ref: a079a69b7c717500850e286d68a809fb13331b0a
dir: /src/asm/math.c/
/*
* Fixedpoint math routines
*/
#include <math.h>
#include <stdio.h>
#include "types.h"
#include "asm/mymath.h"
#include "asm/symbol.h"
#define fix2double(i) ((double)(i/65536.0))
#define double2fix(d) ((SLONG)(d*65536.0))
#ifndef PI
#define PI (acos(-1))
#endif
/*
* Define the _PI symbol
*/
void
math_DefinePI(void)
{
sym_AddEqu("_PI", double2fix(PI));
}
/*
* 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);
}
/*
* Calculate sine
*/
SLONG
math_Sin(SLONG i)
{
return (double2fix(sin(fix2double(i) * 2 * PI / 65536)));
}
/*
* Calculate cosine
*/
SLONG
math_Cos(SLONG i)
{
return (double2fix(cos(fix2double(i) * 2 * PI / 65536)));
}
/*
* Calculate tangent
*/
SLONG
math_Tan(SLONG i)
{
return (double2fix(tan(fix2double(i) * 2 * PI / 65536)));
}
/*
* Calculate arcsine
*/
SLONG
math_ASin(SLONG i)
{
return (double2fix(asin(fix2double(i)) / 2 / PI * 65536));
}
/*
* Calculate arccosine
*/
SLONG
math_ACos(SLONG i)
{
return (double2fix(acos(fix2double(i)) / 2 / PI * 65536));
}
/*
* Calculate arctangent
*/
SLONG
math_ATan(SLONG i)
{
return (double2fix(atan(fix2double(i)) / 2 / PI * 65536));
}
/*
* Calculate atan2
*/
SLONG
math_ATan2(SLONG i, SLONG j)
{
return (double2fix
(atan2(fix2double(i), fix2double(j)) / 2 / PI * 65536));
}
/*
* Multiplication
*/
SLONG
math_Mul(SLONG i, SLONG j)
{
return (double2fix(fix2double(i) * fix2double(j)));
}
/*
* Division
*/
SLONG
math_Div(SLONG i, SLONG j)
{
return (double2fix(fix2double(i) / fix2double(j)));
}
/*
* Round
*/
SLONG
math_Round(SLONG i)
{
return double2fix(round(fix2double(i)));
}
/*
* Ceil
*/
SLONG
math_Ceil(SLONG i)
{
return double2fix(ceil(fix2double(i)));
}
/*
* Floor
*/
SLONG
math_Floor(SLONG i)
{
return double2fix(floor(fix2double(i)));
}