Posted by Sven Gothel on Jul 17, 2012; 4:20pm
URL: https://forum.jogamp.org/replacing-custom-jni-bindings-for-jogl-tp4025551p4025552.html

On 07/17/2012 05:36 PM, siddharth_univ [via jogamp] wrote:
> Hi guys,
>
> We currently have our own jni bindings to opengl for our in house renderer.
> The bindings to opengl are pretty old and have not been updated in a long
> time. I would like to replace these bindings with jogl. I would not like to
> change the interfaces from this application level since they are many usages
> of it higher up in the application.

You could do a [1] wrapper,
[2] a custom binding requiring you to create your custom JOGL
[3] or change your code .. which you don't like.

Since we don't know how much your current binding looks like
no statement can be given about the costs of [2].

>
> Can some of you experienced folks give advice on best practices or tips on how
> you would replace and entire application tier using java bindings to opengl to
> use jogl underneath it?

Many use some agnostic wrappers, read: delegation to JOGL.

>
> Should i look at how gluegen works? I have used jogl only as a hobby and i
> havent looked deep into its architecture.

Look at GlueGen's unit tests .. I guess thats a good start.
There is one detailed binding test .. generation and validation
of GlueGen itself.

>
> Is there a way i can define how the interface should look like to match what
> we in our renderer?

Depends ..

Even for [1] you could use GlueGen to create a wrapper,
see how TraceGL* is created.

Currently the naming solely depends on:
  - the header files
  - the build-in type explosion: arrays, NIO-buffer, ..

However, I doubt it's more cost effective to do [1] or [2].
Don't underestimate the costs of testing and fixing regressions.
JOGL, as-is, is well tested on all supported platforms
via our CI - have a look at our Jenkins build server.

[3] seems to be the most safe way, you can even try to use
and automatic conversion w/ jackpotc, see 'jogl/tools/jackpotc'.

(We haven't tested conversion using jackpotc for a long time though ..)

>
> thanks
>

Hope that helps a bit.

~Sven