VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-128
3D Graphics Engine Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
GEbase + 48 – Raster Operation (ROP) .........................RW
31-8 Reserved
........................................ always reads 0
7-0
ROP3 Code
GEbase + 4C – Z Function ............................................... RW
31
Z-Bias
0
Disable
1Enable
30-17 Reserved
........................................ always reads 0
16-7 Z-Bias Value
6
Test Alpha
0
Disable
1Enable
5
Z-Buffer Write
0
Disable
1Enable
4-3
Reserved
........................................ always reads 0
2-0
Z-Buffer Compare
000 Compare False. Z and RGB values will not be
written to memory.
001 Compare Less Than. Z and RGB values will
be written to memory if the current Z value is
less than the Z value in memory.
010 Compare Equal. Z and RGB values will be
written to memory if the current Z value is
equal to the Z value in memory.
011 Compare Less Than or Equal.
Z and RGB
values will be written to memory if the current
Z value is less than the Z value in memory.
100 Compare Greater Than.
Z and RGB values
will be written to memory if the current Z
value is greater than the Z value in memory.
101 Compare Not Equal. Z and RGB values will
be written to memory if the current Z value is
not equal to the Z value in memory.
110 Compare Greater Than or Equal. Z and RGB
values will be written to memory if the current
Z value is greater than or equal to the Z value
in memory.
111 Compare True.
Z and RGB values will be
written to memory.
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