82 lines
2 KiB
Text
82 lines
2 KiB
Text
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#ifndef __MATH_HPP
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#define __MATH_HPP
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#include <math.h>
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#define EPSILON 0.01f
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/*
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** Floating point compare macros
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*/
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inline int
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EpsilonLessThan(const float a, const float b)
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{
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return (b - a) > EPSILON;
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}
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inline int
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EpsilonGreaterThan(const float a, const float b)
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{
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return (a - b) > EPSILON;
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}
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inline int
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EpsilonEqual(const float a, const float b)
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{
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return !EpsilonLessThan(a, b) && !EpsilonGreaterThan(a, b);
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}
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#define PI 3.141592f /* the venerable pi */
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#define PITIMES2 6.283185f /* 2 * pi */
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#define PIOVER2 1.570796f /* pi / 2 */
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#define E 2.718282f /* the venerable e */
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#define SQRT2 1.414214f /* sqrt(2) */
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#define SQRT3 1.732051f /* sqrt(3) */
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#define GOLDEN 1.618034f /* the golden ratio */
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#define DTOR 0.017453f /* convert degrees to radians */
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#define RTOD 57.29578f /* convert radians to degrees */
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template<class T> const T& Sqr(const T& a) {return a * a;}
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template<class T> const T& Abs(const T& a) {return a < 0 ? -a : a;}
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template<class T> const T& Min(const T& a, const T& b) {return a < b ? a : b;}
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template<class T> const T& Max(const T& a, const T& b) {return a > b ? a : b;}
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template<class T> const T& Clamp(const T& a, const T& l, const T& h) {return Max(Min(a,h),l);}
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#define SWAP(A,B) {(A) ^= (B); (B) ^= (A); (A) ^= (B);}
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inline float
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Interpolate(const float a, const float l, const float h)
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{
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return l + (h - l) * a;
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}
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#define FLOAT_TO_FIX(A) ((A) * (1 << 16))
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#define FIX_TO_FLOAT(A) ((A) / (1 << 16))
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#define INT_TO_FIX(A) ((int)(A) << 16)
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#define FIX_TO_INT(A) ((int)(A) >> 16)
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//#define FIX_TO_INT(A) ((short*)&((int)(A)))[1]
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#define BIG_NUM ((double)1.5 * (double)(1 << 26) * (double)(1 << 26))
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inline int
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Round(double a)
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{
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a += BIG_NUM;
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return *(int*)(&a);
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}
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inline int
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Trunc(double a)
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{
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a += BIG_NUM - 0.5;
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return *(int*)(&a);
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}
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#endif
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