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// Curl-noise flow field
uniform sampler2D uPosition;
uniform float uDt;
vec3 curlNoise(vec3 p) {
    float e = 0.1;
    vec3 dx = vec3(e, 0.0, 0.0);
    vec3 dy = vec3(0.0, e, 0.0);
    vec3 dz = vec3(0.0, 0.0, e);
    float x = snoise(p + dy) - snoise(p - dz);
    float y = snoise(p + dz) - snoise(p - dx);
    float z = snoise(p + dx) - snoise(p - dy);
    return vec3(x, y, z) / (2.0 * e);
}
void main() {
    vec2 uv = gl_FragCoord.xy / resolution.xy;
    vec3 pos = texture2D(uPosition, uv).xyz;
    pos += curlNoise(pos * 0.18) * uDt;
    gl_FragColor = vec4(pos, 1.0);
}