Re: [Dri-devel] Memory management fix

[Tom F. <fl...@ct...>]

On Tue, 21 Dec 1999, Allan Schaffer wrote:

> On Dec 20,  8:49pm, Daryll Strauss wrote:
> > On Mon, Dec 20, 1999 at 10:11:59PM -0600, Brynn Rogers wrote:
> > > The Billboards in the performer town demo are much better, but there
> >   is still something extremly fishy about them.  When viewed from a good
> >   distance, one appears black on white and performance is fast (15fps?).
> >   Once you get just close enough it goes
> > > reverse video (white on black), and performance drops to .3 FPS,  AND
> [...]
> > 
> > I suspect, performer is acting differently depending on the level of
> > detail. 
> 
> Is this in reference to billboard nodes (planar objects that spin to face 
> the viewer, like the trees) or a real "Billboard" on the side of the road?

This is in reference to the road sign billboard in the town that has the
Paradigm and SGI logos on it.  Previously under Mesa-3.1beta* and under
the TNT Ultra driver the sign was black text on white background.  I think
I've seen this once under Irix when I had compiled perfly myself to use
the OpenGL version of Performer (as opposed to IrisGL).  I just ran the
town under s/w only Mesa-3.1 (not beta), the sign is white text on black
background.  Nothing changes as one gets closer to the sign in s/w only
Mesa.  

> If the latter (geometric road signs), then this could be our fault.

Actually, it seems to depend on the underlying GL and how it handles that
one-component texture.  We (performer) don't do anything special here.
What you refer to as possibly being our fault is whether it is supposed to
be black on white or white on black.  Given this latest run un s/w only
Mesa, I'm not sure anymore what the "correct" colors should be.  I'll see
if I can re-create the black on white result on Irix again.

As far as the performance problem, I don't think we really have any
control over that at the Performer level.

> I do recall there being a "credits" road sign out in the distance
> somewhere that we were having endianness problems with in the initial
> Beta.  I thought it was fixed (at least in Mesa) but if this is what 
> you were referring to we can check it out.
> 
> Allan
> 
> -- 
> Allan Schaffer                                            al...@sg...
> Silicon Graphics                           http://reality.sgi.com/allan
> 
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