ref: e12cb95079f001aae1b1eeecd2463ccc61da1c30
dir: /src/asm/math.c/
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* INCLUDES
*
*/
#include <math.h>
#include <stdio.h>
#include "types.h"
#include "mymath.h"
#include "symbol.h"
#define fix2double(i) ((double)(i/65536.0))
#define double2fix(d) ((SLONG)(d*65536.0))
#ifndef PI
#define PI (acos(-1))
#endif
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Define the _PI symbol
*
*/
void math_DefinePI (void)
{
sym_AddEqu ("_PI", double2fix (PI));
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Print a fixed point value
*
*/
void math_Print (SLONG i)
{
if (i >= 0)
printf ("%ld.%05ld", i >> 16, ((SLONG) (fix2double (i) * 100000 + 0.5)) % 100000);
else
printf ("-%ld.%05ld", (-i) >> 16, ((SLONG) (fix2double (-i) * 100000 + 0.5)) % 100000);
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Calculate sine
*
*/
SLONG math_Sin (SLONG i)
{
return (double2fix (sin (fix2double (i) * 2 * PI / 65536)));
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Calculate cosine
*
*/
SLONG math_Cos (SLONG i)
{
return (double2fix (cos (fix2double (i) * 2 * PI / 65536)));
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Calculate tangent
*
*/
SLONG math_Tan (SLONG i)
{
return (double2fix (tan (fix2double (i) * 2 * PI / 65536)));
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Calculate sine^-1
*
*/
SLONG math_ASin (SLONG i)
{
return (double2fix (asin (fix2double (i)) / 2 / PI * 65536));
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Calculate cosine^-1
*
*/
SLONG math_ACos (SLONG i)
{
return (double2fix (acos (fix2double (i)) / 2 / PI * 65536));
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Calculate tangent^-1
*
*/
SLONG math_ATan (SLONG i)
{
return (double2fix (atan (fix2double (i)) / 2 / PI * 65536));
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Calculate atan2
*
*/
SLONG math_ATan2 (SLONG i, SLONG j)
{
return (double2fix (atan2 (fix2double (i), fix2double (j)) / 2 / PI * 65536));
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Multiplication
*
*/
SLONG math_Mul (SLONG i, SLONG j)
{
return (double2fix (fix2double (i) * fix2double (j)));
}
/*
* RGBAsm - MATH.C (Fixedpoint math routines)
*
* Division
*
*/
SLONG math_Div (SLONG i, SLONG j)
{
return (double2fix (fix2double (i) / fix2double (j)));
}