/*** thinlib (c) 2000 Matthew Conte (matt@conte.com)****** This program is free software; you can redistribute it and/or** modify it under the terms of version 2 of the GNU Library General ** Public License as published by the Free Software Foundation.**** This program is distributed in the hope that it will be useful, ** but WITHOUT ANY WARRANTY; without even the implied warranty of** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU ** Library General Public License for more details.  To obtain a ** copy of the GNU Library General Public License, write to the Free ** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.**** Any permitted reproduction of these routines, in whole or in part,** must bear this legend.****** tl_mouse.c**** DOS mouse handling routines** $Id: tl_mouse.c,v 1.4 2000/12/16 21:18:11 matt Exp $*/#include <stdio.h>#include <dpmi.h>#include <go32.h>#include "tl_types.h"#include "tl_mouse.h"#define  MOUSE_MAX_BUTTONS 3#define  MOUSE_FIX         8  // 24.8 fixpoint#define  MOUSE_INT         0x33#define  INT_GET_MICKEYS   0x0B#define  INT_GET_BUTTONS   0x03static struct{   int xpos, ypos;   int last_x, last_y;   int maxwidth, maxheight;   int num_buttons;   int delta_shift;   uint8 button;   bool enabled;} mouse;static void _get_mickeys(void){   __dpmi_regs r;   /* get mickeys */   r.x.ax = INT_GET_MICKEYS;   __dpmi_int(MOUSE_INT, &r);   mouse.xpos += ((int16) r.x.cx << MOUSE_FIX) >> mouse.delta_shift;   mouse.ypos += ((int16) r.x.dx << MOUSE_FIX) >> mouse.delta_shift;   if (mouse.xpos < 0)      mouse.xpos = 0;   else if (mouse.xpos > mouse.maxwidth)      mouse.xpos = mouse.maxwidth;   if (mouse.ypos < 0)      mouse.ypos = 0;   else if (mouse.ypos > mouse.maxheight)      mouse.ypos = mouse.maxheight;}static uint8 _get_buttons(void){   __dpmi_regs r;   uint8 left, middle, right;      r.x.ax = INT_GET_BUTTONS;   __dpmi_int(MOUSE_INT, &r);   left = (r.x.bx & 1);   right = ((r.x.bx >> 1) & 1);   middle = ((r.x.bx >> 2) & 1);   mouse.button = right << THIN_MOUSE_RIGHT                  | middle << THIN_MOUSE_MIDDLE                  | left << THIN_MOUSE_LEFT;   return mouse.button;}uint8 thin_mouse_getmotion(int *dx, int *dy){   if (false == mouse.enabled)   {      *dx = *dy = 0;      return 0;   }   mouse.last_x = mouse.xpos;   mouse.last_y = mouse.ypos;   _get_mickeys();   *dx = (mouse.xpos - mouse.last_x) >> MOUSE_FIX;   *dy = (mouse.ypos - mouse.last_y) >> MOUSE_FIX;   return _get_buttons();}uint8 thin_mouse_getpos(int *x, int *y){   if (false == mouse.enabled)   {      *x = *y = 0;      return 0;   }   _get_mickeys();   *x = mouse.xpos >> MOUSE_FIX;   *y = mouse.ypos >> MOUSE_FIX;   return _get_buttons();}void thin_mouse_setrange(int width, int height){   if (false == mouse.enabled)      return;   mouse.maxwidth = (width - 1) << MOUSE_FIX;   mouse.maxheight = (height - 1) << MOUSE_FIX;}/* Set up mouse, center pointer */int thin_mouse_init(int width, int height, int delta_shift){   __dpmi_regs r;   r.x.ax = 0x00;   __dpmi_int(MOUSE_INT, &r);   if (0 == r.x.ax)   {      mouse.enabled = false;      return -1;   }   mouse.enabled = true;   mouse.num_buttons = r.x.bx;   if (r.x.bx == 0xFFFF)      mouse.num_buttons = 2;   mouse.delta_shift = delta_shift;   if (mouse.num_buttons > 3)      mouse.num_buttons = 3;   mouse.button = 0;   mouse.maxwidth = (width - 1) << MOUSE_FIX;   mouse.maxheight = (height - 1) << MOUSE_FIX;   mouse.xpos = (width / 2) << MOUSE_FIX;   mouse.ypos = (height / 2) << MOUSE_FIX;   mouse.last_x = mouse.xpos;   mouse.last_y = mouse.ypos;   return 0;}/*** $Log: tl_mouse.c,v $** Revision 1.4  2000/12/16 21:18:11  matt** thinlib cleanups**** Revision 1.3  2000/11/06 02:22:09  matt** button bug**** Revision 1.2  2000/11/05 16:32:36  matt** thinlib round 2**** Revision 1.1  2000/11/05 06:29:03  matt** initial revision***/