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 09:49:05 +1300
Organization: PlayStation Net Yaroze (SCEE)
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Message-ID: <9tbr0p$iq3@www.netyaroze-europe.com>
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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
> >
> >
>
>
>