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63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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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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*
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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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*
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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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*
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*/
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#ifndef COMMON_XPFLOAT_H
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#define COMMON_XPFLOAT_H
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// 80-bit extended precision floating point
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// Mostly encountered stored as data on Apple systems
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#include "common/scummsys.h"
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namespace Common {
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struct XPFloat {
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uint16 signAndExponent;
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uint64 mantissa;
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enum Semantics {
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kSemanticsMC68881,
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kSemanticsSANE = kSemanticsMC68881,
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// Could add Intel 8087 and derivatives here since they're mostly compatible,
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// but have different NaN/INF flag cases.
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};
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XPFloat();
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XPFloat(uint16 signAndExponent, uint64 mantissa);
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static XPFloat fromDouble(double value, Semantics semantics = kSemanticsMC68881);
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static XPFloat fromDoubleBits(uint64 value, Semantics semantics = kSemanticsMC68881);
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void toDoubleSafe(double &result, bool &outOverflowed, Semantics semantics = kSemanticsMC68881) const;
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void toDoubleBitsSafe(uint64 &result, bool &outOverflowed, Semantics semantics = kSemanticsMC68881) const;
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// Simple version that clamps to infinity and warns on overflow
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double toDouble(Semantics semantics = kSemanticsMC68881) const;
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};
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inline XPFloat::XPFloat() : signAndExponent(0), mantissa(0) {}
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inline XPFloat::XPFloat(uint16 fSignAndExponent, uint64 fMantissa) : signAndExponent(fSignAndExponent), mantissa(fMantissa) {}
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}
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#endif
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