Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

The settings for these stages are specified in the following instruction.

DWord

Bit

Description

031:29 Client : 03h – Rendering Engine

 

28:24

3DState24 : 01h

 

23:22

Reserved: 00h (Additional Blending Stages)

 

 

 

 

21:20

Update Blending Stage Index : The valid range is 0–2.

 

 

 

 

19

Reserved: 00h

 

 

 

 

18

Alpha Arg1 Mask : 0 = Do not update; 1 = Update

 

 

 

 

17:15

Alpha Arg1: Valid values are :

 

 

0h

= Reserved

 

 

1h

= Alpha Factor

 

 

2h

= Reserved

 

 

3h

= Iterated Alpha

 

 

4h

= Reserved

 

 

5h

= Current Alpha

 

 

6h

= Texel0 Alpha

 

 

7h

= Texel1 Alpha

 

 

 

 

14

Reserved: 00h

 

 

 

 

13

Invert Alpha Arg1:

 

 

0 = Do not Invert Argument

 

 

1 = Invert Argument

 

 

 

 

12

Alpha Arg2 Mask : 0 = Do not update; 1 = Update

 

 

 

 

11

Reserved: 00h

 

 

 

 

10:8

Alpha Arg2 : Valid values are :

 

 

0h

= Reserved

 

 

1h

= Alpha Factor

 

 

2h

= Reserved

 

 

3h

= Iterated Alpha

 

 

4h

= Reserved

 

 

5h

= Current Alpha

 

 

6h

= Texel0 Alpha

 

 

7h

= Texel1 Alpha

 

 

 

 

7

Reserved: 00h

 

 

 

 

6

Invert Alpha Arg2:

 

 

0 = Do not Invert Argument

 

 

1 = Invert Argument

 

 

 

0

5

Alpha Operation Mask : 0 = Do not update; 1 = Update

231

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Image 231
Intel 815 manual 3DState24 01h, Invert Alpha Arg1, Invert Alpha Arg2