1#define_import_path bevy_water::noise::vnoise
2
3#import bevy_water::noise::random::{
4	random2di, cubic_hermite_curve_2d,
5}
6
7fn vnoise2d(v: vec2<f32>) -> f32 {
8	let i = floor(v);
9	let f = fract(v);
10
11	// corners.
12	let a = random2di(i);
13	let b = random2di(i + vec2<f32>(1.0, 0.0));
14	let c = random2di(i + vec2<f32>(0.0, 1.0));
15	let d = random2di(i + vec2<f32>(1.0, 1.0));
16
17	// Smooth
18    let u = cubic_hermite_curve_2d(f);
19
20	// Mix
21	return mix(a, b, u.x) +
22		(c - a) * u.y * (1.0 - u.x) +
23		(d - b) * u.x * u.y;
24}