User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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13.24. GFXRENDERSTATE_SCISSOR_RECTANGLE_INFO

The coordinate in this instruction packet is relative to the origin (upper left corner, DWord #4) of the

drawing rectangle defined in the GFXRENDERSTATE_DRAWING_RECTANGLE_INFO packet. The

coordinates of the scissor rectangle do not need to be clipped to screen boundary before sent to hardware.

DWord Bits Description

0 31:29 Client : 03h – Rendering Engine

28:24 3DStateMWNP (Non-pipelined) : 1Dh

23:16 Opcode : 81h

15:0 DWORD_LENGTH : 1

1 31:16 Ymin: Y coordinate of upper left corner. Only the lower 10 bits is used by hardware.

This value is pixel-aligned, U10 format, and reference to the origin (unclipped upper-

left corner) of the drawing rectangle.

15:0 Xmin: X coordinate of upper left corner. Only the lower 11 bits is used by hardware.

This value is pixel aligned, U11 format, and reference to the origin (unclipped upper-

left corner) of the drawing rectangle.

2 31:16 Ymax: Y coordinate of lower right corner. Only the lower 10 bits is used by hardware.

This value is pixel-aligned, U10 format, and reference to the origin (unclipped upper-

left corner) of the drawing rectangle.

15:0 Xmax: X coordinate of lower right corner. Only the lower 11 bits is used by hardware.

This value is pixel-aligned, U11 format, and reference to the origin (unclipped upper-

left corner) of the drawing rectangle.