Intel 815 manual Stipple Pattern, Opcode 83h

Models: 815

1 423
Download 423 pages 44.71 Kb
Page 247
Image 247

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

13.25.Stipple Pattern

The stipple pattern is a 4x4 bit memory that serves as pixel write mask. When stipple is enabled, the frame buffer will only be updated with pixels that have 1’s in their associated stipple pattern memory locations. The stipple pattern memory maps to a 4x4 pixel grid. The stipple pattern repeats for x and y coordinates on every span (4x4 pixels). The purpose of the stipple pattern is mostly for testing. This is a non-pipeline state variable. The stipple pattern pixel enable function can be represented as:

DWord

Bits

Description

 

 

 

0

31:29

Client : 03h – Rendering Engine

 

 

 

 

28:24

3DStateMWNP (Non-pipelined) : 1Dh

 

 

 

 

23:16

Opcode : 83h

 

 

 

 

15:0

DWORD_LENGTH : 0

 

 

 

1

31:17

Reserved

 

 

 

 

16

Enable: 1 = Enable, 0 = Disable

 

 

 

 

15:0

Stipple Pattern

 

 

 

247

Page 247
Image 247
Intel 815 manual Stipple Pattern, Opcode 83h