From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 83510] Graphical glitches in Unreal Engine 4 Date: Thu, 04 Dec 2014 13:38:16 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0725625215==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id E16296E37E for ; Thu, 4 Dec 2014 05:38:15 -0800 (PST) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============0725625215== Content-Type: multipart/alternative; boundary="1417700295.AC082.25699"; charset="UTF-8" --1417700295.AC082.25699 Date: Thu, 4 Dec 2014 13:38:15 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable https://bugs.freedesktop.org/show_bug.cgi?id=3D83510 --- Comment #9 from Henri Verbeet --- (In reply to Marek Ol=C5=A1=C3=A1k from comment #8) > (In reply to Christoph Haag from comment #7) > > I think in the new "Lightroom Interior" the blackness glitch is visible= in a > > more interesting way: > > https://www.youtube.com/watch?v=3DR9N-srsF_Fg >=20 > I think I've tracked down what's causing the blackness in all Unreal Engi= ne > demos: Division by zero. >=20 I didn't debug this of course, but it seems suspicious that this would depe= nd on division be zero returning zero instead of infinity. I don't think any o= ther driver for current hardware does that with GLSL. Are you sure there's not a subsequent multiplication by zero that depends on INF * 0 returning 0 inste= ad of NAN? --=20 You are receiving this mail because: You are the assignee for the bug. --1417700295.AC082.25699 Date: Thu, 4 Dec 2014 13:38:15 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Comment= # 9 on bug 83510<= /a> from Henri Verbeet 
(In reply to Marek Ol=C5=A1=C3=A1k from comment #8)
> (In reply to Christoph Haag from comment #7)
> > I think in the new "Lightroom Interior" the blackness g=
litch is visible in a
> > more interesting way:
> > https:/=
/www.youtube.com/watch?v=3DR9N-srsF_Fg
>=20
> I think I've tracked down what's causing the blackness in all Unreal E=
ngine
> demos: Division by zero.
> 
I didn't debug this of course, but it seems suspicious that this would depe=
nd
on division be zero returning zero instead of infinity. I don't think any o=
ther
driver for current hardware does that with GLSL. Are you sure there's not a
subsequent multiplication by zero that depends on INF * 0 returning 0 inste=
ad
of NAN?

You are receiving this mail because: =20=20=20=20=20=20
  • You are the assignee for the bug.
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