Michel Dänzer wrote:
There are a bunch of waysFirst 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: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.gloss: artifacts with the initial highlight, goes away with SW TCL, seems to be the same problem as the ice in tuxracer
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?
- tweak the zscale and zoffset viewport parameters but *ONLY* when hardware tcl is disabled (probably the best option?)
- turn off _radeon_render_stage, and tweak the vertices as they are emitted in radeon_draw_triangle() and radeon_draw_quad(). These functions are now generated ty t_dd_triemit.c, so you'll have to dig a little. (might be the easiest for debugging).
- Modify the vertices as they are generated by t_dd_vbtmp.h. There is facility in there for an additional viewport transformation, for instance.
Keith
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