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Diffstat (limited to 'nGenEx/Fix.h')
| -rw-r--r-- | nGenEx/Fix.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/nGenEx/Fix.h b/nGenEx/Fix.h new file mode 100644 index 0000000..b67185e --- /dev/null +++ b/nGenEx/Fix.h @@ -0,0 +1,180 @@ +/* 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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