[Bug 43096] New: r300g: r300_emit_draw_elements() refusing to render when max_index = 0xffffffff

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=43096

             Bug #: 43096
           Summary: r300g: r300_emit_draw_elements() refusing to render
                    when max_index = 0xffffffff
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: tstellar at gmail.com


Created attachment 53692
  --> https://bugs.freedesktop.org/attachment.cgi?id=53692
Callstack from error message

I'm not exactly sure if this is a bug in r300g or st/mesa, but none of the
leader portraits are rendered in Civ4 and this error message is being printed:

r300: Got a huge number of vertices: 310, refusing to render (max_index: -1).

The reason this error message is being printed is because max_index is
0xffffffff, so this if statement at r300_render.c:448 evaluates to true:

if (count >= (1 << 24) || max_index >= (1 << 24)) {
        fprintf(stderr, "r300: Got a huge number of vertices: %i, "
                "refusing to render (max_index: %i).\n", count, max_index);
        return;
}

I'm not sure if the state tracker is wrong for passing 0xffffffff as the
max_index or if the driver needs to handle a max_index of 0xffffffff as a
special case, because it is the default value for pipe_draw_info->max_index.  I
have captured the call stack when this error message is printed and attached it
to this bug report.

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