Introduction of Web games and asm.js, a limited and fast JavaScript subset, with which we can port C / C++ codes into JavaScript.

5. Open Source Project

6. Proudly non-profit, Mozilla makes products
like Firefox with a mission to keep the power
of the Web in the hands of users everywhere.
Mozilla Mission (https://www.mozilla.org/en-US/mission/)

7. To ensure the Internet is a global public
resource, open and accessible to all.
Mozilla Mission(https://www.mozilla.org/en-US/mission/)

8. Web is the platform

17. Games

25. window.addEventListener("gamepadconnected", function(e) {
console.log("Gamepad connected at index %d: %s. %d buttons, %d axes.",
e.gamepad.index, e.gamepad.id,
e.gamepad.buttons.length, e.gamepad.axes.length);
});
window.addEventListener("gamepaddisconnected", function(e) {
console.log("Gamepad disconnected from index %d: %s",
e.gamepad.index, e.gamepad.id);
});

26. function pollGamepads() {
var gamepads = navigator.getGamepads() || [];
for (var i = 0; i < gamepads.length; i++) {
var gp = gamepads[i];
if (gp) {
gamepadInfo.innerHTML = "Gamepad connected at index " + gp.index + ": " + gp.id +
". It has " + gp.buttons.length + " buttons and " + gp.axes.length + " axes.";
gameLoop();
clearInterval(interval);
}
}
}

34. var x = 42;
var y = "a string";
var z = x + y; // z = "42a string"
eval("z = z.substr(1, 2)"); // z = "2a"
[1, "two", { three: 3 }].forEach(function(item) {
if (typeof item === typeof z) console.log([z, item]);
}); // emits ["2a", "two"]

36. function fib(n){
if(n < 2){
return 1;
}
return fib(n - 1) + fib(n - 2);
}

37. function fib(n){
if(n < 2){
return 1;
}
return fib(n - 1) + fib(n - 2);
}
function fib(n) {
n = n|0;
if(n >>> 0 < 3){
return 1 | 0;
}
return ((fib(n - 1 | 0) | 0) + (fib(n - 2 | 0) | 0)) | 0;
}

41. int func(int *p) {
int r = *p;
return calc(r, r << 16);
}
function func(p) {
var r = HEAP32[p >> 2];
return calc(r, r << 16);
}

42. float array[5000]; // C++
int main() {
for (int i = 0; i < 5000; ++i) {
array[i] += 1.0f;
}
}

43. float array[5000]; // C++
int main() {
for (int i = 0; i < 5000; ++i) {
array[i] += 1.0f;
}
}
var buffer = new ArrayBuffer(32768); // JavaScript
var HEAPF32 = new Float32Array(buffer);
function main() {
var a = 0, b = 0;
do {
a = (8 + (b << 2)) | 0;
HEAPF32[a >> 2] = +HEAPF32[a >> 2] + 1.0;
b = (b + 1) | 0;
} while ((b | 0) < 5000);
}

47. -rw-r--r-- 1 chiko staff 99B 12 22 17:38 Makefile
-rw-r--r-- 1 chiko staff 1.9K 12 22 17:29 app.js
-rw-r--r-- 1 chiko staff 247B 12 22 11:31 fib-asm.js
-rw-r--r-- 1 chiko staff 220B 12 21 17:36 fib.cpp
-rw-r--r-- 1 chiko staff 184K 12 22 17:38 fib.js
-rw-r--r-- 1 chiko staff 2.8K 12 22 17:38 fib.js.mem
-rw-r--r-- 1 chiko staff 1.2K 12 22 17:10 index.html

51. function () {
"use asm";
function add(x, y) {
x = x | 0;
y = y | 0;
return x + y | 0;
}
return { add: add };
}

52. (module
(memory 16777216 16777216)
(export "add" $add)
(func $add (param $x i32) (param $y i32) (result i32)
(i32.add
(get_local $x)
(get_local $y)
)
)
)

54. Thank you & Questions?

55. MozVR