paint.js

// --- DOES NOT WORK
var repaint = function () {
    wrappedPaint(buf.byteOffset, w, h);
    imageData.data.set(buf);
    ctx.putImageData(imageData, 0, 0);
    window.requestAnimationFrame(repaint);
};

init();
repaint(true);

// --- WORKS
var repaint = function (isFirstCall) {
    if (isFirstCall) {
        init();
    }
    wrappedPaint(buf.byteOffset, w, h);
    imageData.data.set(buf);
    ctx.putImageData(imageData, 0, 0);
    window.requestAnimationFrame(repaint);
};
repaint(true);