[Dri-devel] Re: [Dri-patches] CVS Update: xc (branch: mesa-3-5-branch)

[Keith Whitwell]

Brian Paul wrote:
> 
> CVSROOT:        /cvsroot/dri
> Module name:    xc
> Repository:     xc/xc/lib/GL/mesa/src/drv/tdfx/
> Changes by:     brianp@usw-pr-cvs1.     01/06/07 09:46:17
> 
> Log message:
>   add divide by zero checks to fix occasional clipping bugs in Q3
> 
> Modified files:
>       xc/xc/lib/GL/mesa/src/drv/tdfx/:  Tag: mesa-3-5-branch
>         tdfx_vbtmp.h
> 

Have you traced the source of these zero oow values?  Any vertex with clip w
== 0 should have clipmask != 0, therefore in tdfx_vbtmp.h

            if (mask[i] == 0) {
               /* unclipped */
               v->v.x   = s[0]  * proj[0][0] + s[12];   
               v->v.y   = s[5]  * proj[0][1] + s[13];   
               v->v.z   = s[10] * proj[0][2] + s[14];   
               v->v.rhw = proj[0][3];   
            } else {
               /* clipped */
               v->v.rhw = 1.0;
            }

the vertex oow value will be assigned 1.0.  Any ideas what's going wrong?

Keith

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