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/*
* PC/HW routine collection v1.2 for DOS/DJGPP
*
* Copyright (C) 2002 - Borca Daniel
* Email : dborca@yahoo.com
* Web : http://www.geocities.com/dborca
*/
#include <dpmi.h>
#include "pc_hw.h"
#define MOUSE_STACK_SIZE 16384
#define CLEAR_MICKEYS() \
do { \
__asm __volatile ("movw $0xb, %%ax; int $0x33":::"%eax", "%ecx", "%edx"); \
ox = oy = 0; \
} while (0)
extern void mouse_wrapper (void);
extern void mouse_wrapper_end (void);
static MFUNC mouse_func;
static void *mouse_stack;
static long mouse_callback;
static __dpmi_regs mouse_regs;
static volatile int pc_mouse_x, pc_mouse_y, pc_mouse_b;
static int minx = 0;
static int maxx = 319;
static int miny = 0;
static int maxy = 199;
static int sx = 2;
static int sy = 2;
static int emulat3 = FALSE;
static int ox, oy;
static void mouse (__dpmi_regs *r)
{
int nx = (signed short)r->x.si / sx;
int ny = (signed short)r->x.di / sy;
int dx = nx - ox;
int dy = ny - oy;
ox = nx;
oy = ny;
pc_mouse_b = r->x.bx;
pc_mouse_x = MID(minx, pc_mouse_x + dx, maxx);
pc_mouse_y = MID(miny, pc_mouse_y + dy, maxy);
if (emulat3) {
if ((pc_mouse_b&3)==3) {
pc_mouse_b = 4;
}
}
if (mouse_func) {
mouse_func(pc_mouse_x, pc_mouse_y, pc_mouse_b);
}
} ENDOFUNC(mouse)
void pc_remove_mouse (void)
{
if (mouse_callback) {
pc_clexit(pc_remove_mouse);
__asm("\n\
movl %%edx, %%ecx \n\
shrl $16, %%ecx \n\
movw $0x0304, %%ax \n\
int $0x31 \n\
movw $0x000c, %%ax \n\
xorl %%ecx, %%ecx \n\
int $0x33 \n\
"::"d"(mouse_callback):"%eax", "%ecx");
mouse_callback = 0;
free((void *)((unsigned long)mouse_stack-MOUSE_STACK_SIZE));
}
}
int pc_install_mouse (void)
{
int buttons;
/* fail if already call-backed */
if (mouse_callback) {
return 0;
}
/* reset mouse and get status */
__asm("\n\
xorl %%eax, %%eax \n\
int $0x33 \n\
andl %%ebx, %%eax \n\
movl %%eax, %0 \n\
":"=g" (buttons)::"%eax", "%ebx");
if (!buttons) {
return 0;
}
/* lock wrapper */
LOCKDATA(mouse_func);
LOCKDATA(mouse_stack);
LOCKDATA(mouse_callback);
LOCKDATA(mouse_regs);
LOCKDATA(pc_mouse_x);
LOCKDATA(pc_mouse_y);
LOCKDATA(pc_mouse_b);
LOCKDATA(minx);
LOCKDATA(maxx);
LOCKDATA(miny);
LOCKDATA(maxy);
LOCKDATA(sx);
LOCKDATA(sy);
LOCKDATA(emulat3);
LOCKDATA(ox);
LOCKDATA(oy);
LOCKFUNC(mouse);
LOCKFUNC(mouse_wrapper);
/* grab a locked stack */
if ((mouse_stack=pc_malloc(MOUSE_STACK_SIZE))==NULL) {
return 0;
}
/* try to hook a call-back */
__asm("\n\
pushl %%ds \n\
pushl %%es \n\
movw $0x0303, %%ax \n\
pushl %%ds \n\
pushl %%cs \n\
popl %%ds \n\
popl %%es \n\
int $0x31 \n\
popl %%es \n\
popl %%ds \n\
jc 0f \n\
shll $16, %%ecx \n\
movw %%dx, %%cx \n\
movl %%ecx, %0 \n\
0: \n\
":"=g"(mouse_callback)
:"S" (mouse_wrapper), "D"(&mouse_regs)
:"%eax", "%ecx", "%edx");
if (!mouse_callback) {
free(mouse_stack);
return 0;
}
/* adjust stack */
mouse_stack = (void *)((unsigned long)mouse_stack + MOUSE_STACK_SIZE);
/* install the handler */
mouse_regs.x.ax = 0x000c;
mouse_regs.x.cx = 0x007f;
mouse_regs.x.dx = mouse_callback&0xffff;
mouse_regs.x.es = mouse_callback>>16;
__dpmi_int(0x33, &mouse_regs);
CLEAR_MICKEYS();
emulat3 = buttons<3;
pc_atexit(pc_remove_mouse);
return buttons;
}
MFUNC pc_install_mouse_handler (MFUNC handler)
{
MFUNC old;
if (!mouse_callback && !pc_install_mouse()) {
return NULL;
}
old = mouse_func;
mouse_func = handler;
return old;
}
void pc_mouse_area (int x1, int y1, int x2, int y2)
{
minx = x1;
maxx = x2;
miny = y1;
maxy = y2;
}
void pc_mouse_speed (int xspeed, int yspeed)
{
DISABLE();
sx = MAX(1, xspeed);
sy = MAX(1, yspeed);
ENABLE();
}
int pc_query_mouse (int *x, int *y)
{
*x = pc_mouse_x;
*y = pc_mouse_y;
return pc_mouse_b;
}
void pc_show_mouse (void)
{
/* not implemented */
}
void pc_scare_mouse (void)
{
/* not implemented */
}
void pc_unscare_mouse (void)
{
/* not implemented */
}
__asm("\n\
.text \n\
.balign 4 \n\
.global _mouse_wrapper \n\
_mouse_wrapper: \n\
cld \n\
lodsl \n\
movl %eax, %es:42(%edi) \n\
addw $4, %es:46(%edi) \n\
pushl %es \n\
movl %ss, %ebx \n\
movl %esp, %esi \n\
movl %cs:___djgpp_ds_alias, %ss \n\
movl %cs:_mouse_stack, %esp \n\
pushl %ss \n\
pushl %ss \n\
popl %es \n\
popl %ds \n\
movl ___djgpp_dos_sel, %fs \n\
pushl %fs \n\
popl %gs \n\
pushl %edi \n\
call _mouse \n\
popl %edi \n\
movl %ebx, %ss \n\
movl %esi, %esp \n\
popl %es \n\
iret \n\
.balign 4 \n\
.global _mouse_wrapper_end \n\
_mouse_wrapper_end:");
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