Intel 815 manual 2824 3DState24 02h, Alpha Shade Mode State Mask 1 = Update 0 = Do Not Update

Models: 815

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Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

DWord

Bit

Description

031:29 Client : 03h Render Processor

28:24 3DState24 : 02h

23 Reserved

22:21 Reserved

20 Z Function State Mask : 1 = Update ; 0 = Do Not Update

19:16

Z Function : Valid values are :

 

00h

= Reserved

 

01h

= Never (never pass)

 

02h

= Less (pass if the source Z is less than the destination Z)

 

03h

= Equal (pass if the source Z is equal to the destination Z)

 

04h

= Lequal (pass if the source Z is less than or equal to the destination Z)

 

05h

= Greater (pass if the source Z is greater than the destination Z)

 

06h

= Notequal (pass if the source Z is note equal to the destination Z)

 

07h

= Gequal (pass if the source Z is greater than or equal to the destination Z)

 

08h

= Always (always pass)

 

 

15

Line Width State Mask : 1 = Update; 0 = Do Not Update

 

 

14:12

Line Width : This value specifies the width of lines in pixels. The variable is

 

represented as an unsigned value with 2 integer bits and 1 fractional bit. Valid values

 

range from 0.0 to 3.5 in .5 increments. The default value is 0.

 

 

11

Alpha Shade Mode State Mask : 1 = Update; 0 = Do Not Update

 

 

10

Alpha Shade Mode : 1 = Flat, 0 = Gouraud (default)

 

 

9

Fog Shade Mode State Mask : 1 = Update; 0 = Do Not Update

 

 

8

Fog Shade Mode : 1 = Flat, 0 = Gouraud (default)

 

 

7

Specular Shade Mode State Mask : 1 = Update; 0 = Do Not Update

 

 

6

Specular Shade Mode : 1 = Flat, 0 = Gouraud (default)

 

 

5

Color Shade Mode State Mask : 1 = Update; 0 = Do Not Update

 

 

4

Color Shade Mode : 1 = Flat, 0 = Gouraud (default)

 

 

3

Cull Mode State Mask : 1 = Update; 0 = Do Not Update

 

 

2:0

Cull Mode : To support culling of back facing triangles

 

000

= Reserved

 

001

= Cull No Triangle (No back face removal)

 

010

= Cull CW Triangles (Allow CCW triangles)

 

011

= Cull CCW Triangles (Allow CW triangles)

 

100

= Cull Both (For performance experiments

 

101 to 111 = Reserved

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Image 240
Intel 815 manual 2824 3DState24 02h, Alpha Shade Mode State Mask 1 = Update 0 = Do Not Update