Path: chuka.playstation.co.uk!news
From: ScoTT Campbell <escotia@escotia.freeserve.co.uk>
Newsgroups: scee.yaroze.programming.2d_graphics
Subject: Re: LoadImaga and FntPrint
Date: Sun, 04 Oct 1998 00:00:29 +0100
Organization: PlayStation Net Yaroze (SCEE)
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References: <6ug1n0$ja96@chuka.playstation.co.uk> <6uidgd$ja915@chuka.playstation.co.uk> <360CCEB5.F14D6B01@scee.sony.co.uk> <36165A7C.773C47C2@escotia.freeserve.co.uk>
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Ah.

I've found out how to clear the screen every loop. (GsDRAWENV).

Cheers

ScoTT

ScoTT Campbell wrote:

> I'm trying to use MoveImage() to create a tiled background.
>
> The solutuion you give does work, but I'm totally confused as to why.
>
> Also, I want to clear the screen every loop since the background will not take up the whole screen, so
> how would I do that? If I use GsSortClear() I clear away what I've just moved in.
>
> Cheers
>
> ScoTT
>
> James Russell wrote:
>
> > Ok, solved.
> >
> > The problem is twofold:
> >
> > 1) You are LoadImaging the image into the right area at the wrong time.
> > 2) You were doing a GsSortClear, which is only necessary if you are using a large image as the
> > background.
> >
> > This meant that you were clearing the screen, drawing the drawing the debug text, then loading the
> > image over the top of it all.
> >
> > The GsDRAWENV variable holds information about the CURRENT drawing area. This can get quite
> > confusing, because the current drawing area (which is what the GPU is using), is NOT the same as the
> > area which the CPU is building its packets for in the OT. Remember, the screen is displaying buffer
> > X, the GPU's drawing area is set to buffer 1-X, and the CPU is building packets up for the new
> > buffer X. The following code works fine:
> >
> > Maurice Sibrandi wrote:
> > >
> > >     GsClearOt(0, 0, &otWorld[nActiveBuf]);    // Clear the OT for buffer X
> > >
> > >     FntPrint(nFontstream[0], "~c090No problem : this text is visible");
> > >
> > >               // Create packets and sort objects in here...
> > >
> > >     // wait for end of non-blocking routines and wait for vsync
> > >     DrawSync(0);
> > >     VSync(0);
> > >     GsSwapDispBuff();
> > >               // Load in the new background
> > >     setRECT(&rc, 0, GsDRAWENV.clip.y, imgBack.pw, imgBack.ph);
> > >     LoadImage(&rc, imgBack.pixel);
> > >               // Draw the new objects on top of the background
> > >     GsDrawOt(&otWorld[nActiveBuf]);
> > >               // Draw the debug info on top of that.
> > >     FntFlush(-1);
> >
> > Cheers,
> >
> > James
> >
> > --
> > == James_Russell@scee.sony.co.uk                +44 (171) 447-1626
> > == Developer Support Engineer - Sony Computer Entertainment Europe
> >
> > A cynic smells flowers and looks for the casket.