Intel 815 manual Monopatblt, Instruction Target Opcode 42h, Pattern Background Color

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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12.2.9.MONO_PAT_BLT

MONO_PAT_BLT is used when there is no source and the monochrome pattern is not trivial (is not a solid color only). The monochrome pattern is loaded from the instruction stream and the only memory accesses are for the destination operand, which is dependent on the raster operation. The pattern vertical alignment indicates on which byte to start. The horizontal alignment is relative to the destination from the lower bits of the destination address. The monochrome pattern transparency mode indicates whether to use the pattern background color or deassert the write enables when the bit in the pattern is 0. When the pattern bit is 1, then the pattern foreground color is used in the ROP operation. The ROP value chosen should involve the Mono pattern data in the ROP operation.

•Only a positive destination pitch is allowed.

DWord	Bit	Description
0 = BR00	31:29	Client : 02h – 2D Processor
	28:22	Instruction Target (Opcode) : 42h
	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 : 06h
1 = BR13	31:29	Reserved. Must be Zero
	28	Mono Pattern Transparency Mode: (1 = transparency enabled;
		0 = use background)
	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)
	31:24	Reserved. Must be Zero
4 = BR16	23:00	Pattern Background Color:
	31:24	Reserved. Must be Zero
5 = BR17	23:00	Pattern Foreground Color:
6 = BR20	31:00	Pattern Data 0: (least significant DW)
7 = BR21	31:00	Pattern Data 1: (most significant DW)

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