Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: Kevin <khauck@leland.stanford.edu>
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: multiple sprites -- problem, need help
Date: Sat, 26 Jul 1997 09:58:14 -0700
Organization: intuit-10006594!qfn@concentric.net
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Message-ID: <33DA2CA6.4A7F@leland.stanford.edu>
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I can't seem to get multiple sprites to display.  With the code
below, all the sprites come out looking like ship2.img.  Am I
missing something in the definition?  It isn't well-written,
but I am just trying to get something working so I can make
some basic functions I can use all the time.

--- BEGIN ---

#include <libps.h>
#include "ship2.img"
#include "ship3.img"
#include "ship4.img"
#include "ship5.img"

...

#define PACKET_CNT 200

...

PACKET GpuPacketArea[2][PACKET_CNT*24];
GsOT world_OT[2];
GsOT_TAG OT_tag[2][1 << 1];
GsSPRITE sprtShip[4];
GsSPRITE *sprtDrawShip;
int active_buff;
GsLINE line_outer1, line_outer2, line_outer3, line_outer4;

#include "sonyintr.c"

main () {
  RECT rect;
  int i, j = 0, k = 0;
  int negate_control = 0;
  int ship_x = 100, ship_y = 100;

  SetVideoMode (MODE_NTSC);
  GsInitGraph (320, 240, 4, 0, 0);
  GsDefDispBuff (0, 0, 0, 240);

  world_OT[0].length = 1;
  world_OT[0].org = OT_tag[0];
  world_OT[1].length = 1;
  world_OT[1].org = OT_tag[1];

  rect.x = IMG_SHIP2_X;
  rect.y = IMG_SHIP2_Y;
  rect.w = IMG_SHIP2_WW;
  rect.h = IMG_SHIP2_H;
  LoadImage(&rect, imgShip2);

  rect.x = IMG_SHIP3_X;
  rect.y = IMG_SHIP3_Y;
  rect.w = IMG_SHIP3_WW;
  rect.h = IMG_SHIP3_H;
  LoadImage(&rect, imgShip3);

  rect.x = IMG_SHIP4_X;
  rect.y = IMG_SHIP4_Y;
  rect.w = IMG_SHIP4_WW;
  rect.h = IMG_SHIP4_H;
  LoadImage(&rect, imgShip4);

  rect.x = IMG_SHIP5_X;
  rect.y = IMG_SHIP5_Y;
  rect.w = IMG_SHIP5_WW;
  rect.h = IMG_SHIP5_H;
  LoadImage(&rect, imgShip5);

  sprtShip[0].tpage = GetTPage(2, 0, IMG_SHIP2_X, IMG_SHIP2_Y);
  sprtShip[1].tpage = GetTPage(2, 0, IMG_SHIP3_X, IMG_SHIP3_Y);
  sprtShip[2].tpage = GetTPage(2, 0, IMG_SHIP4_X, IMG_SHIP4_Y);
  sprtShip[3].tpage = GetTPage(2, 0, IMG_SHIP5_X, IMG_SHIP5_Y);
  sprtShip[0].attribute = IMG_SHIP2_ATTR;
  sprtShip[1].attribute = IMG_SHIP3_ATTR;
  sprtShip[2].attribute = IMG_SHIP4_ATTR;
  sprtShip[3].attribute = IMG_SHIP5_ATTR;

  for (i = 0; i < 4; i++) {
    sprtShip[i].x = 100;
    sprtShip[i].y = 100;
    sprtShip[i].w = 9;
    sprtShip[i].h = 9;
    sprtShip[i].u = 0;
    sprtShip[i].v = 0;
    sprtShip[i].r = 128;
    sprtShip[i].g = 128;
    sprtShip[i].b = 128;
    sprtShip[i].mx = 5;
    sprtShip[i].my = 5;
    sprtShip[i].scalex = ONE;
    sprtShip[i].scaley = ONE;
    sprtShip[i].rotate = 0;
  }
  sprtDrawShip = &sprtShip[1];

...

  {
    u_long old_state;
    u_long cont_state;
    GsBOXF box1, box2;

    GetPadBuf (&bb0, &bb1);

    while (1) {
      cont_state = PadRead(1);
      if (cont_state & PAD_SELECT)
        break;

      if (negate_control > 0)
        negate_control--;
      else {
        if (cont_state & PAD_LEFT) {
          if (ship_x > 10)
            ship_x -= GAME_SHIP_STEP;
          negate_control = GAME_CONTROL_DELAY;
          sprtDrawShip = &sprtShip[0];

        } else if (cont_state & PAD_RIGHT) {
          if (ship_x < 300)
            ship_x += GAME_SHIP_STEP;
          negate_control = GAME_CONTROL_DELAY;
          sprtDrawShip = &sprtShip[1];

        } else if (cont_state & PAD_UP) {
          if (ship_y > 10)
            ship_y -= GAME_SHIP_STEP;
          negate_control = GAME_CONTROL_DELAY;
          sprtDrawShip = &sprtShip[2];

        } else if (cont_state & PAD_DOWN) {
          if (ship_y < 220)
            ship_y += GAME_SHIP_STEP;
          negate_control = GAME_CONTROL_DELAY;
          sprtDrawShip = &sprtShip[3];
        }
      }
      // init graphics, get ready to draw
      active_buff = GsGetActiveBuff();
      GsSetWorkBase((PACKET *)GpuPacketArea[active_buff]);
      GsClearOt(0, 0, &world_OT[active_buff]); // optional

      // drawing code goes here
      GsSortLine (&line_outer1, &world_OT[active_buff], 1);
      GsSortLine (&line_outer2, &world_OT[active_buff], 1);
      GsSortLine (&line_outer3, &world_OT[active_buff], 1);
      GsSortLine (&line_outer4, &world_OT[active_buff], 1);

      sprtShip[0].x = 100;
      sprtShip[0].y = 20;
      sprtShip[1].x = 120;
      sprtShip[1].y = 20;
      sprtShip[2].x = 140;
      sprtShip[2].y = 20;
      sprtShip[3].x = 160;
      sprtShip[3].y = 20;

      GsSortFastSprite (&sprtShip[0], &world_OT[active_buff], 1);
      GsSortFastSprite (&sprtShip[1], &world_OT[active_buff], 1);
      GsSortFastSprite (&sprtShip[2], &world_OT[active_buff], 1);
      GsSortFastSprite (&sprtShip[3], &world_OT[active_buff], 1);

      sprtDrawShip->x = ship_x;
      sprtDrawShip->y = ship_y;
      GsSortFastSprite(sprtDrawShip, &world_OT[active_buff], 1);
      
      // finish drawing
      DrawSync(0);
      GsSwapDispBuff();
      GsSortClear(0, 0, 0, &world_OT[active_buff]);
      GsDrawOt(&world_OT[active_buff]);
    } /* while */
  }

  return (0);
}

--- END ---

sprtShip[0, 1, 2, 3] is supposed to show up depending on which
direction the ship is heading.  But only sprtShip[0] shows up,
no matter which direction the control is pressed.  Also the four
ships at the top center of the screen all look the same, when they
should be different.  I checked the .img files to make sure they
are different and they are, and they defined as

SHIP2 (x, y):  320, 0
SHIP3 (x, y):  330, 0
SHIP4 (x, y):  340, 0
SHIP5 (x, y):  350, 0

in the .img file.  

Please help if you can, thanks-
---
Dan