Intel 815 Manuel D’Utilisation
Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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13.9. GFXRENDERSTATE_MAP_LOD_LIMITS
The limits of the Level of Detail calculation can be controlled within GC for each Map. These values are
specified in the following instruction as follows.
specified in the following instruction as follows.
Figure 36.
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 : 3h
18:17
Reserved: 00h (Additional Maps)
16
Update Map Index : The valid range is 0–1.
15:14
Reserved: 00h
13
Maximum Mip Level Mask : 0 = Do not update; 1 = Update
12:5
Maximum Mip Level : This is an unsigned 4.4 bit value which defines the highest
resolution map which may be accessed. A value of 0 equates to no limit on the mip
map selection. Values 1 through 10 will force the mip map selection to be between the
specified value and the highest defined mip map (the lowest resolution map). This
value must be less than the Minimum Mip Level.
resolution map which may be accessed. A value of 0 equates to no limit on the mip
map selection. Values 1 through 10 will force the mip map selection to be between the
specified value and the highest defined mip map (the lowest resolution map). This
value must be less than the Minimum Mip Level.
4
Minimum Mip Level Mask : 0 = Do not update; 1 = Update
3:0
Minimum Mip Level : This is an unsigned 4 bit value which defines the lowest
resolution map which may be accessed. Values 0 through 10 will force the mip map
selection to be between the maximum resolution mip map and the specified value.
This value must be correctly identified for the current map (no assumptions are made
about the number of mips associated with a particular map). This value must also be
greater than the Maximum Mip Level.
resolution map which may be accessed. Values 0 through 10 will force the mip map
selection to be between the maximum resolution mip map and the specified value.
This value must be correctly identified for the current map (no assumptions are made
about the number of mips associated with a particular map). This value must also be
greater than the Maximum Mip Level.