Path: chuka.playstation.co.uk!news
From: Chris Chadwick <xjk18@dial.pipex.com>
Newsgroups: scee.yaroze.beginners
Subject: Re: Ok, truly stuck again.
Date: Mon, 11 Aug 1997 01:08:57 -0700
Organization: PlayStation Net Yaroze (SCEE)
Lines: 151
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Mark Green wrote:
> 
> I'm actually going to post my source here because I really can't see
> what's wrong (and worse yet I have to post through Netscape to do a file
> include, so it'll probably do that stupid post-it-in-html-twice trick,
> but I can't get a decent bit of news software and my telnet won't
> transmit files.. many apologies in advance if it has done it).
>   Basically, this program is supposed to draw a sprite, but it doesn't
> work at all.  And I can't see why.  I have checked against the check
> program and against shadow's code and it seems to do everything in the
> same order.  If I take the GsSortClear() out, it works, but doesn't
> clear the screen (of course ;) )
>   Any help much appreciated.
> 
> Mg

Hi Mark,

I've had a quick look through your code and the only problem I can
see is regarding the OT length. I've annoted your code, below,
to what I think should help...

Sorry I couldn't actually try this out but it's too late/early now
do so (for reasons I wont bore you with). Anyway, if this makes no
difference, or I've missed something else, Im shaw a SCEE tech bod
will step in tomorrow (Monday) and help you out!

This is me signing off for at least a few days while my laptop
goes on a jolly jaunt back to Ireland for repairs :(

See ya later

Chris

> 
>     ---------------------------------------------------------------
> 
> #include <libps.h>
> #include "pad.h"
> 
> #define VH_ADDR         0x80100000  #define OT_LENGTH	  1		//can be any value from 1 to 14 only!		<-- add this line
					//1 here = just 2 Z planes (see below)
> 
> /* Reserved memory for building packets for the GPU */
> PACKET Packets[2][500];
> 
> /* Ordering table for planes */
> GsOT OT[2];
> /* Only need a few tags, since we're not using 3D */
> GsOT_TAG Tag[2][1<<OT_LENGTH];	//1<<OT_LENGTH=2 planes				<-- change to this line					//Note the 2nd dimension, 10 you had in your
					//original code is invalid: it must be a power of 2
> int frame;
> 
> /* Our sprite record */
> GsSPRITE oursprite;
> 
> /* Where we put the TIM */
> u_long *theTIMfile = (u_long *)VH_ADDR;
> 
> /* Pointers to the PSX control buffers */
> volatile u_char *bb0, *bb1;
> 
> GsIMAGE         theimage;
> 
> /* God knows what this does, but it works */
> static u_long PadRead(long id)
> {
>         return(~(*(bb0+3) | *(bb0+2) << 8 | *(bb1+3) << 16 | *(bb1+2) << 24));
> }
> 
> void loadthetexture() {
>         RECT            rect;
>         int             i;
> 
>         GsGetTimInfo((u_long *)(VH_ADDR+4),&theimage);
>         rect.x = theimage.px;  rect.y = theimage.py;
>         rect.w = theimage.pw;  rect.h = theimage.ph;
>         LoadImage(&rect, theimage.pixel);
>         rect.x = theimage.cx;     rect.y = theimage.cy;
>         rect.w = theimage.cw;     rect.h = theimage.ch;
>         LoadImage(&rect, theimage.clut);
>         DrawSync(0);
> }
> 
> void setupsprite() {
>   u_long tpage;
> 
>   tpage = GetTPage(1,0,640,0);
> 
>   oursprite.attribute = 1 << 24;
>   oursprite.x = 50; oursprite.y = 50;
>   oursprite.w = theimage.pw*2; oursprite.h = theimage.ph;
>   oursprite.u = 0; oursprite.v = 0;
>   oursprite.cx = theimage.cx; oursprite.cy = theimage.cy;
>   oursprite.tpage = tpage;
>   oursprite.r = oursprite.g = oursprite.b = 128;
>   oursprite.scalex = oursprite.scaley = ONE;
>   oursprite.mx = oursprite.my = 10;
>   oursprite.rotate = 0;
> }
> 
> main() {
> 
>   int t;
>   u_long padval;
>   /* Set up screen */
> 
>   SetVideoMode(MODE_PAL);
>   GetPadBuf(&bb0, &bb1);
>   GsInitGraph(320,256,4,0,0);
> 
>   /* Tell system where the double-buffer screen is in the global fbuf */
>   GsDefDispBuff(0,0,0,256);
> 
>   /* Set up the ordering tables */
>   for (t=0; t<2; t++) {
>     OT[t].length = OT_LENGTH;							<-- change to this line
>     OT[t].org = Tag[t];
>   }
> 
>   loadthetexture();
>   setupsprite();
> 
> /* ORDER OF DOING THINGS: */
> /*    Compute frame X */
> /*    Check drawing of frame X-1 is finished */
> /*    Wait for vertical blanking */
> /*    Shift X-1 into screen, bring X-2 to buffer for overwrite */
> /*    Start drawing frame X */
> /*    Increment X, go to top */
> 
>   while (padval != PADselect) {
> 
>     frame = GsGetActiveBuff();
>     GsSetWorkBase((PACKET *)Packets[frame]);
>     GsClearOt(0,0,&OT[frame]);
> 
>     padval = PadRead(1);
>     if (padval & PADLright) oursprite.rotate += 4096;
>     if (padval & PADLleft) oursprite.rotate -= 4096;
> 
>     GsSortSprite(&oursprite, &OT[frame], 0);
> 
>     DrawSync(0);
>     VSync(0);
>     GsSwapDispBuff();
>     GsSortClear(0,0,0,&OT[frame]);
>     GsDrawOt(&OT[frame]);
>   }
> 
> }