Field Name             Bits   Default Description
FOG_SELECT             2:0    0x0     Specifies source for outgoing (GA to SU) fog value.
                                      POSSIBLE VALUES:
                                      00 - Select C0A
                                      01 - Select C1A
                                      02 - Select C2A
                                      03 - Select C3A
                                      04 - Select 1/(1/W)
                                      05 - Select Z
DEPTH_SELECT           3      0x0     Specifies source for outgoing (GA/SU & SU/RAS) depth
                                      value.
                                      POSSIBLE VALUES:
                                      00 - Select Z
                                      01 - Select 1/(1/W)
W_SELECT               4      0x0     Specifies source for outgoing (1/W) value, used to
                                      disable perspective correct colors/textures.
                                      POSSIBLE VALUES:
                                      00 - Select (1/W)
                                      01 - Select 1.0
FOG_STUFF_ENABLE       5      0x0     Controls enabling of fog stuffing into texture coordinate.
                                      POSSIBLE VALUES:
                                      00 - Disable fog texture stuffing
                                      01 - Enable fog texture stuffing
FOG_STUFF_TEX          9:6    0x0     Controls which texture gets fog value
FOG_STUFF_COMP         11:10  0x0     Controls which component of texture gets fog value
