Dear list,
http://cpbotha.net/thingies/dri_scapula.png shows a surface-rendering of a human scapula (shoulder blade). Notice the strange extra edges that I've indicated with grotesque red arrows.
http://cpbotha.net/thingies/dri_scapula_wireframe.png is a wireframe rendering of the exact same data. Notice the distinct absence of these extra edges.
This is with current DRI CVS on a Radeon M7. With X 4.3.0, it renders perfectly in both cases, i.e. without the edges. I've also tried with both TCL and VTX disabled, I still get the unwanted edges. The application itself is VTK-based.
My guess is that TCL is for some reason disabling itself & this is a fallback. The edges are caused by incorrect copying of vertices in the mesa t&l module when vertex buffers are filled. Somehow this bug has appeared in the mesa in the dri trunk or perhaps is present but not exposed in XFree86.
Keith
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