User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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13.5. GFXRENDERSTATE_MAP_TEXELS
The Mapping Engine is capable of generating at most two texels per pixel. The texels may be obtained
from two separate maps or the same map using different u,v coordinates. The binding between the texels
which are generated by the engine and the coordinate set and the map information state is specified with
this instruction. The texels are generated in the order specified by the Texel Index. If no texel is enabled,
texture mapping is disabled and this is the default condition. If one of the two texels is enabled, one
texture coordinate will be used for texture mapping. If both texels are enabled, both texture coordinates
will be used for texture mapping.
Figure 31. State Variable Relationships
Coordinate Sets Map Information
Blending Stages
Texels
DWord Bit Description
0 31:29 Client : 03h – Rendering Engine
28:24 3DState16 : 1Ch
23:19 Opcode : 0h
18:16 Reserved: 00h (Additional Texels)
15 Texel 1 State Variable Mask : 0 = Do not update; 1 = Update
14 Texel 1 Enable :
0 = Disable (default)
1 = Enable
13:12 Reserved: 00h (Additional Coordinate Sets)
11 Texel 1 Coordinate Set Index : Index to the Coordinate Set.
10:9 Reserved: 00h (Addition Map Information)
8 Texel 1 Map Information Index : Index to the Map Information.
7 Texel 0 State Variable Mask : 0 = Do not update; 1 = Update
6 Texel 0 Enable :
0 = Disable (default)
1 = Enable
5:4 Reserved: 00h (Additional Coordinate Sets)
3 Texel 0 Coordinate Set Index : Index to the Coordinate Set.
2:1 Reserved: 00h (Addition Map Information)
0 0 Texel 0 Map Information Index : Index to the Map Information.