1 #ifndef _DEFLOAT16_H 2 #define _DEFLOAT16_H 3 /*------------------------------------------------------------------------- 4 * drawElements Base Portability Library 5 * ------------------------------------- 6 * 7 * Copyright 2014 The Android Open Source Project 8 * 9 * Licensed under the Apache License, Version 2.0 (the "License"); 10 * you may not use this file except in compliance with the License. 11 * You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 * 21 *//*! 22 * \file 23 * \brief 16-bit floating-point math. 24 *//*--------------------------------------------------------------------*/ 25 26 #include "deDefs.h" 27 #include "deMath.h" 28 29 DE_BEGIN_EXTERN_C 30 31 typedef uint16_t deFloat16; 32 33 #if defined(DE_DEPRECATED_TYPES) 34 typedef deFloat16 DEfloat16; 35 #endif 36 37 /*--------------------------------------------------------------------*//*! 38 * \brief Convert 32-bit floating point number to 16 bit. 39 * \param val32 Input value. 40 * \return Converted 16-bit floating-point value. 41 *//*--------------------------------------------------------------------*/ 42 deFloat16 deFloat32To16(float val32); 43 deFloat16 deFloat32To16Round(float val32, deRoundingMode mode); 44 void deFloat16_selfTest(void); 45 46 deFloat16 deFloat64To16(double val64); 47 deFloat16 deFloat64To16Round(double val64, deRoundingMode mode); 48 49 /*--------------------------------------------------------------------*//*! 50 * \brief Convert 16-bit floating point number to 32 bit. 51 * \param val16 Input value. 52 * \return Converted 32-bit floating-point value. 53 *//*--------------------------------------------------------------------*/ 54 float deFloat16To32(deFloat16 val16); 55 56 /*--------------------------------------------------------------------*//*! 57 * \brief Convert 16-bit floating point number to 64 bit. 58 * \param val16 Input value. 59 * \return Converted 64-bit floating-point value. 60 *//*--------------------------------------------------------------------*/ 61 double deFloat16To64(deFloat16 val16); 62 deHalfExponent(deFloat16 x)63static inline uint16_t deHalfExponent(deFloat16 x) 64 { 65 return (uint16_t)((x & 0x7c00u) >> 10); 66 } 67 deHalfMantissa(deFloat16 x)68static inline uint16_t deHalfMantissa(deFloat16 x) 69 { 70 return (uint16_t)(x & 0x03ffu); 71 } 72 deHalfHighestMantissaBit(deFloat16 x)73static inline uint16_t deHalfHighestMantissaBit(deFloat16 x) 74 { 75 return (uint16_t)(x & (1u << 9)); 76 } 77 deHalfSign(deFloat16 x)78static inline uint16_t deHalfSign(deFloat16 x) 79 { 80 return (uint16_t)(x >> 15); 81 } 82 83 static const uint16_t deHalfMaxExponent = 0x1f; 84 deHalfIsZero(deFloat16 x)85static inline bool deHalfIsZero(deFloat16 x) 86 { 87 return deHalfExponent(x) == 0 && deHalfMantissa(x) == 0; 88 } 89 deHalfIsPositiveZero(deFloat16 x)90static inline bool deHalfIsPositiveZero(deFloat16 x) 91 { 92 return deHalfIsZero(x) && (deHalfSign(x) == 0); 93 } 94 deHalfIsNegativeZero(deFloat16 x)95static inline bool deHalfIsNegativeZero(deFloat16 x) 96 { 97 return deHalfIsZero(x) && (deHalfSign(x) != 0); 98 } 99 deHalfIsIEEENaN(deFloat16 x)100static inline bool deHalfIsIEEENaN(deFloat16 x) 101 { 102 return deHalfExponent(x) == deHalfMaxExponent && deHalfMantissa(x) != 0; 103 } 104 deHalfIsSignalingNaN(deFloat16 x)105static inline bool deHalfIsSignalingNaN(deFloat16 x) 106 { 107 return deHalfIsIEEENaN(x) && deHalfHighestMantissaBit(x) == 0; 108 } 109 deHalfIsQuietNaN(deFloat16 x)110static inline bool deHalfIsQuietNaN(deFloat16 x) 111 { 112 return deHalfIsIEEENaN(x) && deHalfHighestMantissaBit(x) != 0; 113 } 114 deHalfIsInf(deFloat16 x)115static inline bool deHalfIsInf(deFloat16 x) 116 { 117 return deHalfExponent(x) == deHalfMaxExponent && deHalfMantissa(x) == 0; 118 } 119 deHalfIsPositiveInf(deFloat16 x)120static inline bool deHalfIsPositiveInf(deFloat16 x) 121 { 122 return deHalfIsInf(x) && (deHalfSign(x) == 0); 123 } 124 deHalfIsNegativeInf(deFloat16 x)125static inline bool deHalfIsNegativeInf(deFloat16 x) 126 { 127 return deHalfIsInf(x) && (deHalfSign(x) != 0); 128 } 129 deHalfIsDenormal(deFloat16 x)130static inline bool deHalfIsDenormal(deFloat16 x) 131 { 132 return deHalfExponent(x) == 0 && deHalfMantissa(x) != 0; 133 } 134 135 DE_END_EXTERN_C 136 137 #endif /* _DEFLOAT16_H */ 138