Intel 815 manual Gfxrenderstatedestbuffervariables, Opcode 85h

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Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

13.28.GFXRENDERSTATE_DEST_BUFFER_VARIABLES

The GFXRENDERSTATE_DEST_BUFFER_VARIABLES instruction is used to specify the information about the destination buffer. This information is used to initialize rendering hardware parameters. The destination buffer contains the pixel color data for the scene being rasterized by the 3D Rendering Engine. This is a non-pipelined state variable. Two examples of how the Origin BIAS works are shown below.

 

Origin Bias (0.0, 0.0)

 

 

Origin Bias (0.5, 0.5)

0,0

x

 

0,0

x

 

 

 

y

(0.0,0.0)

 

y

(0.0,0.0)

Sample Point

(1.75,0.25)

(1.75,0.25)

 

 

 

 

 

 

Sample Point

 

(1.0,1.25)

 

(1.0,1.25)

 

 

 

 

origin.vsd

The format is:

DWord

Bit

Description

 

 

 

0

31:29

Client : 03h – Rendering Engine

 

 

 

 

28:24

3DStateMWNP (Non-pipelined) : 1Dh

 

 

 

 

23:16

Opcode : 85h

 

 

 

 

15:0

DWORD_LENGTH : 0

 

 

 

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Page 251
Image 251
Intel 815 manual Gfxrenderstatedestbuffervariables, Opcode 85h