Path: chuka.playstation.co.uk!news
From: "David \"DM\" Treay" <dmtreay@hunterlink.net.au>
Newsgroups: scee.yaroze.programming.2d_graphics
Subject: Having trouble with 2D sprite viewer
Date: Sun, 28 Dec 1997 20:43:17 +1000
Organization: SF Productions
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Message-ID: <34A62D45.501@hunterlink.net.au>
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I've been trying to make a program to display 2D images as sprites
(taking judicious inspiration from Ira Rainey's SPRITE.C tutorial). The
problem is, when I GCC-compile it and then download it with PSComUtil, I
get a few blue bricks roughly the size of the image instead of the image
loaded in from the TIM file. I have only had the Yaroze for four days,
and consider myself quite lucky to have already written a basic B&W
image display - now I need colour, which is what this program is
supposed to be. BTW, the reason I use GCC to compile and PSComUtil for
downloads is a) I can't get SIOCONS to work, and b) I haven't had time
to learn how to use CodeWarrior. So, can somebody please solve the
riddle of the blue bricks?

Here's the code.

#include <libps.h>

#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 240

#define NO_SPRITES (1 + 1)

#define OT_LENGTH       1

#define		spriteAdd	0x80100000

GsOT		WorldOT[2];
GsOT_TAG	OTTags[2][1<<OT_LENGTH];

PACKET GpuPacketArea[2][NO_SPRITES*sizeof(GsSPRITE)];

GsSPRITE SpriteInfo;
int Buffer;

long userWantsQuit = 0;

/* Function declaration */

void main ();
void InitialiseGraphic ();

/* MAIN */

void main ()
{
        int i;

        GsInitGraph(SCREEN_WIDTH,SCREEN_HEIGHT,4,1,0);
        GsDefDispBuff(0,0,0,SCREEN_HEIGHT);

        /* Set up the ordering table */

        for (i = 0; i < 2; i++)

        {
                WorldOT[i].length = OT_LENGTH;
                WorldOT[i].org = OTTags[i];
        }

        /* Draw up the TIM file */

        InitialiseGraphic ();

        while (!userWantsQuit)

        {
                Buffer = GsGetActiveBuff();
                GsSetWorkBase((PACKET*)GpuPacketArea[Buffer]);
                GsClearOt(0,0,&WorldOT[Buffer]);

                GsSortFastSprite(&SpriteInfo,&WorldOT[Buffer],0);

                DrawSync(0);

                VSync(0);
                GsSwapDispBuff();
                GsSortClear(0,0,0,&WorldOT[Buffer]);
                GsDrawOt(&WorldOT[Buffer]);

        }
}

/* INITIALISE GRAPHIC */

void InitialiseGraphic ()
{
        RECT rect;
        GsIMAGE ImageSetup;

        GsGetTimInfo ((u_long *)(spriteAdd+4),&ImageSetup);

        rect.x = ImageSetup.px;
        rect.y = ImageSetup.py;
        rect.w = ImageSetup.pw;
        rect.h = ImageSetup.ph;

        LoadImage (&rect, ImageSetup.pixel);

        /* Load up the CLUT table */
 
        rect.x = ImageSetup.cx;
        rect.y = ImageSetup.cy;
        rect.w = ImageSetup.cw;
        rect.h = ImageSetup.ch;
        
        LoadImage (&rect, ImageSetup.clut);
        
        /* Set up TIM data as a sprite */

        SpriteInfo.attribute = 0x01000000;
        SpriteInfo.x = ((SCREEN_WIDTH/2)-(ImageSetup.pw));
        SpriteInfo.y = ((SCREEN_HEIGHT/2)-(ImageSetup.ph/2));
        SpriteInfo.w = (ImageSetup.pw*2);
        SpriteInfo.h = ImageSetup.ph;
        SpriteInfo.tpage = GetTPage(1, 0, ImageSetup.px, ImageSetup.py);
        SpriteInfo.u = 0;
        SpriteInfo.v = 0;
        SpriteInfo.cx = ImageSetup.cx;
        SpriteInfo.cy = ImageSetup.cy;
        SpriteInfo.r = 128;
        SpriteInfo.g = 128,
        SpriteInfo.b = 128;
        SpriteInfo.mx = 0;
        SpriteInfo.my = 0;
        SpriteInfo.scalex = ONE;
        SpriteInfo.scaley = ONE;
        SpriteInfo.rotate = 0;

        DrawSync(0);

}

It loads with an AUTO.BAT:

local dload test_spr.tim 80100000
local dload MAIN // executable 
go

-- 
       David "DM" Treay (dmtreay@hunterlink.net.au)
SF PRODUCTIONS - Newcastle's only PlayStation developers!

  "Tell me sir... have you confused your cat recently?"