User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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12.2.3. PIXEL_BLT
The Destination X coordinate and Destination Y Address is compared with the ClipRect registers. If it is
within all 4 comparisons, then the pixel supplied in the SETUP_BLT instruction is written with the raster
operation to (Destination Y Address + Destination X coordinate * bytes per pixel).
DWord Bit Description
0 = BR00 31:29 Client : 02h – 2D Processor
28:22 Instruction Target (Opcode) : 20h
0 = BR08 21:06 Destination X Coordinate: (17:06 = 12 bits are implemented in the Intel
®
815 chipset)
05 Reserved. Must be Zero
0 04:00 Dword Length : 00h
1 = BR09 31:00 Destination Y Address: (address of the first pixel on a scan line) (25:00 are
implemented in Intel
®
810 chipset)
12.2.4. SCANLINE_BLT
The Destination Y Address is compared against the ClipRect Y address registers. If the address is within
this comparison, then the pattern pixels dependent on the Destination X coordinates that fall within the
ClipRect X comparisons are written using the raster operation to (Destination Y Address + Destination X
coordinate * bytes per pixel). The horizontal alignment is relative to the destination from the lower bits
of the destination address. The pattern vertical alignment indicates which pattern scan line is used (this is
the least significant three bits of the destination vertical coordinate). With color patterns only 1 scan line
should be read for this instruction.
• Solid pattern should use the SETUP_MONO_PATTERN_SL_BLT instruction.
DWord Bit Description
0 = BR00 31:29 Client : 02h – 2D Processor
28:22 Instruction Target (Opcode) : 21h
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 : 01h
1 = BR08 31:16 Destination X2 Coordinate: (Ending - Right)
(Intel
®
815 chipset implementation supports 27:16 = 12 bits)
15:00 Destination X1 Coordinate: (Starting - Left) - X2 - X1 + 1 = width in pixels
(Intel
®
815 chipset implementation supports 11:00 = 12 bits)
2 = BR09 31:00 Destination Y Address: (address of the first pixel on a scan line)
(25:00 is implemented inIntel
®
810 chipset)