/*
    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
*/
#include "SDL_config.h"

/*
	ScreenBlaster 3 functions

	Patrice Mandin
*/

/*--- Includes ---*/

#include "SDL_stdinc.h"
#include "SDL_xbios.h"
#include "SDL_xbios_sb3.h"

/*--- Defines ---*/

const int SDL_XBIOS_scpn_planes_device[] = {
    SCPN_DEV_1BPP,
    SCPN_DEV_4BPP,
    SCPN_DEV_8BPP,
    SCPN_DEV_16BPP,
    SCPN_DEV_2BPP,
    SCPN_DEV_4BPP,
    SCPN_DEV_1BPP
};

/*--- Functions ---*/

int
SDL_XBIOS_SB3Usable(scpn_cookie_t * cookie_scpn)
{
    scpn_screeninfo_t *scrinfo;
    int bpp;

    /* Check if current SB3 mode is usable, i.e. 8 or 16bpp */
    scrinfo = cookie_scpn->screen_info;
    bpp = 1 << (SDL_XBIOS_scpn_planes_device[scrinfo->device]);

    if ((bpp == 8) || (bpp == 16)) {
        return 1;
    }

    return 0;
}

void
SDL_XBIOS_SB3Init(_THIS, scpn_cookie_t * cookie_scpn)
{
    scpn_screeninfo_t *scrinfo;

    /* SB3 prevent changing video modes, we can only use current one */
    if (XBIOS_modelist) {
        SDL_free(XBIOS_modelist);
        XBIOS_nummodes = 0;
        XBIOS_modelist = NULL;
    }

    scrinfo = cookie_scpn->screen_info;
    scrinfo->h_pos = scrinfo->v_pos = 0;

    SDL_XBIOS_AddMode(this,
                      -1,
                      scrinfo->virtual_width, scrinfo->virtual_height,
                      1 << (SDL_XBIOS_scpn_planes_device[scrinfo->device]),
                      SDL_FALSE);
}

/* vi: set ts=4 sw=4 expandtab: */