// Definitions for levels created with PSX level editor
// Coded by Scott Evans 3/6/97
// Last modified 3/6/97

#ifndef _MAP_H
#define _MAP_H

#include <backgrnd.h>
#include <mytypes.h>

// Level bank file header structure

typedef struct
{
	_word nlevels;		// number of levels in bank
	_long offset;		// offset from start of header to 1st parameter block;
}LevelHeader;

// Level parameter block structure

typedef struct
{
	_word nrows;		// size of level in rows and columns
	_word nclms;
	_long offset;		// offset to level data (from start of parameter block)
}LevelPblk;

// Size of above structures

#define LevelHeaderSize	sizeof(MapHeader)
#define LevelPblkSize	sizeof(MapPblk)

// Find number of levels in file

#define _GetNoLevels(h)	(h->nlevels)

// Get address of 1st parametr block

#define _GetLevelPblks(h)	((LevelPblk *)((_byte *)h+h->offset))

// Find address of nth parameter block

#define _GetLevelPblk(h,n)	(_GetLevelPblks(h)+n)

// Find size of level in bytes

#define _GetLevelSize(h,l)	((_GetLevelPblk(h,l))->nrows*(_GetLevelPblk(h,l)->)nclms)

// Find address of level data

#define _GetLevelData(h,l)	(((_byte *)(_GetLevelPblk(h,l))+(_GetLevelPblk(h,l))->offset)

// Copy level map data and set level parameters
// 	lh - address of level file
//	bg - background structure
//	n  - level number to set up
// Returns 1 if OK, 0 for error (out of memory)

_byte LoadLevel(LevelHeader *lh,SpriteBG *bg,_word n)
{
	// Get parameter block for level n
	
	LevelPblk *pblk=_GetLevelPblk(lh,n);
	
	// Calculate size of map in bytes

	_long size=pblk->nrows*pblk->nclms;

	// Get some memory for level data 

	__byte *map=(__byte *)realloc(bg->data,size);

	if(map)
	{
		memcpy(map,(_byte *)pblk+pblk->offset,size);
		bg->data=map;
		
		// Set level map size and initial offset into map
		
		bg->rows=pblk->nrows;
		bg->columns=pblk->nclms;
		bg->yoff=pblk->nrows-bg->h;

		return(1);
	}

	return(0);
}

#endif