Intel 815 manual 3DStateMWNP Non-pipelined 1Dh, Opcode 80h

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

R

DWord	Bits	Description
0	31:29	Client : 03h – Rendering Engine
	28:24	3DStateMWNP (Non-pipelined) : 1Dh
	23:16	Opcode : 80h
	15:0	DWORD_LENGTH : 3
1	31	Drawing/Scissor Rectangle clipping Enable (for validation purpose only). This bit
		should be set to enable in normal mode.
		0 = Enable
		1 = Disable
	30:28	Reserved: 00h
	27:26	X Bias: A 2-bit value of x bias for dithering compensation
	25:24	Y Bias: A 2-bit value of y bias for dithering compensation
	23:0	Reserved: 00h
2	31:16	Clipped DR Ymin: Y coordinate of upper left corner of drawing rectangle after being
		clipped to screen boundary. Only the lower 10 bits in U10 format is used by hardware.
		This value is a pixel-aligned, unsigned integer, and reference to the upper-left corner
		of the 2D buffer defined in the dest buffer info packet.
	15:0	Clipped DR Xmin: X coordinate of upper left corner rectangle after being clipped to
		screen boundary. Only the lower 11 bits in U11 format is used by hardware. This
		value is a pixel-aligned, unsigned integer, and reference to the upper-left corner of the
		2D buffer defined in the dest buffer info packet.
3	31:16	Clipped DR Ymax: Y coordinate of lower right corner rectangle after being clipped to
		screen boundary. Only the lower 10 bits in U10 format is used by hardware. This
		value is a pixel-aligned, unsigned integer, and reference to the upper-left corner of the
		2D buffer defined in the dest buffer info packet.
	15:0	Clipped DR Xmax: X coordinate of lower right corner rectangle after being clipped to
		screen boundary. Only the lower 11 bits in U11 format is used by hardware. This
		value is a pixel-aligned, unsigned integer, and reference to the upper-left corner of the
		2D buffer defined in the dest buffer info packet.
4	31:27	Reserved
	26:16	DR origin Y: Origin of the Y coordinate of the drawing rectangle before being clipped
		to screen boundary. The value is S10 in 2’s complement format. This value is a pixel-
		aligned, and reference to the upper-left corner of the 2D buffer defined in the dest
		buffer packet.
	15:12	Reserved
	11:0	DR origin X: Origin of the X coordinate of the drawing rectangle before being clipped
		to screen boundary. The value is S11 in 2’s complement format. This value is a pixel-
		aligned, and reference to the upper-left corner of the 2D buffer defined in the dest
		buffer packet.

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