ref: f5ac2689895f48509211ed99fcdcf2f069d2d7de
dir: /src/asm/fixpoint.c/
/*
* This file is part of RGBDS.
*
* Copyright (c) 1997-2021, Carsten Sorensen and RGBDS contributors.
*
* SPDX-License-Identifier: MIT
*/
/*
* Fixed-point math routines
*/
#include <inttypes.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include "asm/fixpoint.h"
#include "asm/symbol.h"
#include "asm/warning.h"
#define fix2double(i) ((double)((i) / 65536.0))
#define double2fix(d) ((int32_t)round((d) * 65536.0))
// pi radians == 32768 fixed-point "degrees"
#define fdeg2rad(f) ((f) * (M_PI / 32768.0))
#define rad2fdeg(r) ((r) * (32768.0 / M_PI))
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
/*
* Print a fixed point value
*/
void fix_Print(int32_t i)
{
uint32_t u = i;
char const *sign = "";
if (i < 0) {
u = -u;
sign = "-";
}
printf("%s%" PRIu32 ".%05" PRIu32, sign, u >> 16,
((uint32_t)(fix2double(u) * 100000 + 0.5)) % 100000);
}
/*
* Calculate sine
*/
int32_t fix_Sin(int32_t i)
{
return double2fix(sin(fdeg2rad(fix2double(i))));
}
/*
* Calculate cosine
*/
int32_t fix_Cos(int32_t i)
{
return double2fix(cos(fdeg2rad(fix2double(i))));
}
/*
* Calculate tangent
*/
int32_t fix_Tan(int32_t i)
{
return double2fix(tan(fdeg2rad(fix2double(i))));
}
/*
* Calculate arcsine
*/
int32_t fix_ASin(int32_t i)
{
return double2fix(rad2fdeg(asin(fix2double(i))));
}
/*
* Calculate arccosine
*/
int32_t fix_ACos(int32_t i)
{
return double2fix(rad2fdeg(acos(fix2double(i))));
}
/*
* Calculate arctangent
*/
int32_t fix_ATan(int32_t i)
{
return double2fix(rad2fdeg(atan(fix2double(i))));
}
/*
* Calculate atan2
*/
int32_t fix_ATan2(int32_t i, int32_t j)
{
return double2fix(rad2fdeg(atan2(fix2double(i), fix2double(j))));
}
/*
* Multiplication
*/
int32_t fix_Mul(int32_t i, int32_t j)
{
return double2fix(fix2double(i) * fix2double(j));
}
/*
* Division
*/
int32_t fix_Div(int32_t i, int32_t j)
{
return double2fix(fix2double(i) / fix2double(j));
}
/*
* Power
*/
int32_t fix_Pow(int32_t i, int32_t j)
{
return double2fix(pow(fix2double(i), fix2double(j)));
}
/*
* Logarithm
*/
int32_t fix_Log(int32_t i, int32_t j)
{
return double2fix(log(fix2double(i)) / log(fix2double(j)));
}
/*
* Round
*/
int32_t fix_Round(int32_t i)
{
return double2fix(round(fix2double(i)));
}
/*
* Ceil
*/
int32_t fix_Ceil(int32_t i)
{
return double2fix(ceil(fix2double(i)));
}
/*
* Floor
*/
int32_t fix_Floor(int32_t i)
{
return double2fix(floor(fix2double(i)));
}