231 lines
5.1 KiB
C
231 lines
5.1 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Emulation of the EGA and Chips & Technologies SuperEGA
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* graphics cards.
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*
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*
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*
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* Authors: Sarah Walker, <https://pcem-emulator.co.uk/>
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* Miran Grca, <mgrca8@gmail.com>
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*
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* Copyright 2008-2020 Sarah Walker.
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* Copyright 2016-2020 Miran Grca.
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*/
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#ifndef VIDEO_EGA_H
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#define VIDEO_EGA_H
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#if defined(EMU_MEM_H) && defined(EMU_ROM_H)
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typedef struct ega_t {
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mem_mapping_t mapping;
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rom_t bios_rom;
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uint8_t crtcreg;
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uint8_t gdcaddr;
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uint8_t attraddr;
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uint8_t attrff;
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uint8_t attr_palette_enable;
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uint8_t seqaddr;
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uint8_t miscout;
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uint8_t writemask;
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uint8_t la;
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uint8_t lb;
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uint8_t lc;
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uint8_t ld;
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uint8_t status;
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uint8_t colourcompare;
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uint8_t colournocare;
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uint8_t scrblank;
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uint8_t plane_mask;
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uint8_t ctl_mode;
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uint8_t color_mux;
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uint8_t dot;
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uint8_t crtc[256];
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uint8_t gdcreg[256];
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uint8_t attrregs[32];
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uint8_t seqregs[64];
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uint8_t egapal[16];
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uint8_t regs[256];
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uint8_t *vram;
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uint16_t light_pen;
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int vidclock;
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int fast;
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int extvram;
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int vres;
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int readmode;
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int writemode;
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int readplane;
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int vrammask;
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int chain4;
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int chain2_read;
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int chain2_write;
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int cursorvisible;
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int oddeven_page;
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int oddeven_chain;
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int vc;
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int real_vc;
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int scanline;
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int dispon;
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int hdisp_on;
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int cursoron;
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int blink;
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int fullchange;
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int linepos;
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int vslines;
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int linecountff;
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int oddeven;
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int lowres;
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int interlace;
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int linedbl;
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int lindebl;
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int rowcount;
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int vtotal;
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int dispend;
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int vsyncstart;
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int split;
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int hdisp;
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int hdisp_old;
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int htotal;
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int hdisp_time;
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int rowoffset;
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int vblankstart;
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int scrollcache;
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int firstline;
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int lastline;
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int firstline_draw;
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int lastline_draw;
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int x_add;
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int y_add;
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int displine;
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int res_x;
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int res_y;
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int bpp;
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int index;
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int remap_required;
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int actual_type;
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int chipset;
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int mono_display;
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int mda_attr_to_color_table[256][2][2];
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uint32_t charseta;
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uint32_t charsetb;
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uint32_t memaddr_latch;
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uint32_t memaddr;
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uint32_t memaddr_backup;
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uint32_t cursoraddr;
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uint32_t vram_limit;
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uint32_t overscan_color;
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uint32_t cca;
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uint32_t *pallook;
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uint64_t dispontime;
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uint64_t dispofftime;
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uint64_t dot_time;
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pc_timer_t timer;
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pc_timer_t dot_timer;
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double dot_clock;
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void * eeprom;
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uint32_t (*remap_func)(struct ega_t *ega, uint32_t in_addr);
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void (*render)(struct ega_t *svga);
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/* If set then another device is driving the monitor output and the EGA
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card should not attempt to display anything. */
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void (*render_override)(void *priv);
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void * priv_parent;
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uint8_t alt_addr; /* 0 for 0x3XX range, 1 for 0x2XX range */
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} ega_t;
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#endif
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#ifdef EMU_DEVICE_H
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extern const device_t ega_device;
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extern const device_t cpqega_device;
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extern const device_t sega_device;
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extern const device_t atiega800p_device;
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extern const device_t iskra_ega_device;
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extern const device_t et2000_device;
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extern const device_t jega_device;
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extern const device_t jvga_device;
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#endif
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extern int update_overscan;
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#define DISPLAY_RGB 0
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#define DISPLAY_COMPOSITE 1
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#define DISPLAY_RGB_NO_BROWN 2
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#define DISPLAY_GREEN 3
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#define DISPLAY_AMBER 4
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#define DISPLAY_WHITE 5
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#if defined(EMU_MEM_H) && defined(EMU_ROM_H)
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extern void ega_init(ega_t *ega, int monitor_type, int is_mono);
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extern void ega_recalctimings(struct ega_t *ega);
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extern void ega_recalc_remap_func(struct ega_t *ega);
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#endif
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extern void ega_out(uint16_t addr, uint8_t val, void *priv);
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extern uint8_t ega_in(uint16_t addr, void *priv);
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extern void ega_poll(void *priv);
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extern void ega_write(uint32_t addr, uint8_t val, void *priv);
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extern uint8_t ega_read(uint32_t addr, void *priv);
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extern void ega_set_type(void *priv, uint32_t local);
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extern int firstline_draw;
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extern int lastline_draw;
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extern int displine;
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extern int scanline;
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extern uint32_t memaddr;
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extern uint32_t cursoraddr;
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extern int cursorvisible;
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extern int cursoron;
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extern int cgablink;
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extern int scrollcache;
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extern uint8_t edatlookup[4][4];
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extern uint8_t egaremap2bpp[256];
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#if defined(EMU_MEM_H) && defined(EMU_ROM_H)
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void ega_render_blank(ega_t *ega);
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void ega_render_overscan_left(ega_t *ega);
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void ega_render_overscan_right(ega_t *ega);
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void ega_render_text(ega_t *ega);
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void ega_render_graphics(ega_t *ega);
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#endif
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enum {
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EGA_IBM = 0,
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EGA_COMPAQ,
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EGA_SUPEREGA,
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EGA_ATI800P,
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EGA_ISKRA,
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EGA_TSENG
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};
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enum {
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EGA_TYPE_IBM = 0,
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EGA_TYPE_OTHER = 1,
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EGA_TYPE_COMPAQ = 2
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};
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#endif /*VIDEO_EGA_H*/
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