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diff --git a/nGenEx/Fix.h b/nGenEx/Fix.h
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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)
-{
- 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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