Field Name             Bits   Default Description
RGB0_SHADING           1:0    0x0     Specifies solid, flat or Gouraud shading.
                                      POSSIBLE VALUES:
                                      00 - Solid fill color
                                      01 - Flat shading
                                      02 - Gouraud shading
ALPHA0_SHADING         3:2    0x0     Specifies solid, flat or Gouraud shading.
                                      POSSIBLE VALUES:
                                      00 - Solid fill color
                                      01 - Flat shading
                                      02 - Gouraud shading
RGB1_SHADING           5:4    0x0     Specifies solid, flat or Gouraud shading.
                                      POSSIBLE VALUES:
                                      00 - Solid fill color
                                      01 - Flat shading
                                      02 - Gouraud shading
ALPHA1_SHADING         7:6    0x0     Specifies solid, flat or Gouraud shading.
                                      POSSIBLE VALUES:
                                      00 - Solid fill color
                                      01 - Flat shading
                                      02 - Gouraud shading
RGB2_SHADING           9:8    0x0     Specifies solid, flat or Gouraud shading.
                                      POSSIBLE VALUES:
                                      00 - Solid fill color
                                      01 - Flat shading
                                      02 - Gouraud shading
ALPHA2_SHADING         11:10  0x0     Specifies solid, flat or Gouraud shading.
                                      POSSIBLE VALUES:
                                      00 - Solid fill color
                                      01 - Flat shading
                                      02 - Gouraud shading
RGB3_SHADING           13:12  0x0     Specifies solid, flat or Gouraud shading.
                                      POSSIBLE VALUES:
                                      00 - Solid fill color
                                      01 - Flat shading
                                      02 - Gouraud shading
ALPHA3_SHADING         15:14  0x0     Specifies solid, flat or Gouraud shading.
                                      POSSIBLE VALUES:
                                      00 - Solid fill color
                                      01 - Flat shading
                                      02 - Gouraud shading
PROVOKING_VERTEX       17:16  0x0     Specifies, for flat shaded polygons, which vertex holds
                                      the polygon color.
                                      POSSIBLE VALUES:
                                      00 - Provoking is first vertex
                                      01 - Provoking is second vertex
                                      02 - Provoking is third vertex
                                      03 - Provoking is always last vertex
