 0,   150,   0,
          30,  150,  30,
          30,  150,   0,

          // left side
          0,   0,   0,
          0,   0,  30,
          0, 150,  30,
          0,   0,   0,
          0, 150,  30,
          0, 150,   0,
      ]),
      gl.STATIC_DRAW);
}

// Fill the current ARRAY_BUFFER buffer with colors for the 'F'.
function setColors(gl) {
  gl.bufferData(
      gl.ARRAY_BUFFER,
      new Uint8Array([
          // left column front
        200,  70, 120,
        200,  70, 120,
        200,  70, 