Re: [osg-users] OSG and Android

2013-01-11 Thread Jason Daly 

On 01/11/2013 04:48 AM, Jan Ciger wrote:


On Fri, Jan 11, 2013 at 1:28 AM, Jason Daly > wrote:


Actually, we've got shared library loading working already.

A lot of our software is plugin-based (using dlopen), and it's
working fine on Android.  There is a bit of JNI involved, but only
enough to hook into the regular Android GUI/View stuff.


Ah, that's good news then. Would you mind to publish any changes you 
needed to do to it? I would love to switch to shared lib too, because 
with the static linking the recompiles are taking ages every time.





I will if I can.  I doubt I'll be able to, though.  I'm frantically 
trying to finish this up before I switch jobs next week, and I've got a 
few other things on the plate, too.  My outside work time is pretty full 
too, with moving and stuff.


I'm currently doing things like writing the Android.mk file manually for 
our specific build tree, which is fine for the guys here, but probably 
wouldn't do for OSG in general.


If nothing else, I could give you what I end up with and you (or someone 
else) could massage it into a nice, CMake-friendly form if you like.


--"J"

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Re: [osg-users] OSG and Android

2013-01-11 Thread Jan Ciger 
On Fri, Jan 11, 2013 at 1:28 AM, Jason Daly  wrote:

> Actually, we've got shared library loading working already.
>
> A lot of our software is plugin-based (using dlopen), and it's working
> fine on Android.  There is a bit of JNI involved, but only enough to hook
> into the regular Android GUI/View stuff.
>

Ah, that's good news then. Would you mind to publish any changes you needed
to do to it? I would love to switch to shared lib too, because with the
static linking the recompiles are taking ages every time.

Regards,

Jan
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Re: [osg-users] OSG and Android

2013-01-10 Thread Jason Daly 

On 01/10/2013 06:32 PM, Jan Ciger wrote:

On 01/10/2013 11:49 PM, Jason Daly wrote:

OK, if that's all it is, I'm going to give it a shot.

After fighting a bit with the platform, we've had some luck with getting
other libraries working as shared libraries, so I think we'll be OK here.

It's compiling now and seems to be reasonably happy. Of course, as you
pointed out, compiling and linking is the easy part :-)

I think you will have most problems with actually using plugins (unless
you keep them linked in statically). I don't think that there is a
documented interface how to load shared libs at runtime from C/C++ on
Android, you have to load the shared libs from within Java code.

If you compile all of OSG into one large shared lib and try to load that
at runtime instead of static linking, that should be possible without
too much hassle - e.g. Qualcomm's Vuforia/QCAR is doing it, OpenCV is
doing it, etc. Just make sure to set the lib up as "prebuilt", so that
it gets actually included in your APK and deployed on the device properly.


Actually, we've got shared library loading working already.

A lot of our software is plugin-based (using dlopen), and it's working 
fine on Android.  There is a bit of JNI involved, but only enough to 
hook into the regular Android GUI/View stuff.


--"J"

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Re: [osg-users] OSG and Android

2013-01-10 Thread Jan Ciger 

On 01/10/2013 11:49 PM, Jason Daly wrote:

OK, if that's all it is, I'm going to give it a shot.

After fighting a bit with the platform, we've had some luck with getting
other libraries working as shared libraries, so I think we'll be OK here.

It's compiling now and seems to be reasonably happy. Of course, as you
pointed out, compiling and linking is the easy part :-)


I think you will have most problems with actually using plugins (unless 
you keep them linked in statically). I don't think that there is a 
documented interface how to load shared libs at runtime from C/C++ on 
Android, you have to load the shared libs from within Java code.


If you compile all of OSG into one large shared lib and try to load that 
at runtime instead of static linking, that should be possible without 
too much hassle - e.g. Qualcomm's Vuforia/QCAR is doing it, OpenCV is 
doing it, etc. Just make sure to set the lib up as "prebuilt", so that 
it gets actually included in your APK and deployed on the device properly.


Regards,

Jan
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Re: [osg-users] OSG and Android

2013-01-10 Thread Jason Daly 

On 01/10/2013 05:16 PM, Jorge Izquierdo Ciges wrote:


Because the shared linker at execution time in Android works as hell 
on a bench. It just doesn't call the dependencies of a library... and 
also your shared libraries are not installed on the system... etc


The system is just not friendly to use shared libraries.

Can OSG be used as a shared library... if you modify it yourself yes. 
There are some crashes here and there but it's functional. But then 
you'll have to face all the other worryes of installing the shared 
libraries... where... for each application and create an ordered 
library opener. OpenCV had to create another program just to deploy 
it's own shared libraries.


P.S. Oh and I was forgetting that the shared linker on Android when a 
library has failed to load then it won't try load that library even if 
you want to force him until he's forgotten the library (mainly when 
you kill your process)



OK, if that's all it is, I'm going to give it a shot.

After fighting a bit with the platform, we've had some luck with getting 
other libraries working as shared libraries, so I think we'll be OK here.


It's compiling now and seems to be reasonably happy.  Of course, as you 
pointed out, compiling and linking is the easy part  :-)


--"J"

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Re: [osg-users] OSG and Android

2013-01-10 Thread Jorge Izquierdo Ciges 
Because the shared linker at execution time in Android works as hell on a
bench. It just doesn't call the dependencies of a library... and also your
shared libraries are not installed on the system... etc

The system is just not friendly to use shared libraries.

Can OSG be used as a shared library... if you modify it yourself yes. There
are some crashes here and there but it's functional. But then you'll have
to face all the other worryes of installing the shared libraries...
where... for each application and create an ordered library opener. OpenCV
had to create another program just to deploy it's own shared libraries.

P.S. Oh and I was forgetting that the shared linker on Android when a
library has failed to load then it won't try load that library even if you
want to force him until he's forgotten the library (mainly when you kill
your process)

GoodLuck

2013/1/10 Jason Daly 

>
> I had a question about compiling OSG on Android.  I understand that the
> current advice is to build static libraries instead of shared.  I was just
> wondering why this was the case.  Is there some reason that the OSG can't
> be built with shared libraries instead?
>
> The main reason I'm asking is that I'd prefer to avoid having to specify
> the plugins in the code, and use the normal dynamic loading mechanism, if
> possible.
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[osg-users] OSG and Android

2013-01-10 Thread Jason Daly 


Hi, all,

I had a question about compiling OSG on Android.  I understand that the 
current advice is to build static libraries instead of shared.  I was 
just wondering why this was the case.  Is there some reason that the OSG 
can't be built with shared libraries instead?


The main reason I'm asking is that I'd prefer to avoid having to specify 
the plugins in the code, and use the normal dynamic loading mechanism, 
if possible.


--"J"
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