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var Recorder = (function() {
var recorder;
var init = 'reproduce=';
var initLocation = window.location.search.indexOf(init);
var replaying = initLocation >= 0;
var raf = window['requestAnimationFrame'] ||
window['mozRequestAnimationFrame'] ||
window['webkitRequestAnimationFrame'] ||
window['msRequestAnimationFrame'] ||
window['oRequestAnimationFrame'];
if (!replaying) {
// Prepare to record
recorder = {};
// Start
recorder.frameCounter = 0; // the frame counter is used to know when to replay events
recorder.start = function() {
alert("Starting recording! Don't forget to Recorder.finish() afterwards!");
function count() {
recorder.frameCounter++;
raf(count);
}
count();
recorder.started = true;
};
// Math.random
recorder.randoms = [];
recorder.random = Math.random;
Math.random = function() {
var ret = recorder.random();
recorder.randoms.push(ret);
return ret;
};
// Date.now, performance.now
recorder.dnows = [];
recorder.dnow = Date.now;
Date.now = function() {
var ret = recorder.dnow();
recorder.dnows.push(ret);
return ret;
};
recorder.pnows = [];
var pnow = performance.now || performance.webkitNow || performance.mozNow || performance.oNow || performance.msNow;
recorder.pnow = function() { return pnow.call(performance) };
performance.now = function() {
var ret = recorder.pnow();
recorder.pnows.push(ret);
return ret;
};
// Events
recorder.devents = []; // document events
recorder.onEvent = function(which, callback) {
document['on' + which] = function(event) {
if (!recorder.started) return true;
event.frameCounter = recorder.frameCounter;
recorder.devents.push(event);
return callback(event); // XXX do we need to record the return value?
};
};
recorder.tevents = []; // custom-target events. Currently we assume a single such custom target (aside from document), e.g., a canvas for the game.
recorder.addListener = function(target, which, callback, arg) {
target.addEventListener(which, function(event) {
if (!recorder.started) return true;
event.frameCounter = recorder.frameCounter;
recorder.tevents.push(event);
return callback(event); // XXX do we need to record the return value?
}, arg);
};
// Finish
recorder.finish = function() {
// Reorder data because pop() is faster than shift()
recorder.randoms.reverse();
recorder.dnows.reverse();
recorder.pnows.reverse();
recorder.devents.reverse();
recorder.tevents.reverse();
// Make JSON.stringify work on data from native event objects (and only store relevant ones)
var importantProperties = {
type: 1,
movementX: 1, mozMovementX: 1, webkitMovementX: 1,
movementY: 1, mozMovementY: 1, webkitMovementY: 1,
detail: 1,
wheelDelta: 1,
pageX: 1,
pageY: 1,
button: 1,
keyCode: 1,
frameCounter: 1
};
function importantize(event) {
var ret = {};
for (var prop in importantProperties) {
if (prop in event) {
ret[prop] = event[prop];
}
}
return ret;
}
recorder.devents = recorder.devents.map(importantize);
recorder.tevents = recorder.tevents.map(importantize);
// Write out
alert('Writing out data, remember to save!');
setTimeout(function() {
document.open();
document.write(JSON.stringify(recorder));
document.close();
}, 0);
return '.';
};
} else {
// Load recording
var dataPath = window.location.search.substring(initLocation + init.length);
var baseURL = window.location.toString().replace('://', 'cheez999').split('?')[0].split('/').slice(0, -1).join('/').replace('cheez999', '://');
if (baseURL[baseURL.length-1] != '/') baseURL += '/';
var path = baseURL + dataPath;
alert('Loading replay from ' + path);
var request = new XMLHttpRequest();
request.open('GET', path, false);
request.send();
var raw = request.responseText;
raw = raw.substring(raw.indexOf('{'), raw.lastIndexOf('}')+1); // remove <html> etc
recorder = JSON.parse(raw);
// prepare to replay
// Start
recorder.frameCounter = 0; // the frame counter is used to know when to replay events
recorder.start = function() {
function count() {
recorder.frameCounter++;
raf(count);
// replay relevant events for this frame
while (recorder.devents.length && recorder.devents[recorder.devents.length-1].frameCounter <= recorder.frameCounter) {
var event = recorder.devents.pop();
recorder['on' + event.type](event);
}
while (recorder.tevents.length && recorder.tevents[recorder.tevents.length-1].frameCounter <= recorder.frameCounter) {
var event = recorder.tevents.pop();
recorder['event' + event.type](event);
}
}
count();
};
// Math.random
recorder.random = Math.random;
Math.random = function() {
if (recorder.randoms.length > 0) {
return recorder.randoms.pop();
} else {
recorder.finish();
throw 'consuming too many random values!';
}
};
// Date.now, performance.now
recorder.dnow = Date.now;
Date.now = function() {
if (recorder.dnows.length > 0) {
return recorder.dnows.pop();
} else {
recorder.finish();
throw 'consuming too many Date.now values!';
}
};
var pnow = performance.now || performance.webkitNow || performance.mozNow || performance.oNow || performance.msNow;
recorder.pnow = function() { return pnow.call(performance) };
performance.now = function() {
if (recorder.pnows.length > 0) {
return recorder.pnows.pop();
} else {
recorder.finish();
throw 'consuming too many performance.now values!';
}
};
// Events
recorder.onEvent = function(which, callback) {
recorder['on' + which] = callback;
};
recorder.eventCallbacks = {};
recorder.addListener = function(target, which, callback, arg) {
recorder['event' + which] = callback;
};
recorder.onFinish = [];
// Benchmarking hooks - emscripten specific
setTimeout(function() {
var totalTime = 0;
var totalSquared = 0;
var iterations = 0;
var maxTime = 0;
var curr = 0;
Module.preMainLoop = function() {
curr = recorder.pnow();
}
Module.postMainLoop = function() {
var time = recorder.pnow() - curr;
totalTime += time;
totalSquared += time*time;
maxTime = Math.max(maxTime, time);
iterations++;
};
recorder.onFinish.push(function() {
var mean = totalTime / iterations;
var meanSquared = totalSquared / iterations;
console.log('mean frame : ' + mean + ' ms');
console.log('frame std dev: ' + Math.sqrt(meanSquared - (mean*mean)) + ' ms');
console.log('max frame : ' + maxTime + ' ms');
});
});
// Finish
recorder.finish = function() {
recorder.onFinish.forEach(function(finish) {
finish();
});
};
}
recorder.replaying = replaying;
return recorder;
})();
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