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MB86R02 'Jade-D' Hardware Manual V1.64
GMDR2E (Geometry Mode Register for Triangle Extension)
Register
(SetGModeRegister)
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 extended mode at triangle drawing.
In case of TL=1 with texture mapping, please set perspective correction.
Non-top-left-part's pixel quality is less than body. (using approximate calculation)
Bit 10
TL (Top-Left rule mode)
Sets the drawing algorithm
0
Top-left rule applied (compatible with CREMSON)
1
Top-left rule not applied
Bit 8
SP (Shadow Primitive)
Sets the drawing mode for the shadow primitive
0
Shadow primitive not drawn
1
Shadow primitive drawn
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)
18-244
TL
SP
FD
W
W
W
0
0
0
CF
W
0
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