Product specifications

VT8601A Apollo PLE133
Revision 1.82 October 22, 2001 -128 3D Graphics Engine Registers
Technologies, Inc.
Delivering Value
Delivering ValueDelivering Value
Delivering Value
GEbase + 50 – Texture Function ......................................RW
31-22 Maximum U
21-12 Minimum U
11-5 Reserved .........................................always reads 0
4 Mask
0 Disable
1 Enable
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,and5bitsofBlue).
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.