src/effects/scene2.wgsl


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// Scene2 effect shader - ShaderToy conversion (volumetric clouds)
// Generated by convert_shadertoy.py
// NOTE: Manual review recommended - conversion is basic

#include "sequence_uniforms"
#include "render/fullscreen_uv_vs"

@group(0) @binding(2) var<uniform> uniforms: UniformsSequenceParams;

const CloudColor = vec4f(3.0, 2.3, 1.0, 1.0);

fn N(a: vec3f, p: vec3f) -> f32 {
    return abs(dot(sin(uniforms.time * .7 + 0.1 * p.z + 0.6 * p / a), a));
}

@fragment fn fs_main(in: VertexOutput) -> @location(0) vec4f {
    let r = uniforms.resolution;
    let uv = in.position.xy;
    let u = (2. * uv - r.xy) / r.y;
    let len_u = 1600. * max(length(u), 0.0001);

    var p = vec3f(0.0);
    var col = vec4f(0.0);
    for (var i: f32 = 0.0; i < 100.0; i += 1.0) {
        var s = 6.0 + p.y - .3 * p.x;
        s -= N(vec3f(0.15), p);
        s -= N(vec3f(0.5), p);
        s -= N(vec3f(1.2), p);
        s = 0.1 + abs(s) * 0.2;
        col += CloudColor / s;
	p += vec3f(u * s, s);
    }

    col *= smoothstep(0.8, 0.75 - .3 * uniforms.beat_phase, abs(u.y));
    col = tanh(col / len_u);
    return vec4f(col.rgb, 1.0);
}