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chip8.html
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<!doctype html>
<html lang="en-us">
<!--
You can pass parameters in the URL to control which game to play and
the color oof the foreground and background, eg:
chip8.html?background=002804&foreground=46EA74&game=GAMES/INVADERS.ch8
-->
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>CHIP-8 Emulator Wrapper</title>
<style>
body {
font-family: arial;
margin: 0;
padding: 0em 2em;
color: #646379;
}
.emscripten { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
div.emscripten { text-align: center; }
div.emscripten_border {
/*border: 1px solid #646379;
border-radius: 3px;
background-color:#EFEFF1; */
padding: 1em; }
/* the canvas *must not* have any border or padding, or mouse coords will be wrong */
canvas.emscripten { border: 0px none; }
.spinner {
height: 30px;
width: 30px;
margin: 0;
margin-top: 20px;
margin-left: 20px;
display: inline-block;
vertical-align: top;
-webkit-animation: rotation .8s linear infinite;
-moz-animation: rotation .8s linear infinite;
-o-animation: rotation .8s linear infinite;
animation: rotation 0.8s linear infinite;
border-left: 5px solid rgb(235, 235, 235);
border-right: 5px solid rgb(235, 235, 235);
border-bottom: 5px solid rgb(235, 235, 235);
border-top: 5px solid rgb(120, 120, 120);
border-radius: 100%;
background-color: rgb(189, 215, 46);
}
@-webkit-keyframes rotation {
from {-webkit-transform: rotate(0deg);}
to {-webkit-transform: rotate(360deg);}
}
@-moz-keyframes rotation {
from {-moz-transform: rotate(0deg);}
to {-moz-transform: rotate(360deg);}
}
@-o-keyframes rotation {
from {-o-transform: rotate(0deg);}
to {-o-transform: rotate(360deg);}
}
@keyframes rotation {
from {transform: rotate(0deg);}
to {transform: rotate(360deg);}
}
#status {
display: inline-block;
vertical-align: top;
margin-top: 30px;
margin-left: 20px;
font-weight: bold;
color: rgb(120, 120, 120);
}
#progress {
height: 20px;
width: 30px;
}
#controls {
position:absolute;
right:0em;
vertical-align: top;
margin-top: 30px;
margin-right: 20px;
}
#output {
width: 100%;
height: 200px;
margin: 0 auto;
margin-top: 10px;
border-left: 0px;
border-right: 0px;
padding-left: 0px;
padding-right: 0px;
display: block;
background-color: #0D210C;
color: #61C066;
font-family: 'Lucida Console', Monaco, monospace;
outline: none;
resize: none;
}
.button { border:1px solid #646379;
border-radius:3px;
cursor:pointer;
margin: 0.25em; padding:0.25em;
font-size: small; background-color:#EFEFF1;}
.button:hover { color: #EFEFF1; border:1px solid #EFEFF1;background-color:#646379;}
a:active {color:#646379;}
a:visited {color:#646379;}
th,td{padding:0.5em 0.75em;border:1px solid #000055;}
table{border-collapse:collapse;margin:0.5em;}
th{color:#646379;border:1px solid #646379;border-bottom:2px solid #646379;}
tr:nth-child(odd){background-color:#EFEFF1;}
</style>
</head>
<body>
<div id='controls'>
<span style="display:none;"><input type="checkbox" id="resize">Resize canvas</span>
<span style="display:none;"><input type="checkbox" id="pointerLock" checked>Lock/hide mouse pointer </span>
<span class="button" onclick="Module.requestFullscreen(document.getElementById('pointerLock').checked,
document.getElementById('resize').checked)">
Fullscreen
</span>
<span class="button" onclick="toggle('output')">Output</span>
<span class="button" onclick="toggle('help')">Help</span>
</div>
<div class="spinner" id='spinner'></div>
<div class="emscripten" id="status">Downloading...</div>
<div class="emscripten">
<progress value="0" max="100" id="progress" hidden=1></progress>
</div>
<div class="emscripten_border">
<canvas class="emscripten" id="canvas" oncontextmenu="event.preventDefault()"></canvas>
</div>
<textarea id="output" rows="8" style="display:none;"></textarea>
<div id="help" style="display:none;">
<p>This is the <a href="https://en.wikipedia.org/wiki/CHIP-8" title="">CHIP-8</a> interpreter compiled
with <a href="http://emscripten.org/" title="">Emscripten</a>.</p>
<p>The computers on which CHIP-8 originally ran had 16-key hexadecimal keyboards.
The keys are mapped to a Qwerty keyboard according to the following table:
</p>
<table>
<tr><th>CHIP-8 Key</th><th>Actual Key</th><th></th><th>CHIP-8 Key</th><th>Actual Key</th></tr>
<tr><td>0</td><td>'X'</td><td></td></td><td>8</td><td>'S'</td></tr>
<tr><td>1</td><td>'1'</td><td></td><td>9</td><td>'D'</td></tr>
<tr><td>2</td><td>'2'</td><td></td><td>A</td><td>'Z'</td></tr>
<tr><td>3</td><td>'3'</td><td></td><td>B</td><td>'C'</td></tr>
<tr><td>4</td><td>'Q'</td><td></td><td>C</td><td>'4'</td></tr>
<tr><td>5</td><td>'W'</td><td></td><td>D</td><td>'R'</td></tr>
<tr><td>6</td><td>'E'</td><td></td><td>E</td><td>'F'</td></tr>
<tr><td>7</td><td>'A'</td><td></td><td>F</td><td>'V'</td></tr>
</table>
</div>
<script type='text/javascript'>
var statusElement = document.getElementById('status');
var progressElement = document.getElementById('progress');
var spinnerElement = document.getElementById('spinner');
/* https://css-tricks.com/snippets/javascript/get-url-variables/ */
function getQueryVariable(variable) {
var query = window.location.search.substring(1);
var vars = query.split("&");
for (var i=0;i<vars.length;i++) {
var pair = vars[i].split("=");
if(pair[0] == variable){return pair[1];}
}
return(false);
}
function toggle(id) {
var output=document.getElementById(id);
output.style.display=(output.style.display=="none")?"block":"none";
}
var Module = {
preRun: [],
postRun: [],
arguments: ["-f", getQueryVariable("foreground") || "#AAAAFF",
"-b", getQueryVariable("background") || "#000055",
getQueryVariable("game") || "GAMES/CUBE8.ch8"],
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(' ');
// These replacements are necessary if you render to raw HTML
//text = text.replace(/&/g, "&");
//text = text.replace(/</g, "<");
//text = text.replace(/>/g, ">");
//text = text.replace('\n', '<br>', 'g');
console.log(text);
if (element) {
element.value += text + "\n";
element.scrollTop = element.scrollHeight; // focus on bottom
}
};
})(),
printErr: function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
if (0) { // XXX disabled for safety typeof dump == 'function') {
dump(text + '\n'); // fast, straight to the real console
} else {
console.error(text);
}
},
canvas: (function() {
var canvas = document.getElementById('canvas');
// As a default initial behavior, pop up an alert when webgl context is lost. To make your
// application robust, you may want to override this behavior before shipping!
// See http://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15.2
canvas.addEventListener("webglcontextlost", function(e) { alert('WebGL context lost. You will need to 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.text) return;
var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
var now = Date.now();
if (m && now - Date.now() < 30) return; // if this is a progress update, skip it if too soon
if (m) {
text = m[1];
progressElement.value = parseInt(m[2])*100;
progressElement.max = parseInt(m[4])*100;
progressElement.hidden = false;
spinnerElement.hidden = false;
} else {
progressElement.value = null;
progressElement.max = null;
progressElement.hidden = true;
if (!text) spinnerElement.style.display = 'none';
}
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.');
}
};
Module.setStatus('Downloading...');
window.onerror = function(event) {
// TODO: do not warn on ok events like simulating an infinite loop or exitStatus
Module.setStatus('Exception thrown, see JavaScript console');
spinnerElement.style.display = 'none';
Module.setStatus = function(text) {
if (text) Module.printErr('[post-exception status] ' + text);
};
};
</script>
<script async type="text/javascript" src="chip8.js"></script>
</body>
</html>