132 lines
2.9 KiB
Plaintext
132 lines
2.9 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef __OSG_MATH
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#define __OSG_MATH
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#include <math.h>
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#if defined(WIN32) || defined (macintosh)|| defined (sun) || defined (__DARWIN_OSX__)
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#include <float.h>
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// PJA MAC OSX
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// This appears to be the simplest way to get these defined under MACOSX
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// where they arent in math.h
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#ifndef acosf
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#define acosf (float)acos
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#endif
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#ifndef asinf
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#define asinf (float)asin
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#endif
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#ifndef cosf
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#define cosf (float)cos
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#endif
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#ifndef sinf
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#define sinf (float)sin
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#endif
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#ifndef logf
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#define logf (float)log
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#endif
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#ifndef floorf
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#define floorf (float)floor
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#endif
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#ifndef powf
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#define powf (float)pow
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#endif
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#ifndef sqrtf
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#define sqrtf (float)sqrt
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#endif
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#ifndef fabsf
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#define fabsf (float)fabs
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#endif
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#ifndef isnanf
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#define isnanf (float)isnan
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#endif
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#endif
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namespace osg {
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// define the stand trig values
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#ifdef PI
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#undef PI
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#undef PI_2
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#undef PI_4
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#endif
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const double PI = 3.14159265358979323846;
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const double PI_2 = 1.57079632679489661923;
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const double PI_4 = 0.78539816339744830962;
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template<typename T>
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inline T clampTo(T v,T minimum,T maximum) { return v<minimum?minimum:v>maximum?maximum:v; }
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template<typename T>
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inline T clampAbove(T v,T minimum) { return v<minimum?minimum:v; }
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template<typename T>
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inline T clampBelow(T v,T maximum) { return v>maximum?maximum:v; }
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template<typename T>
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inline T sign(T v) { return v<(T)0?(T)-1:(T)1; }
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template<typename T>
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inline T square(T v) { return v*v; }
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template<typename T>
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inline T signedSquare(T v) { return v<(T)0?-v*v:v*v;; }
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template<typename T>
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inline T inDegrees(T angle) { return angle*(T)PI/(T)180.0; }
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template<typename T>
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inline T inRadians(T angle) { return angle; }
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template<typename T>
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inline T DegreesToRadians(T angle) { return angle*(T)PI/(T)180.0; }
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template<typename T>
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inline T RadiansToDegrees(T angle) { return angle*(T)180.0/(T)PI; }
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#if defined(WIN32) && !defined(__CYGWIN__) && !defined(__MWERKS__)
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inline bool isNaN(float v) { return _isnan(v)!=0; }
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inline bool isNaN(double v) { return _isnan(v)!=0; }
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#else
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inline bool isNaN(float v) { return isnan(v); }
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inline bool isNaN(double v) { return isnan(v); }
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#endif
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/** compute the volume of tetrahedron */
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template<typename T>
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inline float computeVolume(const T& a,const T& b,const T& c,const T& d)
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{
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return fabs(((b-c)^(a-b))*(d-b));
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}
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/** compute the volume of prism */
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template<typename T>
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inline float computeVolume(const T& f1,const T& f2,const T& f3,
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const T& b1,const T& b2,const T& b3)
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{
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return computeVolume(f1,f2,f3,b1)+
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computeVolume(b1,b2,b3,f2)+
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computeVolume(b1,b3,f2,f3);
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}
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}
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#endif // __OSG_MATH
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