ref: 06f7387466eb7d9ee3d9963d3a52a8f455bcaaf2
dir: /src/asm/math.c/
/*
* This file is part of RGBDS.
*
* Copyright (c) 1997-2018, Carsten Sorensen and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
/*
* Fixedpoint math routines
*/
#include <inttypes.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include "asm/mymath.h"
#include "asm/symbol.h"
#define fx2double(i) ((double)((i) / 65536.0))
#define double2fx(d) ((int32_t)((d) * 65536.0))
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
/*
* Define the _PI symbol
*/
void math_DefinePI(void)
{
sym_AddEqu("_PI", double2fx(M_PI));
}
/*
* Print a fixed point value
*/
void math_Print(int32_t i)
{
uint32_t u = i;
const char *sign = "";
if (i < 0) {
u = -u;
sign = "-";
}
printf("%s%" PRIu32 ".%05" PRIu32, sign, u >> 16,
((uint32_t)(fx2double(u) * 100000 + 0.5)) % 100000);
}
/*
* Calculate sine
*/
int32_t math_Sin(int32_t i)
{
return double2fx(sin(fx2double(i) * 2 * M_PI / 65536));
}
/*
* Calculate cosine
*/
int32_t math_Cos(int32_t i)
{
return double2fx(cos(fx2double(i) * 2 * M_PI / 65536));
}
/*
* Calculate tangent
*/
int32_t math_Tan(int32_t i)
{
return double2fx(tan(fx2double(i) * 2 * M_PI / 65536));
}
/*
* Calculate arcsine
*/
int32_t math_ASin(int32_t i)
{
return double2fx(asin(fx2double(i)) / 2 / M_PI * 65536);
}
/*
* Calculate arccosine
*/
int32_t math_ACos(int32_t i)
{
return double2fx(acos(fx2double(i)) / 2 / M_PI * 65536);
}
/*
* Calculate arctangent
*/
int32_t math_ATan(int32_t i)
{
return double2fx(atan(fx2double(i)) / 2 / M_PI * 65536);
}
/*
* Calculate atan2
*/
int32_t math_ATan2(int32_t i, int32_t j)
{
return double2fx(atan2(fx2double(i), fx2double(j)) / 2 / M_PI * 65536);
}
/*
* Multiplication
*/
int32_t math_Mul(int32_t i, int32_t j)
{
return double2fx(fx2double(i) * fx2double(j));
}
/*
* Division
*/
int32_t math_Div(int32_t i, int32_t j)
{
return double2fx(fx2double(i) / fx2double(j));
}
/*
* Round
*/
int32_t math_Round(int32_t i)
{
return double2fx(round(fx2double(i)));
}
/*
* Ceil
*/
int32_t math_Ceil(int32_t i)
{
return double2fx(ceil(fx2double(i)));
}
/*
* Floor
*/
int32_t math_Floor(int32_t i)
{
return double2fx(floor(fx2double(i)));
}