From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 27199] Division by Zero error with glDrawRangeElementsEXT()
Date: Fri, 19 Mar 2010 08:25:16 -0700 (PDT)
Message-ID: <20100319152516.C5158130118@annarchy.freedesktop.org>
References: <bug-27199-502@http.bugs.freedesktop.org/>
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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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