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var ReReReRe = function() {
$("#nojs").remove();
var res = [window.innerWidth, window.innerHeight];
var canvas = $("<canvas />").attr("width", res[0]).attr("height", res[1]).css("position", "absolute").css("width", "100%").css("height", "100%").appendTo($("body"));
var context = canvas[0].getContext("2d");
var sources = [];
var actives = [];
var supportedGCO = (function getGCOModes() {
var ctx = document.createElement('canvas').getContext('2d');
//var gCO = ["source-over", "source-in", "source-out", "source-atop", "destination-over", "destination-in", "destination-out", "destination-atop", "lighter", "copy", "xor", "multiply", "screen", "overlay", "darken", "color-dodge", "color-burn", "hard-light", "soft-light", "difference", "exclusion", "hue", "saturation", "color", "luminosity"];
var gCO = ["destination-atop", "lighter", "copy", "xor", "multiply", "screen", "overlay", "darken", "color-dodge", "color-burn", "hard-light", "soft-light", "difference", "exclusion", "hue", "saturation", "color", "luminosity"];
return gCO.filter(function(g) {
ctx.globalCompositeOperation = g;
return ctx.globalCompositeOperation === g;
});
})();
var enabledGCO = {};
supportedGCO.forEach(function(val) {
var item = $("<label />");
var input = $("<input />", {id: "blend"+val}).attr("type", "checkbox").attr("checked", "checked");
input.click(function(){
enabledGCO[val] = $(this).prop("checked");
});
item.append(input);
item.append(val);
enabledGCO[val] = true;
$("#blendtypes").append(item).append("<br />");
});
function randomBoolean() {
return (Math.random() > 0.5);
}
function randomInt(max) {
return Math.floor(Math.random()*max);
}
function randomPosition(wo, ho) {
if (wo && ho) {
xmax = res[0] - wo;
ymax = res[1] - ho;
} else {
xmax = res[0];
ymax = res[1];
}
return [Math.floor(xmax*Math.random()), Math.floor(ymax*Math.random())];
}
function randomSource() {
return sources[Math.floor((sources.length - 1)*Math.random())]
}
function randomGCO() {
var gcos = [];
for (var k in enabledGCO) {
if (enabledGCO[k]) gcos.push(k);
}
return gcos[Math.floor((gcos.length - 1)*Math.random())];
}
var Source = function() {
var self = this;
var src = randomSource();
var staging = null;
var scontext = null;
var size = null;
var blitpos = null;
var gcotype = null;
this.ready = false;
var refreshing = false;
function refresh() {
refreshing = true;
var img = new Image();
img.src = src;
img.onload = function() {
if (!size) size = [this.width, this.height];
if (!staging) staging = $("<canvas />").attr("width", size[0]).attr("height", size[1]);
if (!scontext) scontext = staging[0].getContext("2d");
scontext.clearRect(0, 0, size[0], size[1]);
scontext.drawImage(img, 0, 0, size[0], size[1]);
self.ready = true;
this.onload = null;
refreshing = false;
}
setTimeout(function(){
delete img;
}, 90);
}
this.blit = function() {
if (!staging) return;
if (!gcotype) gcotype = randomGCO(); //context.globalCompositeOperation = randomGCO();
context.globalCompositeOperation = gcotype;
//context.globalAlpha = (Math.random()/2) + 0.5;
if (!blitpos) blitpos = randomPosition(size[0], size[1]);
context.drawImage(staging[0], blitpos[0], blitpos[1], size[0], size[1]);
self.ready = false;
if (!refreshing) refresh();
};
refresh();
};
function step() {
var anyready = false;
actives.forEach(function(a){
if (a.ready) {
anyready = true;
}
});
if (anyready) {
context.clearRect(0, 0, res[0], res[1]);
actives.forEach(function(a){
a.blit();
});
}
setTimeout(step, 110);
}
function start() {
for (var x = 0; x < randomInt(5)+2; x++) {
actives.push(new Source());
}
step();
}
$.ajax({
dataType: "json",
url: "sources.json",
success: function(response) {
sources = response.data;
start();
}
});
};
$(function(){
window.rererere = new ReReReRe();
});
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