1#import bevy_sprite::mesh2d_view_bindings::globals
2#import bevy_sprite::mesh2d_functions::{
3    get_world_from_local,
4    mesh2d_position_local_to_clip,
5}
6#import noisy_bevy::fbm_simplex_2d_warp_seeded
7
8struct NoiseMaterial {
9    num_warps: i32
10}
11
12@group(2) @binding(0) var<uniform> material: NoiseMaterial;
13
14struct VertexInput {
15    @builtin(instance_index) instance_index: u32,
16    @location(0) position: vec3<f32>,
17    @location(1) blend_color: vec4<f32>,
18};
19
20struct VertexOutput {
21    @builtin(position) clip_position: vec4<f32>,
22    @location(0) object_position: vec2<f32>,
23};
24
25@vertex
26fn vertex(vertex: VertexInput) -> VertexOutput {
27    var out: VertexOutput;
28    let model = get_world_from_local(vertex.instance_index);
29    out.clip_position = mesh2d_position_local_to_clip(model, vec4<f32>(vertex.position, 1.0));
30    out.object_position = vertex.position.xy;
31    return out;
32}
33
34const frequency_scale = 0.005;
35const octaves = 10;
36const lacunarity = 2.9;
37const gain = 0.4;
38const seed = 324.0;
39const scale = vec2(0.4, 0.4);
40const faloff = 0.1;
41
42@fragment
43fn fragment(
44    in: VertexOutput,
45) -> @location(0) vec4<f32> {
46    var position = in.object_position * frequency_scale;
47    position.x += globals.time * 0.001;
48    
49    let warp_result = fbm_simplex_2d_warp_seeded(
50        position,
51        octaves,
52        lacunarity,
53        gain,
54        seed,
55        material.num_warps,
56        scale,
57        faloff
58    );
59
60    // Palette 1 - frost
61    // let base_color_a = vec4(74./255., 98./255., 138./255., 1.);
62    // let base_color_b = vec4(185./255., 229./255., 232./255., 1.);
63    // let base_color_c = vec4(122./255., 178./255., 211./255., 1.);
64    // let base_color_d = vec4(223./255., 242./255., 235./255., 1.);
65
66    // Palette 2 - bath bomb
67    let base_color_a = vec4(9./255., 18./255., 44./255., 1.);
68    let base_color_b = vec4(135./255., 35./255., 65./255., 1.);
69    let base_color_c = vec4(190./255., 49./255., 68./255., 1.);
70    let base_color_d = vec4(225./255., 117./255., 100./255., 1.);
71
72    // Palette 3 - toxic
73    // let base_color_a = vec4(26./255., 26./255., 25./255., 1.);
74    // let base_color_b = vec4(49./255., 81./255., 30./255., 1.);
75    // let base_color_c = vec4(133./255., 159./255., 61./255., 1.);
76    // let base_color_d = vec4(246./255., 252./255., 223./255., 1.);
77
78    let color1 = mix(
79        base_color_a,
80        base_color_d,
81        smoothstep(0.0, 1.0, warp_result.noise_value)
82    );
83
84    let color2 = mix(
85        color1,
86        base_color_b,
87        smoothstep(0.0, 3.0, length(warp_result.positions[0]))
88    );
89
90    let color3 = mix(
91        color2,
92        base_color_c,
93        warp_result.positions[1].y
94    );
95
96    return color3;
97}