framework/delibs/debase/deFloat16.h

#ifndef _DEFLOAT16_H
#define _DEFLOAT16_H
/*-------------------------------------------------------------------------
 * drawElements Base Portability Library
 * -------------------------------------
 *
 * Copyright 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *//*!
 * \file
 * \brief 16-bit floating-point math.
 *//*--------------------------------------------------------------------*/

#include "deDefs.h"
#include "deMath.h"

DE_BEGIN_EXTERN_C

typedef		deUint16			deFloat16;

#if defined(DE_DEPRECATED_TYPES)
typedef		deFloat16			DEfloat16;
#endif

/*--------------------------------------------------------------------*//*!
 * \brief Convert 32-bit floating point number to 16 bit.
 * \param val32	Input value.
 * \return Converted 16-bit floating-point value.
 *//*--------------------------------------------------------------------*/
deFloat16	deFloat32To16				(float val32);
deFloat16	deFloat32To16Round			(float val32, deRoundingMode mode);
void		deFloat16_selfTest			(void);

deFloat16	deFloat64To16				(double val64);
deFloat16	deFloat64To16Round			(double val64, deRoundingMode mode);

/*--------------------------------------------------------------------*//*!
 * \brief Convert 16-bit floating point number to 32 bit.
 * \param val16	Input value.
 * \return Converted 32-bit floating-point value.
 *//*--------------------------------------------------------------------*/
float		deFloat16To32		(deFloat16 val16);

/*--------------------------------------------------------------------*//*!
 * \brief Convert 16-bit floating point number to 64 bit.
 * \param val16	Input value.
 * \return Converted 64-bit floating-point value.
 *//*--------------------------------------------------------------------*/
double		deFloat16To64		(deFloat16 val16);

DE_INLINE deUint16 deHalfExponent(deFloat16 x)
{
	return (deUint16)((x & 0x7c00u) >> 10);
}

DE_INLINE deUint16 deHalfMantissa(deFloat16 x)
{
	return (deUint16)(x & 0x03ffu);
}

DE_INLINE deUint16 deHalfHighestMantissaBit(deFloat16 x)
{
	return (deUint16)(x & (1u << 9));
}

DE_INLINE deUint16 deHalfSign(deFloat16 x)
{
	return (deUint16)(x >> 15);
}

static const deUint16 deHalfMaxExponent = 0x1f;

DE_INLINE deBool deHalfIsZero(deFloat16 x)
{
	return deHalfExponent(x) == 0 && deHalfMantissa(x) == 0;
}

DE_INLINE deBool deHalfIsPositiveZero(deFloat16 x)
{
	return deHalfIsZero(x) && (deHalfSign(x) == 0);
}

DE_INLINE deBool deHalfIsNegativeZero(deFloat16 x)
{
	return deHalfIsZero(x) && (deHalfSign(x) != 0);
}

static const deFloat16 deFloat16SignalingNaN = 0x7c01;
static const deFloat16 deFloat16QuietNaN = 0x7e01;

DE_INLINE deBool deHalfIsIEEENaN(deFloat16 x)
{
	return deHalfExponent(x) == deHalfMaxExponent && deHalfMantissa(x) != 0;
}

DE_INLINE deBool deHalfIsSignalingNaN(deFloat16 x)
{
	return deHalfIsIEEENaN(x) && deHalfHighestMantissaBit(x) == 0;
}

DE_INLINE deBool deHalfIsQuietNaN(deFloat16 x)
{
	return deHalfIsIEEENaN(x) && deHalfHighestMantissaBit(x) != 0;
}

DE_INLINE deBool deHalfIsInf(deFloat16 x)
{
	return deHalfExponent(x) == deHalfMaxExponent && deHalfMantissa(x) == 0;
}

DE_INLINE deBool deHalfIsPositiveInf(deFloat16 x)
{
	return deHalfIsInf(x) && (deHalfSign(x) == 0);
}

DE_INLINE deBool deHalfIsNegativeInf(deFloat16 x)
{
	return deHalfIsInf(x) && (deHalfSign(x) != 0);
}

DE_INLINE deBool deHalfIsDenormal(deFloat16 x)
{
	return deHalfExponent(x) == 0 && deHalfMantissa(x) != 0;
}

DE_END_EXTERN_C

#endif /* _DEFLOAT16_H */