76 lines
1.4 KiB
Rust
76 lines
1.4 KiB
Rust
use std::fmt::{Debug, Display, Formatter};
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use std::ops::{Add, AddAssign, Sub, SubAssign};
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#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
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#[repr(transparent)]
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pub struct Fixed(pub i32);
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impl Fixed {
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pub fn from_1616(i: i32) -> Self {
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Self(i >> 8)
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}
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pub fn from_int(i: i32) -> Self {
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Self(i << 8)
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}
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pub fn round_down(self) -> i32 {
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self.0 >> 8
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}
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pub fn apply_fract(self, i: i32) -> Self {
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Self((i << 8) | (self.0 & 255))
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}
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}
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impl From<f64> for Fixed {
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fn from(v: f64) -> Self {
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Self((v * 256.0) as i32)
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}
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}
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impl From<Fixed> for f64 {
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fn from(v: Fixed) -> Self {
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v.0 as f64 / 256.0
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}
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}
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impl Debug for Fixed {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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Debug::fmt(&f64::from(*self), f)
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}
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}
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impl Display for Fixed {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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Display::fmt(&f64::from(*self), f)
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}
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}
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impl Sub for Fixed {
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type Output = Self;
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fn sub(self, rhs: Self) -> Self::Output {
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Self(self.0 - rhs.0)
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}
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}
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impl Add for Fixed {
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type Output = Self;
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fn add(self, rhs: Self) -> Self::Output {
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Self(self.0 + rhs.0)
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}
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}
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impl AddAssign for Fixed {
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fn add_assign(&mut self, rhs: Self) {
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self.0 += rhs.0;
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}
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}
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impl SubAssign for Fixed {
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fn sub_assign(&mut self, rhs: Self) {
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self.0 -= rhs.0;
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}
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}
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