math.h

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// File name: math.h
// Des: Dar in file tamame tabe haye riyazi gharar migire.
// Date: 30/8/1385
// Programmer: Ali Akbar Mohammadi(Kochol)

#ifndef KGE_MATH_H
#define KGE_MATH_H

namespace kge
{
namespace math
{
        class Sphere;
        class Vector;
        class Plane;

        enum CollisionType
        {
                ECT_Out          ,                      
                ECT_In           ,                      
                ECT_Front    ,                  
                ECT_Behind   ,                  
                ECT_Intersect,                  
                ECT_NotIntersect                
        }; // Collision type

        const float PI          = 3.141592654f;
        const float TwoPI       = 6.283185307f;
        const float PiOver2     = 1.570796326f;

        const float fDegToRad = 0.0174532925f;
        const float fRadToDeg = 57.295779513f;

        const float fEpsilon  = 0.000001f;


        inline float DegToRad(float Degree)
        {
                return (Degree * fDegToRad);

        } // DegToRad



        inline float RadToDeg(float Radian)
        {
                return (Radian / PI * 180);

        } // RadToDeg
        
        inline float abs(float Number)
        {
                if ( Number < 0 ) return -Number;
                
                return Number;

        } // abs

        inline int pow(int x, int y)
        {
                //if (y == 0)
                //      return 1;
                //return pow(x, y - 1) * x;
                int result = 1;
                for (; y > 0; --y)
                        result *= x;
                return result;

        } // pow

        // max - float
        inline float Max(float A,float B)
        {
                return (A>=B) ? A : B;
        }


        // min - float
        inline float Min(float A,float B)
        {
                return (A<=B) ? A : B;
        }


        bool SweptSpherePlaneIntersect(float& t0, float& t1, 
                const Plane& plane, const Sphere& sphere, const Vector& sweepDir);

} // math

} // kge

#endif // KGE_MATH_H