r500/regs/ga_line_cntl.txt

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Field Name Bits Default Description
WIDTH 15:0 0x0 1/2 width of line, in subpixels (1/12 or 1/16 only, even in
8b subprecision); (16.0) fixed format.
END_TYPE 17:16 0x0 Specifies how ends of lines should be drawn.
POSSIBLE VALUES:
00 - Horizontal
01 - Vertical
02 - Square (horizontal or vertical depending upon slope)
03 - Computed (perpendicular to slope)
SORT 18 0x0 R520+: When enabled, all lines are sorted so that V0 is
vertex with smallest X, or if X equal, smallest Y.
POSSIBLE VALUES:
00 - No sorting (default)
01 - Sort on minX than MinY