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chip8.html
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chip8.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Chip8 Emulator</title>
<style>
body {
font-family: arial;
margin: 0;
padding: none;
}
.emscripten { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
div.emscripten { text-align: center; }
div.emscripten_border { border: 1px solid black; }
/* the canvas *must not* have any border or padding, or mouse coords will be wrong */
canvas.emscripten { border: 0px none; background-color: black; }
#emscripten_logo {
display: inline-block;
margin: 0;
}
.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 {
display: inline-block;
float: right;
vertical-align: top;
margin-top: 30px;
margin-right: 20px;
}
</style>
</head>
<body>
<input type="file" id="rom" />
Instructions per step: <input type="text" id="speed" />
<div class="spinner" id='spinner'></div>
<div class="emscripten" id="status">Downloading...</div>
<span id='controls'>
<span><input type="button" value="Fullscreen" onclick="Module.requestFullscreen(true, false)"> </span>
</span>
<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>
<script type='text/javascript'>
var statusElement = document.getElementById('status');
var progressElement = document.getElementById('progress');
var spinnerElement = document.getElementById('spinner');
var Module = {
noInitialRun: true,
preRun: [],
postRun: [],
print: function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
console.log(text);
},
printErr: function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
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) {
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>
(function() {
var memoryInitializer = 'chip8.js.mem';
if (typeof Module['locateFile'] === 'function') {
memoryInitializer = Module['locateFile'](memoryInitializer);
} else if (Module['memoryInitializerPrefixURL']) {
memoryInitializer = Module['memoryInitializerPrefixURL'] + memoryInitializer;
}
var meminitXHR = Module['memoryInitializerRequest'] = new XMLHttpRequest();
meminitXHR.open('GET', memoryInitializer, true);
meminitXHR.responseType = 'arraybuffer';
meminitXHR.send(null);
})();
var script = document.createElement('script');
script.src = "chip8.js";
document.body.appendChild(script);
</script>
<script type="text/javascript">
function loadROM(event) {
var f = event.target.files[0];
if (f) {
var r = new FileReader();
r.onload = function(e) {
var contents = e.target.result;
var file_name = document.getElementById("rom").files[0].name;
FS.writeFile(file_name, new Uint8Array(contents), {encoding: "binary"});
// Make sure any saved games are loaded before running
FS.syncfs(true, function(err) {
if (err) {
console.error(err);
} else {
Module.callMain([file_name]);
setSpeed();
}
});
}
r.readAsArrayBuffer(f);
document.getElementById("rom").style.display = "none";
document.getElementById("controls").style.display = "block";
}
else {
alert("failed to load file\n");
}
}
function preloadROM() {
var searchParams = new URLSearchParams(window.location.search);
var romUrl = searchParams.get("rom");
if (romUrl == null)
return;
var req = new XMLHttpRequest();
req.open("GET", romUrl);
req.responseType = "arraybuffer";
req.onload = function() {
if (this.status != 200)
alert(this.status + " " + this.statusText + ": Error loading ROM from " + romUrl);
var contents = this.response;
console.log(contents);
var file_name = "chip8_rom";
FS.writeFile(file_name, new Uint8Array(contents), {encoding: "binary"});
// Make sure any saved games are loaded before running
FS.syncfs(true, function(err) {
if (err) {
console.error(err);
} else {
Module.callMain([file_name]);
setSpeed();
}
});
};
req.send();
document.getElementById("rom").style.display = "none";
document.getElementById("controls").style.display = "block";
}
function updateSpeed() {
var n = document.getElementById("speed").value;
Module.ccall('set_instructions_per_step', 'void', '[number]', [n]);
}
function setSpeed() {
var searchParams = new URLSearchParams(window.location.search);
var speed = searchParams.get("speed");
if (speed == null)
speed = "10";
document.getElementById("speed").value = speed;
updateSpeed();
}
document.getElementById("speed").addEventListener("input", updateSpeed, false);
document.getElementById("rom").addEventListener("change", loadROM, false);
window.addEventListener("load", preloadROM, false);
</script>
</body>
</html>