I looked at the GL4Java demos that show how to share a GLContext (share
display lists) between two canvases. They use the inheritence method when
creating a GLCanvas. In my app I am not using the inheritence method for my
GLAnimCanvas. Instead, I am creating the GLAnimCanvas via the
GLDrawableFactory, and I am registering a GLEventListener. So, how do I share
a GLContext in this paradigm?
I'd like to stay with the GLEvenListener, and avoid sub-classing, for several
reasons:
1) GL4Java documentation recommends this method
2) The GLDrawableFactory creates the AnimCanvas properly on all platforms (ie,
no need to worry about X11 vs Win32 visuals)
3) It would require a lot of changes in my app to abandon the GLEventListener
The simple demo program (called MiscDemos\ShardedGLTest.java) just sets the
protected member called SharedGLContext in the parent GLCanvas class. But I
cannot do this because I am not sub-classing. Furthermore, there is no mutator
method (set method) in the GLCanvas class for the SharedGLContext variable.
How can I share my GLContext in this scenario?
I looked at the constructors for the GLContext class, and I see that one of
the constructors takes a sharedContext. But it is not obvious to me how to use
this constructor. Which component do I pass into the constructor (the 1st or
the 2nd, and BTW shouldn't the type of this argument be GLCanvas and not
awt.Component)? More importantly, what do I do with this newly created
GLContext? (Since there is NO set method in GLCanvas that would allow me to
use this new GLContext).
Please help.
-Mark
"Kenneth B. Russell" wrote:
The GLDrawable APIs (largely borrowed from Magician) were added
fairly late, so there is still missing functionality like this.
The underlying mechanism should be available; GLContext can take
a "shared" GLContext in its constructor. There are some
demonstrations (all of which depend on subclassing GLCanvas) of
this functionality in the demos.
> I am porting my application from Magician to GL4Java, and there
are some
> differences in the two APIs that I am trying to figure out.
> Specifically, I was sharing display lists and textures between two
> displays (ie, two GLDrawables) in my app. In the old API, I was
able to
> create my second "GLDrawable" by passing in my first "GLDrawable"
as an
> argument during creation. This linked the two OpenGL state
machines and
> allowed the desired sharing.
>
> Does anyone know the proper way to do this in GL4Java? In the
> GLDrawableFactory class, I saw that createGLAnimCanvas() was
overloaded
> to take the arguments 'glName' and 'gluName', but I don't think
that is
> what I am looking for, is it? We tried getting the Context from
the
> first GLDrawable and setting it in the second GLDrawable, but that
> caused nothing to be rendered at all. Does anyone have some
advice?
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