YiMath.h

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// © You i Labs Inc. 2000-2017. All rights reserved.
#ifndef _YI_MATH_H_
#define _YI_MATH_H_

#include "framework/YiPredef.h"
#include "YiMathTables.h"   //Automatically generated by the "TableMaker" project!!!!!!
#include <math.h>

//Math Functions
#define YI_SIN                      (float)sin
#define YI_COS                      (float)cos
#define YI_FPOW(x, y)                      pow((float)x, (float)y)
#define YI_SQRT(x)                         sqrt(x)



/*****************************************************************************
    Fix point functions.
****************************************************************************/
#define YI_ITOFXW(x) ((x) << 16)            // Integer to fixed point
#define YI_FXTOIW(x) ((x) >> 16)            // Fixed point to integer
#define YI_DIVFXW(x,y) ((y << 16) / (x))            // Divide a fixed by a fixed
#define YI_ITOFX(x) ((x) << 16)         // Integer to fixed point
#define YI_FTOFX(x) (int32_t)((x)*65536) // Float to fixed point
#define YI_DTOFX(x) (int32_t)((x)*65536) // Double to fixed point
#define YI_FXTOI(x) ((x) >> 16)         // Fixed point to integer
#define YI_FXTOF(x) ((float)(x) / 65536) // Fixed point to float
#define YI_FXTOD(x) ((double)(x) / 65536) // Fixed point to double
#define YI_MULFX(x,y) (((y) * (x)) >> 16)       // Multiply a fixed by a fixed
#define YI_MULFX2(x,y) ((((y)>> 16) * ((x)>> 16)))      // Multiply a fixed by a fixed
#define YI_DIVFX(x,y) (((x) << 16) / (y))           // Divide a fixed by a fixed

/*****************************************************************************
    Trigonometry tables.
****************************************************************************/
extern const int32_t YI_ANGLESHIFT; // YI_ANGLE2PI = 1 << YI_ANGLESHIFT
extern const int32_t YI_ANGLE2PI; // equivalent to 2*PI
extern const int32_t YI_ANGLEMASK; // angle mask use to acces trigonometric tables
extern const float YI_PI; // cherry pie!
extern const int32_t YI_TRIG_SHIFT; // shifted 2^n value for sinus/cosinus result
extern const int32_t YI_TRIG_MUL; // sinus/cosinus YI_MAX value (==1)
extern const int32_t YI_ATAN_SIZE;
extern const int16_t g_sYISine[YI_ANGLE2PI];
extern const int16_t g_sYICosine[YI_ANGLE2PI];
extern const uint16_t g_usYIArctan[YI_ATAN_SIZE + 1];
extern const uint16_t g_usYISqrt[256 * 16];

#if 1
//this is faster, but won't work as expected if x is a calculation such as (s++)
#define YI_ABS(x) (((x) < 0) ? -(x) : (x))
#define YI_FABS(x) (((x) < 0) ? -(x) : (x))
#define YI_DABS(x) (((x) < 0) ? -(x) : (x))
#define YI_SGN(x) (((x) > 0 ) ? 1 : ((x) < 0) ? -1 : 0)
#define YI_FSGN(x) (((x) > 0 ) ? 1 : ((x) < 0) ? -1 : 0)
#define YI_SGN2(x, y) (((x) > y ) ? 1 : ((x) < y) ? -1 : 0)
#else
YI_EXTERNINLINE int32_t YI_ABS(int32_t x);
YI_EXTERNINLINE float YI_FABS(float x);
YI_EXTERNINLINE double YI_DABS(double x);
YI_EXTERNINLINE int32_t YI_SGN(int32_t x);
YI_EXTERNINLINE float YI_FSGN(float x);
YI_EXTERNINLINE int32_t YI_SGN2(int32_t x, int32_t y);
#endif
YI_EXTERNINLINE int32_t YI_FLOOR(float fVal);
YI_EXTERNINLINE int32_t YI_FLOOR(double fVal);
YI_EXTERNINLINE int32_t YI_CEIL(float fVal);
YI_EXTERNINLINE int32_t YI_CEIL(double fVal);
YI_EXTERNINLINE int32_t YI_ROUND(float fval);
YI_EXTERNINLINE int32_t YI_ROUND(double fval);
YI_EXTERNINLINE int32_t YI_DIFF(int32_t x, int32_t y);

int32_t Log2(int32_t a);
int32_t Atan2i(int32_t y, int32_t x);
int32_t AngleDiff(int32_t SrcAngle, int32_t TargetAngle);
int32_t YI_INTSQRT(int32_t l2);
int32_t YI_INTSQRT256(int32_t l2);
int32_t YI_POW(int32_t P, int32_t z);

#endif // _YI_MATH_H_