implement PPTY

This commit is contained in:
Emile Clark-Boman 2026-02-03 20:26:22 +10:00
parent a13032c76e
commit d76ac04531
12 changed files with 499 additions and 118 deletions

50
www/css/ppty.css Normal file
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@ -0,0 +1,50 @@
/* =========================================================== *
* Pseudo-Pseudo-Terminal Effect *
/* =========================================================== */
.ppty {
background-color: var(--theme-bg);
border: 0.5ch solid var(--theme-tty-border);
margin: auto auto;
padding: 20px;
position: relative;
height: auto;
/* display: block; */
/* flex-direction: column; */
/* justify-content: start; */
/* align-content: center; */
/* align-items: start; */
overflow: hidden;
}
.ppty-block {
color: var(--theme-tty-output);
visibility: hidden;
white-space: nowrap; /* only break on <br/> */
}
.ppty-prompt {
color: var(--theme-tty-prompt);
display: inline-block;
vertical-align: top;
}
.ppty-command {
color: var(--theme-tty-command);
width: 0px;
border-right: 1ch solid var(--theme-tty-output);
display: inline-block;
vertical-align: top;
overflow: hidden;
}
.ppty-output {
}

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@ -1,11 +0,0 @@
.gl-canvas-bg {
display:block;
width: 100vw;
height: 100vh;
position: fixed;
left: 0;
top: 0;
z-index: -1;
}

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@ -1,3 +1,27 @@
body {
background-color: var(--theme-bg);
}
#bg-canvas {
display:block;
position: fixed;
inset: 0;
width: 100vw;
height: 100vh;
z-index: -1;
}
.centered {
position: absolute;
inset: 0 0 0 0;
margin: auto;
display: flex;
}
.heading {
font-family: monospace;
font-size: 2em;
font-weight: bold;
}

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@ -10,7 +10,6 @@
font-family: monospace;
font-size: 2em;
font-weight: bold;
color: #ffc0cb; /* #ac4aed */
}
/* =========================================================== *
@ -19,100 +18,97 @@
#typing-wrapper {
margin: auto auto;
/* width: 71ch; /* prompt + command + cursor length */
/* height: 21ch; */
text-align: start;
border: 0.5ch solid #ffc0cb; /* #ac4aed */
border: 0.5ch solid var(--theme-tty-border); /* #ac4aed */
background-color: var(--theme-bg);
padding: 20px;
overflow: hidden;
/* overflow: hidden; */
display: flex;
flex-direction: column;
justify-content: start;
align-content: center;
align-items: start;
animation: kfs-ending 2s 10s forwards;
/* animation: kfs-ending 2s 10s forwards; */
}
#typing-prompt {
color: var(--theme-tty-prompt);
width: 10ch; /* prompt + command length */
animation: kfs-typing 0.5s steps(4), kfs-cursor-blink 1.2s steps(1, start) 0.6s forwards;
/* width: 10ch; /* prompt + command length */ */
/* animation: kfs-typing 0.5s steps(4), kfs-cursor-blink 1.2s steps(1, start) 0.6s forwards; */
white-space: nowrap;
overflow: hidden;
/* overflow: hidden; */
border-right: 1ch solid;
margin-bottom: 0.5ch;
}
#typing-result {
color: var(--theme-tty-warning);
/* "4.8s" means the result is shown 1.8s after typing ends */
animation: unhide 1s 1.8s forwards;
visibility: hidden;
/* animation: unhide 1s 1.8s forwards; */
/* visibility: hidden; */
white-space: nowrap; /* preserve linebreaks */
}
#typing-prompt-segfault {
color: var(--theme-tty-prompt);
width: 47ch; /* prompt + command length */
/* width: 47ch; /* prompt + command length */
/* animation: kfs-typing-segfault 3s steps(36) 2.6s, cursor-blink 0.6s steps(1, start) 3s infinite alternate; */
animation: kfs-typing-segfault 3s steps(36) 4s forwards, cursor-blink-segfault 0.6s steps(1, start) 7.1s infinite alternate;
/* animation: kfs-typing-segfault 3s steps(36) 4s forwards, cursor-blink-segfault 0.6s steps(1, start) 7.1s infinite alternate; */
white-space: nowrap;
overflow: hidden;
/* overflow: hidden; */
border-right: 1ch solid;
margin-bottom: 0.5ch;
visibility: hidden;
/* visibility: hidden; */
}
#typing-result-segfault {
/* "4.8s" means the result is shown 1.8s after typing ends */
animation: unhide 1s 8.3s forwards;
visibility: hidden;
/* animation: unhide 1s 8.3s forwards; */
/* visibility: hidden; */
white-space: nowrap; /* preserve linebreaks */
}
@keyframes kfs-typing {
from {
width: 6ch; /* ignore prompt width */
}
}
/* @keyframes kfs-typing { */
/* from { */
/* width: 6ch; /* ignore prompt width */ */
/* } */
/* } */
@keyframes kfs-typing-segfault {
from {
width: 11ch; /* ignore prompt width */
visibility: visible;
}
25% {
width: 11ch;
}
to {
visibility: visible;
}
}
/* @keyframes kfs-typing-segfault { */
/* from { */
/* width: 11ch; /* ignore prompt width */ */
/* visibility: visible; */
/* } */
/* 25% { */
/* width: 11ch; */
/* } */
/* to { */
/* visibility: visible; */
/* } */
/* } */
@keyframes kfs-cursor-blink {
from {
border-color: transparent;
}
50% {
border-color: currentColor;
}
to {
border-color: transparent;
}
}
/* @keyframes kfs-cursor-blink { */
/* from { */
/* border-color: transparent; */
/* } */
/* 50% { */
/* border-color: currentColor; */
/* } */
/* to { */
/* border-color: transparent; */
/* } */
/* } */
@keyframes cursor-blink-segfault {
50% {
border-color: transparent;
}
}
/* @keyframes cursor-blink-segfault { */
/* 50% { */
/* border-color: transparent; */
/* } */
/* } */
@keyframes unhide {
to {
visibility: visible;
}
}
/* @keyframes unhide { */
/* to { */
/* visibility: visible; */
/* } */
/* } */

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@ -12,42 +12,54 @@
<!-- Styling -->
<link type="text/css" rel="stylesheet" href="css/style.css">
<link type="text/css" rel="stylesheet" href="css/shader-style.css">
<link type="text/css" rel="stylesheet" href="css/typing.css">
<link type="text/css" rel="stylesheet" href="css/ppty.css">
</head>
<body>
<canvas class="gl-canvas-bg" id="gl-canvas"></canvas>
<!-- ShadeMyCanvas (background) -->
<canvas id="bg-canvas"></canvas>
<!-- Psuedo-Pseudo-Terminal -->
<div class="centered heading">
<div id="typing-wrapper">
<div id="typing-prompt">
grub> <span class="theme-tty-command">boot</span>
</div>
<div id="typing-result"> <!-- class="theme-tty-warning"> -->
ERROR: Root device mounted successfully, but /sbin/init does not exist.<br/><br/>
<i class="theme-tty-error">
Bailing out, you are on your own.<br/>
Good luck
</i><br/><br/>
sh: can't access tty; job control turned off<br/><br/>
</div>
<div id="typing-prompt-segfault">
[rootfs ]# <span class="theme-tty-command">do butterflies cry when they're sad?</span>
</div>
<div id="typing-result-segfault">
<i class="theme-tty-error">
Segmentation fault (core dumped)
</i>
</div>
<div class="ppty" id="boot-ppty">
<div class="ppty-block">
<div class="ppty-prompt">
grub>
</div>
<div class="ppty-command">
boot
</div>
<div class="ppty-output theme-tty-warning">
ERROR: Root device mounted successfully, but /sbin/init does not exist.<br/><br/>
<i class="theme-tty-error">
Bailing out, you are on your own.<br/>
Good luck<br/><br/>
</i>
sh: can't access tty; job control turned off<br/><br/>
</div>
</div>
<div class="ppty-block">
<div class="ppty-prompt">
[rootfs ]#
</div>
<div class="ppty-command">
do butterflies cry when they're sad?
</div>
<div class="ppty-output">
<i class="theme-tty-error">
Segmentation fault (core dumped)
</i>
</div>
</div>
</div>
</div>

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@ -1,24 +1,59 @@
import { Smc } from "./smc/smc.js"
import { Smc, fetchShader } from "./smc/lib.js";
import { PPTY } from "./ppty/lib.js";
main();
async function fetchShader(uri, delegate) {
const res = await fetch(uri);
if (res.ok)
return await res.text();
this.raiseError(
SmcErr.FETCH_SHADER,
`Failed to load shader source ${url}: ${res.status} ${res.json()}`);
return ""
function endBoot(root) {
const style = getComputedStyle(root);
const paddingLeft = parseFloat(style.paddingLeft);
const paddingRight = parseFloat(style.paddingRight);
const contentWidth = root.clientWidth - paddingLeft - paddingRight;
const paddingTop = parseFloat(style.paddingTop);
const paddingBottom = parseFloat(style.paddingBottom);
const contentHeight = root.clientHeight - paddingTop - paddingBottom;
root.style.width = `${contentWidth}px`;
root.style.height = `${contentHeight}px`;
const fade = root.animate(
[{ opacity: 0 }],
{
duration: 400,
delay: 3000,
fill: "forwards",
}
);
fade.onfinish = () => root.remove();
}
function main() {
const canvas = document.querySelector("#gl-canvas");
const boot = document.querySelector("#boot-ppty")
new PPTY(
boot,
[
{
cps: 12,
promptDelay: 0.5,
commandDelay: 0.7,
outputDelay: 1,
blinkTime: 0.6,
},
{
cps: 10,
promptDelay: 0,
commandDelay: 1.5,
outputDelay: 1.2,
blinkTime: 0.6,
}
])
.onfinish(endBoot)
.run();
const canvas = document.querySelector("#bg-canvas");
canvas.setAttribute('width', window.innerWidth);
canvas.setAttribute('height', window.innerHeight);
fetchShader("../shaders/segfault.glsl")
.then(frag =>
new Smc(canvas)

133
www/js/main.js.bak Normal file
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@ -0,0 +1,133 @@
import { Smc } from "./smc/lib.js"
main();
async function fetchShader(uri, delegate) {
const res = await fetch(uri);
if (res.ok)
return await res.text();
this.raiseError(
SmcErr.FETCH_SHADER,
`Failed to load shader source ${url}: ${res.status} ${res.json()}`);
return ""
}
function animDelta(anim) {
const timing = anim.effect.getComputedTiming();
return (timing.delay ?? 0) + (timing.duration ?? 0) + (timing.endDelay ?? 0);
}
function main() {
const cps = 12; // chars per second
const promptDelay = 0.5;
const commandDelay = 5;
const outputDelay = 5;
const blinkTime = 600; // x2 then x1000
// WARNING: delay does not account for runtime
// WARNING: it assumes all computations are down instantaneously
var delay = 0;
const boot = document.querySelector("#boot-ppty");
// WARNING: ensure boot != null
boot
.querySelectorAll(".ppty-block")
.forEach((block, index, blocks) => {
const prompt = block.querySelector(".ppty-prompt");
const command = block.querySelector(".ppty-command");
const output = block.querySelector(".ppty-output");
// WARNING: ensure prompt|command|output != null
const promptAnim = prompt.animate(
[{ visibility: "visible" }],
{
delay: delay + promptDelay * 1000,
fill: "forwards",
},
);
delay = animDelta(promptAnim);
const showCursor = () => { command.style.borderRightColor = cursorColor; return true; };
const hideCursor = () => { command.style.borderRightColor = "transparent"; return false; };
const startCursorBlink = () => setInterval(() => {
cursorVisible = cursorVisible ? hideCursor() : showCursor();
}, blinkTime);
const cursorColor = command.style.borderRightColor;
var cursorVisible = true;
var blinkId = null;
setTimeout(() => {
command.style.visibility = "visible";
blinkId = startCursorBlink();
}, delay);
// WARNING: ensure command.textContent != null
const commandLen = command.textContent.trim().length
const commandAnim = command.animate(
[
{
width: "0ch",
visibility: "visible",
},
{
width: `${commandLen}ch`,
visibility: "visible",
}
],
{
duration: commandLen / cps * 1000,
delay: delay + commandDelay * 1000,
easing: `steps(${commandLen}, end)`,
fill: "forwards",
}
);
// pause the cursor while typing
setTimeout(() => {
clearInterval(blinkId);
showCursor();
cursorVisible = true;
}, delay + commandDelay * 1000);
delay = animDelta(commandAnim);
setTimeout(() => {
blinkId = startCursorBlink();
}, delay);
setTimeout(() => {
clearInterval(blinkId);
hideCursor();
}, delay + outputDelay * 1000);
// unhide output
output.animate(
[{ visibility: "visible" }],
{
delay: delay + outputDelay * 1000,
fill: "forwards",
}
);
delay += outputDelay * 1000;
// hide the cursor after output displays
setTimeout(() => command.style.borderRightColor = "transparent", delay);
});
const canvas = document.querySelector("#bg-canvas");
canvas.setAttribute('width', window.innerWidth);
canvas.setAttribute('height', window.innerHeight);
fetchShader("../shaders/segfault.glsl")
.then(frag =>
new Smc(canvas)
.setMaxFps(30)
.setProgram(builder =>
builder
.addFragmentShader(frag))
.run()
);
}

2
www/js/ppty/lib.js Normal file
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@ -0,0 +1,2 @@
import { PPTY } from "./ppty.js";
export { PPTY };

130
www/js/ppty/ppty.js Normal file
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@ -0,0 +1,130 @@
export { PPTY };
function animDelta(anim) {
const timing = anim.effect.getComputedTiming();
return (timing.delay ?? 0) + (timing.duration ?? 0) + (timing.endDelay ?? 0);
}
class PPTY {
#root;
#blockOptions;
#startCallback = _ => { };
#finishCallback = _ => { };
constructor(root, blockOptions) {
this.#root = root;
this.#blockOptions = blockOptions;
}
onstart(handler) {
this.#startCallback = handler;
return this;
}
onfinish(handler) {
this.#finishCallback = handler;
return this;
}
run() {
var delay = 0;
this.#startCallback(this.#root);
this.#root
.querySelectorAll(".ppty-block")
.forEach((block, index, blocks) => {
const prompt = block.querySelector(".ppty-prompt");
const command = block.querySelector(".ppty-command");
const output = block.querySelector(".ppty-output");
const options = this.#blockOptions[index];
const cps = options["cps"]; // chars per second
const promptDelay = options["promptDelay"] * 1000;
const commandDelay = options["commandDelay"] * 1000;
const outputDelay = options["outputDelay"] * 1000;
const blinkTime = options["blinkTime"] * 2 * 1000; // x2 then x1000
// WARNING: ensure prompt|command|output != null
const promptAnim = prompt.animate(
[{ visibility: "visible" }],
{
delay: delay + promptDelay,
fill: "forwards",
},
);
delay = animDelta(promptAnim);
const showCursor = () => { command.style.borderRightColor = cursorColor; return true; };
const hideCursor = () => { command.style.borderRightColor = "transparent"; return false; };
const startCursorBlink = () => setInterval(() => {
cursorVisible = cursorVisible ? hideCursor() : showCursor();
}, blinkTime);
const cursorColor = command.style.borderRightColor;
var cursorVisible = true;
var blinkId = null;
setTimeout(() => {
command.style.visibility = "visible";
blinkId = startCursorBlink();
}, delay);
// WARNING: ensure command.textContent != null
const commandLen = command.textContent.trim().length
const commandAnim = command.animate(
[
{
width: "0ch",
visibility: "visible",
},
{
width: `${commandLen}ch`,
visibility: "visible",
}
],
{
duration: commandLen / cps * 1000,
delay: delay + commandDelay,
easing: `steps(${commandLen}, end)`,
fill: "forwards",
}
);
// pause the cursor while typing
setTimeout(() => {
clearInterval(blinkId);
showCursor();
cursorVisible = true;
}, delay + commandDelay);
delay = animDelta(commandAnim);
setTimeout(() => {
blinkId = startCursorBlink();
}, delay);
// delay until output is visible
delay += outputDelay;
setTimeout(() => {
clearInterval(blinkId);
hideCursor();
}, delay);
// unhide output
output.animate(
[{ visibility: "visible" }],
{
delay: delay,
fill: "forwards",
}
);
// hide the cursor after output displays and run the callback
setTimeout(() => {
command.style.borderRightColor = "transparent";
if (index == blocks.length - 1)
this.#finishCallback(this.#root);
}, delay);
});
}
}

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@ -1,4 +1,14 @@
import { Smc } from "./smc.js";
import { SmcErr } from "./errors.js";
export { Smc, SmcErr };
export { Smc, SmcErr, fetchShader };
async function fetchShader(uri, delegate) {
const res = await fetch(uri);
if (res.ok)
return await res.text();
this.raiseError(
SmcErr.FETCH_SHADER,
`Failed to load shader source ${url}: ${res.status} ${res.json()}`);
return ""
}

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@ -164,10 +164,11 @@ class Smc {
var delta = time - this.#prevTimeMs;
this.render(time, delta);
setTimeout(
() => requestAnimationFrame(this.renderLoop),
Math.max(0, delta - this.#minDeltaTimeMs)
);
requestAnimationFrame(this.renderLoop);
// setTimeout(
// () => requestAnimationFrame(this.renderLoop),
// Math.max(0, delta - this.#minDeltaTimeMs)
// );
this.#prevTimeMs = time;
}

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@ -15,9 +15,8 @@ uniform float uTime;
uniform vec2 uResolution;
/* ==== Text Colouring ==== */
#define PHOSPHOR_COL vec4(196./255., 167./255., 231./255., 1.)
// #define BG_COL vec4(0.2, 0.0, 0.2, 0.5)
#define BG_COL vec4(14./255., 13./255., 20./255., 1.)
#define PHOSPHOR_COL vec4(224./255., 222./255., 244./255., 1.)
#define BG_COL vec4(24./255., 23./255., 30./255., 1.)
/* ======= Text Size ======= */
#define FONT_SIZE vec2(10.,20.)
#define ROWCOLS vec2(80., 24.)