   TOP_CENTER: 7,
            TOP_RIGHT: 8,
            MAX: 9
        };

        var viewport = new Array(Views.MAX);

        for (var i = 0; i < Views.MAX; ++i) {
            var row = Math.floor(i / 3);
            var col = i % 3;
            viewport[i] = {
                x: windowSize.x * col / 3.0,
                y: windowSize.y * row / 3.0,
                z: windowSize.x / 3.0,
                w: windowSize.y / 3.0
            };
        }

        // -- Init program
        var programUint = c