
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for (int i = 0; i < n; i++) {
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//nvDebugCheck(isFinite(fp[i]));
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union { float f; uint32 i; } x = { fp[i] };
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if (x.i == 0x80000000) fp[i] = 0.0f;
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}
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}
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inline float saturate(float f) {
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return clamp(f, 0.0f, 1.0f);
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}
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}
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#endif // NV_MATH_H
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