Re: FW: [gl4java-usergroup] animation stutters

[Elias N. <na...@od...>]

On Wednesday 30 October 2002 20:08, Peter wrote:
> > > One definite difference between my code and JCanyon is that I'm not
> > > using the NIO direct buffers, though OTOH I'm using display lists,
>
> so
>
> > > that shouldn't matter beyond the initial access.
> >
> > no, that is not correct. Java can move your vertex/normal/whatever
>
> arrays
>
> > around underneath you before your get the chance to call
>
> glArrayElement
>
> > (or
> > similar).
>
> As I said in my post, I'm using *Display Lists*.  It doesn't matter wha=
t
> happens to the arrays after the lists are made (altering the arrays has
> no effect on the data stored in the list whatsoever)
>

Your arrays can be moved around *before* you create the display list, and=
=20
after you specify the array. To create a display list your would do somet=
hing=20
like this:

float[] vertex_array;
int[] indices;

=2E..

glVertexPointer(..., vertex_array);

=2E..  <- It it here, between the array call, and the draw call that your=
 vertex=20
data arrays can move around.

glDrawElements(...., indices);

And yes, that gap between glVertexPointer and glDrawElements is normally =
very=20
small, but believe me, it can happen.

 - elias