GameLib.D3.Game = function (

) {
    this.scenes = {};
};

GameLib.D3.Game.prototype.addScene = function(
    scene,
    identifer
) {
    this.scenes[identifer] = scene;
};

GameLib.D3.Game.prototype.processPhysics = function (
    dt
) {
    for(var s in this.scenes) {
        var scene = this.scenes[s];

        for(var w in scene.worlds) {
            var world = scene.worlds[w];
            world.step(dt);
        }
    }
};

GameLib.D3.Game.prototype.render = function(
    dt,
    renderer
) {
    for(var s in this.scenes) {
        var scene = this.scenes[s];
        scene.render(dt, renderer, scene.cameras[scene.activeCameraIndex]);
    }
};

GameLib.D3.Game.prototype.update = function(
    dt,
    fixedDt
) {
    for(var s in this.scenes) {
        var scene = this.scenes[s];

        for(var w in scene.worlds) {
            var world = scene.worlds[w];
            // NOTE: We are calling the step function with a variable timestep!
            world.step(fixedDt, dt);
        }

        scene.update(dt);
        scene.lateUpdate(dt);
    }
};