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205 lines
6.2 KiB
205 lines
6.2 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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#ifndef hsWideDefined |
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#define hsWideDefined |
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#include "hsTypes.h" |
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struct hsWide { |
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Int32 fHi; |
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UInt32 fLo; |
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hsWide* Set(Int32 lo) { fLo = lo; if (lo < 0) fHi = -1L; else fHi = 0; return this; } |
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hsWide* Set(Int32 hi, UInt32 lo) { fHi = hi; fLo = lo; return this; } |
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inline hsBool IsNeg() const { return fHi < 0; } |
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inline hsBool IsPos() const { return fHi > 0 || (fHi == 0 && fLo != 0); } |
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inline hsBool IsZero() const { return fHi == 0 && fLo == 0; } |
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inline hsBool IsWide() const; |
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hsBool operator==(const hsWide& b) const { return fHi == b.fHi && fLo == b.fLo; } |
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hsBool operator<(const hsWide& b) const { return fHi < b.fHi || fHi == b.fHi && fLo < b.fLo; } |
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hsBool operator>( const hsWide& b) const { return fHi > b.fHi || fHi == b.fHi && fLo > b.fLo; } |
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hsBool operator!=( const hsWide& b) const { return !( *this == b); } |
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hsBool operator<=(const hsWide& b) const { return !(*this > b); } |
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hsBool operator>=(const hsWide& b) const { return !(*this < b); } |
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inline hsWide* Negate(); |
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inline hsWide* Add(Int32 scaler); |
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inline hsWide* Add(const hsWide* a); |
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inline hsWide* Sub(const hsWide* a); |
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inline hsWide* ShiftLeft(unsigned shift); |
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inline hsWide* ShiftRight(unsigned shift); |
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inline hsWide* RoundRight(unsigned shift); |
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inline Int32 AsLong() const; // return bits 31-0, checking for over/under flow |
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inline hsFixed AsFixed() const; // return bits 47-16, checking for over/under flow |
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inline hsFract AsFract() const; // return bits 61-30, checking for over/under flow |
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hsWide* Mul(Int32 a); // this updates the wide |
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hsWide* Mul(Int32 a, Int32 b); // this sets the wide |
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hsWide* Div(Int32 denom); // this updates the wide |
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hsWide* Div(const hsWide* denom); // this updates the wide |
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hsFixed FixDiv(const hsWide* denom) const; |
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hsFract FracDiv(const hsWide* denom) const; |
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Int32 Sqrt() const; |
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Int32 CubeRoot() const; |
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#if HS_CAN_USE_FLOAT |
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double AsDouble() const { return fHi * double(65536) * double(65536) + fLo; } |
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hsWide* Set(double d) |
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{ |
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Int32 hi = Int32(d / double(65536) / double(65536)); |
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Int32 lo = Int32(d - double(hi)); |
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return Set(hi, lo); |
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} |
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#endif |
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}; |
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const hsWide kPosInfinity64 = { kPosInfinity32, 0xffffffff }; |
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const hsWide kNegInfinity64 = { kNegInfinity32, 0 }; |
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/////////////////////// Inline implementations /////////////////////// |
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#define TOP2BITS(n) (UInt32(n) >> 30) |
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#define TOP3BITS(n) (UInt32(n) >> 29) |
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#if HS_PIN_MATH_OVERFLOW && HS_DEBUG_MATH_OVERFLOW |
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#define hsSignalMathOverflow() hsDebugMessage("Math overflow", 0) |
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#define hsSignalMathUnderflow() hsDebugMessage("Math underflow", 0) |
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#else |
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#define hsSignalMathOverflow() |
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#define hsSignalMathUnderflow() |
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#endif |
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#define WIDE_ISNEG(hi, lo) (Int32(hi) < 0) |
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#define WIDE_LESSTHAN(hi, lo, hi2, lo2) ((hi) < (hi2) || (hi) == (hi2) && (lo) < (lo2)) |
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#define WIDE_SHIFTLEFT(outH, outL, inH, inL, shift) do { (outH) = ((inH) << (shift)) | ((inL) >> (32 - (shift))); (outL) = (inL) << (shift); } while (0) |
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#define WIDE_NEGATE(hi, lo) do { (hi) = ~(hi); if (((lo) = -Int32(lo)) == 0) (hi) += 1; } while (0) |
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#define WIDE_ADDPOS(hi, lo, scaler) do { UInt32 tmp = (lo) + (scaler); if (tmp < (lo)) (hi) += 1; (lo) = tmp; } while (0) |
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#define WIDE_SUBWIDE(hi, lo, subhi, sublo) do { (hi) -= (subhi); if ((lo) < (sublo)) (hi) -= 1; (lo) -= (sublo); } while (0) |
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/////////////////////// Inline implementations /////////////////////// |
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inline hsWide* hsWide::Negate() |
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{ |
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WIDE_NEGATE(fHi, fLo); |
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return this; |
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} |
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inline hsWide* hsWide::Add(Int32 scaler) |
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{ |
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if (scaler >= 0) |
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WIDE_ADDPOS(fHi, fLo, scaler); |
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else |
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{ scaler = -scaler; |
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if (fLo < UInt32(scaler)) |
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fHi--; |
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fLo -= scaler; |
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} |
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return this; |
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} |
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inline hsWide* hsWide::Add(const hsWide* a) |
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{ |
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UInt32 newLo = fLo + a->fLo; |
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fHi += a->fHi; |
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if (newLo < (fLo | a->fLo)) |
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fHi++; |
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fLo = newLo; |
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return this; |
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} |
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inline hsWide* hsWide::Sub(const hsWide* a) |
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{ |
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WIDE_SUBWIDE(fHi, fLo, a->fHi, a->fLo); |
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return this; |
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} |
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inline hsWide* hsWide::ShiftLeft(unsigned shift) |
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{ |
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WIDE_SHIFTLEFT(fHi, fLo, fHi, fLo, shift); |
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return this; |
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} |
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inline hsWide* hsWide::ShiftRight(unsigned shift) |
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{ |
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fLo = (fLo >> shift) | (fHi << (32 - shift)); |
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fHi = fHi >> shift; // fHi >>= shift; Treated as logical shift on CW9-WIN32, which breaks for fHi < 0 |
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return this; |
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} |
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inline hsWide* hsWide::RoundRight(unsigned shift) |
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{ |
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return this->Add(1L << (shift - 1))->ShiftRight(shift); |
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} |
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inline Int32 hsWide::AsLong() const |
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{ |
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#if HS_PIN_MATH_OVERFLOW |
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if (fHi > 0 || fHi == 0 && (Int32)fLo < 0) |
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{ hsSignalMathOverflow(); |
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return kPosInfinity32; |
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} |
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if (fHi < -1L || fHi == -1L && (Int32)fLo >= 0) |
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{ hsSignalMathOverflow(); |
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return kNegInfinity32; |
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} |
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#endif |
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return (Int32)fLo; |
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} |
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inline hsBool hsWide::IsWide() const |
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{ |
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return (fHi > 0 || fHi == 0 && (Int32)fLo < 0) || (fHi < -1L || fHi == -1L && (Int32)fLo >= 0); |
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} |
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inline hsFixed hsWide::AsFixed() const |
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{ |
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hsWide tmp = *this; |
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return tmp.RoundRight(16)->AsLong(); |
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} |
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inline hsFract hsWide::AsFract() const |
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{ |
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hsWide tmp = *this; |
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return tmp.RoundRight(30)->AsLong(); |
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} |
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#endif
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