void main()
{
    float time=iGlobalTime*1.0;
    vec2 uv = (gl_FragCoord.xy / iResolution.xx-0.5);

    vec2 r_uv = vec2(uv.x, uv.y + cos(time + uv.x*4.) * .1);
    vec2 g_uv = vec2(uv.x, uv.y + cos(time + uv.x*5.) * .1);
    vec2 b_uv = vec2(uv.x, uv.y + cos(time + uv.x*6.) * .1);

    uv.y += cos(time + uv.x*4.) * .1;
    uv -= vec2(cos(time * .01) * .1);

    float r_d = length(r_uv);
    float g_d = length(g_uv);
    float b_d = length(b_uv);

    float r = smoothstep(0.215, 0.2, r_d);
    float g = smoothstep(0.215, 0.2, g_d);
    float b = smoothstep(0.215, 0.2, b_d);

    vec3 color = vec3(r, g, b);

    gl_FragColor = vec4(color, 1.);
}