/*
 * VARCem	Virtual ARchaeological Computer EMulator.
 *		An emulator of (mostly) x86-based PC systems and devices,
 *		using the ISA,EISA,VLB,MCA  and PCI system buses, roughly
 *		spanning the era between 1981 and 1995.
 *
 *		This file is part of the VARCem Project.
 *
 *		Definitions for the CGA driver.
 *
 * Version:	@(#)vid_cga.h	1.0.10	2019/05/17
 *
 * Authors:	Fred N. van Kempen, <decwiz@yahoo.com>
 *		Miran Grca, <mgrca8@gmail.com>
 *		Sarah Walker, <tommowalker@tommowalker.co.uk>
 *
 *		Copyright 2017-2019 Fred N. van Kempen.
 *		Copyright 2016-2018 Miran Grca.
 *		Copyright 2008-2018 Sarah Walker.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free  Software  Foundation; either  version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the:
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place - Suite 330
 *   Boston, MA 02111-1307
 *   USA.
 */
#ifndef VIDEO_CGA_H
# define VIDEO_CGA_H


#define CGA_FONT_ROM_PATH	L"video/ibm/cga/cga.rom"


typedef struct {
    mem_map_t	mapping;

    int		crtcreg;
    uint8_t	crtc[32];

    uint8_t	cgastat;

    uint8_t	cgamode,
		cgacol;

    int		fontbase;
    int		linepos,
		displine;
    int		sc, vc;
    int		cgadispon;
    int		con, coff, cursoron, cgablink;
    int		vsynctime, vadj;
    uint16_t	ma, maback;
    int		oddeven;

    tmrval_t	dispontime,
		dispofftime;
    tmrval_t	vidtime;

    int		firstline,
		lastline;

    int		drawcursor;

    uint8_t	*vram;

    uint8_t	charbuffer[256];

    int		revision;
    int		snow_enabled;
    int		rgb_type;
    int		font_type;

    int		composite;
    priv_t	cpriv;
} cga_t;


#ifdef EMU_DEVICE_H
extern const device_config_t cga_config[];
#endif


extern void    cga_init(cga_t *cga);
extern void    cga_out(uint16_t addr, uint8_t val, priv_t);
extern uint8_t cga_in(uint16_t addr, priv_t);
extern void    cga_write(uint32_t addr, uint8_t val, priv_t);
extern uint8_t cga_read(uint32_t addr, priv_t);
extern void    cga_recalctimings(cga_t *cga);
extern void    cga_poll(priv_t);

extern void    cga_hline(bitmap_t *b, int x1, int y, int x2, uint8_t col);


#endif	/*VIDEO_CGA_H*/
