Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: mperdue@iquest.net (Mario Perdue)
Newsgroups: scea.yaroze.beginners
Subject: Re: Ordering Tables
Date: Fri, 30 May 1997 15:07:32 GMT
Organization: SCEA Net Yaroze News
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On Thu, 29 May 1997 19:13:30 GMT, jamin1@psu.edu (Jamin Frederick)
wrote:

>	I've been programming some 2d stuff for like a week and
>a half now and I still haven't figured out how big the PACKETs
>need to be.  You need enough space for each basic thing you stick
>in the OT.  It hasn't been real clear to me yet, though, exactly how
>the OT, packets, and tags are structurally organized.

I've been told that a basic rule of thumb for packet size is the
maximum number of objects to be drawn times twenty-four (MAX_OBJ*24).
This works most of the time. This all falls under the heading of PSX
Voodoo. If there's anyone out there who has a better handle on this,
feel free to jump right in.

>	You need two OTs, two tag arrays and two PACKET arrays.
>since the playstation does two things at once: displaying and drawing.
>So while its drawing with one OT, tag array, and PACKET, it's
>displaying the other set.  The programmer doesn't really have to worry
>about this, though.  Its always done the same way.  You stick things
>like lines, sprites, and boxes into the "currently active"  OT, sort
>them, and draw them, just make sure you do the sorting/drawing in the
>right order, per the demos.  The switch to the opposite set is done
>at every screen refresh, when the opposite buffer is now "active".
>Actually, the loop present in all the demos is only going around once
>per screen refresh, since one of the commands, VSync(0), pauses
>execution until the screen is ready to be refreshed.

I don't see a question in this paragraph, so I'll just agree with you.
8^)

Mario