Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: "Mark Cooke" <spider@best.com>
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Sprite Help. Warning lots of code
Date: 2 Jun 1997 23:59:09 GMT
Organization: SCEA Net Yaroze News
Lines: 107
Message-ID: <01bc6fb1$8104ef10$7b7b7bcc@bank>
NNTP-Posting-Host: spider.vip.best.com
X-Newsreader: Microsoft Internet News 4.70.1155

Hi, I was having some troubles with getting a sprite up on the screen. I
can get some weird stuff to happen, but nothing like what I would expect. I
suspect that somewhere in the following code my numbers are wrong. Anyone
care to give me a hand?

// 2D Display Playstation Sprite

#include <libps.h>
#include "pad.h"

GsOT WorldOT[2]; // How Many sprites in world & where draw
GsOT_TAG OTtag[2][1<<1];
int activeBuffer; // Which buffer are we drawing to?

#define SPRITE_CNT 7 
PACKET GpuPacketArea[2][1*sizeof(GsSPRITE)];

#define OUR_SPRITE_ADDRESS 0x80090000
GsSPRITE ourSprite; // Guess what this is?
GsIMAGE  ourSpriteInfo;

void main()
{
  int i;
  int padData;
  RECT rect;
  u_short texturePage;
  int hsync = 0;

  SetVideoMode( MODE_NTSC ); // For American TV's

  ResetGraph(0);

  GsInitGraph(320, 240, 4, 0, 0); // 320x240, GPU Doublebuffer, No dither
                                  // 16-bit color
  GsDefDispBuff(0, 0, 0, 240);    // Front Buffer starts at 0,0
                                  // Back  Buffer starts at 0,240 
  // Initialize the ordering table  

  PadInit();
  
  for (i = 0; i < 2; i++)
  {
    WorldOT[i].length = 1;
    WorldOT[i].org = OTtag[i];
  }

  ourSprite.r = 128;
  ourSprite.g = 128;
  ourSprite.b = 128;
  ourSprite.scalex = ONE;
  ourSprite.scaley = ONE;
  ourSprite.rotate = 0;

  ourSprite.tpage = GetTPage(1, 0, 320, 0);
  ourSprite.attribute |= 1 << 25; 
  ourSprite.x = 0;
  ourSprite.y = 0;
  ourSprite.w = 128;
  ourSprite.h = 240;
  ourSprite.u = 0;
  ourSprite.v = 0;

  setRECT( &rect, 960, 0, 128, 240 );

  GsGetTimInfo( (u_long *)(OUR_SPRITE_ADDRESS+4), &ourSpriteInfo);

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

  LoadImage(&rect, ourSpriteInfo.pixel);

  if ((ourSpriteInfo.pmode >> 3) & 0x01)
  {
    rect.x = ourSpriteInfo.cx;
    rect.y = ourSpriteInfo.cy;
    rect.w = ourSpriteInfo.cw;
    rect.h = ourSpriteInfo.ch;

    LoadImage( &rect, ourSpriteInfo.clut);
  }

  DrawSync(0);

  activeBuffer = GsGetActiveBuff();

  while (1)
  {
    padData = PadRead(); 
    if (padData & PADselect)
      break;
    GsSetWorkBase((PACKET *)GpuPacketArea[activeBuffer]);
    GsClearOt(0,0,&WorldOT[activeBuffer]);
    GsSortSprite(&ourSprite, &WorldOT[activeBuffer], 3);
    hsync = VSync(0);
    ResetGraph(1);
    GsSwapDispBuff();
    GsSortClear(0,0,4,&WorldOT[activeBuffer]);
    //GsDrawOt(&WorldOT[activeBuffer]);
    activeBuffer ^= 1;
  }
  ResetGraph(3);
 }

Mark Cooke