precision mediump float;

uniform vec2 iResolution; // viewport resolution (in pixels)
uniform float iTime; // shader playback time (in seconds)
uniform vec2 iMouse; // mouse pixel coords. xy: current (if MLB down), zw: click

vec3 palette(float t) {
    //https://iquilezles.org/articles/palettes/
    vec3 a = vec3(0.1, 0.1, 0.1);
    vec3 b = vec3(0.5, 0.5, 0.5);
    vec3 c = vec3(1.0, 1.0, 1.0);
    vec3 d = vec3(0.0, 0.33, 0.67);

    return a + b * cos(6.28318 * (c * t + d));

precision mediump float;

uniform vec2 iResolution; // viewport resolution (in pixels)
uniform float iTime; // shader playback time (in seconds)
uniform vec2 iMouse; // mouse pixel coords. xy: current (if MLB down), zw: click

vec3 palette(float t) {
    //https://iquilezles.org/articles/palettes/
    vec3 a = vec3(0.1, 0.1, 0.1);
    vec3 b = vec3(0.5, 0.5, 0.5);
    vec3 c = vec3(1.0, 1.0, 1.0);
    vec3 d = vec3(0.0, 0.33, 0.67);

    return a + b * cos(1.28318 * (c * t + d));

precision mediump float;

uniform vec2 iResolution;
uniform float iTime;
uniform vec2 iMouse;

void mainImage(out vec4 fragColor, in vec2 fragCoord) {
    vec2 uv = fragCoord / iResolution.xy;

    // Create two fractionings of coordinate space
    vec2 uv1 = fract(uv * 3.);
    vec2 uv2 = fract((uv - 0.5) * 10. * sin(0.5*iTime+.5)*0.5+0.5);

    // Create 1d vertical noise lines

#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
precision highp int;
#else
precision mediump float;
precision mediump int;
#endif

// Twin-prime midpoints: 4, 6, 12, 18, 30, 42, 60, ...
// We met at 18. Now we're at 30. 
// Happy Birthday, FRB! Here's to (infinitely?) many more!

uniform vec2 iResolution; // viewport resolution (in pixels)
uniform float iTime; // shader playback time (in seconds)