Adding GameTime. Time since app start that pauses with director.

[funinvegas]

getGameTime will return ms since app start, and won't increment when the app is paused.
Useful for replacing goog.now() calls or Date.now() calls for time path, while preventing pause-cheats.

Minor other fixes.

[funinvegas]

This change also includes a change to node.js to skip updating hidden objects. The caller to update also doesn't force the dirty_ flag to 0 after calling update for two reasons. 1: update already did this. and 2: this allows the skip of hidden elements to be safer because they will still be dirty when they are ever shown again.

[tonistiigi]

camelCase

[funinvegas]

I'll make the recommended fixes and create another pull request tonight.

[tonistiigi]

You can just commit your changes to the same branch and this page will pick it up.

[funinvegas]

Per your request I tested delta vs getGameTime. they are off by about 460ms to start, probably because my delta function doesn't schedule itself early enough.

After that, pausing and resuming seem to cause a difference of about 2ms in delta's favor. Also, calls to lime.updateDirtyObjects() which I call on window resize while the pause screen is open seems to add 1-3ms to delta, and not to getGameTime.

Probably a matter of preference on which is "correct".

[tonistiigi]

That is a problem. Not sure what causes the difference but maybe we should use a different technique then and sum up all the deltas in schedulemanager. getGameTime() would then return this sum + performance.timing.domComplete. If these numbers are not correct all the time you can't rely on them in your game.

[funinvegas]

Ok, I can change it to also use sum.

Btw, I wouldn't be offended if you just don't want this change. I can move it out of director and into some other global for my local game. It doesn't have to be part of limejs if you don't like it.

[tonistiigi]

Closing this now because there doesn't seem to be any getGameTime() related code left. Reopen when you have some.