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On 07/19/2010 08:34 PM, Adam B wrote:
> This is an excellent example, Robert. Exactly what I was looking for.
> Any plans to post it to the wiki? Would you like me to do that?
>
> On Sun, Jul 18, 2010 at 10:14 PM, Adam B <[email protected]
> <mailto:[email protected]>> wrote:
>
> Excellent! Thanks, Robert. I'll start reading through the code
> tomorrow after work. I'll keep you posted.
>
>
> On Sat, Jul 17, 2010 at 8:51 PM, Robert Bragg
> <[email protected] <mailto:[email protected]>> wrote:
>
> Hi Adam,
>
> Excerpts from Adam B's message of Sat Jul 17 18:58:12 +0100 2010:
> > Hello all,
> >
> > This page touts the benefits of COGL over raw OpenGL:
> > http://wiki.clutter-project.org/wiki/Cogl. I'm really excited
> about the
> > pango text rendering and vertex/pixel buffer abstractions.
> I'd like to give
> > COGL a try for a 3D game project but I've not been able to
> find good
> > examples or documentation for COGL.
>
> The Cogl reference manual can be found here:
> http://docs.clutter-project.org/docs/cogl/1.0/ but sadly there
> aren't
> currently any comprehensive introductions to Cogl.
>
> I have to confess I was a bit cheeking claiming a few features
> on that
> page that don't exist yet (so as to motivate me to implement
> them) but
> luckily the features you want do already exist :-)
>
> I'd love to encourage people to pick up Cogl for games so I'm
> eager to
> help if I can. In general Cogl still isn't a very mature API so
> we are
> still working hard on exposing more features, but hopefully we cover
> enough already for your game.
>
> >
> > Would some kind sole please show me a simple COGL program that:
> > 1) sets up a fullscreen COGL window (perspective projection)
> > 2) draw a spinning 3D cube or triangle
> > 3) draw the text "Hello COGL" in front of the spinning cube
> > 4) draw text showing the current mouse coordinates
> >
> > I'd guess that the above example could probably be with the
> high-level
> > clutter framework (actors etc), but the bigger goal is a 3D
> game where I
> > need something closer to raw opengl api. I also realize that
> COGL cannot
> > (currently) work without clutter. I'm just looking for the
> minimal amount
> > of clutter code to use COGL.
>
> I've written an example program that should demonstrate all of the
> above. It's quite verbose because it doesn't use much of the
> convenience
> that Clutter offers and because I tried to comment it quite
> heavily. The
> source can be compiled like:
> $ gcc -g3 -O0 -o crate crate.c `pkg-config --cflags --libs
> clutter-x11-1.0`
>
> It assumes you have an image named "crate1.jpg" in the current
> directory
> when run. You can fetch the image I used with:
> $ wget http://www.20threed.com/images/tuts/crate1.jpg
>
> I have to mention it doesn't start fullscreened by default
> because I was
> actually seeing some window sizing problems with fullscreening when
> testing myself and since I didn't have a chance to debug that
> yet I made
> the 'f' key toggle fullscreen mode instead. It might work for you.
>
> If you have any further questions about Cogl please don't
> hesitate to
> ask!
>
> kind regards,
> - Robert
Robert,
Are there any specific requirements for this example. It segfaults on my
Fedora 13 install.. Here is the backtrace..
(gdb) bt
#0 0x00000038ad0329a5 in raise () from /lib64/libc.so.6
#1 0x00000038ad034185 in abort () from /lib64/libc.so.6
#2 0x00000038ae861ea4 in g_assertion_message () from
/lib64/libglib-2.0.so.0
#3 0x00000038ae862450 in g_assertion_message_expr ()
from /lib64/libglib-2.0.so.0
#4 0x00000038c72b0d96 in clutter_backend_glx_handle_event (
backend_x11=<value optimized out>, xevent=0x7fffffffdd00)
at clutter-event-glx.c:85
#5 0x00000038c72bb085 in events_queue (source=<value optimized out>,
callback=<value optimized out>, user_data=<value optimized out>)
at ./clutter-event-x11.c:1013
#6 clutter_event_dispatch (source=<value optimized out>,
callback=<value optimized out>, user_data=<value optimized out>)
at ./clutter-event-x11.c:1158
#7 0x00000038ae83bd02 in g_main_context_dispatch ()
from /lib64/libglib-2.0.so.0
#8 0x00000038ae83fae8 in ?? () from /lib64/libglib-2.0.so.0
#9 0x00000038ae83fff5 in g_main_loop_run () from /lib64/libglib-2.0.so.0
#10 0x00000038c726bced in clutter_main () at ./clutter-main.c:893
#11 0x000000000040240a in main (argc=1, argv=0x7fffffffe158) at crate.c:527
rpm -qa clutter\*
clutter-gtk-devel-0.10.4-1.fc13.x86_64
clutter-imcontext-0.1.6-1.fc13.x86_64
clutter-gst-1.0.0-1.fc13.x86_64
clutter-gst-devel-1.0.0-1.fc13.x86_64
clutter-doc-1.2.8-1.fc13.x86_64
clutter-gesture-0.0.2-2.fc13.x86_64
clutter-1.2.8-1.fc13.x86_64
clutter-gtk-0.10.4-1.fc13.x86_64
clutter-devel-1.2.8-1.fc13.x86_64
Thanks,
Kevin
- --
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