js_flush

function js_flush ()
{
    var canvas = document.getElementById('canvas');
    var glc = canvas.getContext('webgl');
    var WEBGL_lose_context = glc.getExtension('WEBGL_lose_context');
    glc.flush(); // do nothing :(
    console.log(glc);

    canvas.addEventListener("webglcontextlost", function(lost) {
        lost.preventDefault();
        console.log('context lost');
    }, false);

    canvas.addEventListener("webglcontextrestored", function(restore) {
        restore.preventDefault();
        console.log('context restored');
    }   , false);

    WEBGL_lose_context.loseContext();

    setTimeout(function(){
        WEBGL_lose_context.restoreContext();
    }, 1000);

}