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1 /*
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2 ---------------------------------------------------------------------------
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3 Open Asset Import Library (assimp)
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4 ---------------------------------------------------------------------------
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5
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6 Copyright (c) 2006-2012, assimp team
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7
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8 All rights reserved.
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9
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10 Redistribution and use of this software in source and binary forms,
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11 with or without modification, are permitted provided that the following
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12 conditions are met:
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13
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14 * Redistributions of source code must retain the above
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15 copyright notice, this list of conditions and the
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16 following disclaimer.
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17
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18 * Redistributions in binary form must reproduce the above
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19 copyright notice, this list of conditions and the
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20 following disclaimer in the documentation and/or other
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21 materials provided with the distribution.
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22
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23 * Neither the name of the assimp team, nor the names of its
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24 contributors may be used to endorse or promote products
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25 derived from this software without specific prior
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26 written permission of the assimp team.
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27
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28 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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29 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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30 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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31 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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32 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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33 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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34 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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35 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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36 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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37 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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38 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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39 ---------------------------------------------------------------------------
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40 */
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41
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42 /** @file qnan.h
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43 * @brief Some utilities for our dealings with qnans.
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44 *
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45 * @note Some loaders use qnans to mark invalid values tempoarily, also
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46 * Assimp explicitly enforces undefined normals to be set to qnan.
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47 * qnan utilities are available in standard libraries (C99 for example)
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48 * but last time I checked compiler coverage was so bad that I decided
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49 * to reinvent the wheel.
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50 */
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51
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52 #ifndef AI_QNAN_H_INCLUDED
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53 #define AI_QNAN_H_INCLUDED
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54
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55 // ---------------------------------------------------------------------------
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56 /** Data structure to represent the bit pattern of a 32 Bit
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57 * IEEE 754 floating-point number. */
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58 union _IEEESingle
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59 {
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60 float Float;
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61 struct
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62 {
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63 uint32_t Frac : 23;
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64 uint32_t Exp : 8;
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65 uint32_t Sign : 1;
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66 } IEEE;
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67 } ;
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68
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69 // ---------------------------------------------------------------------------
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70 /** Check whether a given float is qNaN.
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71 * @param in Input value */
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72 AI_FORCE_INLINE bool is_qnan(float in)
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73 {
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74 // the straightforward solution does not work:
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75 // return (in != in);
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76 // compiler generates code like this
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77 // load <in> to <register-with-different-width>
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78 // compare <register-with-different-width> against <in>
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79
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80 // FIXME: Use <float> stuff instead? I think fpclassify needs C99
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81 return (reinterpret_cast<_IEEESingle*>(&in)->IEEE.Exp == (1u << 8)-1 &&
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82 reinterpret_cast<_IEEESingle*>(&in)->IEEE.Frac);
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83 }
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84
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85 // ---------------------------------------------------------------------------
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86 /** Check whether a float is NOT qNaN.
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87 * @param in Input value */
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88 AI_FORCE_INLINE bool is_not_qnan(float in)
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89 {
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90 return !is_qnan(in);
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91 }
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92
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93 // ---------------------------------------------------------------------------
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94 /** @brief check whether a float is either NaN or (+/-) INF.
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95 *
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96 * Denorms return false, they're treated like normal values.
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97 * @param in Input value */
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98 AI_FORCE_INLINE bool is_special_float(float in)
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99 {
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100 return (reinterpret_cast<_IEEESingle*>(&in)->IEEE.Exp == (1u << 8)-1);
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101 }
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102
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103 // ---------------------------------------------------------------------------
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104 /** @brief Get a fresh qnan. */
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105 AI_FORCE_INLINE float get_qnan()
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106 {
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107 return std::numeric_limits<float>::quiet_NaN();
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108 }
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109
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110 #endif // !! AI_QNAN_H_INCLUDED
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