[Bug 27199] New: Division by Zero error with glDrawRangeElementsEXT()

[Bug 27199] New: Division by Zero error with glDrawRangeElementsEXT()

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=27199

           Summary: Division by Zero error with glDrawRangeElementsEXT()
           Product: Mesa
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/r300
        AssignedTo: dri-devel@lists.sourceforge.net
        ReportedBy: rankincj@googlemail.com


Created an attachment (id=34243)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=34243)
Full stack 

This error kills World of Warcraft almost immediately on entering Azeroth.
(Login screens seem OK). Full stack trace is attached, but the part relevant to
R300 reads:

=Backtrace:
>0 0x7de37b40 emit_zb_offset+0x50() in r300_dri.so (0x0039f1fc)
  1 0x7de4b872 radeonEmitState+0x4b2() in r300_dri.so (0x0039f26c)
  2 0x7de32f20 r300DrawPrims+0xc30() in r300_dri.so (0x0039f31c)
  3 0x7dee657b vbo_validated_drawrangeelements+0x10b() in r300_dri.so
(0x0039f38c)
  4 0x7dee69a4 vbo_exec_DrawRangeElements+0x54() in r300_dri.so (0x0039f3bc)
  5 0x7dedafcb neutral_DrawRangeElements+0xab() in r300_dri.so (0x0039f3ec)
  6 0x7ed78291 wine_glDrawRangeElementsEXT+0xb1() in opengl32 (0x0039f44c)

This is with Mesa-git, xf86-drv-ati from git, libdrm-2.4.18 from F13, vanilla
kernel 2.6.33.1.


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[Bug 27199] Division by Zero error with glDrawRangeElementsEXT()

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=27199


Chris Rankin <rankincj@googlemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #34243|Full stack                  |Full WoW output, including
        description|                            |backtrace.




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[Bug 27199] Division by Zero error with glDrawRangeElementsEXT()

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=27199





--- Comment #1 from Chris Rankin <rankincj@googlemail.com>  2010-03-19 07:47:07 PST ---
This bus is also present in F12's Mesa 7.7-4 packages.


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[Bug 27199] Division by Zero error with glDrawRangeElementsEXT()

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=27199





--- Comment #2 from Chris Rankin <rankincj@googlemail.com>  2010-03-19 08:25:16 PST ---
This crash stopped happening after I added the following hack:

--- a/src/mesa/drivers/dri/r300/r300_cmdbuf.c
+++ b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
@@ -424,7 +424,7 @@ static void emit_zb_offset(GLcontext *ctx, struct
radeon_sta
        uint32_t dw = atom->check(ctx, atom);

        rrb = radeon_get_depthbuffer(&r300->radeon);
-       if (!rrb)
+       if (!rrb || (rrb->cpp == 0))
                return;

        zbpitch = (rrb->pitch / rrb->cpp);

However, this did result in a couple of "no rrb" messages in my output log.
There were also a lot of artifacts present (see attachment), although that may
be a separate bug.


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[Bug 27199] Division by Zero error with glDrawRangeElementsEXT()

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=27199





--- Comment #3 from Chris Rankin <rankincj@googlemail.com>  2010-03-19 08:48:58 PST ---
Created an attachment (id=34245)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=34245)
WoW screenshot, showing lots of artifacts

These artifacts may be a completely different bug, not just because I hacked
away at emit_zb_offset().


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[Bug 27199] Division by Zero error with glDrawRangeElementsEXT()

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=27199

Chris Rankin <rankincj@googlemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Chris Rankin <rankincj@googlemail.com> 2010-12-24 06:38:43 PST ---
No longer relevant now that r300g is the default driver. And was probably fixed
anyway.

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