Path: chuka.playstation.co.uk!news
From: yaroze@theburrow.co.uk (Barry & Robert Swan)
Newsgroups: scee.yaroze.beginners
Subject: Re: map-tastic tile question
Date: Sun, 20 Jun 1999 01:33:30 GMT
Organization: PlayStation Net Yaroze (SCEE)
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unfortunaltey, seeing as Im half drunk, not sure how much of this has
been covered in previous posts.

point 1)

Ive noticed the compiled version of a for(i=0; i<100; i++) with
optimisation does get compiled as for(i=99; i>=0; i--) presumably
meaning that i-- is faster than i++ but as its handled by compiler,
you should be able to pretty much ignore it !

ok, back to clipping a world. how about sometyhing like this?
(again off the top of my head... apologies for mistakes)


#define 	CELLS_X	(50)
#define	CELLS_Y	(50)
#define	CELLS_ONSCREEN_X	(10)
#define	CELLS_ONSCREEN_Y	(10)

CellType	WorldArray[CELLS_X][CELLS_Y];

//	 in loop for clipping
//	 x and y are basically the array index of the first visible 
//	 cell in the top left of the screen.
void BlahBlahClipWorld(int x, int y)
{
	CellType	*cell;
	int i,j;

	cell = &WorldArray[x][y];
	for (i=0; i<(CELLS_ONSCREEN_X; i++)
	{
		for (j=0; j<CELL_ONSCREEN_Y; j++)
		{
			GsSortSprite(cell->spriteAddress,
&otRubbishInfo, depth);
			cell++;
			
		}
		cell += CELLS_X-CELLS_ONSCREEN_X-1;
	}	

aargh, cant think straight... maybe got loads of my x and ys in the
wrong order, but there you go. It does work, and its all pointer
arithmetic. which is nice.

it doesnt take into account clipping when you get to the edge of the
world but hey, my brain hurts :)

Rob