VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-129
3D Graphics Engine Registers
7HFKQRORJLHV ,QF
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GEbase + 50 – Texture Function......................................RW
31-22 Maximum U
21-12 Minimum U
11-5 Reserved
........................................ always reads 0
4Mask
0
Disable
1Enable
3-2
Texture Alpha
00 Texel alpha
01 Source alpha
10 Modulated alpha: texel alpha x source alpha
11 -reserved-
1-0
Texture Color
00 Texel color
01 Source color
10 Modulated color: texel color x source color
11 -reserved-
GEbase + 54 – Clipping Window 0 ..................................RW
31-28 Reserved
........................................ always reads 0
27-16 Clipping Window Top ............................. default = 0
15-12 Reserved
........................................ always reads 0
11-0 Clipping Window Left ............................ default = 0
GEbase + 58 – Clipping Window 1 ..................................RW
31-28 Reserved
........................................ always reads 0
27-16 Clipping Window Bottom........................ default = 0
15-12 Reserved
........................................ always reads 0
11-0 Clipping Window Right .......................... default = 0
GEbase + 60 – Color 0 (Foreground) .............................. RW
31-0 Foreground Color Value
GEbase + 64 – Color 1 (Background) ............................. RW
31-0 Background Color Value
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).
GEbase + 68 – Color Key ................................................. RW
31-26 Reserved
........................................ always reads 0
25
Destination Polarity
0
Draw on Equal
1
24
Source Polarity
0
Draw on Equal
1
23-0 Destination Color Key Color
Unlike foreground and background, the color is not
replicated in 16-bit or 8-bit modes.
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