Path: chuka.playstation.co.uk!news
From: "Cookie" <gjc53@student.canterbury.ac.nz>
Newsgroups: scee.yaroze.freetalk.english
Subject: Re: Newbie needs basic help
Date: Tue, 20 Nov 2001 10:21:17 +1300
Organization: PlayStation Net Yaroze (SCEE)
Lines: 123
Message-ID: <9tbst4$iq4@www.netyaroze-europe.com>
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By the way, im posting from my work address, hence the different user name,
sorry to confuse :) ( though it looks like im good at it :)
"Cookie" <gjc53@student.canterbury.ac.nz> wrote in message
news:9tbr0p$iq3@www.netyaroze-europe.com...
> Doh, im an idiot! ( no comments please :) )
>
> Yes i cut ,pasted and concatenated the wrong bit of code :) it was late i
> guess.
>
> looks like ive pasted half of the packet code and half of the worldTags
> Code..
>
> Sorry, and thanks for your explanantion below... ive got a better
> understanding of it now..
>
> woo hoo my first bit of code compiled last night, so im on my way :)
>
> look out for more stupid/beginner questions, though this time, i promise
to
> paste the correct information.
>
>
>
> Thanks
>
> Greg ( who's feeling like a big idiot )
>
> "Alex Herbert" <alex@herbs.dabsol.co.uk> wrote in message
> news:9tb0qt$iq1@www.netyaroze-europe.com...
> > Hi Greg,
> >
> > > GsOT_TAG WorldTags[2][NO_OF_SPRITES*sizeof(GsSPRITE)];
> >
> > This is nonsense and is not the way to define the OTs.  OT_TAGs should
be
> > defined:
> >
> > GsOT_TAG WorldTags[2][1<<OT_LENGTH];
> >
> > where OT_LENGTH is the bit depth of your ordering table.
> >
> > The OT is used to represent the z-axis with each array element
> representing
> > a point or plane along the z-axis, 0 being closest to the screen.  So,
if
> > your OT_LENGTH is defined as 4, then you'll have a 4-bit z-axis giving a
> > range of 0 to 15.  Similarly, an OT_LENGTH of 14 will yield a z-axis
depth
> > of 16384.
> >
> > If you're working in 2D then the z-axis is used for sprite priorities.
> I.e.
> > sprites with lower priorities appear in front of sprites with higher
> > priorities.  If several sprites are sorted at the same priority then the
> > first one sorted will appear on top.
> >
> > The reason the array is 2 dimensional is because an OT (being a table)
is
> a
> > 1 dimensional array, and you've got 2 of them - the one you're preparing
> and
> > the one the GPU is drawing.  Note that when calling GsClearOt and
> GsDrawOt,
> > a pointer to either WorldTags[0] or WorldTags[1] is used to select which
> of
> > the 2 OTs should be cleared/drawn.
> >
> > Check out pages 17-18 of the Library Reference which sort of give an
> > explanation - ish.  Also look at the source code for the 'check' program
> on
> > the Yaroze CD.
> >
> > Hope this helps.
> >
> > Alex
> >
> >
> > "Greg Cook" <gjc53@student.canterbury.ac.nz> wrote in message
> > news:9t76in$ob42@www.netyaroze-europe.com...
> > > Thanks for the explanation of the struct stuff, thats great..
> > >
> > > as for the second part.. i think i asked the question wrong.
> > >
> > > From looking at the reference manual how did you know to define the
code
> > > below?
> > >
> > > GsOT_TAG WorldTags[2][NO_OF_SPRITES*sizeof(GsSPRITE)];
> > >
> > > looking at the reference manual theres not example of how to
define/use
> > the
> > > structure, so how did you know to define it as 2d? i know the example
> code
> > > that sony has supplied shows it define like what is abo ve, but apart
> from
> > > seeing that would anyone of known how to define/use the structure.
> > >
> > > again not sure if im putting the question the right way, all im trying
> to
> > > say is i wouldnt of known to write the code like above from just
looking
> > at
> > > the reference manual ( i wouldnt of known to use 2 dimensions etc )
the
> > only
> > > way i know how to do it is because theres a sample bit of code
provided
> by
> > > sony..
> > >
> > > anyways i'll keep playing
> > >
> > > Greg
> > >
> > >
> >
> >
> >
>
>