code: function () {
              var indices = [
                  0, 1, 2,
                  2, 1, 3
              ];
  
              // ~384KB index buffer
              var data = new Array(MAX_LENGTH * INDICES_PER_QUAD);
              for (var i = 0; i < data.length; i++) {
                  data[i] = indices[i % INDICES_PER_QUAD] +
                      ~~(i / INDICES_PER_QUAD) * ELEMENTS_PER_QUAD;
              }
  
              return new Uint16Array(data);
          }
docs: Create a full index buffer for the element array
  @ignore