sjmueller / noisy_bevy

Simple stupid noise primitives for WGSL and Rust (glam/bevy types)

noisy_bevy

Simple stupid noise primitives for glam types (Vec2, Vec3) and wgsl.

Main motivations are:

• ergonomic usage with Bevy
• same results on rust and wgsl (not bit-level perfect, though)

Implemented noise primitives:

• [simplex_noise_2d]
• [simplex_noise_2d_seeded]
• [simplex_noise_3d]
• [fbm_simplex_2d]
• [fbm_simplex_2d_seeded]
• [fbm_simplex_3d]

Usage

From rust

Zero initialization, just call the noise functions:

use bevy::prelude::*;
use noisy_bevy::simplex_noise_2d;

let p = Vec2::new(12.3, 45.6);
let value = simplex_noise_2d(p);

From wgsl shaders

First add the plugin to the Bevy app:

App::new()
    .add_plugin(NoisyShaderPlugin)

And import it and use it in your shaders, with the same API as on the CPU-side:

#import noisy_bevy simplex_noise_2d

// ...

let p = vec2(12.3, 45.6);
let value = simplex_noise_2d(p);

See the asteroids example, for an example that uses noise to procedurally generate a tilemap on the CPU and a matching background in a wgsl shader.

Bevy Version Support

The main branch targets the latest bevy release.

bevy	noisy_bevy
0.13	0.6, main
0.12	0.5
0.11	0.4
0.10	0.3
0.9	0.2
0.8	0.1

License

MIT

The original simplex noise source is MIT-only, however all changes made by me or PRs to this repo are also available under Apache-2.0.

Acknowledgments

The noise primitives are ports/copies of these

• https://github.com/stegu/psrdnoise
• https://gist.github.com/munrocket/236ed5ba7e409b8bdf1ff6eca5dcdc39

Contributions

PRs welcome!