Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: "Nelson Santos" <nsantos@total.net>
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Sprite widths, why does this work????
Date: 10 Jan 1998 04:41:24 GMT
Organization: SCEA News Server
Lines: 98
Message-ID: <01bd1d9c$4c2d9000$4454eccd@nsantos>
NNTP-Posting-Host: ppp-annex-0258.tor.total.net
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Hi people,

Take a look at this code for me please...

	GsIMAGE  WarningImage;
	GsSPRITE WarningSprite1;
	GsSPRITE WarningSprite2;
	RECT    Dest;

	GsGetTimInfo((u_long *)(TIM_WARNING+4),&WarningImage);

	Dest.x=WarningImage.px;
	Dest.y=WarningImage.py;
	Dest.w=WarningImage.pw;
	Dest.h=WarningImage.ph;
	LoadImage(&Dest,WarningImage.pixel);

	Dest.x=WarningImage.cx;
	Dest.y=WarningImage.cy;
	Dest.w=WarningImage.cw;
	Dest.h=WarningImage.ch;
	LoadImage(&Dest,WarningImage.clut);

	DrawSync(0);

	// Initialize Sprites
	WarningSprite1.attribute = 1 << 26;
	WarningSprite1.x = 0;
	WarningSprite1.y = 80;
	WarningSprite1.w = 256;
	WarningSprite1.h = 80;
	WarningSprite1.tpage = GetTPage(0,0,320,0);
	WarningSprite1.u = 0;
	WarningSprite1.v = 0;
	WarningSprite1.cx = WarningImage.cx;
	WarningSprite1.cy = WarningImage.cy;
	WarningSprite1.r = 127;
	WarningSprite1.g = 127;
	WarningSprite1.b = 127;
	WarningSprite1.mx = 0;
	WarningSprite1.my = 0;
	WarningSprite1.scalex = ONE;
	WarningSprite1.scaley = ONE;
	WarningSprite1.rotate = 0;

	WarningSprite2.attribute = 1 << 26;
	WarningSprite2.x = 256;
	WarningSprite2.y = 80;
	WarningSprite2.w = 64;
	WarningSprite2.h = 80;
	WarningSprite2.tpage = GetTPage(0,0,384,0);
	WarningSprite2.u = 0;
	WarningSprite2.v = 0;
	WarningSprite2.cx = WarningImage.cx;
	WarningSprite2.cy = WarningImage.cy;
	WarningSprite2.r = 127;
	WarningSprite2.g = 127;
	WarningSprite2.b = 127;
	WarningSprite2.mx = 0;
	WarningSprite2.my = 0;
	WarningSprite2.scalex = ONE;
	WarningSprite2.scaley = ONE;
	WarningSprite2.rotate = 0;

	for(; Time != 0 ; Time -= 1)
	{
		Buffer = GsGetActiveBuff();
		GsSetWorkBase((PACKET *)Packet[Buffer]);
		GsClearOt(0,0,&OrdTab[Buffer]);

		GsSortClear(0, 0, 0, &OrdTab[Buffer]);
		GsSortFastSprite(&WarningSprite1,&OrdTab[Buffer], 0);
		GsSortFastSprite(&WarningSprite2,&OrdTab[Buffer], 0);
		
		GsDrawOt(&OrdTab[Buffer]);
		GsSwapDispBuff();
		DrawSync(0);
		VSync(0);
	}



First I load a 320x80 image into the Frame Buffer.  It's a 4-bit image. 
After the GsGetTimInfo, WarningImage.pw is actually equal to 80, not 320! 
This probably has something to do with the fact that the image is a 4-bit
image, but the picture itself is still 320 pixels wide.  Why does it return
80??

Next, I create two sprites, one for the first 256 pixels, and the second
sprite handles the rest of the sprite, 64 pixels.  However, the GetTPage
command for the second sprite must be GetTPage(0,0,384,0) for it to work
properly, rather than GetTPage(0,0,576,0), to skip the 256 pixels in the
first TPage.  I have no idea why this is so.

Can anyone answer these 2 questions for me, please???

Nelson Santos