86Box/src/video/vid_ega.h

/*
 * 86Box	A hypervisor and IBM PC system emulator that specializes in
 *		running old operating systems and software designed for IBM
 *		PC systems and compatibles from 1981 through fairly recent
 *		system designs based on the PCI bus.
 *
 *		This file is part of the 86Box distribution.
 *
 *		Emulation of the EGA, Chips & Technologies SuperEGA, and
 *		AX JEGA graphics cards.
 *
 * Version:	@(#)vid_ega.h	1.0.1	2017/06/05
 *
 * Author:	Sarah Walker, <http://pcem-emulator.co.uk/>
 *		Miran Grca, <mgrca8@gmail.com>
 *		akm,
 *		Copyright 2008-2017 Sarah Walker.
 *		Copyright 2016-2017 Miran Grca.
 *		Copyright 2017-2017 akm.
 */

#include <stdint.h>

typedef struct ega_t
{
        mem_mapping_t mapping;
        
        rom_t bios_rom;
        
        uint8_t crtcreg;
        uint8_t crtc[32];
        uint8_t gdcreg[16];
        int gdcaddr;
        uint8_t attrregs[32];
        int attraddr, attrff;
	int attr_palette_enable;
        uint8_t seqregs[64];
        int seqaddr;
        
        uint8_t miscout;
        int vidclock;

        uint8_t la, lb, lc, ld;
        
        uint8_t stat;
        
        int fast;
        uint8_t colourcompare, colournocare;
        int readmode, writemode, readplane;
        int chain4, chain2_read, chain2_write;
	int oddeven_page, oddeven_chain;
	int enablevram, extvram;
        uint8_t writemask;
        uint32_t charseta, charsetb;
        
        uint8_t egapal[16];
        uint32_t *pallook;

        int vtotal, dispend, vsyncstart, split, vblankstart;
        int hdisp,  htotal,  hdisp_time, rowoffset;
        int lowres, interlace;
        int linedbl, rowcount;
        double clock;
        uint32_t ma_latch;
        
        int vres;
        
        int64_t dispontime, dispofftime;
        int64_t vidtime;
        
        uint8_t scrblank;
        
        int dispon;
        int hdisp_on;

        uint32_t ma, maback, ca;
        int vc;
        int sc;
        int linepos, vslines, linecountff, oddeven;
        int con, cursoron, blink;
        int scrollcache;
        
        int firstline, lastline;
        int firstline_draw, lastline_draw;
        int displine;
        
        uint8_t *vram;
        int vrammask;

        uint32_t vram_limit;

        int video_res_x, video_res_y, video_bpp;

#ifdef JEGA
	uint8_t RMOD1, RMOD2, RDAGS, RDFFB, RDFSB, RDFAP, RPESL, RPULP, RPSSC, RPSSU, RPSSL;
	uint8_t RPPAJ;
	uint8_t RCMOD, RCCLH, RCCLL, RCCSL, RCCEL, RCSKW, ROMSL, RSTAT;
	int is_jega, font_index;
	int chr_left, chr_wide;
#endif
} ega_t;

extern int update_overscan;

void   *ega_standalone_init();
void    ega_out(uint16_t addr, uint8_t val, void *p);
uint8_t ega_in(uint16_t addr, void *p);
void    ega_poll(void *p);
void    ega_recalctimings(struct ega_t *ega);
void    ega_write(uint32_t addr, uint8_t val, void *p);
uint8_t ega_read(uint32_t addr, void *p);
void ega_init(ega_t *ega);

extern device_t ega_device;
extern device_t cpqega_device;
extern device_t sega_device;

#ifdef JEGA
#define SBCS 0
#define DBCS 1
#define ID_LEN 6
#define NAME_LEN 8
#define SBCS19_LEN 256 * 19
#define DBCS16_LEN 65536 * 32

extern uint8_t jfont_sbcs_19[SBCS19_LEN];	/* 256 * 19( * 8) */
extern uint8_t jfont_dbcs_16[DBCS16_LEN];	/* 65536 * 16 * 2 (* 8) */
#endif