typedef struct Cursor Cursor;

typedef struct Cursor Cursor;
typedef struct Cursorinfo Cursorinfo;
struct Cursorinfo {
Cursor;
Lock;
};

/* devmouse.c */
extern void mousetrack(int, int, int);
extern Point mousexy(void);

extern void mouseaccelerate(int);
extern int m3mouseputc(Queue*, int);
extern int mouseputc(Queue*, int);

extern Cursorinfo cursor;
extern Cursor arrow;

/*
* Generic VGA registers.
*/
enum {
MiscW = 0x03C2, /* Miscellaneous Output (W) */
MiscR = 0x03CC, /* Miscellaneous Output (R) */
Status0 = 0x03C2, /* Input status 0 (R) */
Status1 = 0x03DA, /* Input Status 1 (R) */
FeatureR = 0x03CA, /* Feature Control (R) */
FeatureW = 0x03DA, /* Feature Control (W) */

Seqx = 0x03C4, /* Sequencer Index, Data at Seqx+1 */
Crtx = 0x03D4, /* CRT Controller Index, Data at Crtx+1 */
Grx = 0x03CE, /* Graphics Controller Index, Data at Grx+1 */
Attrx = 0x03C0, /* Attribute Controller Index and Data */

PaddrW = 0x03C8, /* Palette Address Register, write */
Pdata = 0x03C9, /* Palette Data Register */
Pixmask = 0x03C6, /* Pixel Mask Register */
PaddrR = 0x03C7, /* Palette Address Register, read */
Pstatus = 0x03C7, /* DAC Status (RO) */

Pcolours = 256, /* Palette */
Pred = 0,
Pgreen = 1,
Pblue = 2,

Pblack = 0x00,
Pwhite = 0xFF,
};

#define vgai(port) inb(port)
#define vgao(port, data) outb(port, data)

extern int vgaxi(long, uchar);
extern int vgaxo(long, uchar, uchar);

/*
*/
typedef struct VGAdev VGAdev;
typedef struct VGAcur VGAcur;
typedef struct VGAscr VGAscr;

struct VGAdev {
char* name;

void (*enable)(VGAscr*);
void (*disable)(VGAscr*);
void (*page)(VGAscr*, int);
ulong (*linear)(VGAscr*, int*, int*);
void (*drawinit)(VGAscr*);
int (*fill)(VGAscr*, Rectangle, ulong);

};

struct VGAcur {
char* name;

void (*enable)(VGAscr*);
void (*disable)(VGAscr*);
void (*load)(VGAscr*, Cursor*);
int (*move)(VGAscr*, Point);

int doespanning;
};

/*
*/
struct VGAscr {
Lock devlock;
VGAdev* dev;

VGAcur* cur;
ulong storage;
Cursor;

int useflush;

ulong aperture; /* physical address, kernel */
ulong pciaddr; /* physical address, user */
int isupamem;
int apsize;

ulong io; /* device specific registers */

ulong colormap[Pcolours][3];
int palettedepth;

ulong *mmio;
Memimage* gscreen;
Memdata* gscreendata;
Memsubfont* memdefont;

int (*fill)(VGAscr*, Rectangle, ulong);
int (*scroll)(VGAscr*, Rectangle, Rectangle);
void (*blank)(VGAscr*, int);
ulong id; /* internal identifier for driver use */
};

extern VGAscr vgascreen[];

enum {
Backgnd = 0, /* black */
};

/* mouse.c */
extern void mousectl(char*[], int);

/* screen.c */
extern int hwaccel; /* use hw acceleration; default on */
extern int hwblank; /* use hw blanking; default on */
extern void flushmemscreen(Rectangle);
extern int cursoron(int);
extern void cursoroff(int);
extern void setcursor(Cursor*);
extern int screensize(int, int, int, ulong);
extern int screenaperture(int, int);
extern Rectangle physgscreenr; /* actual monitor size */
extern void blankscreen(int);

/* devdraw.c */
extern void deletescreenimage(void);
extern int drawhasclients(void);
extern ulong blanktime;
/* vga.c */
extern void vgascreenwin(VGAscr*);
extern void vgaimageinit(ulong);
extern ulong vgapcilinear(VGAscr*, int*, int*, int, int);

extern void drawblankscreen(int);
extern void vgablank(VGAscr*, int);