96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
#ifndef _DEFLOAT16_H
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#define _DEFLOAT16_H
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/*-------------------------------------------------------------------------
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* drawElements Base Portability Library
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* -------------------------------------
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*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*//*!
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* \file
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* \brief 16-bit floating-point math.
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*//*--------------------------------------------------------------------*/
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#include "deDefs.h"
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#include "deMath.h"
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DE_BEGIN_EXTERN_C
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typedef deUint16 deFloat16;
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#if defined(DE_DEPRECATED_TYPES)
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typedef deFloat16 DEfloat16;
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#endif
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/*--------------------------------------------------------------------*//*!
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* \brief Convert 32-bit floating point number to 16 bit.
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* \param val32 Input value.
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* \return Converted 16-bit floating-point value.
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*//*--------------------------------------------------------------------*/
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deFloat16 deFloat32To16 (float val32);
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deFloat16 deFloat32To16Round (float val32, deRoundingMode mode);
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void deFloat16_selfTest (void);
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deFloat16 deFloat64To16 (double val64);
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deFloat16 deFloat64To16Round (double val64, deRoundingMode mode);
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/*--------------------------------------------------------------------*//*!
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* \brief Convert 16-bit floating point number to 32 bit.
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* \param val16 Input value.
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* \return Converted 32-bit floating-point value.
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*//*--------------------------------------------------------------------*/
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float deFloat16To32 (deFloat16 val16);
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/*--------------------------------------------------------------------*//*!
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* \brief Convert 16-bit floating point number to 64 bit.
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* \param val16 Input value.
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* \return Converted 64-bit floating-point value.
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*//*--------------------------------------------------------------------*/
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double deFloat16To64 (deFloat16 val16);
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DE_INLINE deBool deHalfIsPositiveZero(deFloat16 x)
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{
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return deFloat16To32(x) == 0 && (x >> 15) == 0;
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}
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DE_INLINE deBool deHalfIsNegativeZero(deFloat16 x)
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{
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return deFloat16To32(x) == 0 && (x >> 15) != 0;
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}
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static const deFloat16 deFloat16SignalingNaN = 0x7c01;
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static const deFloat16 deFloat16QuietNaN = 0x7e01;
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DE_INLINE deBool deHalfIsIEEENaN(deFloat16 x)
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{
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deUint16 e = (deUint16)((x & 0x7c00u) >> 10);
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deUint16 m = (x & 0x03ffu);
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return e == 0x1f && m != 0;
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}
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DE_INLINE deBool deHalfIsSignalingNaN(deFloat16 x)
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{
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return deHalfIsIEEENaN(x) && (x & (1u << 9)) == 0;
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}
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DE_INLINE deBool deHalfIsQuietNaN(deFloat16 x)
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{
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return deHalfIsIEEENaN(x) && (x & (1u << 9)) != 0;
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}
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DE_END_EXTERN_C
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#endif /* _DEFLOAT16_H */
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