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#[cfg(feature = "std")] use std::f32;
#[cfg(not(feature = "std"))] use core::f32;
#[cfg(not(feature = "std"))] use core::intrinsics::cosf32;
#[cfg(feature = "std")] use std::f64;
#[cfg(not(feature = "std"))] use core::f64;
#[cfg(not(feature = "std"))] use core::intrinsics::cosf64;
#[cfg(feature = "std")] use std::ops::{Add, Mul, Sub};
#[cfg(not(feature = "std"))] use core::ops::{Add, Mul, Sub};
pub trait Interpolate<T>: Sized + Copy {
fn lerp(a: Self, b: Self, t: T) -> Self;
fn cubic_hermite(_: (Self, T), a: (Self, T), b: (Self, T), _: (Self, T), t: T) -> Self {
Self::lerp(a.0, b.0, t)
}
}
pub trait Additive:
Copy +
Add<Self, Output = Self> +
Sub<Self, Output = Self> {
}
impl<T> Additive for T
where T: Copy +
Add<Self, Output = Self> +
Sub<Self, Output = Self> {
}
pub trait Linear<T>: Additive {
fn outer_mul(self, t: T) -> Self;
fn outer_div(self, t: T) -> Self;
}
macro_rules! impl_linear_simple {
($t:ty) => {
impl Linear<$t> for $t {
fn outer_mul(self, t: $t) -> Self {
self * t
}
fn outer_div(self, t: $t) -> Self {
self / t
}
}
}
}
impl_linear_simple!(f32);
impl_linear_simple!(f64);
macro_rules! impl_linear_cast {
($t:ty, $q:ty) => {
impl Linear<$t> for $q {
fn outer_mul(self, t: $t) -> Self {
self * t as $q
}
fn outer_div(self, t: $t) -> Self {
self / t as $q
}
}
}
}
impl_linear_cast!(f32, f64);
impl_linear_cast!(f64, f32);
pub trait One {
fn one() -> Self;
}
macro_rules! impl_one_float {
($t:ty) => {
impl One for $t {
#[inline(always)]
fn one() -> Self {
1.
}
}
}
}
impl_one_float!(f32);
impl_one_float!(f64);
pub trait Trigo {
fn pi() -> Self;
fn cos(self) -> Self;
}
impl Trigo for f32 {
#[inline(always)]
fn pi() -> Self {
f32::consts::PI
}
#[inline(always)]
fn cos(self) -> Self {
#[cfg(feature = "std")]
{
self.cos()
}
#[cfg(not(feature = "std"))]
{
unsafe { cosf32(self) }
}
}
}
impl Trigo for f64 {
#[inline(always)]
fn pi() -> Self {
f64::consts::PI
}
#[inline(always)]
fn cos(self) -> Self {
#[cfg(feature = "std")]
{
self.cos()
}
#[cfg(not(feature = "std"))]
{
unsafe { cosf64(self) }
}
}
}
pub fn cubic_hermite_def<V, T>(x: (V, T), a: (V, T), b: (V, T), y: (V, T), t: T) -> V
where V: Linear<T>,
T: Additive + Mul<T, Output = T> + One {
let one_t = T::one();
let two_t = one_t + one_t;
let three_t = two_t + one_t;
let t2 = t * t;
let t3 = t2 * t;
let two_t3 = t3 * two_t;
let three_t2 = t2 * three_t;
let m0 = (b.0 - x.0).outer_div(b.1 - x.1);
let m1 = (y.0 - a.0).outer_div(y.1 - a.1);
a.0.outer_mul(two_t3 - three_t2 + one_t) + m0.outer_mul(t3 - t2 * two_t + t) + b.0.outer_mul(three_t2 - two_t3) + m1.outer_mul(t3 - t2)
}
macro_rules! impl_interpolate_simple {
($t:ty) => {
impl Interpolate<$t> for $t {
fn lerp(a: Self, b: Self, t: $t) -> Self {
a * (1. - t) + b * t
}
fn cubic_hermite(x: (Self, $t), a: (Self, $t), b: (Self, $t), y: (Self, $t), t: $t) -> Self {
cubic_hermite_def(x, a, b, y, t)
}
}
}
}
impl_interpolate_simple!(f32);
impl_interpolate_simple!(f64);
macro_rules! impl_interpolate_via {
($t:ty, $v:ty) => {
impl Interpolate<$t> for $v {
fn lerp(a: Self, b: Self, t: $t) -> Self {
a * (1. - t as $v) + b * t as $v
}
fn cubic_hermite((x, xt): (Self, $t), (a, at): (Self, $t), (b, bt): (Self, $t), (y, yt): (Self, $t), t: $t) -> Self {
cubic_hermite_def((x, xt as $v), (a, at as $v), (b, bt as $v), (y, yt as $v), t as $v)
}
}
}
}
impl_interpolate_via!(f32, f64);
impl_interpolate_via!(f64, f32);