Michel Dänzer wrote:
First of all, thanks Keith for sharing your insights ( and Jens for the
URL about locking ).
On Don, 2002-11-28 at 13:31, Keith Whitwell wrote:
gloss: artifacts with the initial highlight, goes away with SW TCL,
seems to be the same problem as the ice in tuxracer
This is a result of slight differences between geometry generated by software
t&l and hardware t&l. The gloss cylendar is drawn in two passes, and the
crawling you see is a result of differences between the passes.
Some work could be done tweaking the vertices (z values?) emitted by swtcl to
get a closer alignemnt.
Otherwise, this isn't strictly a bug. GL doesn't require invarience at this
level.
I see. Do you have an idea on how to go about tweaking the vertices?
I think this might be a red herring. Firstly, I doubt we'd ever get the h/w
and s/w vertices to be identical in all situations. Secondly, any OpenGL
implementation may display this artifact. I've personally seen this problem
using a card which did both passes fully in hardware.
The real answer is to use a polygon offset in the gloss demo. I'll look
into fixing this.
If tuxracer is drawing coplaner geometry with substantialy different
state, it should also be using polygon offset.
-Brian
-------------------------------------------------------
This SF.net email is sponsored by: Get the new Palm Tungsten T
handheld. Power & Color in a compact size!
http://ads.sourceforge.net/cgi-bin/redirect.pl?palm0002en
_______________________________________________
Dri-devel mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/dri-devel
