User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

221

DWord Bit Description

2 31 Dimensions are Powers of 2: This field specifies whether the following Height and

Width fields of the map are specified as the log

of the actual dimension or as the

actual height or width. If the actual values are used, the coordinate set addresses must

be non-normalized and are clamped (they can not be wrapped or mirrored).

0 = Height/Width are the actual dimensions of the map in pixels

1 = Height/Width are log

of the actual dimensions of the base map

30:26 Reserved: 00h (Additional Height)

25:16 Height: If the dimensions are to be specified as powers of two (as determined by the

Power of 2 field), this field must contain one of the following values:

0h = 1 texel high 4h = 16 texels high 8h = 256 texels high

1h = 2 texels high 5h = 32 texels high 9h = 512 texels high

2h = 4 texels high 6h = 64 texels high ah = 1024 texels high

3h = 8 texels high 7h = 128 texels high

If the dimensions are to be specified as the actual values, this field contains the

surface height -1

in units of texels. The range for this value is 0–1023.

15:10 Reserved: 00h

9:0 Width: If the dimensions are to be specified as powers of two (as determined by the

Dimension Power of 2 field), this field must contain one of the following values:

0h = 1 texel wide 4h = 16 texels wide 8h = 256 texels wide

1h = 2 texels wide 5h = 32 texels wide 9h = 512 texels wide

2h = 4 texels wide 6h = 64 texels wide Ah = 1024 texels wide

3h = 8 texels wide 7h = 128 texels wide

If the dimensions are to be specified as the actual values, this field contains the

surface width -1

in units of texels. The valid range for this value is 0–1023 for all

surface formats except 4:2:2. For 4:2:2 surfaces, this value may be even 8–1022.

3 31:4 Map Base Address: Virtual memory address, which is aligned on 16 byte boundaries.

Bits [31:4] of a 32-bit byte address are specified.

3:0 Reserved: 0h