Path: chuka.playstation.co.uk!news
From: Giulio <giulio@mbox.ulisse.it>
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Re: Need help with backgrounds in hi-res mode
Date: Sat, 01 Nov 1997 23:58:29 +0100
Organization: PlayStation Net Yaroze (SCEE)
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To: dsyaroze@concentric.net

Scott Cartier wrote:
> 
> Okay, I eliminated everything from my program except
> the background routines and it *still* flickers (in
> low-res mode it works fine).  No sprites or anything
> else is being sorted - just the background.  I really
> need help figuring this one out.  The code is below.
> 
> Any ideas (even just random thoughts) would be
> helpful.  Thanks!
> 
> Scott

Hi,
maybe I'am wrong but I think it's normal that a program "flicker" at
high res (y>240 pixels in NTSC) because you loose the double buffering
feature that prevents flicker free images. In double buffer mode (y<240
in NTSC or 256 in PAL) you have a buffer to draw an image and
simultaneously a buffer to display an image. If you go in Interlaced
buffer ( y>...) you have to draw the image directly to the buffer that
is being displayed so it flickers.
I'm telling you this because I'have coded a program that display a
512x240 backgraound using the GsBG library and the code you have posted
seems rigth. More over if at low res you have no problems the error (but
I think there's no error) must be in the little code that change to high
res (Interlaced buffer).
If I'am wrong please tell me!It's only an idea...
 

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