Re: [gl4java-usergroup] glVertexPointer question

[Kenneth B. R. <kbr...@al...>]

> From: Andy Lubbers <do...@ya...>
> 
> Has anyone sucessfully used a direct
> java.nio.ByteBuffer in a glVertexPointer
> statement.  I have been able to get something
> drawn on the screen if i pass a float[] into
> glVertexPointer, but nothing shows up if I pass a
> Buffer into it.

Yes. See http://java.sun.com/products/jfc/tsc/articles/jcanyon/ ;
links to the source code are near the bottom of the page.

It's probably the byte ordering; you need to call
ByteBuffer.order(ByteOrder.nativeOrder()) when your ByteBuffer is
first created. I have made this mistake in 100% of my own
java.nio programs which is why I recommend making a
BufferFactory class which does it up front; see the slides of
http://servlet.java.sun.com/javaone/sf2002/conf/sessions/display-3167.en.jsp

-Ken