mirror of
https://github.com/ptitSeb/Serious-Engine
synced 2024-11-22 18:30:27 +01:00
86 lines
4.4 KiB
C++
86 lines
4.4 KiB
C++
/* Copyright (c) 2002-2012 Croteam Ltd. All rights reserved. */
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#ifndef SE_INCL_FIXINT_H
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#define SE_INCL_FIXINT_H
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#ifdef PRAGMA_ONCE
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#pragma once
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#endif
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/*
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* iInt - number of bits in integer part
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* iFrac - number of bits in fractional part
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* NOTE: Since 32 bit integer holds this fix int, iInt+iFrac must be 32.
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*/
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/*
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* Template class for fixed integer with arbitrary sizes of integer and fractional parts
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*/
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template<int iInt, int iFrac>
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class FixInt {
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//implementation:
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public:
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SLONG slHolder; // the representation is stored here
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//interface:
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public:
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/* Default constructor. */
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inline FixInt<iInt, iFrac>(void) {};
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/* Copy constructor. */
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inline FixInt<iInt, iFrac>(const FixInt<iInt, iFrac> &x) { slHolder = x.slHolder; };
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/* Constructor from integer. */
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inline FixInt<iInt, iFrac>(SLONG sl) : slHolder(sl<<iFrac) {};
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inline FixInt<iInt, iFrac>(ULONG ul) : slHolder((SLONG)(ul<<iFrac)) {};
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inline FixInt<iInt, iFrac>(SWORD sw) : slHolder((SLONG)(sw<<iFrac)) {};
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inline FixInt<iInt, iFrac>(UWORD uw) : slHolder((SLONG)(uw<<iFrac)) {};
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inline FixInt<iInt, iFrac>(SBYTE sb) : slHolder((SLONG)(sb<<iFrac)) {};
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inline FixInt<iInt, iFrac>(UBYTE ub) : slHolder((SLONG)(ub<<iFrac)) {};
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inline FixInt<iInt, iFrac>(signed int si) : slHolder((SLONG)(si<<iFrac)) {};
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inline FixInt<iInt, iFrac>(unsigned int ui) : slHolder((SLONG)(ui<<iFrac)) {};
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/* Constructor from float. */
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inline FixInt<iInt, iFrac>(float f) : slHolder((SLONG)(f*(1L<<iFrac))) {};
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inline FixInt<iInt, iFrac>(double f) : slHolder((SLONG)(f*(1L<<iFrac))) {};
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/* Set holder constructor. */
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inline FixInt<iInt, iFrac>(SLONG slNewHolder, int iDummy) : slHolder(slNewHolder) {};
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/* Conversion to integer (truncatenation). */
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inline operator SLONG(void) const { return slHolder>>iFrac; };
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/* Conversion to float (exact). */
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inline operator float(void) const { return slHolder/(float) (1L<<iFrac); };
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inline operator double(void) const { return slHolder/(double)(1L<<iFrac); };
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/* Negation. */
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inline FixInt<iInt, iFrac> operator-(void) const { return FixInt<iInt, iFrac>(-slHolder, 1); };
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/* Addition. */
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inline FixInt<iInt, iFrac> &operator+=(FixInt<iInt, iFrac> x) { slHolder += x.slHolder; return *this; };
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inline FixInt<iInt, iFrac> operator+(FixInt<iInt, iFrac> x) const { return FixInt<iInt, iFrac>(slHolder+x.slHolder, 1); };
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/* Substraction. */
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inline FixInt<iInt, iFrac> &operator-=(FixInt<iInt, iFrac> x) { slHolder -= x.slHolder; return *this;};
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inline FixInt<iInt, iFrac> operator-(FixInt<iInt, iFrac> x) const { return FixInt<iInt, iFrac>(slHolder-x.slHolder, 1); };
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/* Multiplication. */
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inline FixInt<iInt, iFrac> operator*(FixInt<iInt, iFrac> x) const { return FixInt<iInt, iFrac>( (SLONG)((__int64(slHolder)*x.slHolder) >>iFrac), 1); };
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inline FixInt<iInt, iFrac> operator*(SLONG sl) const { return FixInt<iInt, iFrac>(slHolder*sl, 1); };
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friend inline FixInt<iInt, iFrac> operator*(SLONG sl, FixInt<iInt, iFrac> x){ return FixInt<iInt, iFrac>(x.slHolder*sl, 1); };
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inline FixInt<iInt, iFrac> &operator*=(FixInt<iInt, iFrac> x) { return *this = *this*x; };
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/* Division. */
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inline FixInt<iInt, iFrac> operator/(FixInt<iInt, iFrac> x) const { return FixInt<iInt, iFrac>( (SLONG) ( (__int64(slHolder)<<iFrac) / x.slHolder ) , 1); };
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inline FixInt<iInt, iFrac> &operator/=(FixInt<iInt, iFrac> x) { return *this = *this/x; };
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/* Relational operators. */
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inline BOOL operator< (FixInt<iInt, iFrac> x) const { return slHolder< x.slHolder; };
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inline BOOL operator<=(FixInt<iInt, iFrac> x) const { return slHolder<=x.slHolder; };
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inline BOOL operator> (FixInt<iInt, iFrac> x) const { return slHolder> x.slHolder; };
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inline BOOL operator>=(FixInt<iInt, iFrac> x) const { return slHolder>=x.slHolder; };
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inline BOOL operator==(FixInt<iInt, iFrac> x) const { return slHolder==x.slHolder; };
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inline BOOL operator!=(FixInt<iInt, iFrac> x) const { return slHolder!=x.slHolder; };
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/* Rounding and truncatenation functions. */
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friend inline SLONG Floor(FixInt<iInt, iFrac> x) { return (x.slHolder)>>iFrac; };
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friend inline SLONG Ceil(FixInt<iInt, iFrac> x) { return (x.slHolder+(0xFFFFFFFFL>>iInt))>>iFrac; };
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/* Truncatenate to fixed number of decimal bits. */
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friend inline FixInt<iInt, iFrac> Trunc(FixInt<iInt, iFrac> x, int iDecimalPart) {
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return FixInt<iInt, iFrac>(x.slHolder& (0xFFFFFFFF*((1<<iFrac)/iDecimalPart)), 1);};
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};
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#endif /* include-once check. */
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