Path: chuka.playstation.co.uk!news
From: "Ben James" <hungryghost@clara.co.uk>
Newsgroups: scee.yaroze.freetalk.english
Subject: Re: Buggery Title Screen!!
Date: Wed, 29 Aug 2001 20:25:15 +0100
Organization: PlayStation Net Yaroze (SCEE)
Lines: 120
Message-ID: <9mjfqr$dra4@www.netyaroze-europe.com>
References: <9mgsl9$8t81@www.netyaroze-europe.com>
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Could the CLUT be positioned somewhere in the frame buffer? That could make
all the sprites appear black.

Something I always do during development is clear the screen to mid-grey at
the start of a frame. Quite often when something's not quite working it get
drawn as black and therefore invisible on a black background.

Ben

"Max" <mad.max@which.net> wrote in message
news:9mgsl9$8t81@www.netyaroze-europe.com...
Hey all,

Now I'm trying to get the title screen in MonkyRegs, and I thought I had it
sussed until the Yaroze told me otherwise. I can't honestly see where its
going wrong.

I have 640 x 512 res and I'm trying to get 4 230 x 222 x 8-bit images on the
screen arranged into a (imperfect) square. The code I use for loading and
setting up the sprite is below, can someone have a look and tell me whats
wrong if anything, I'm in the process of narrowing down the causes. Does
anyone else use the gnu debugger? - if so do they have as much damn trouble
getting the thing to run as I do? - I have given up on it completely.

This code is executed before I go into the game loop, the mode is first 2D
to allow the menu to be put up, then when the game starts I switch to 3D. (I
will probably will have the title screen overlayed on the 3D arena
eventually but just now I want to get this working so that if I come to
adding anything before the title screen I will know how to. Thanks all.

/*-------------------------------------CODE-------------------------------*/

void InitSprite(u_long *addr, GsSPRITE *sprite, short xPos, short yPos)
{
 RECT rect; // this is a rectangle in which the sprite will be stored

 GsIMAGE imageInfo; // this holds the actual sprite data

 GsGetTimInfo((u_long *)(addr+4),&imageInfo); // read the TIM and store its
data in imageInfo

 // set up the rect before we load in the data
 setRect(&rect,imageInfo.px,imageInfo.py,imageInfo.pw,imageInfo.ph); // set
up the rect for texture loading to VRAM

 LoadImage(&rect, imageInfo.pixel); // load in the data to the rect

 DrawSync(0);

 // check to see if the image has a clut i.e. < 16 bit
 if((imageInfo.pmode>>3)&0x01)
 {
  // CLUT exists so load it into the rect
  setRect(&rect,imageInfo.cx,imageInfo.cy,imageInfo.cw,imageInfo.ch); // set
up the rect for texture loading to VRAM
  LoadImage(&rect, imageInfo.clut); // Loads all of the above into the Frame
Buffer

  DrawSync(0);
 }

 sprite->x = xPos; // set up the position within the frame
 sprite->y = yPos;

 // check for bit mode
 if(0)
 switch(imageInfo.pmode)
 {
  case 0x08 /*4 bit*/ : sprite->attribute = 0 << 24; // this tells the
yaroze what attributes the image has
        sprite->w = imageInfo.pw*4;  // this is the image data offset in the
VRAM
        sprite->tpage = GetTPage(0,0,imageInfo.px,imageInfo.py); // gets
texture page address
        break;

  case 0x09 /*8 bit*/ : sprite->attribute = 1 << 24;
        sprite->w = imageInfo.pw*2;
        sprite->tpage = GetTPage(1,0,imageInfo.px,imageInfo.py);
        break;

  default  /*16 bit*/ : sprite->attribute = 1 << 25;
        sprite->w = imageInfo.pw;
        sprite->tpage = GetTPage(2,0,imageInfo.px,imageInfo.py);
        break;
 }

 sprite->h = imageInfo.ph;  // sets the height of the sprite

 sprite->u = 0;     // sets the texture page offset of the sprite along the
x axis
 sprite->v = 0;     // sets the texture page offset of the sprite along the
y axis

 sprite->cx = imageInfo.cx;  // sets the x position of the CLUT, if any
 sprite->cy = imageInfo.cy;

 sprite->r = 128;     // used to apply brightness to the sprite, 128 is
normal
 sprite->g = 128;
 sprite->b = 128;

 sprite->mx = sprite->w/2;   // sets the center point of the sprite for use
with rotation etc
 sprite->my = sprite->h/2;

 sprite->scalex = 4096;   // sets sprite scaling to default, x axis
 sprite->scaley = 4096;   // sets sprite scaling to default, y axis

 sprite->rotate = 0;    // sets rotation to off
}

/*-------------------------------------------CODE---------------------------
-----*/

Max