io_mouse.c

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/* console mode mouse functions */

#include "../fb.h"
#include "fb_private_console.h"
#include <dpmi.h>

static int inited = -1;
static int wheel_ok = FALSE;
static int wheel_pos;
static __dpmi_regs regs;

int fb_ConsoleGetMouse( int *x, int *y, int *z, int *buttons, int *clip )
{
        if (inited == -1) {
                regs.x.ax = 0x0;        /* detect mouse driver and mouse existence */
                __dpmi_int(0x33, &regs);
                inited = (regs.x.ax == 0) ? 0 : 1;

                regs.x.ax = 0x11;       /* detect CuteMouse 2.0+ wheel api */
                __dpmi_int(0x33, &regs);
                wheel_ok = ((regs.x.ax == 0x574D) && (regs.x.cx & 1));

                wheel_pos = 0;
        }

        if (inited == 0) {
                if (x) *x = -1;
                if (y) *y = -1;
                if (z) *z = -1;
                if (buttons) *buttons = -1;
                return fb_ErrorSetNum(FB_RTERROR_ILLEGALFUNCTIONCALL);
        }

        regs.x.ax = 0x3;
        __dpmi_int(0x33, &regs);

        if (wheel_ok) wheel_pos -= *(signed char *)(&regs.h.bh);

        if (x) *x = regs.x.cx / 8;      /* char width is 8 pixels */
        if (y) *y = regs.x.dx / 8;      /* char height is 8 pixels */
        if (z) *z = wheel_pos;
        if (buttons) *buttons = regs.h.bl;
        if (clip) *clip = 0;

        return FB_RTERROR_OK;
}

int fb_ConsoleSetMouse( int x, int y, int cursor, int clip )
{
        int mx, my;

        fb_ConsoleGetMouse(&mx, &my, NULL, NULL, NULL);

        if (inited == 0) return fb_ErrorSetNum(FB_RTERROR_ILLEGALFUNCTIONCALL);

        if (x >= 0) mx = x * 8;
        if (y >= 0) my = y * 8;

        regs.x.ax = 0x4;
        regs.x.cx = mx;
        regs.x.dx = my;
        __dpmi_int(0x33, &regs);

        return FB_RTERROR_OK;
}