User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
R
231
The settings for these stages are specified in the following instruction.
DWord Bit Description
0 31:29 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