From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jon Smirl Subject: Re: Re: [PATCH] fbdev: colormap fixes Date: Thu, 28 Jul 2005 16:50:08 -0400 Message-ID: <9e47339105072813507c00687e@mail.gmail.com> References: <200507280031.j6S0V3L3016861@hera.kernel.org> <9e473391050728060741040424@mail.gmail.com> <42E8F0CD.6070500@gmail.com> <9e473391050728092936794718@mail.gmail.com> <9e47339105072811183ac0f008@mail.gmail.com> <9e4733910507281315419c3c12@mail.gmail.com> <9e47339105072813213db7cee4@mail.gmail.com> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1DyFKa-0004i2-VP for linux-fbdev-devel@lists.sourceforge.net; Thu, 28 Jul 2005 13:50:16 -0700 Received: from wproxy.gmail.com ([64.233.184.206]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1DyFKa-0005At-2d for linux-fbdev-devel@lists.sourceforge.net; Thu, 28 Jul 2005 13:50:17 -0700 Received: by wproxy.gmail.com with SMTP id i3so505022wra for ; Thu, 28 Jul 2005 13:50:09 -0700 (PDT) In-Reply-To: <9e47339105072813213db7cee4@mail.gmail.com> Content-Disposition: inline Sender: linux-fbdev-devel-admin@lists.sourceforge.net Errors-To: linux-fbdev-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: List-Post: List-Help: List-Subscribe: , List-Archive: Content-Type: text/plain; charset="us-ascii" To: Geert Uytterhoeven Cc: "Antonino A. Daplas" , Linux Frame Buffer Device Development , Linux Kernel Development I've verified now that all ATI R300+ chips have 10bit cmaps. These are pretty common so I'd be in favor of making this into a binary attribute where I can get/set the whole table at once. Given that OpenGL is already supporting 12 and 16 bits these tables are only going to get much larger. 1024 entries * 5 fields * 2 bytes =3D 10KB -- too big for a text attribute. 65536 entries * 5 fields * 2 bytes =3D 655KB -- way too big for a text attr= ibute. The bits_per_pixel sysfs attribute is an easy way to tell how many entries you need. You can just set it at 4, 8, 10, etc until you get an error. Now you know the max. 2^n and you know how many entries. --=20 Jon Smirl jonsmirl@gmail.com ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf