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https://bugs.freedesktop.org/show_bug.cgi?id=9062
Summary: tnl - full vertex buffers may cause additional
primitives to be introduced
Product: Mesa
Version: CVS
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Mesa core
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
the hypertorus hack of xscreensaver (recent version may be needed - 4.24 should
be new enough, I've used 5.0.1) shows some seemingly random triangles when
started with the right options (-solid -transparent should do). I've looked a
bit at it and it seems whenever a buffer wrap happens due to the buffer being
full (so _tnl_wrap_filled_vertex is called, not sure if it's correct if
_tnl_wrap_buffers gets called due to other reasons) an additional tri will be
introduced (actually I think one is just drawn twice). This happens with both
software mesa and r200, though with r200 only when tcl_mode is either 1 or 0.
hypertorus uses GL_TRIANGLE_STRIP for all its rendering. I initially thought
there might be a bug because of the excessive glMaterial calls between
glBegin/glEnd, but removing them completely (by replacing with enabling
GL_COLOR_MATERIAL) didn't change much, except there were far fewer additional
triangles, apparently because much less buffer wraps happen. Not sure, but
_tnl_copy_vertices looked a bit strange to me for GL_TRIANGLE_STRIP, as it may
copy 3 instead of only the last 2 vertices - apparently to avoid problems with
the vertex order, but I'll wonder if that's related to this bug.
(this was originally reported here:
https://bugs.freedesktop.org/show_bug.cgi?id=8250)
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