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MB86R02 'Jade-D' Hardware Manual V1.64
GMDR2 (Geometry Mode Register for Triangle)
Register
GeometryBaseAddress + 48
address
Bit number
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit field name
R/W
Initial value
This register sets the geometry processing mode when a triangle is drawn.
Drawing performed using commands in range from G_Begin to G_End
Bit 2
FD (Face Definition)
Sets the face definition
0
Face defined as state with vertexes arranged clockwise
1
Face defined as state with vertexes arranged counterclockwise
Bit 0
CF (Cull Face)
Sets the drawing mode of the back
0
Back drawn
1
Back not drawn (value disabled for polygons)
H
FD
CF
W
W
0
0
18-243
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