From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 79223] extra vsync when reading back pixels in xbmc Date: Sun, 25 May 2014 20:20:36 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1392707146==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id D81DD6E1BE for ; Sun, 25 May 2014 13:20:35 -0700 (PDT) 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 --===============1392707146== Content-Type: multipart/alternative; boundary="1401049235.C5F70.369"; charset="us-ascii" --1401049235.C5F70.369 Date: Sun, 25 May 2014 20:20:35 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=79223 --- Comment #2 from Pierre Ossman --- Ok, so it is glReadPixels() that is waiting for vsync. I added some measurements around that call and it is definitely where the delay happens. For good measure I removed the mapping (step 2) and the extra render (step 4). So it does seem that glReadPixels() is simply broken and isn't doing the nice asynchronous read is it supposed to. Oddly enough I could not reproduce the problem with a simple test program. So there is something else required to provoke the issue. Ideas? -- You are receiving this mail because: You are the assignee for the bug. --1401049235.C5F70.369 Date: Sun, 25 May 2014 20:20:35 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 2 on bug 79223 from 
Ok, so it is glReadPixels() that is waiting for vsync. I added some
measurements around that call and it is definitely where the delay happens.

For good measure I removed the mapping (step 2) and the extra render (step 4).
So it does seem that glReadPixels() is simply broken and isn't doing the nice
asynchronous read is it supposed to.

Oddly enough I could not reproduce the problem with a simple test program. So
there is something else required to provoke the issue.

Ideas?

You are receiving this mail because:
  • You are the assignee for the bug.
--1401049235.C5F70.369-- --===============1392707146== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel --===============1392707146==--