ct = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, texCoordObject);
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(
        [0,0, 1,0, 0,1,
         0,1, 1,0, 1,1]), drawType);
    gl.enableVertexAttribArray(1);
    gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after texture coord setup");

    // Now resize these buffers because we want to change what we're drawing.
    gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
    gl.bufferData(gl.ARRAY_BUF