Intel 815 manual Gfxvertex

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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13.1.7.GFXVERTEX

Rendering Processor instructions include data per vertex. The vertex data format is the same for these instructions. GFXVERTEX is not an instruction, but a definition of this vertex data format. GFXVERTEX does not include an instruction header since it is not an instruction. The GFXVERTEX format is:

Dword	Bits	Description
0	31:4	X position : Relative to origin drawing rectangle or dest buffer. Valid data range is
		-383 to 1663. (IEEE float except 19 bit mantissa)
	3	Reserved: 00h
	2	Triangle Edge V2–V0 Enable : This flag enables anti-aliasing and wireframe
		capabilities for the triangle edge defined by the third and first vertices
		(1 = enable, 0 = disable). This flag field is valid only in the first vertex of the triangle
		definition. It is reserved otherwise.
	1	Triangle Edge V1–V2 Enable : This flag enables anti-aliasing and wireframe
		capabilities for the triangle edge defined by the second and third vertices
		(1 = enable, 0 = disable). This flag field is valid only in the first vertex of the triangle
		definition. It is reserved otherwise.
	0	Triangle Edge V0–V1 Enable : This flag enables anti-aliasing and wireframe
		capabilities for the triangle edge defined by the first and second vertices
		(1 = enable, 0 = disable). This flag field is valid only in the first vertex of the triangle
		definition. It is reserved otherwise.
1	31:0	Y position : Relative to origin of drawing rectangle or dest buffer. Valid data range is
		-383 to 1663. (IEEE float)
2	31:0	Z position : Normalized depth. Valid data range is 0 to 1. (IEEE float)
3	31:0	Z Bias: Valid data range is -1 to 1. (IEEE float)
4	31:0	Reciprocal of W : Valid data is any positive number.(IEEE float)
5	31:24	Color Alpha : Valid data range is 0 to 255. (unsigned int)
	23:16	Color Red : Valid data range is 0 to 255. (unsigned int)
	15:8	Color Green : Valid data range is 0 to 255. (unsigned int)
	7:0	Color Blue : Valid data range is 0 to 255. (unsigned int)
6	31:24	Fog Factor : Valid data range is 0 to 255. (unsigned int)
	23:16	Specular Red : Valid data range is 0 to 255. (unsigned int)
	15:8	Specular Green : Valid data range is 0 to 255. (unsigned int)
	7:0	Specular Blue : Valid data range is 0 to 255. (unsigned int)
7	31:0	Tu 0 : Texture coordinates. Data valid over entire IEEE floating point range. (IEEE
		float)
8	31:0	Tv 0: Texture coordinates. Data valid over entire IEEE floating point range. (IEEE
		float)
9	31:0	Tu 1: Texture coordinates. Data valid over entire IEEE floating point range. (IEEE
		float)
10	31:0	Tv 1: Texture coordinates. Data valid over entire IEEE floating point range. (IEEE
		float)

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