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#ifndef PX_FOUNDATION_PX_MATH_H
#define PX_FOUNDATION_PX_MATH_H

/** \addtogroup foundation
@{
*/

#include <math.h>
#include <float.h>

#include "foundation/PxIntrinsics.h"
#include "foundation/PxAssert.h"

#ifndef PX_DOXYGEN
namespace physx
{
#endif

	// constants
	static const PxReal PxPi		=	PxReal(3.141592653589793);
	static const PxReal PxHalfPi	=	PxReal(1.57079632679489661923);
	static const PxReal PxTwoPi		=	PxReal(6.28318530717958647692);
	static const PxReal PxInvPi		=	PxReal(0.31830988618379067154);


	/**
	\brief The return value is the greater of the two specified values. 
	*/
	template<class T>
	PX_CUDA_CALLABLE PX_FORCE_INLINE T PxMax(T a, T b)							{ return a<b ? b : a;	}

	//! overload for float to use fsel on xbox
	template<>
	PX_CUDA_CALLABLE PX_FORCE_INLINE float PxMax(float a, float b)				{ return intrinsics::selectMax(a, b); }

	/**
	\brief The return value is the lesser of the two specified values. 
	*/
	template<class T>
	PX_CUDA_CALLABLE PX_FORCE_INLINE T PxMin(T a, T b)							{ return a<b ? a : b;	}

	template<>
	//! overload for float to use fsel on xbox
	PX_CUDA_CALLABLE PX_FORCE_INLINE float PxMin(float a, float b)				{ return intrinsics::selectMin(a, b); }

	/*
	Many of these are just implemented as PX_CUDA_CALLABLE PX_FORCE_INLINE calls to the C lib right now,
	but later we could replace some of them with some approximations or more
	clever stuff.
	*/

	/**
	\brief abs returns the absolute value of its argument. 
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxAbs(PxF32 a)						{ return intrinsics::abs(a);	}

	PX_CUDA_CALLABLE PX_FORCE_INLINE bool PxEquals(PxF32 a, PxF32 b,PxF32 eps)	{ return (PxAbs(a - b) < eps);	}

	/**
	\brief abs returns the absolute value of its argument. 
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxAbs(PxF64 a)						{ return ::fabs(a);	}

	/**
	\brief abs returns the absolute value of its argument. 
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxI32 PxAbs(PxI32 a)						{ return ::abs(a);	}

	/**
	\brief Clamps v to the range [hi,lo]
	*/
	template<class T>
	PX_CUDA_CALLABLE PX_FORCE_INLINE T PxClamp(T v, T lo, T hi)					{ PX_ASSERT(lo<=hi); return PxMin(hi, PxMax(lo, v)); }

	//!	\brief Square root.
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxSqrt(PxF32 a)						{ return intrinsics::sqrt(a);		}

	//!	\brief Square root.
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxSqrt(PxF64 a)						{ return ::sqrt(a);	}

	//!	\brief reciprocal square root.
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxRecipSqrt(PxF32 a)					{ return intrinsics::recipSqrt(a);	}

	//!	\brief reciprocal square root.
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxRecipSqrt(PxF64 a)					{ return 1/::sqrt(a);	}

	//!trigonometry -- all angles are in radians.

	//!	\brief Sine of an angle ( <b>Unit:</b> Radians )
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxSin(PxF32 a)						{ return intrinsics::sin(a);				}

	//!	\brief Sine of an angle ( <b>Unit:</b> Radians )
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxSin(PxF64 a)						{ return ::sin(a);							}

	//!	\brief Cosine of an angle (<b>Unit:</b> Radians)
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxCos(PxF32 a)						{ return intrinsics::cos(a);				}

	//!	\brief Cosine of an angle (<b>Unit:</b> Radians)
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxCos(PxF64 a)						{ return ::cos(a);							}

	/**
	\brief Tangent of an angle.
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxTan(PxF32 a)						{ return ::tan(a);							}

	/**
	\brief Tangent of an angle.
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxTan(PxF64 a)						{ return ::tan(a);							}

	/**
	\brief Arcsine.
	Returns angle between -PI/2 and PI/2 in radians
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxAsin(PxF32 f)						{ return ::asin(PxClamp(f,-1.0f,1.0f));	}

	/**
	\brief Arcsine.
	Returns angle between -PI/2 and PI/2 in radians
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxAsin(PxF64 f)						{ return ::asin(PxClamp(f,-1.0,1.0));		}

	/**
	\brief Arccosine.
	Returns angle between 0 and PI in radians
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxAcos(PxF32 f)						{ return ::acos(PxClamp(f,-1.0f,1.0f));			}

	/**
	\brief Arccosine.
	Returns angle between 0 and PI in radians
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxAcos(PxF64 f)						{ return ::acos(PxClamp(f,-1.0,1.0));				}

	/**
	\brief ArcTangent.
	Returns angle between -PI/2 and PI/2 in radians
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxAtan(PxF32 a)						{ return ::atan(a);	}

	/**
	\brief ArcTangent.
	Returns angle between -PI/2 and PI/2 in radians
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxAtan(PxF64 a)						{ return ::atan(a);	}

	/**
	\brief Arctangent of (x/y) with correct sign.
	Returns angle between -PI and PI in radians
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxAtan2(PxF32 x, PxF32 y)			{ return ::atan2(x,y);	}

	/**
	\brief Arctangent of (x/y) with correct sign.
	Returns angle between -PI and PI in radians
	<b>Unit:</b> Radians
	*/
	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF64 PxAtan2(PxF64 x, PxF64 y)			{ return ::atan2(x,y);	}

	//!	\brief returns true if the passed number is a finite floating point number as opposed to INF, NAN, etc.
	PX_CUDA_CALLABLE PX_FORCE_INLINE bool PxIsFinite(PxF32 f)					{ return intrinsics::isFinite(f);	}

	//!	\brief returns true if the passed number is a finite floating point number as opposed to INF, NAN, etc.
	PX_CUDA_CALLABLE PX_FORCE_INLINE bool PxIsFinite(PxF64 f)					{ return intrinsics::isFinite(f);	}

	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxFloor(PxF32 a)						{ return ::floorf(a);					}

	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxExp(PxF32 a)						{ return ::expf(a);	}

	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxCeil(PxF32 a)						{ return ::ceilf(a);	}

	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxSign(PxF32 a)						{ return physx::intrinsics::sign(a); }

	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxPow(PxF32 x,PxF32 y)				{ return ::powf(x,y); };

	PX_CUDA_CALLABLE PX_FORCE_INLINE PxF32 PxLog(PxF32 x)						{ return ::log(x); };

#ifndef PX_DOXYGEN
} // namespace physx
#endif

/** @} */
#endif // PX_FOUNDATION_PX_MATH_H