From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 98664] Fragment shader while loop causes geometry corruption Date: Thu, 17 Nov 2016 21:57:09 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1846087868==" Return-path: Received: from culpepper.freedesktop.org (culpepper.freedesktop.org [IPv6:2610:10:20:722:a800:ff:fe98:4b55]) by gabe.freedesktop.org (Postfix) with ESMTP id 038C36E8A2 for ; Thu, 17 Nov 2016 21:57:09 +0000 (UTC) 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 --===============1846087868== Content-Type: multipart/alternative; boundary="14794198281.B783d8.573"; charset="UTF-8" --14794198281.B783d8.573 Date: Thu, 17 Nov 2016 21:57:08 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D98664 --- Comment #14 from Nicolai H=C3=A4hnle --- I suspect the reason that the blob drivers do it this way is that if you do= n't, you're likely to hit a subtle bug with emit inside control flow. And making= the effort to exploit the undefined-ness probably pays off very rarely, so... I= 'm about to send out a patch to mesa-dev that might explain this better. In any case, the shader still did the wrong thing according to the spec :) --=20 You are receiving this mail because: You are the assignee for the bug.= --14794198281.B783d8.573 Date: Thu, 17 Nov 2016 21:57:08 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated

Commen= t # 14 on bug 98664<= /a> from Nicolai H=C3=A4hnle 
I suspect the reason that the blob drivers do it this way is t=
hat if you don't,
you're likely to hit a subtle bug with emit inside control flow. And making=
 the
effort to exploit the undefined-ness probably pays off very rarely, so... I=
'm
about to send out a patch to mesa-dev that might explain this better. In any
case, the shader still did the wrong thing according to the spec :)

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