Path: chuka.playstation.co.uk!news
From: Alex Herbert <aherbert@ndirect.co.uk>
Newsgroups: scee.yaroze.programming.2d_graphics,scee.yaroze.beginners,scea.yaroze.programming.2d_graphics
Subject: Re: Need help with arrays
Date: Tue, 18 Aug 1998 19:16:33 +0000
Organization: PlayStation Net Yaroze (SCEE)
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Chris Searle wrote:

> Hi, I've got an array, u_long line[640], and want to copy a random 320
> chunks to a two-dimensional array here some source:
>
> #include <stdio.h>
> #include <libps.h>
> #include <memory.h>
>
> u_long scr[240][320];
> u_long line[640];
>
> main() {
>   RECT screen;
>   short counter;
>
>   SetVideoMode(MODE_PAL);
>   GsInitGraph(320, 240, 4, 0, 0);
>   GsDefDispBuff(0, 0, 0, 0);
>
>   screen.x = screen.y = 0;
>   screen.h = 240;
>   screen.w = 320;
>
>   for( counter = 0; counter < 640; counter++) {
>     if(rand()%2) line[counter] = (1<<15) + (31<<10) + (31<<5) + 31; //set
> pixels to
>     else line[counter] =  (1<<15);                                  //black
> or white
>   } // setup first array
>
>   while(1) {
>     VSync(0);
>
>     for(counter = 0; counter < 240; counter++) {           //This part
> doesn't work
>       memcpy( scr+(counter*320), line+(rand()%320), 640 ); //copy 640 bytes
> (320 int's)
>     }
>
>     LoadImage( &screen, *scr );
>
>     DrawSync(0);
>     GsSwapDispBuff();
>   } // end while
>
>   ResetGraph(0);
> } // end main
>
> This is a simple programming question but I do need some help.
>
> Cheers



Not sure exactly what you're trying to do here, but your scr[] array should
probably be u_short, as each screen pixel is 16-bit.  u_long is 32.

Herbs