[Mesa3d-dev] [Bug 16866] New: Bug in selection, depth buffer sorting seems wrong

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=16866

           Summary: Bug in selection, depth buffer sorting seems wrong
           Product: Mesa
           Version: 7.0.3
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: high
         Component: Mesa core
        AssignedTo: mes...@li...
        ReportedBy: bar...@li...


Created an attachment (id=17921)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=17921)
Correct selection

When selecting faces in K-3D, selections are fine in Mesa 7.0.1, but seem to go
"through" the object in 7.0.3 (as obtained from ubuntu 8.04). The problem still
appeared in the GIT version obtained a few days ago. The 7.0.1 shows correct
behavior, resulting in the front face being selected (red) when it is clicked.
Doing the same operation in 7.0.3 (second screenshot) results in the bottom
face being selected, even though the front face was clicked. At the moment of
the selection click, the bottom face was behind the front face. It appears as
though when in GL_SELECT mode, Mesa gets the depth order wrong.

THe bug appears both in the VBO and non-VBO code for drawing faces. Selection
in K-3D happens in GL_SELECT mode.

Hardware is an intel graphics chip:

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
        Subsystem: Toshiba America Info Systems Unknown device ff50


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