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pub trait Translate<T> {
fn translate(value: T) -> Self;
}
macro_rules! identity {
($ty:ty) => {
impl Translate<$ty> for $ty {
fn translate(value: $ty) -> Self {
value
}
}
};
}
macro_rules! int_to_float {
($signed:ident, $unsigned:ident, $float:ident) => {
impl Translate<$signed> for $float {
#[inline]
fn translate(value: $signed) -> Self {
if value < 0 {
(value as $float / -($signed::MIN as $float))
} else {
(value as $float / $signed::MAX as $float)
}
}
}
impl Translate<$float> for $signed {
#[inline]
fn translate(value: $float) -> Self {
if value >= 0.0 {
(value * $signed::MAX as $float) as $signed
} else {
(-value * $signed::MIN as $float) as $signed
}
}
}
impl Translate<$float> for $unsigned {
#[inline]
fn translate(value: $float) -> Self {
let value = value.clamp(-1.0, 1.0);
(((value + 1.0) * 0.5) * $unsigned::MAX as $float).round() as $unsigned
}
}
impl Translate<$unsigned> for $float {
#[inline]
fn translate(value: $unsigned) -> Self {
$float::translate(i16::translate(value))
}
}
};
}
identity!(f32);
identity!(f64);
identity!(i16);
identity!(u16);
int_to_float!(i16, u16, f32);
int_to_float!(i16, u16, f64);
impl Translate<u16> for i16 {
#[inline]
fn translate(value: u16) -> Self {
(value as i16).wrapping_sub(i16::MIN)
}
}
impl Translate<i16> for u16 {
#[inline]
fn translate(value: i16) -> Self {
value.wrapping_add(i16::MIN) as u16
}
}
impl Translate<f32> for f64 {
#[inline]
fn translate(value: f32) -> Self {
value as f64
}
}
impl Translate<f64> for f32 {
#[inline]
fn translate(value: f64) -> Self {
value as f32
}
}