🚀 go-pugleaf

buxduac@dct.ac.uk writes:

>How does a mouse driver draw it cursor on the screen ?  Does it use a
>nice safe DOS function or does it have to do the bit manipulation itself ?
>  I know int 33H function 09 sets the cursor shape but the drawing I
>can not find !.

Int 33h 09h does indeed set the cursor shape and it uses ES:DX for pointer
to screen and cursor.  (ES segment, DX offset).

You will need a function which defines segment:offset such as MSC && TC++
FP_OFF() and FP_SEG().

/***
 * file:    mouse.h
 * purpose: mouse defines
 ***/

#ifndef MOUSE

#define LBUTTON             0
#define RBUTTON             1

#define SOFT_TEXT_CURSOR    0
#define HARD_TEXT_CURSOR    1

#define MOUSE_BUS           1
#define MOUSE_SERIAL        2
#define MOUSE_INPORT        3
#define MOUSE_PS2           4
#define MOUSE_MP            5

#define IRQ_PS2             0

struct graph_cur {
    int screen_mask[16];
    int cursor_mask[16];
    int spotx;
    int spoty;
};

/* graphics mode cursor, hour glass */
static struct graph_cur far gcursor_hour = {
    /* screen mask */
    0x0000,
    0x0000,
    0x0000,
    0x8001,
    0xC003,
    0xE007,
    0xF00F,
    0xE007,
    0xC003,
    0x8001,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,

    /* cursor mask */
    0x0000,
    0x7FFE,
    0x6006,
    0x300C,
    0x1818,
    0x0C30,
    0x0660,
    0x03C0,
    0x0660,
    0x0C30,
    0x1998,
    0x33CC,
    0x67E6,
    0x7FFE,
    0x0000,
    0x0000,

    /* hot spot x, y */
    07, 07
};

#define MOUSE
#endif


void m_cursor(struct graph_cur far *cursor)
{
    unsigned seg = FP_SEG(cursor);
    unsigned off = FP_OFF(cursor);
    int spotx = cursor->spotx;
    int spoty = cursor->spoty;

    _asm {
        mov     ax, 9
        mov     bx, spotx
        mov     cx, spoty
        mov     es, seg
        mov     dx, off
        int     33h
    }
}

Lee Hollingworth
s1110238@giaeb.cc.monash.edu.au