Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: mperdue@iquest.net (Mario Perdue)
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Re: More GsBG questions
Date: Fri, 25 Apr 1997 02:18:55 GMT
Organization: SCEA Net Yaroze News
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Ed,

Sorry, that was an early morning answer. It seemed to make sense at
the time :^). I should have referenced some of my code before
answering. 

Now that I've done that, it still looks like the GsSwapDispBuff()
function call sets up other parameters that (apearently) affect
GsSortClear(). You're right though, it's probably not the clipping
rect. I'll try to find out specifically what is affected and get back
to you. You've got me wondering now, so I'll get right on it.

As for why the GsSortClear() doesn't require a priority. I would say
that's because GsSortClear() is intended to clear the entire display
and doesn't need to worry about z-depth like the other GsSort
functions do.

Sorry if I've added to the confusion factor. Remember, I'm fairly new
to this too.

Mario
 
On Thu, 24 Apr 1997 17:28:23 -0500, Ed Federmeyer
<fedeedw@charlie.cns.iit.edu> wrote:

>But I guess the thing I don't understand, is that when you say "it does
>exactally what you told it to do and clears the screen", I think
>it should mean "it puts a command to clear the screen into the OT, so
>that later, when you DrawOT(), the first GPU command is 'clear the
>current screen'".  In other words, *none* of the Sort() funcs act
>immediatly, but just stuff a draw command into the OT.  If that is the
>case, it should not matter where the clipping rectangle is when I issue
>the SortClear call, but rather, when the rest of the OT is rendered to
>the screen, the first thing "rendered" is a big, black rectangle
>covering the screen area we are about to draw into.
>
>Maybe if I understood why GsSortClear does not require a priority
>like the other Sort() funcs...
>
>EdF
>
>EdF