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feat: added interpolation.rs for different kinds of interpolations

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lisk77 2025-03-31 20:58:25 +02:00
parent d0e9a1b456
commit 87a7a13211
1 changed files with 33 additions and 0 deletions
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crates/comet_math/src/interpolation.rs Normal file
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use std::f32::consts::PI;
pub fn lerp(a: f32, b: f32, t: f32) -> f32 {
a * (1.0 - t) + b * t
}
pub fn inverse_lerp(a: f32, b: f32, x: f32) -> f32 {
(x - a) / (b - a)
}
pub fn smoothstep(edge0: f32, edge1: f32, x: f32) -> f32 {
let t = ((x - edge0) / (edge1 - edge0)).clamp(0.0, 1.0);
t * t * (3.0 - 2.0 * t)
}
pub fn inverse_smoothstep(v: f32) -> f32 {
(0.5 - (0.5 - v.sqrt()).sqrt()).clamp(0.0, 1.0)
}
pub fn smootherstep(edge0: f32, edge1: f32, x: f32) -> f32 {
let t = ((x - edge0) / (edge1 - edge0)).clamp(0.0, 1.0);
t * t * t * (t * (t * 6.0 - 15.0) + 10.0)
}
pub fn cosine_interpolate(a: f32, b: f32, x: f32) -> f32 {
let ft = x * PI;
let f = (1.0 - ft.cos()) * 0.5;
a * (1.0 - f) + b * f
}
pub fn inverse_cosine_interpolate(a: f32, b: f32, v: f32) -> f32 {
((1.0 - 2.0 * (v - a) / (b - a)).acos()) / PI
}