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/* Starshatter OpenSource Distribution
Copyright (c) 1997-2004, Destroyer Studios LLC.
All Rights Reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name "Destroyer Studios" nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
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)
{
return static_cast<int>(d);
}
// +--------------------------------------------------------------------+
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() : val(0) { }
fix(int n) : val(n<<Precision) { }
fix(double d) : val(static_cast<long>(d * fix_sixty_five)) { }
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) { val = static_cast<long>(d * fix_sixty_five); 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 {
fix r;
r.val = (val * f.val) >> Precision;
return r; }
fix operator/(const fix& f) const {
fix r;
r.val = (val << Precision) / f.val;
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) {
val = (val * f.val) >> Precision;
return *this; }
fix& operator/=(const fix& f) {
val = (val << Precision) / f.val;
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) { val*=static_cast<long>(d); return *this; }
fix& operator/=(double d) { val/=static_cast<long>(d); 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 { return (*this) * num / den; }
// data:
long val;
};
#endif // Fix_h
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