JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

Any URL's added here will be added as `<script>`

s in order, and run *before* the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

` ````
<canvas></canvas>
<script type="x-shader/vertex">
precision mediump float;
attribute vec2 position;
void main () {
gl_Position = vec4(position, 0, 1.0);
}
</script>
<script type="x-shader/fragment">
precision highp float;
uniform float time;
uniform float width;
uniform float height;
const int ITERS = 120;
const float PI = 3.141592654;
const float DEG = PI / 180.0;
vec2 coords() {
float vmin = min(width, height);
return vec2((gl_FragCoord.x - width * .5) / vmin,
(gl_FragCoord.y - height * .5) / vmin);
}
vec2 rotate(vec2 p, float a) {
return vec2(p.x * cos(a) - p.y * sin(a),
p.x * sin(a) + p.y * cos(a));
}
vec2 repeat(in vec2 p, in vec2 c) {
return mod(p, c) - 0.5 * c;
}
int gpf(int num) {
int result = 1;
int limit = int(sqrt(float(num)));
for (int i = 0; i < ITERS; i++) {
int factor = (i == 0) ? 2 : (1 + i * 2);
if (factor > limit) {
break;
}
for (int j = 0; j < ITERS; j++) {
if (int(mod(float(num), float(factor))) != 0) {
break;
}
num = int(num / factor);
result = factor;
}
if (factor > num) {
break;
}
}
if (num > 1) {
result = num;
}
return result;
}
vec2 complexMul(vec2 a, vec2 b) {
return vec2(a.x * b.x - a.y * b.y, a.y * b.x + a.x * b.y);
}
vec2 complexPow(vec2 a, int n) {
vec2 result = vec2(1.0, 0.0);
for (int i = 0; i < ITERS; i++) {
if (i == n) {
break;
}
result = complexMul(result, a);
}
return result;
}
// exponential generating function EG(gpf; z) = Σn=1∞ gpf(n) z^n / (n+1)!
vec2 exponential(vec2 p) {
vec2 x = vec2(0.0, 0.0);
int j = 1;
for (int i = 0; i < 13; i++) {
j = j * (i + 2);
x = x + float(gpf(i + 1)) * complexPow(p * 8.0, int(i + 1)) / float(j);
}
return x;
}
vec3 palette(float x) {
return vec3(.5 + .5 * sin(time * .1+ x * 4.0), sin(time * .2 + x), sin(time *.1 + x + 1.0));
}
void main () {
vec2 p00 = coords();
vec2 p0 = rotate(p00, time *.05);
vec2 exp = exponential(p0 * .3)*.1;
vec2 logExp = log(exp);
vec3 col = palette(
.5 * sin(log(pow(length(exp), 3.0 +
1.0 * sin(time *.1))) + atan(exp.y, exp.x) + time*.2));
gl_FragColor = vec4(col, 1.0);
}
</script>
```

` ````
body {
margin: 0;
}
canvas {
display: block;
width: 100vw;
height: 100vh;
}
```

` ````
import GLea from 'https://terabaud.github.io/hello-webgl/lib/glea/glea.mjs';
const frag = document.querySelector('[type="x-shader/fragment"]').textContent;
const vert = document.querySelector('[type="x-shader/vertex"]').textContent;
const glea = new GLea({
shaders: [
GLea.fragmentShader(frag),
GLea.vertexShader(vert)
],
buffers: {
'position': GLea.buffer(2, [1, 1, -1, 1, 1,-1, -1,-1])
}
}).create();
window.addEventListener('resize', () => {
glea.resize();
});
function loop(time) {
const { gl } = glea;
glea.clear();
glea.uni('width', glea.width);
glea.uni('height', glea.height);
glea.uni('time', time * .005);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
requestAnimationFrame(loop);
}
loop(0);
```

999px

Shift F
Opt F
Find & Replace

Also see: Tab Triggers