_loop_1 = function () {
                texture = textures[i];
                if (texture.isReady()) {
                    if (--numRemaining === 0) {
                        callback();
                    }
                }
                else {
                    onLoadObservable = texture.onLoadObservable;
                    var onLoadCallback_1 = function () {
                        onLoadObservable.removeCallback(onLoadCallback_1);
                        if (--numRemaining === 0) {
                            callback();
                        }
                    };
                    onLoadObservable.add(onLoadCallback_1);
                }
            }
An event triggered when the texture is disposed.
@type {BABYLON.Observable}