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我想要基準測試iOS本機可以在幀刷新與HTML5/JavaScript之間繪製的次數。測量iOS每幀可以繪製多少次
使用該JavaScript我得到一個號碼可以多次瀏覽器如何能在33毫秒(30赫茲)中得出:
var ctx = document.getElementById('canvas').getContext('2d');
var img = document.getElementById('img');
var draw = function(load) {
var angle = 0.01;
ctx.clearRect(0,0,400,400);
ctx.save();
ctx.translate(200,200);
for (var i=0; i<load; i++) {
ctx.rotate(angle);
ctx.drawImage(img, 0, 0);
}
ctx.restore();
};
var t, previousTime;
var drawLoad = 1;
var slowCount = 0;
var maxSlow = 10;
var requestAnimationFrame = window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame;
t = previousTime = Date.now();
var tick = function() {
var maximumFrameTime = 1000/30; // 30 FPS
t = Date.now();
var elapsed = t - previousTime;
previousTime = t;
if (elapsed < maximumFrameTime || slowCount < maxSlow) {
if (elapsed < maximumFrameTime) {
drawLoad+=10;
} else {
slowCount++;
}
draw(drawLoad);
requestAnimationFrame(tick);
} else {
// found maximum sustainable load at 30 FPS
document.getElementById('res').innerHTML = ("could draw "+(drawLoad)+" in " + maximumFrameTime + " ms");
}
};
requestAnimationFrame(tick);
與HTML的標記完整代碼見http://jsfiddle.net/tbhZs/117/。
我已經在objective-c中弄亂了,卻沒有找到公平的方式來獲得可比數字。有沒有辦法在iOS中本地生成可比較的基準測試?
但它不是我想捕捉的FPS。這是iOS可以在屏幕更新之間繪製多少次。 – Andain 2013-04-22 18:04:44