Path: chuka.playstation.co.uk!news
From: "Rad" <rad@cyberdude.com>
Newsgroups: scee.yaroze.programming.2d_graphics
Subject: Re: Filling the screen with boxes
Date: Sun, 27 Dec 1998 02:02:19 -0000
Organization: PlayStation Net Yaroze (SCEE)
Lines: 77
Message-ID: <76454k$22910@chuka.playstation.co.uk>
References: <762se1$2296@chuka.playstation.co.uk> <763r2u$2299@chuka.playstation.co.uk>
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Doh! I too have fallen victim to allocating insufficient packet space and
after I said "I've made sure my gpu packet area is big enough"!!!

Ok, thanks anyway Mario.

Mario Wynands wrote in message <763r2u$2299@chuka.playstation.co.uk>...
>>
>>// declaration
>>
>>GsBOXF box[80][60];
>
>
>You probably don't need to do this.  Using a single GsBOXF structure and
>modifying the attributes on the fly within your drawing loop will save a
lot
>of memory (once you use a structure to put stuff in an ordering table you
>can modify its attributes and reuse it without affect previous entries in
>the ordering table).  Same principle also works for sprites etc.
>


I need to store the values and reuse them for the next frame. Although I
could save a small amount of memory by using one GsBOXF variable and
defining an array of integers i.e. int box[80][60]; but this would be
slightly slower because I would have to copy the values from each array into
the GsBOXF variable before registering it into the odering table.

>>// drawing
>>
>>for (y = 0; y < 240; y++)          // this needs to be "for (y = 12; <
240;
>>y++) " to work
>>  for (x = 0; x < 320; x++)
>>    GsSortBoxFill(&box[x][y], &WorldOT[acvtiveBuffer],0);
>
>
>This doesn't look right.  Given the array declaration at the top you are
>overstepping the boundaries of your array (80x60) using this loop
(320x240).
>Something like


Yeah, this is wrong but only in this example.

>Also, for slightly more flexible code try using 'defines' a bit more.  That
>way when you change the parameters of your algorithm you don't have to go
>through your code and change stuff everywhere.


Again I do use defines, I just didn't use them in the example as I wanted to
keep it short.

>Hope this helps
>

Yep, it made me have one last look at my code after hours of trying to
figure out why it didn't work!

>
>Mario Wynands
>
>Director/Project Manager, Sidhe Interactive
>Sony Playstation Software Development House
>
>Email mario@sidhe.co.nz Website www.sidhe.co.nz
>


Thanks again,

Rad.
rad@cyberdude.com
http://www.netyaroze-europe.com/~radpsx

BTW what are you guys up to at Sidhe Interactive?