Intel 815 manual Gfxrenderstateantialiasing

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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13.26.GFXRENDERSTATE_ANTI_ALIASING

The Anti-aliasing packet defines the anti-aliasing enable, bounding-box expansion, line anti-aliasing region, polygon anti-aliasing region, and edge flag enable State variables.

The anti-aliasing enable state variable turns on anti-aliasing of polygons and lines. The Bounding Box enclosing the triangle or line is expanded in all directions by the bounding box expansion value (in pixels) . The line antialiasing region width state variable allows for the specification of the width over which to blend for antialiasing of lines. Similarly, the polygon antialiasing region width state variable allows for the specification of the width over which to blend for antialiasing of polygon edges. The edge flag enable state variable enables all the edge flags of a triangle/line overriding the edge flags specified in the vertex format.

DWord	Bits	Description
0	31:29	Client : 03h – Rendering Engine
	28:24	3DState24 : 06h
	23:14	Reserved: 000h
	13	Edge Flag Enable Mask: 1 = Update; 0 = Do Not Update
	12	Edge Flag Enable: 1 = Enable; 0 = Disable
	11	Polygon Antialiasing Region Width Enable Mask: 1 = Update, 0 = Do Not Update
	10:9	Polygon Antialiasing Region Width: Valid values are:
		0h = 0.5 pixels
		1h = 1.0 pixels
		2h = 2.0 pixels
		3h = 4.0 pixels
	8	Line Antialiasing Region Width Enable Mask: 1 = Update, 0 = Do Not Update
	7:6	Line Antialiasing Region Width: Valid values are:
		0h = 0.5 pixels
		1h = 1.0 pixels
		2h = 2.0 pixels
		3h = 4.0 pixels
	5	Bounding Box Expansion Mask: 1 = Update, 0 = Do Not Update
	4:2	Bounding Box Expansion: U3.0 format(Unsigned) with valid values from 0 to 7pixels
	1	Anti-aliasing Enable Mask: 1 = Update, 0 = Do Not Update
0	0	Anti-aliasing Enable: 1 = Enable, 0 = Disable

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