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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>WASM Canvas</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="https://twemoji.maxcdn.com/2/svg/1f5bc.svg" type="image/svg+xml">
<style>
html {
-webkit-font-smoothing: antialiased;
}
body {
display: grid;
place-items: center;
padding: 5vw;
font-family: system-ui, sans-serif, "Segoe UI Symbol", "Segoe UI Emoji", "Noto Color Emoji";
text-align: center;
}
h1 {
font-weight: 500;
margin-bottom: 0;
}
p {
margin-top: 0;
margin-bottom: 0;
max-width: 400px;
}
a {
text-decoration: none;
color: #0000cd;
}
a:hover {
opacity: 0.75;
}
canvas {
pointer-events: none;
margin-top: 16px;
max-width: 95%;
}
progress {
accent-color: mediumblue;
}
@media screen and (prefers-color-scheme: dark) {
:not(a, progress) {
background-color: #131313;
color: #ddd;
}
a {
color: #8ae2ff;
}
progress {
accent-color: royalblue;
}
}
</style>
</head>
<body>
<section id="info">
<div class="emscripten" id="status">Downloading…</div>
<progress value="0" max="100" id="progress"></progress>
</section>
<main>
<h1>SDL Gradient</h1>
<p><a href="about">Learn more →</a></p>
<canvas id="canvas" aria-description="Radial gradient"></canvas>
</main>
<script>
var statusElement = document.getElementById("status");
var progressElement = document.getElementById("progress");
var info = document.getElementById("info");
var Module = {
preRun: [],
postRun: [],
print: (function () {
var element = document.getElementById('output');
if (element) element.value = ''; // clear browser cache
return function (text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
console.log(text);
if (element) {
element.value += text + "\n";
element.scrollTop = element.scrollHeight; // focus on bottom
}
};
})(),
canvas: (function () {
var canvas = document.getElementById('canvas');
canvas.addEventListener("webglcontextlost", function (e) {
alert('WebGL context lost. Please reload the page.');
e.preventDefault();
}, false);
return canvas;
})(),
setStatus: function (text) {
if (!Module.setStatus.last) Module.setStatus.last = {
time: Date.now(),
text: ''
};
if (text === Module.setStatus.last.text) return;
var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
var now = Date.now();
if (m && now - Module.setStatus.last.time < 30) return; // if this is a progress update, skip it if too soon
Module.setStatus.last.time = now;
Module.setStatus.last.text = text;
if (m) {
text = m[1];
progressElement.value = parseInt(m[2]) * 100;
progressElement.max = parseInt(m[4]) * 100;
progressElement.hidden = false;
} else {
progressElement.value = null;
progressElement.max = null;
progressElement.hidden = true;
}
statusElement.innerHTML = text;
},
totalDependencies: 0,
monitorRunDependencies: function (left) {
this.totalDependencies = Math.max(this.totalDependencies, left);
Module.setStatus(left ? 'Preparing… (' + (this.totalDependencies - left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
info.setAttribute("aria-live", "off");
info.setAttribute("aria-hidden", "true");
}
};
Module.setStatus('Downloading…');
window.onerror = function (event) {
Module.setStatus('Exception thrown, please see your Javascript console for info.');
Module.setStatus = function (text) {
if (text) Module.printErr('[post-exception status] ' + text);
};
};
</script>
<script src="canvas.js" async></script>
</body>
</html>