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Copy pathAnimationLoop.js
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211 lines (177 loc) · 5.87 KB
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CAAT.Module({
defines:"CAAT.Event.AnimationLoop",
onCreate : function() {
/**
* @lends CAAT
*/
/**
* if RAF, this value signals end of RAF.
* @type {Boolean}
*/
CAAT.ENDRAF=false;
/**
* if setInterval, this value holds CAAT.setInterval return value.
* @type {null}
*/
CAAT.INTERVAL_ID=null;
/**
* Boolean flag to determine if CAAT.loop has already been called.
* @type {Boolean}
*/
CAAT.renderEnabled=false;
/**
* expected FPS when using setInterval animation.
* @type {Number}
*/
CAAT.FPS=60;
/**
* Use RAF shim instead of setInterval. Set to != 0 to use setInterval.
* @type {Number}
*/
CAAT.NO_RAF=0;
/**
* debug panel update time.
* @type {Number}
*/
CAAT.FPS_REFRESH=500;
/**
* requestAnimationFrame time reference.
* @type {Number}
*/
CAAT.RAF=0;
/**
* time between two consecutive RAF. usually bigger than FRAME_TIME
* @type {Number}
*/
CAAT.REQUEST_ANIMATION_FRAME_TIME=0;
/**
* time between two consecutive setInterval calls.
* @type {Number}
*/
CAAT.SET_INTERVAL=0;
/**
* time to process one frame.
* @type {Number}
*/
CAAT.FRAME_TIME=0;
/**
* Current animated director.
* @type {CAAT.Foundation.Director}
*/
CAAT.currentDirector=null;
/**
* Registered director objects.
* @type {Array}
*/
CAAT.director=[];
/**
* Register and keep track of every CAAT.Director instance in the document.
*/
CAAT.RegisterDirector=function (director) {
if (!CAAT.currentDirector) {
CAAT.currentDirector = director;
}
CAAT.director.push(director);
};
/**
* Return current scene.
* @return {CAAT.Foundation.Scene}
*/
CAAT.getCurrentScene=function () {
return CAAT.currentDirector.getCurrentScene();
};
/**
* Return current director's current scene's time.
* The way to go should be keep local scene references, but anyway, this function is always handy.
* @return {number} current scene's virtual time.
*/
CAAT.getCurrentSceneTime=function () {
return CAAT.currentDirector.getCurrentScene().time;
};
/**
* Stop animation loop.
*/
CAAT.endLoop=function () {
if (CAAT.NO_RAF) {
if (CAAT.INTERVAL_ID !== null) {
clearInterval(CAAT.INTERVAL_ID);
}
} else {
CAAT.ENDRAF = true;
}
CAAT.renderEnabled = false;
};
/**
* Main animation loop entry point.
* Must called only once, or only after endLoop.
*
* @param fps {number} desired fps. fps parameter will only be used if CAAT.NO_RAF is specified, that is
* switch from RequestAnimationFrame to setInterval for animation loop.
*/
CAAT.loop=function (fps) {
if (CAAT.renderEnabled) {
return;
}
for (var i = 0, l = CAAT.director.length; i < l; i++) {
CAAT.director[i].timeline = new Date().getTime();
}
CAAT.FPS = fps || 60;
CAAT.renderEnabled = true;
if (CAAT.NO_RAF) {
CAAT.INTERVAL_ID = setInterval(
function () {
var t = new Date().getTime();
for (var i = 0, l = CAAT.director.length; i < l; i++) {
var dr = CAAT.director[i];
if (dr.renderMode === CAAT.Foundation.Director.RENDER_MODE_CONTINUOUS || dr.needsRepaint) {
dr.renderFrame();
}
}
CAAT.FRAME_TIME = t - CAAT.SET_INTERVAL;
if (CAAT.RAF) {
CAAT.REQUEST_ANIMATION_FRAME_TIME = new Date().getTime() - CAAT.RAF;
}
CAAT.RAF = new Date().getTime();
CAAT.SET_INTERVAL = t;
},
1000 / CAAT.FPS
);
} else {
CAAT.renderFrameRAF();
}
};
CAAT.renderFrameRAF= function (now) {
var c= CAAT;
if (c.ENDRAF) {
c.ENDRAF = false;
return;
}
if (!now) now = new Date().getTime();
var t= new Date().getTime();
c.REQUEST_ANIMATION_FRAME_TIME = c.RAF ? now - c.RAF : 16;
for (var i = 0, l = c.director.length; i < l; i++) {
c.director[i].renderFrame();
}
c.RAF = now;
c.FRAME_TIME = new Date().getTime() - t;
window.requestAnimFrame(c.renderFrameRAF, 0);
};
/**
* Polyfill for requestAnimationFrame.
*/
window.requestAnimFrame = (function () {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function raf(/* function */ callback, /* DOMElement */ element) {
window.setTimeout(callback, 1000 / CAAT.FPS);
};
})();
},
extendsWith:function () {
return {
};
}
});