Path: chuka.playstation.co.uk!news
From: "Richard Maddocks" <mads@civy.demon.co.uk>
Newsgroups: scee.yaroze.programming.2d_graphics
Subject: Re: Background Images
Date: 22 Mar 1997 02:43:13 GMT
Organization: The World's Fair Ltd
Lines: 93
Message-ID: <01bc366a$dde16220$5b18989e@civy>
References: <3332DF3B.14F5@innotts.co.uk>
NNTP-Posting-Host: civy.demon.co.uk
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Richard Haskey <rhaskey@innotts.co.uk> wrote in article
<3332DF3B.14F5@innotts.co.uk>...
> Hi,
> 
> 
> 
> 	Does anyone know where I can get source for displaying a 
> 
> 	background image (GsBG definition)?
> 
> 
> 
> 	I have tried all day to display a repeated texture cell 
> 
> 	but have been so far been unsuccessful.
> 
> 
> 
> 	Also, is it possible to rotate the background image using
> 
> 	hardware - There is a rotate field within the GsBG structure
> 
> 	but the comments describing the function GsSortFixBg16 
> 
>         (which I am trying to use to display the image) say :-
> 
>         "BG rotation/scaling/reduction not possible"

Just had a look at it as well I've sort of got it to work ish.

It's all hardwired and only uses one cell but here goes.

Hope it helps

Richard

unsigned long m_work[(((320/16+1)*(240/16 +1+1)*6+4)*2+2)];
GsCELL	m_cell[2];
unsigned short m_index[400];
GsMAP	m_map;
GsBG	m_bg;


//Put before main game loop
	MWbload("tile.tim",(void *)TIM_ADDRESS);	//CodeWarrior Only I think
	LoadTimFile (TIM_ADDRESS);			//Get from TimView in demo area
	initBG(TIM_ADDRESS);
	GsInitFixBg16( &m_bg,&m_work[0] );

//Put in main game loop
	GsSortFixBg16(&m_bg,m_work,&WorldOT[activeBuffer], 0);


void initBG(u_long mainMemoryAddress)
{
	GsIMAGE	timImage;		// structure holding info on TIM file
	int i;
	GsGetTimInfo( (u_long *)(mainMemoryAddress+4), &timImage);
	m_cell[0].u=(timImage.px % 64)*2;	//For 8 bit clut
	m_cell[0].v=timImage.py % 256;
	m_cell[0].cba=(timImage.cx/16) | (timImage.cy << 6);
	m_cell[0].flag=0;
	m_cell[0].tpage=GetTPage(1, 0, timImage.px, timImage.py);
	for (i=0;i<400;i++)
	{
		m_index[i]=0;
	}
	m_map.cellw=16;//timImage.pw *2;
	m_map.cellh=16;//timImage.ph;
	m_map.ncellw=20;
	m_map.ncellh=20;
	m_map.base=&m_cell[0];
	m_map.index = &m_index[0];

	m_bg.x=0;
	m_bg.y=0;
	m_bg.w=320;		//N/A:(
	m_bg.h=240;		//N/A:(	
	m_bg.scrollx=0;
	m_bg.scrolly=0;
	m_bg.r=m_bg.g=m_bg.b=128;
	m_bg.map=&m_map;
	m_bg.mx=0;		//N/A :(
	m_bg.my=0;		//N/A :(
	m_bg.scalex=4096*2;	//N/A  :(
	m_bg.scaley=4096*2;	//N/A  :(
	m_bg.rotate=0;		//N/A :(
	m_bg.attribute=0x41000000;
}