#ifndef __VGABIOS_H
#define __VGABIOS_H

#include "types.h" // u8
#include "farptr.h" // struct segoff_s

#define SCREEN_IO_START(x,y,p) (((((x)*(y)) | 0x00ff) + 1) * (p))
#define SCREEN_MEM_START(x,y,p) SCREEN_IO_START(((x)*2),(y),(p))

struct saveBDAstate {
    u8 video_mode;
    u16 video_cols;
    u16 video_pagesize;
    u16 crtc_address;
    u8 video_rows;
    u16 char_height;
    u8 video_ctl;
    u8 video_switches;
    u8 modeset_ctl;
    u16 cursor_type;
    u16 cursor_pos[8];
    u16 video_pagestart;
    u8 video_page;
    /* current font */
    struct segoff_s font0;
    struct segoff_s font1;
};

// vgatables.c
struct vgamode_s;
struct vgamode_s *find_vga_entry(u8 mode);
void build_video_param(void);
extern struct VideoSavePointer_s video_save_pointer_table;
extern u8 static_functionality[];

// vgafonts.c
extern u8 vgafont8[];
extern u8 vgafont14[];
extern u8 vgafont16[];
extern u8 vgafont14alt[];
extern u8 vgafont16alt[];

// vgabios.c
#define SET_VGA(var, val) SET_FARVAR(get_global_seg(), (var), (val))
struct carattr {
    u8 car, attr, use_attr;
};
struct cursorpos {
    u8 x, y, page;
};
void vga_set_mode(u8 mode, u8 noclearmem);

// vgafb.c
void clear_screen(struct vgamode_s *vmode_g);
void vgafb_scroll(int nblines, int attr
                  , struct cursorpos ul, struct cursorpos lr);
void vgafb_write_char(struct cursorpos cp, struct carattr ca);
struct carattr vgafb_read_char(struct cursorpos cp);
void vgafb_write_pixel(u8 color, u16 x, u16 y);
u8 vgafb_read_pixel(u16 x, u16 y);
void vgafb_load_font(u16 seg, void *src_far, u16 count
                     , u16 start, u8 destflags, u8 fontsize);

// clext.c
int cirrus_set_video_mode(u8 mode, u8 noclearmem);
void cirrus_init(void);

// vbe.c
#define VBE_OEM_STRING "SeaBIOS VBE(C) 2011"
#define VBE_VENDOR_STRING "SeaBIOS Developers"
#define VBE_PRODUCT_STRING "SeaBIOS VBE Adapter"
#define VBE_REVISION_STRING "Rev. 1"

struct vbe_modeinfo
{
    u16 width;
    u16 height;
    u8 depth;
    u16 linesize;
    u32 phys_base;
    u32 vram_size;
};

struct bregs;
void handle_104f(struct bregs *regs);

#endif // vgabios.h