GLubyte texArray [32][32][4];

    /*  Next: assign the texture color components to texArray.  */

    /*  Select nearest-color option.  */
    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);


    glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, 32, 32, 0, GL_RGBA,
                   GL_UNSIGNED_BYTE, texArray);

    glEnable (GL_TEXTURE_2D);

    /*  Assign the full range of texture colors to a quadrilateral.  */
    glBegin (GL_QUADS);
        glTexCoord2f (0.0, 0.0);     glVertex3fv (vertex1);
        glTexCoord2f (1.0, 0.0);     glVertex3fv (vertex2);
        glTexCoord2f (1.0, 1.0);     glVertex3fv (vertex3);
        glTexCoord2f (0.0, 1.0);     glVertex3fv (vertex4);
    glEnd ( );

    glDisable (GL_TEXTURE_2D);