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/* Project nGenEx
Destroyer Studios LLC
Copyright © 1997-2004. All Rights Reserved.
SUBSYSTEM: nGenEx.lib
FILE: Fix.h
AUTHOR: John DiCamillo
OVERVIEW
========
Fixed point number class with 16 bits of fractional precision
*/
#ifndef Fix_h
#define Fix_h
// +--------------------------------------------------------------------+
#include "Types.h"
// +--------------------------------------------------------------------+
const double fix_sixty_five=65536.0;
inline int fast_f2i(double d)
{
int i;
_asm {
fld d
fistp i
}
return i;
}
// +--------------------------------------------------------------------+
class fix
{
public:
static const char* TYPENAME() { return "fix"; }
enum FixDef { Precision=16, IntMask=0xffff0000, FractMask=0x0000ffff };
static const fix one;
static const fix two;
static const fix three;
static const fix five;
static const fix ten;
fix() { }
fix(int n) : val(n<<Precision) { }
fix(double d)
{
long ival;
_asm {
fld fix_sixty_five
fmul d
fistp ival
}
val=ival;
}
fix(const fix& f) : val(f.val) { }
// conversion operators:
operator int () const { return (val>>Precision); }
operator float () const { return ((float) val) / ((float) fix_sixty_five); }
operator double() const { return ((double) val) / fix_sixty_five; }
// assignment operators:
fix& operator=(const fix& f) { val=f.val; return *this; }
fix& operator=(int n) { val=(n<<Precision); return *this; }
fix& operator=(double d) { long ival;
_asm { fld fix_sixty_five
fmul d
fistp ival }
val = ival;
return *this; }
// comparison operators:
int operator==(const fix& f) const { return val==f.val; }
int operator!=(const fix& f) const { return val!=f.val; }
int operator<=(const fix& f) const { return val<=f.val; }
int operator>=(const fix& f) const { return val>=f.val; }
int operator< (const fix& f) const { return val< f.val; }
int operator> (const fix& f) const { return val> f.val; }
// arithmetic operators:
fix operator+(const fix& f) const { fix r; r.val = val+f.val; return r; }
fix operator-(const fix& f) const { fix r; r.val = val-f.val; return r; }
fix operator*(const fix& f) const { long a=val; long b=f.val;
_asm {
mov eax, a
mov edx, b
imul edx
shrd eax, edx, 16
mov a, eax
}
fix r; r.val = a; return r; }
fix operator/(const fix& f) const { long a=val; long b=f.val;
_asm {
mov eax, a
mov ebx, b
mov edx, eax
sar edx, 16
shl eax, 16
idiv ebx
mov a, eax
}
fix r; r.val = a; return r; }
fix& operator+=(const fix& f) { val+=f.val; return *this; }
fix& operator-=(const fix& f) { val-=f.val; return *this; }
fix& operator*=(const fix& f) { long a=val; long b=f.val;
_asm {
mov eax, a
mov edx, b
imul edx
shrd eax, edx, 16
mov a, eax
}
val=a; return *this; }
fix& operator/=(const fix& f) { long a=val; long b=f.val;
_asm {
mov eax, a
mov ebx, b
mov edx, eax
sar edx, 16
shl eax, 16
idiv ebx
mov a, eax
}
val=a; return *this; }
fix operator+(int n) const { fix r; r.val = val+(n<<Precision); return r; }
fix operator-(int n) const { fix r; r.val = val-(n<<Precision); return r; }
fix operator*(int n) const { fix r; r.val = val*n; return r; }
fix operator/(int n) const { fix r; r.val = val/n; return r; }
fix& operator+=(int n) { val+=(n<<Precision); return *this; }
fix& operator-=(int n) { val-=(n<<Precision); return *this; }
fix& operator*=(int n) { val*=n; return *this; }
fix& operator/=(int n) { val/=n; return *this; }
fix operator+(double d) const { fix f(d); return (*this)+f; }
fix operator-(double d) const { fix f(d); return (*this)-f; }
fix operator*(double d) const { fix f(d); return (*this)*f; }
fix operator/(double d) const { fix f(d); return (*this)/f; }
fix& operator+=(double d) { fix f(d); val+=f.val; return *this; }
fix& operator-=(double d) { fix f(d); val-=f.val; return *this; }
fix& operator*=(double d) { int n; _asm { fld d
fistp n } val*=n; return *this; }
fix& operator/=(double d) { int n; _asm { fld d
fistp n } val/=n; return *this; }
// misc. functions:
fix truncate() const { fix r; r.val = val&IntMask; return r; }
fix fraction() const { fix r; r.val = val-truncate().val; return r; }
fix floor() const { fix r; r.val = val&IntMask; return r; }
fix ceil() const { fix r; r.val = (val+FractMask)&IntMask; return r; }
fix adjust_up() const { fix r; r.val = val+FractMask; return r; }
fix adjust_down() const { fix r; r.val = val-FractMask; return r; }
fix muldiv(const fix& num, const fix& den) const
{ long a=val, b=num.val, c=den.val;
_asm {
mov eax, a
mov edx, b
mov ebx, c
imul edx
idiv ebx
mov a, eax
}
fix r; r.val = a; return r; }
// data:
long val;
};
#endif Fix_h
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