Intel 815 manual Instruction Target Opcode 48h, Dword Length 0Ah

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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12.2.16. FULL_MONO_PATTERN_MONO_SRC_BLT

The full BLT provides the ability to specify all 3 operands: destination, source, and pattern. The pattern and source operands are monochrome.

The monochrome pattern is loaded from the instruction stream. The pattern vertical alignment specifies which scan line of the pattern is used first. The destination address specifies the horizontal alignment. The only memory accesses required for the remainder of the BLT is destination and monochrome source accesses.

The monochrome source transparency mode indicates whether to use the source background color or deassert the write enables when the bit in the source is 0. When the source bit is 1, the source foreground color is used in the ROP operation. The ROP value chosen should involve the Mono source and Mono pattern.

All non-text monochrome sources are word aligned. At the end of a scan line the monochrome source, the bits until the next word boundary must be ignored. The Monochrome source data bit position field [2:0] indicates which bit position within the first byte should be used as the first source pixel.

The monochrome pattern transparency mode indicates whether to use the pattern background color or deassert the write enables when the bit in the source is 0. When the source bit is 1, the pattern foreground color is used in the ROP operation. The monochrome source transparency mode works identical to the pattern transparency mode.

The destination pitches can be either sign. The pattern direction follows the destination operand.

DWord	Bit	Description
0 = BR00	31:29	Client : 02h – 2D Processor
	28:22	Instruction Target (Opcode) : 48h
	21:20	Reserved. Must be Zero
	19:17	Monochrome source data bit position of the first pixel within a byte per scan
		line.
	16:08	Reserved. Must be Zero
	07:05	Pattern Vertical Alignment: (which scan line of the 8x8 pattern to start on)
	04:00	Dword Length : 0Ah

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