[Mesa3d-dev] Inconsistent scan conversion in XOR mode

[Howard <ho...@me...>]

Has anyone else observed a problem with the scan conversion of vertical and
horizontal lines while in XOR mode. We have consistently observed that there
are:
a) Irregularities in vertical and horizontal line, i.e. 4 - 10 pixel spans
that are offset by a pixel.
b) Non repeating patterns, i.e. the same vertical or horizontal line
coordinates plot these irregularities differently. This is especially
visible/troublesome in the XOR case, because the 2nd, (erase) draw does not
cover the same pixels, and consequently leaves scars. This only seems to
happen in the vertical/horizontal cases and does not happen when in a
normal, (non XOR) mode.

Thanks,
--
Howard Luby     Fax:248 540-3138 Tel:248 540-2251
ho...@me... http://www.mediascape.com