Bugzilla – Bug 2625
quad strips are drawn in the wrong order on tcl-capable radeons
Last modified: 2009-08-24 12:23:05 UTC
With tcl_mode!=0, Mesa/samples/prim exhibits a bug with quad strips (at the top
right), the colors are switched compared to indirect rendering / sw tcl. AFAIK
this is due to the quad strips (reduced to another primitive since the radeons
don't support quads nor quad strips) being drawn in the wrong order. This is
probably a bug somewhere in the tnl code, IIRC the r200 had the same bug before
it was switched to use the native hw quads.
Turns out this probably isn't a bug. The interpolation for smooth shading is
different with hw quad strips and tri strips (which is what is used if hw quad
strips are not available). If I interpret the gl spec correctly, they actually
both seem to be correct (color interpolation with polygons which consist of more
than 3 vertices is surprisingly vague).
Mass version move, cvs -> git