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fake-shaders4.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>🌱 faking shaders IV: bitfields</title>
<style>
body {
background-color: #222;
max-width: 512px;
margin: auto;
font-family: serif;
font-size: 1.2em;
color: #edd;
text-align: left;
padding: 20px 8px;
}
@font-face {
font-family: "FontWithASyntaxHighlighter";
src: url("/fonts/FontWithASyntaxHighlighter-Regular.woff2")
format("woff2");
}
pre,
textarea {
font-size: 12px;
font-family: "FontWithASyntaxHighlighter", monospace;
padding: 8px;
border: 0;
outline: none;
overflow: auto;
background-color: #44444490;
width: 100%;
margin: 0px 0;
color: white;
box-sizing: border-box;
}
a {
color: cyan;
font-size: 1em;
}
ul {
margin-top: 10px;
}
canvas {
max-width: 100%;
}
</style>
</head>
<body>
<h2>🌱 faking shaders IV: bitfields</h2>
<p>
This page collects bitfield formulas, originally discovered by
<a href="https://aem1k.com/">aem1k</a> (who also created tixyland). I
don't want to link to the shitsite this was originally posted on..
</p>
<div id="examples" style="width: 512px; max-width: 100%"></div>
<canvas id="canvas" width="512" height="512"></canvas><br />
<textarea id="input" type="text" rows="16" spellcheck="false"></textarea>
<span id="hint"
><small>💡 hit ctrl+enter to update the code.</small>
<small
style="cursor: pointer; opacity: 50%"
onclick="document.querySelector('#hint').remove()"
>hide</small
></span
>
<details>
<summary>show page source</summary>
<pre id="pre"></pre>
</details>
<br />
<a href="/">back to garten.salat</a>
<script>
class FakeShader {
constructor(canvas, scale = 1) {
this.o = { r: 0, g: 0, b: 0 };
this.i = { t: 0, i: 0, x: 0, y: 0, u: 0, v: 0 };
this.g = { dim: 64, sharp: true, animate: true };
this.ctx = canvas.getContext("2d");
const rect = canvas.getBoundingClientRect();
canvas.width = rect.width * scale; // * window.devicePixelRatio;
canvas.height = rect.height * scale; // * window.devicePixelRatio;
}
update(code, lib = "") {
const main = new Function(
"g",
`${lib};const {sin,cos,tan,random,PI,sqrt,hypot,atan,atan2} = Math; ${code}; return main;`
)(this.g);
if (this.lastDim !== this.g.dim) {
this.imageData = this.ctx.createImageData(this.g.dim, this.g.dim);
this.lastDim = this.g.dim;
}
let frame = () => {
const { i, g, imageData, ctx } = this;
this.i.t = performance.now() / 1000;
this.draw(main);
this.g.animate && (this.raf = requestAnimationFrame(frame));
};
this.raf && cancelAnimationFrame(this.raf);
frame();
}
draw(main) {
const { imageData, ctx, i, o, g } = this;
const dim = g.dim;
const blocks = dim * dim; // total blocks
for (let block = 0; block < blocks; block++) {
// calculate normalized coordinates
i.px = block % dim;
i.x = (i.px + 0.5) / dim;
i.py = dim - Math.floor(block / dim) - 1;
i.y = (i.py + 0.5) / dim;
i.i = block;
o.r = o.g = o.b = 0;
main(i, o); // changes contents of o
let blockStart = block * 4; // 4 per block = rgba
imageData.data[blockStart] = o.r * 255;
imageData.data[blockStart + 1] = o.g * 255;
imageData.data[blockStart + 2] = o.b * 255;
imageData.data[blockStart + 3] = 255;
}
ctx.putImageData(imageData, 0, 0);
ctx.imageSmoothingEnabled = !g.sharp; // this needs to be here for some reason
const { width, height } = ctx.canvas;
ctx.drawImage(ctx.canvas, 0, 0, dim, dim, 0, 0, width, height); // scale up
}
}
let libs = `let bitfield = (fn) => {
return ({t,i,px,py},o) => {
x = px;
y = g.dim-py-1;
o.r=o.g=o.b=1-fn(t,i,x,y)
}
}
`;
const canvas = document.querySelector("#canvas");
const input = document.querySelector("#input");
const shader = new FakeShader(canvas);
const updateHash = (code) => {
window.location.hash = "#" + btoa(code);
};
// live coding / sharing logic
window.addEventListener("hashchange", function () {
const urlCode = atob(window.location.hash.slice(1));
input.value = urlCode;
shader.update(input.value, libs);
});
// update on ctrl+enter
input.addEventListener("keydown", (e) => {
if ((e.ctrlKey || e.altKey) && e.key === "Enter") {
updateHash(input.value);
}
});
// read base64 code from url
let urlCode = window.location.hash.slice(1);
if (urlCode) {
urlCode = atob(urlCode);
console.log("loaded code from url!");
}
const fallbackHash =
"LyogYWxpZW5hcnQgKi8KZy5kaW09MjU2Cm1haW4gPSBiaXRmaWVsZCgodCxpLHgseSkgPT4gKAogICh4IF4geSkgJSA5Cikp";
const initialCode = urlCode || atob(fallbackHash);
shader.update(initialCode, libs);
input.value = initialCode;
// examples
let addExample = (code) => {
const canvas = document.createElement("canvas");
canvas.width = 64;
canvas.height = 64;
canvas.style = "cursor: pointer;width:64px;height:64px";
document.querySelector("#examples").appendChild(canvas);
const thumb = new FakeShader(canvas, 4);
thumb.update(`g.animate=0;${code}`, libs);
canvas.addEventListener("click", () => {
shader.update(code, libs);
updateHash(code);
});
canvas.addEventListener("mouseenter", () => {
thumb.update(`g.animate=1;${code}`, libs);
});
canvas.addEventListener("mouseleave", () => {
thumb.update(`g.animate=0;${code}`, libs);
});
};
let examples = {
alienart: "(x ^ y) % 9",
more1: "(x ^ y) % 5",
more2: "(x ^ y) % 17",
more3: "(x ^ y) % 33",
more3: "(x ^ y) % 33",
sierpinski1: "(x | y) % 7",
sierpinski2: "(x | y) % 17",
sierpinski3: "(x | y) % 29",
circular1: "(x * y) & 64",
circular2: "(x * y) & 24",
circular3: "(x * y) & 47",
steps1: "(x ^ y) < 77",
steps2: "(x ^ y) < 214",
steps3: "(x ^ y) < 120",
beams1: "(x * 2) % y",
beams2: "(x * 64) % y",
beams3: "(x * 31) % y",
checker1: "(x ^ y) & 32",
checker2: "(x ^ y) & 72",
checker3: "(x ^ y) & 23",
noise1: "((x * y) ** 4) % 7",
noise2: "((x * y) ** 5) % 99",
noise3: "((x * y) ** 9) % 3",
rotate1: "(x % y) % 4",
rotate2: "(y % x) % 20",
rotate3: "40 % (x % y)",
minimal1: "x & y",
minimal2: "x % y",
minimal3: "x & 9",
combinations1: "(x & y) & (x ^ y) % 19",
combinations2: "((x ^ y) & 32) * (x ^ y) % 9",
combinations3: "(x * 64) % y * ((x ^ y) < 77)",
bitfolly: `(x&y^t*20)%100/128`,
};
Object.entries(examples).forEach(([label, code]) =>
addExample(`/* ${label} */
g.dim=256
main = bitfield((t,i,x,y) => (
${code}
))`)
);
// render code
document.querySelector("#pre").textContent =
document.querySelector("html").outerHTML;
</script>
</body>
</html>