Path: chuka.playstation.co.uk!news
From: SCEE TECH <ps_yaroze@interactive.sony.com>
Newsgroups: scee.yaroze.beginners
Subject: Re: Backgrounds
Date: Fri, 20 Jun 1997 14:38:31 +0100
Organization: Sony Computer Entertainment Europe
Lines: 46
Message-ID: <33AA87D7.6184@interactive.sony.com>
References: <01bc7d95$a546a200$cb56eccd@nsantos>
Reply-To: N/A-Use-Newsgroups
NNTP-Posting-Host: 194.203.13.10
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.01 (Win95; I)

Nelson Santos wrote:
> 
> I read a couple of messages regarding displaying an entire 320x240 image on
> the screen.  If you want an easy and crude way of doing it, you can use the
> LoadImage to move the entire image into your display and swap buffers
> instead of using 2 sprites, and just use a main loop that does nothing but
> swap buffers.  Like this:
> 
> ...
>    GsGetTimInfo((u_long *)(PICTURE+1),&Image);
>    Rect.x = 0;
>    Rect.y = 0;
>    Rect.w = 320;
>    Rect.h = 240;
>    LoadImage(&Rect,Image.pixel);
>    Rect.y = 240;
>    LoadImage(&Rect,Image.pixel);
> 
>    while(PadRead(1) != PadSelect)
>    {
>       Buffer = GsGetActiveBuff();
>       GsSetWorkBase((PACKET *)Packet[Buffer]);
>       GsClearOt(0,0,&OT[Buffer]);
>       DrawSync(0);
>       VSync(0);
>       GsSwapDispBuff();
>       GsDrawOt(&OT[Buffer]);
>    }
> ...
> 
> This is not useable for background images in games and only works with
> images that includes the CLUT information in the data, but it's a great way
> to do a quick display of a title image for example.
> 
> Nelson.

-- One nice advantage of this LoadImage method is that you can
specify the TIM coordinates as those of one draw/display buffer in VRAM
eg topleft (0, 0) and (w,h) as (320, 240);
this means you can fit more things into the rest of VRAM,
and so a large title screen need not hinder use of game textures.

GsSPRITEs will enable you to display images very flexibly;
each one can only show 256by256 pixels of frame buffer, but if
you have a larger TIM than 256x256, show it using more than 
one sprite.