User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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12.2.6. TEXT_Immediate_BLT

This instruction allows the Driver to send data through the instruction stream, which eliminates the read

latency of reading a source from memory. This allows graphics primitives such as Text to execute much

faster. If an operand is in system cacheable memory and either is small or only accessed once, it can be

copied directly to the instruction stream versus to graphics accessible memory.

• The IMMEDIATE_BLT data MUST transfer an even number of DWs. The BLT engine will hang if

it does not get an even number of DWs.

• Monochrome source data is sent through the instruction stream.

• All monochrome source scan lines and pixels that fall within the ClipRect Y addresses and X

coordinates are written (ignoring the raster operation) to (Destination Y Address + Destination X

coordinate * bytes per pixel). Source expansion color registers are always in the SETUP_BLT.

DWord Bit Description

0 = BR00 31:29 Client : 02h – 2D Processor

28:22 Instruction Target (Opcode) : 30h

21:17 Reserved. Must be Zero

16 Bit (0) / Byte (1) packed: Byte packing is for the Windows* NT* driver

15:00 Dword Length : 02+ DWL = (Number of Immediate double words)h

1 = BR08 31:16 Destination X2 Coordinate: (Ending - Right)

(27:16 = 12 bits are implemented in the Intel

815 chipset )

15:00 Destination X1 coordinate: (Starting - Left) - X2 - X1 + 1 = width in pixels

(11:00 = 12 bits are implemented in the Intel

815 chipset)

2 = BR09 31:00 Destination Y1 Address: (address of the first pixel on the first scan line)

(25:00 are implemented in Intel

810 chipset)

3 = BR10 31:00 Destination Y2 Address: (address of the first pixel on the last scan line)

(25:00 are implemented in Intel

810 chipset)

4 31:00 Immediate Data DW 0:

5 31:00 Immediate Data DW 1:

6 thru DWL+3 S Immediate Data DWs 2 through DWORD_LENGTH (DWL):