Re: [gl4java-usergroup] accumulation buffer

[Jiba <a1...@So...>]

Thorsten Roemer wrote:
> 
> Hi *,
> 
> is it right using the accumulation buffer is really _slow_ ?

My own experiments (on a TNT2) show the same thing...

> Regardless of the value of accum bits set, I've 0,5fps in the accanti demo...
> (1GHz, 512Ram, RedHat7.1, GeForce2MX, nvidia-1.0-1251)
> 
> I'm trying to use the accum buffer because I need to set an alpha value to a
> fixed display list with glColor's in it. With the accum buffer I should be
> able to add an already rendered display list with any alpha by glAccum
> (GL_ADD, alpha), right ?
> 
> Is there a way to set the color (r,g,b) without setting the alpha too ?

If I remember, there is an OpenGL extension (maybe not supported by all
card), that allow to add a second alpha value.
I don't remember the name of this extension :-( but OpenGL.org has a doc
that lists all of them; you should look at it.

> regards,
> 
> Thorsten Roemer

Jiba