/*
 * scr_gfx.mda:
 *	IBM PC screen handling, monochrome display
 *
 * Copyright (c) 1989 University of Toronto. All rights reserved.
 * Anyone may use or copy this software, except that it may not be
 * sold for profit, that this copyright notice remain intact, and that
 * credit is given where it is due. The University of Toronto and the
 * author make no warranty and accept no liability for this software.
 */

static char GFXid[] = "$Header: scr_gfx.mda,v 1.1 89/04/13 16:12:13 pkern Exp $";

/* video mode parameters */
unsigned int txt_mode=0x07, txt_addr=0xb000;
unsigned int avm_mode=0, avm_addr=0;

unsigned int gfx_mode=0, gfx_addr=0;
unsigned int gfx_xres=2, gfx_yres=2, gfx_numclr=1;


/*
 * Monochrome display graphics nitty-gritty:
 *	basically nothing done here, mostly dummy routines
 */

init_gfx()
{
	extern uchar interlace, gcolour;
	extern int gmax_x, gmax_y, gmax_clr;

	gmax_x = gfx_xres = 2;
	gmax_y = gfx_yres = 2;
	gmax_clr = gfx_numclr = 1;
	gcolour = gmax_clr-1;
}

/* gfx_erase -- clear or hide the graphics screen */
gfx_erase()
{
	/* nothing needed */
}

gfx_colour(n)
uchar n;
{
	return(1);
}

/* gpeek -- get a pixel's colour */
gpeek(x, y)
int x, y;
{
	return(1);
}

/* boink -- light a pixel */
boink(x,y,c)
int x, y;
uchar c;
{
	/* zilch */
}

/*
 * hline -- only does horizontal lines (union regulations :-)
 * (called from bline(), should be optimized for speed).
 */
hline(x,y,n,c)
int x;
register int y,n;
uchar c;
{
	/* zilch */
}

/*
 * vline -- vertical lines only
 * (again, called from bline(), should be optimized for speed).
 */
vline(x,y,n,c)
int y;
register int x,n;
uchar c;
{
	/* zilch */
}

/*
 * xrun -- optimize search for runs to colour c in x direction
 * (called from dofill(), should be quicker that gpeek()-ing each pixel)
 */
xrun(x, y, c, dir)
int x, y, dir;
uchar c;
{
	return(x);
}