GLint k;
    GLubyte texLine [16];   // 16-element texture array.

    /*  Define two green elements for the texture pattern.  
    /*  Each texture color is specified in four array positions.  
     */
    for (k = 0; k <= 2; k += 2)
    {
        texLine [4*k]   = 0;
        texLine [4*k+1] = 255;
        texLine [4*k+2] = 0;
        texLine [4*k+3] = 255;
    }

    /*  Define two red elements for the texture pattern.  */
    for (k = 1; k <= 3; k += 2)
    {
        texLine [4*k]   = 255;
        texLine [4*k+1] = 0;
        texLine [4*k+2] = 0;
        texLine [4*k+3] = 255;
    }

    glTexParameteri (GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri (GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

    glTexImage1D (GL_TEXTURE_1D, 0, GL_RGBA, 4, 0, GL_RGBA,
                   GL_UNSIGNED_BYTE, texLine);

    glEnable (GL_TEXTURE_1D);

    /*  Assign the full range of texture colors to a line segment.  */
    glBegin (GL_LINES);
        glTexCoord1f (0.0);
        glVertex3fv (endPt1);
        glTexCoord1f (1.0);
        glVertex3fv (endPt2);
    glEnd ( );

    glDisable (GL_TEXTURE_1D);