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/*
* Copyright 2009 Free Software Foundation, Inc.
*
* This software is distributed under the terms of the GNU Affero Public License.
* See the COPYING file in the main directory for details.
*
* This use of this software may be subject to additional restrictions.
* See the LEGAL file in the main directory for details.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef F16_H
#define F16_H
#include <stdint.h>
#include <ostream>
/** Round a float to the appropriate F16 value. */
inline int32_t _f16_round(float f)
{
if (f>0.0F) return (int32_t)(f+0.5F);
if (f<0.0F) return (int32_t)(f-0.5F);
return 0;
}
/** A class for F15.16 fixed point arithmetic with saturation. */
class F16 {
private:
int32_t mV;
public:
F16() {}
F16(int i) { mV = i<<16; }
F16(float f) { mV = _f16_round(f*65536.0F); }
F16(double f) { mV = _f16_round((float)f*65536.0F); }
int32_t& raw() { return mV; }
const int32_t& raw() const { return mV; }
float f() const { return mV/65536.0F; }
//operator float() const { return mV/65536.0F; }
//operator int() const { return mV>>16; }
F16 operator=(float f)
{
mV = _f16_round(f*65536.0F);
return *this;
}
F16 operator=(int i)
{
mV = i<<16;
return *this;
}
F16 operator=(const F16& other)
{
mV = other.mV;
return mV;
}
F16 operator+(const F16& other) const
{
F16 retVal;
retVal.mV = mV + other.mV;
return retVal;
}
F16& operator+=(const F16& other)
{
mV += other.mV;
return *this;
}
F16 operator-(const F16& other) const
{
F16 retVal;
retVal.mV = mV - other.mV;
return retVal;
}
F16& operator-=(const F16& other)
{
mV -= other.mV;
return *this;
}
F16 operator*(const F16& other) const
{
F16 retVal;
int64_t p = (int64_t)mV * (int64_t)other.mV;
retVal.mV = p>>16;
return retVal;
}
F16& operator*=(const F16& other)
{
int64_t p = (int64_t)mV * (int64_t)other.mV;
mV = p>>16;
return *this;
}
F16 operator*(float f) const
{
F16 retVal;
retVal.mV = mV * f;
return retVal;
}
F16& operator*=(float f)
{
mV *= f;
return *this;
}
F16 operator/(const F16& other) const
{
F16 retVal;
int64_t pV = (int64_t)mV << 16;
retVal.mV = pV / other.mV;
return retVal;
}
F16& operator/=(const F16& other)
{
int64_t pV = (int64_t)mV << 16;
mV = pV / other.mV;
return *this;
}
F16 operator/(float f) const
{
F16 retVal;
retVal.mV = mV / f;
return retVal;
}
F16& operator/=(float f)
{
mV /= f;
return *this;
}
bool operator>(const F16& other) const
{
return mV>other.mV;
}
bool operator<(const F16& other) const
{
return mV<other.mV;
}
bool operator==(const F16& other) const
{
return mV==other.mV;
}
bool operator>(float f) const
{
return (mV/65536.0F) > f;
}
bool operator<(float f) const
{
return (mV/65536.0F) < f;
}
bool operator==(float f) const
{
return (mV/65536.0F) == f;
}
};
inline std::ostream& operator<<(std::ostream& os, const F16& v)
{
os << v.f();
return os;
}
#endif
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