Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

15.4.8.2.DCLRKM—Destination Color Key Mask Register

Memory Address Offset:

 

 

54h (R/W)

 

 

 

 

On-chip Reg. Mem Addr Offset:

30154h (RO; debug path)

 

 

Default Value:

 

 

00h

 

 

 

 

Access:

 

 

 

 

 

see address offset above

 

 

Size:

 

 

 

 

 

32 bits

 

 

 

 

31

 

 

30

29

 

28

24

23

0

 

 

 

Dest Color

 

Dest

Always

 

Reserved

 

 

Destination Color Key mask

 

 

 

Key En

 

 

Const α

Const α

 

 

 

 

 

 

 

 

 

 

 

 

Blend

Blend

 

 

 

 

 

 

 

 

 

 

 

 

Enable

Enable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

31

 

Destination Color Key Enable.

 

 

 

 

 

 

 

 

 

1

= destination color key is enabled

 

 

 

 

 

 

 

 

0

= destination color key is disabled

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

Destination Constant Alpha Blend Enable

 

 

 

 

 

 

 

 

1

= Enable Constant Alpha Blending between the overlay and the primary display when the Destination

 

 

 

 

 

 

Color Key does not match and Destination Color Keying is enabled within the Alpha Blend Window.

 

 

 

 

0

= Disable Constant Alpha Blending

 

 

 

 

 

 

 

 

 

 

 

 

 

29

 

Always Constant Alpha Blend Enable

 

 

 

 

 

 

 

 

1

= Enable Constant Alpha Blending within the Alpha Blend Window

 

 

 

 

0

= Disable Constant Alpha Blending

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28:24

 

Reserved.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

23:0

 

Destination Color Key Mask.

 

 

 

 

 

 

 

 

 

0

= Bits that are active participants in the compare.

 

 

 

 

 

 

 

 

1

= Bits that are active participants in the compare. A mask of all ones will disable the color key (as if

 

 

 

 

 

 

all colors match).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

289

Page 289
Image 289
Intel 815 manual DCLRKM-Destination Color Key Mask Register, Destination Constant Alpha Blend Enable