[PD] GEM on raspberry pi

Ali Momeni batchku at gmail.com
Mon Sep 9 17:00:31 CEST 2013

Hello all,
My bad, UDOO supports OpenGL ES 2.0 and OpenVG.
So getting GEM working on it is closer to the RPi than i thought.

Are the porting efforts of GEM for RPi being documented somewhere?
Is IOhannes m zmölnig still working on GEM?


On Mon, Sep 9, 2013 at 10:53 AM, Dan Wilcox <danomatika at gmail.com> wrote:

> It's not that the RPI doesn't support OpenGL, it's that it's using OpenGL
> ES which drops some of the earlier GL 1.1 api, mainly intermediate mode.
> GEM can/will work fine on RPI if it's api is updated a bit to support ES
> (or through an emulation layer like glshim). This is a good idea in the
> long term anyway, since newer implementations of GL (3.3+) are also
> dropping support for the "old way" of doing things.
> I've long thought that GEM could be ported to work on iOS, but I haven't
> had a need for it so haven't looked into it. In that case, there would need
> to be some function wrapping to support the old GL API, but this has
> already been done in libraries like OpenFrameworks, so they could be used
> as a template. Simple things like using a vertex array when setting vertex
> points in intermediate mode, etc ...
> If the Udoo board has a regular GL 1.1, 2+ stack then it should work fine
> with GEM without any changes ... except that, unlike the RPI, it will
> require running X11 in order to use XGL. OpenFrameworks on the RPI, for
> instance, uses GLES without X11 and thereby doesn't waste resources on the
> windowing system. In my experience with embedded Linux system, it's best to
> ditch X if you truly do not need it. ON my old setup, X took almost 100 MB
> of ram on my 256 MB system. Running my custom SDL visual app directly to
> the framebuffer took only 1 couple of MBs by comparison.
> Then again, embedded systems nowadays have more and more resources to burn
> so it may work without having to be frugal. (although efficiency is still
> important IMO).
> On Sep 9, 2013, at 10:03 AM, pd-list-request at iem.at wrote:
> *From: *Ali Momeni <batchku at gmail.com>
> *Subject: **Re: [PD] GEM on raspberry pi*
> *Date: *September 9, 2013 10:02:52 AM EDT
> *To: *Dan Wilcox <danomatika at gmail.com>
> *Cc: *"pd-list at iem.at List" <pd-list at iem.at>
> hello friends,
> i'm very keen to try GEM/openGL on a Udoo board (http://udoo.org) which
> DOES support OpenGL.
> if anyone is up for trying it i can provide you with a board to try on.
> should be a load of fun :)
> ali
> --------
> Dan Wilcox
> @danomatika
> danomatika.com
> robotcowboy.com
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