User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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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