Intel 815 Manuel D’Utilisation

232  

 

0 4:0 

Alpha Operation: Valid values are : 

00h = Reserved 

(Enable/Disable of stage is programmed in the Color Operation field) 

01h = Select Arg1 
02h = Select Arg2 
03h = Modulate 
04h = Modulate and Multiply by 2 
05h = Modulate and Multiply by 4 
06h = Add 
07h = Add Signed  
08h = Linearly Blend using the Iterated Alpha as the Blend Term 
09h = Reserved 
0Ah = Linearly Blend using the Alpha Factor as the Blend Term 
0Bh = Reserved (Linearly Blend when a pre-multiplied map alpha is present) 
0Ch = Reserved (Pre-modulate) 
0Ch = Reserved (Bump/Environment Map) 
0Dh = Reserved (Bump pre-modulate with luminance channel) 
0Fh = Reserved 
10h = Linearly Blend using Texel0’s Alpha as the Blend Term 
11h = Linearly Blend using Texel1’s Alpha as the Blend Term 
12h–1Fh = Reserved 

This instruction specifies a constant color factor, which can be used in the blending stages. 

 

0 31:29 

Client : 03h – Rendering Engine 

 28:24 

3DStateMW : 1Dh 

 23:16 

Instruction : 1h 

 15:0 

DWORD_LENGTH : 0 

1 31:0 

Color Factor: This is a 32 bit value in ARGB 8888 format. The top 8 bits used by the 
alpha blending stage and the lower 24 bits used by the color blending stage.