// Copyright (c) 2017, Marty Mills <daggerbot@gmail.com>
// This software is available under the terms of the zlib license.
// See COPYING.md for more information.

/// Interpolates between two values.
pub trait Lerp<T> {
    fn lerp (a: Self, b: Self, t: T) -> Self;
}

macro_rules! impl_lerp {
    ($($ty:ty),*) => { $(
        impl Lerp<f32> for $ty {
            fn lerp (a: $ty, b: $ty, t: f32) -> $ty {
                Lerp::lerp(a, b, t as f64)
            }
        }

        impl Lerp<f64> for $ty {
            fn lerp (a: $ty, b: $ty, t: f64) -> $ty {
                (a as f64 + (b as f64 - a as f64) * t) as $ty
            }
        }
    )* };
}

impl_lerp!(i8, i16, i32, i64, isize, u8, u16, u32, u64, usize, f32, f64);