VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-130
3D Graphics Engine Registers
7HFKQRORJLHV ,QF
:H&
:H&RRQQHFW
QQHFW
GEbase + 6C – Pattern and Style.....................................RW
31
Pattern Color Expansion
0
Disable ...................................................default
1Enable
30
Pattern Transparency
0
Opaque ...................................................default
1
Transparent
29
Pattern Size
0
8 x 8 pixels .............................................default
1
32 x 32 pixels (mono only)
28
Pattern Register Segment
0
Low Segment..........................................default
1
High Segment
Note: The pattern cache is divided into two segments
for double pattern purposes.
This bit serves two
purposes: First as the starting segment for loading a
pattern into the pattern cache, the corresponding
address is latched into an internal register which will
automatically increase by one when data is loaded.
Second as the segment base of the current pattern
when applying a pattern.
27-24 Reserved
........................................ always reads 0
23-16 Pattern Style Step
The # of pixels each mask bit should be mapped to:
00 1 Pixel per mask bit................................default
01 2 pixels per mask bit
02 3 pixels per mask bit
……
FF 256 pixels per mask bit
15-0 Pattern Style Mask
Determines the line drawing style (e.g., dotted line).
Bit-0 maps to the first pixel. Writing to the low byte
of ths register (GEbase + 6C) causes the internal style
count to be reset to 0.
When 3D operations are
enabled (smooth shading, texture, Z), style line must
be transparent and style applies to color as well as Z.
GEbase + 70 – Pattern Color............................................RW
31-0 Pattern Color Value
Must follow the command. The pattern data could be
repeated up to 64 times to fill out the pattern register
file.
GEbase + 74 – Pattern Foreground Color...................... RW
31-0 Foreground Color Value.......................... default = 0
GEbase + 78 – Pattern Background Color ..................... RW
31-0 Background Color Value ......................... default = 0
Note: In 16- and 8- bit modes, the color must be duplicated to
fill an entire 32-bit word. 32-bit color is in ARGB format
(i.e., Alpha, Red, Green, and Blue in bytes 3-0 respectively)
and 16-bit color is in RGB 565 format (5 bits of Red, 6 bits of
Green, and 5 bits of Blue).
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