RE: [Algorithms] lights/shadows rendering architecture

[Marc F. <mf...@fr...>]

By the way, thank you for all your answers. I implemented the standard 1
light =3D 1 pass as a starting point and it works nicely. Doing so gave =
me a
better understanding of the whole lighting pipeline and a clean
implementation. From that point, there is plenty of room to =
improvements.

Thanks again.

Marc=20

-----Message d'origine-----
De : gda...@li...
[mailto:gda...@li...] De la part de Tom
Forsyth
Envoy=E9 : jeudi 22 septembre 2005 05:41
=C0 : gda...@li...
Objet : RE: [Algorithms] lights/shadows rendering architecture

There is only 1 GPU, but they have very long pipelines, and they also do =
a
lot of things in parallel. So the front of the pipeline can be trying to =
use
the texture before the end of it has finished, which it can't do, so it =
has
to stall.

TomF.

> -----Original Message-----
> From: gda...@li...=20
> [mailto:gda...@li...] On=20
> Behalf Of Joris Mans
> Sent: 21 September 2005 16:21
> To: gda...@li...
> Subject: RE: [Algorithms] lights/shadows rendering architecture
>=20
>=20
> > That means you'll have a pipeline doing:
> >=20
> > -Render shadowbuffer A
> > *stall*
> > -Use shadowbuffer A
> > -Render shadowbuffer B
> > *stall*
> > -Use shadowbuffer B
> > -Render shadowbuffer C
> > *stall*
> > -Use shadowbuffer C
> > etc.
> >=20
>=20
> Why would the system stall between rendering to shadowbuffer=20
> A and using
> it? Its not like the GPU renders a shadowbuffer which the CPU=20
> has to use
> afterwards. I presume it all gets batched up in the command=20
> queue of the
> GPU, and since there is only 1 GPU the shadowbuffer will be rendered
> before the commands using it will be issued, so no stall, right?
>=20
>=20
> Joris





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