/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

/*
	Blowup extension definitions

	Patrice Mandin
*/

#include "SDL_xbios.h"
#include "SDL_xbios_blowup.h"

void SDL_XBIOS_BlowupInit(_THIS, blow_cookie_t *cookie_blow)
{
	int i, num_mode, bank, keep_old;
	xbiosmode_t *current_mode;
	blow_mode_t *blow_mode;

	current_mode = XBIOS_modelist;
	for (i=0;i<XBIOS_nummodes;i++) {
		keep_old=1;	/* use default mode */
		blow_mode = NULL;
		switch (current_mode->depth) {
			case 1:
				num_mode=0;
				break;
			case 2:
				num_mode=1;
				break;
			case 4:
				num_mode=2;
				break;
			case 8:
				num_mode=3;
				break;
			case 16:
				num_mode=4;
				break;
			default:
				num_mode=-1;
				break;
		}

		/* Check which bank of modes to use */
		if (num_mode>=0) {
			bank = cookie_blow->num_mode[num_mode];
			blow_mode = &(cookie_blow->blowup_modes[num_mode+(bank*5)]);
	
			/* Check extended mode enabled */
			if (blow_mode->enabled == 0) {
				/* Check monitor needed for this mode */
				if ((blow_mode->monitor == cookie_blow->montype)
					|| ((blow_mode->monitor == MONITOR_TV)
						&& (cookie_blow->montype == MONITOR_RGB))
					|| ((blow_mode->monitor == MONITOR_RGB)
						&& (cookie_blow->montype == MONITOR_TV)))
				{
					keep_old = 0; /* we can use this extended mode */
				}
			}
		}

		if (keep_old) {
			/* disable blowup for this mode */
			current_mode->number |= (1<<15);	
		} else {
			/* Update mode size */
			current_mode->width = blow_mode->width +1;
			current_mode->height = blow_mode->height +1;
		}

		current_mode++;
	}
}