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function EventListener() {
this.listeners = {};
this.addEventListener = function(event, func) {
if (!this.listeners[event]) this.listeners[event] = [];
this.listeners[event].push(func);
};
this.fireEvent = function(event) {
event.preventDefault = function(){};
if (event.type in this.listeners) {
this.listeners[event.type].forEach(function(listener) {
listener(event);
});
}
};
};
var window = this;
var windowExtra = new EventListener();
for (var x in windowExtra) window[x] = windowExtra[x];
window.close = function() {
postMessage({ target: 'window', method: 'close' });
};
var document = new EventListener();
document.createElement = function(what) {
switch(what) {
case 'canvas': {
var canvas = new EventListener();
canvas.ensureData = function() {
if (!canvas.data || canvas.data.width !== canvas.width || canvas.data.height !== canvas.height) {
canvas.data = {
width: canvas.width,
height: canvas.height,
data: new Uint8Array(canvas.width*canvas.height*4)
};
postMessage({ target: 'canvas', op: 'resize', width: canvas.width, height: canvas.height });
}
};
canvas.getContext = function(type) {
assert(type == '2d');
return {
getImageData: function(x, y, w, h) {
assert(x == 0 && y == 0 && w == canvas.width && h == canvas.height);
canvas.ensureData();
return {
width: canvas.data.width,
height: canvas.data.height,
data: new Uint8Array(canvas.data.data) // TODO: can we avoid this copy?
};
},
putImageData: function(image, x, y) {
canvas.ensureData();
assert(x == 0 && y == 0 && image.width == canvas.width && image.height == canvas.height);
canvas.data.data.set(image.data); // TODO: can we avoid this copy?
postMessage({ target: 'canvas', op: 'render', image: canvas.data });
}
};
};
return canvas;
}
default: throw 'document.createElement ' + what;
}
};
var console = {
log: function(x) {
Module.printErr(x);
}
};
Module.canvas = document.createElement('canvas');
Module.setStatus = function(){};
Module.print = function(x) {
postMessage({ target: 'stdout', content: x });
};
Module.printErr = function(x) {
postMessage({ target: 'stderr', content: x });
};
// buffer messages until the program starts to run
var messageBuffer = null;
function messageResender() {
if (calledMain) {
assert(messageBuffer && messageBuffer.length > 0);
messageBuffer.forEach(function(message) {
onmessage(message);
});
messageBuffer = null;
} else {
setTimeout(messageResender, 100);
}
}
onmessage = function(message) {
if (!calledMain) {
if (!messageBuffer) {
messageBuffer = [];
setTimeout(messageResender, 100);
}
messageBuffer.push(message);
}
switch (message.data.target) {
case 'document': {
document.fireEvent(message.data.event);
break;
}
case 'window': {
window.fireEvent(message.data.event);
break;
}
case 'canvas': {
Module.canvas.fireEvent(message.data.event);
break;
}
default: throw 'wha? ' + message.data.target;
}
};
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