Path: chuka.playstation.co.uk!news
From: Tom <tm7130@bristol.ac.uk>
Newsgroups: scee.yaroze.programming.2d_graphics
Subject: Re: Transparent screen grabs?
Date: Thu, 22 Oct 1998 11:35:56 +0100
Organization: PlayStation Net Yaroze (SCEE)
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References: <362B0900.27655A77@bristol.ac.uk> <362DD8C8.3290@manc.u-net.com>
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I'm doing it in sort of the way you say, although not quite the same, but
that game phsycon (?) that was of the OUKPSM cover cd did it in 640*480.
Hmmm. I'll give your code a bash and see if I can get it to work.

Tom

James Shaughnessy wrote:

> Yes indeed a good question there.  You say you've tried setting all
> the STP bits for each frame -- but are you setting them while
> on the frame buffer?  This will take in the order of 100,000 HSyncs
> if you are using a LoadImage and a StoreImage for each pixel by my
> reckoning, so as you say causes a rediculous slow-down.
>
> Have you tried StoreImage'ing the whole screen to main memory,
> then doing some speedy bit-masking to all the pixels, then a quick
> LoadImage back to VRAM where the sprite info is?  The code could be:
>
>   RECT screen = {0, activeBuff*240, 320, 240};
>   u_long *mainmem = (u_long *)RESERVED_MEM_ADDR; // or use malloc()
>
>   StoreImage(&screen, &mainmem);
>   for (i=0; i<320*240/2; i++;)
>     mainmem[i] |= (1<<15) + (1<<31);
>   LoadImage(&screen_sprite_area, &mainmem);
>
> Note how TWO pixel STP bits are set for each loop execution, so
> it only (?) needs to loop about 40,000 times.  It's only doing one
> logical OR (as 1<<15 + 1<<31 is evaluated at compile time) so it
> should be plenty quick enough and do the trick if no other bright
> soul comes up with a better solution.
> Later,
> Jim
>
> TEJ Madams wrote:
> > Hi there,
> >          I've been programming the Yaroze for a couple of weeks with
> > a small amount of sucess but I've come across a problem. I wanted to
> > recreate that 'fade to battle' effect in FFVII and I know how it's
> > done but I don't know exactly how to do it.
> --
> -----------------------------------------
> James Shaughnessy    james@manc.u-net.com
> http://www.netyaroze-europe.com/~shaughnj
> -----------------------------------------