User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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12.2.8. PAT_BLT
PAT_BLT is used when there is no source and the color pattern is not trivial (is not a solid color only).
The whole color pattern (8 x 8 pixels = 16, 32, or 64 DWs) is read at the beginning of the BLT and
stored in the Texture Cache. The pattern vertical alignment specifies the first scan line of the pattern that
is used. The horizontal alignment is relative to the destination from the lower bits of the destination
address.
The only memory accesses required for the remainder of the BLT is destination accesses, which is
dependent on the raster operation.
Only a positive destination pitch is allowed.
DWord Bit Description
0 = BR00 31:29 Client : 02h – 2D Processor
28:22 Instruction Target (Opcode) : 41h
21:08 Reserved. Must be Zero
07:05 Pattern Vertical Alignment: (which scan line of the 8x8 pattern to start on)
04:00 Dword Length : 03h
1 = BR13 31:28 Reserved. Must be Zero
27 Reserved. Must be Zero
26 Must Be One (‘1’).
25:24 Color Depth:
00 = 8 bit color
01 = 16 bit color
10 = 24 bit color
11 = reserved
23:16 Raster Operation:
15:00 Destination Pitch (positive): (13:00 are implemented in Intel
®
810 chipset)
2 = BR14 31:16 Destination Height (in scan lines): (28:16 are implemented in Intel
®
810 chipset)
15:00 Destination Width (in bytes): (12:00 are implemented in Intel
®
810 chipset)
3 = BR09 31:00 Destination Address: Address of the first byte to be written
(25:00 are implemented in Intel
®
810 chipset)
4 = BR15 31:00 Pattern Address: (25:06 are implemented in Intel
®
810 chipset)