diff options
author | sanine <sanine.not@pm.me> | 2022-03-04 10:47:15 -0600 |
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committer | sanine <sanine.not@pm.me> | 2022-03-04 10:47:15 -0600 |
commit | 058f98a63658dc1a2579826ba167fd61bed1e21f (patch) | |
tree | bcba07a1615a14d943f3af3f815a42f3be86b2f3 /src/mesh/assimp-master/include/assimp/qnan.h | |
parent | 2f8028ac9e0812cb6f3cbb08f0f419e4e717bd22 (diff) |
add assimp submodule
Diffstat (limited to 'src/mesh/assimp-master/include/assimp/qnan.h')
-rw-r--r-- | src/mesh/assimp-master/include/assimp/qnan.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/src/mesh/assimp-master/include/assimp/qnan.h b/src/mesh/assimp-master/include/assimp/qnan.h new file mode 100644 index 0000000..c64caba --- /dev/null +++ b/src/mesh/assimp-master/include/assimp/qnan.h @@ -0,0 +1,162 @@ +/* +--------------------------------------------------------------------------- +Open Asset Import Library (assimp) +--------------------------------------------------------------------------- + +Copyright (c) 2006-2022, assimp team + + + +All rights reserved. + +Redistribution and use of this software in source and binary forms, +with or without modification, are permitted provided that the following +conditions are met: + +* Redistributions of source code must retain the above + copyright notice, this list of conditions and the + following disclaimer. + +* Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the + following disclaimer in the documentation and/or other + materials provided with the distribution. + +* Neither the name of the assimp team, nor the names of its + contributors may be used to endorse or promote products + derived from this software without specific prior + written permission of the assimp team. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +--------------------------------------------------------------------------- +*/ + +/** @file qnan.h + * @brief Some utilities for our dealings with qnans. + * + * @note Some loaders use qnans to mark invalid values tempoarily, also + * Assimp explicitly enforces undefined normals to be set to qnan. + * qnan utilities are available in standard libraries (C99 for example) + * but last time I checked compiler coverage was so bad that I decided + * to reinvent the wheel. + */ +#pragma once +#ifndef AI_QNAN_H_INCLUDED +#define AI_QNAN_H_INCLUDED + +#ifdef __GNUC__ +# pragma GCC system_header +#endif + +#include <assimp/defs.h> + +#include <limits> +#include <stdint.h> + +// --------------------------------------------------------------------------- +/** Data structure to represent the bit pattern of a 32 Bit + * IEEE 754 floating-point number. */ +union _IEEESingle { + float Float; + struct + { + uint32_t Frac : 23; + uint32_t Exp : 8; + uint32_t Sign : 1; + } IEEE; +}; + +// --------------------------------------------------------------------------- +/** Data structure to represent the bit pattern of a 64 Bit + * IEEE 754 floating-point number. */ +union _IEEEDouble { + double Double; + struct + { + uint64_t Frac : 52; + uint64_t Exp : 11; + uint64_t Sign : 1; + } IEEE; +}; + +// --------------------------------------------------------------------------- +/** Check whether a given float is qNaN. + * @param in Input value */ +AI_FORCE_INLINE bool is_qnan(float in) { + // the straightforward solution does not work: + // return (in != in); + // compiler generates code like this + // load <in> to <register-with-different-width> + // compare <register-with-different-width> against <in> + + // FIXME: Use <float> stuff instead? I think fpclassify needs C99 + _IEEESingle temp; + memcpy(&temp, &in, sizeof(float)); + return (temp.IEEE.Exp == (1u << 8)-1 && + temp.IEEE.Frac); +} + +// --------------------------------------------------------------------------- +/** Check whether a given double is qNaN. + * @param in Input value */ +AI_FORCE_INLINE bool is_qnan(double in) { + // the straightforward solution does not work: + // return (in != in); + // compiler generates code like this + // load <in> to <register-with-different-width> + // compare <register-with-different-width> against <in> + + // FIXME: Use <float> stuff instead? I think fpclassify needs C99 + _IEEEDouble temp; + memcpy(&temp, &in, sizeof(in)); + return (temp.IEEE.Exp == (1u << 11)-1 && + temp.IEEE.Frac); +} + +// --------------------------------------------------------------------------- +/** @brief check whether a float is either NaN or (+/-) INF. + * + * Denorms return false, they're treated like normal values. + * @param in Input value */ +AI_FORCE_INLINE bool is_special_float(float in) { + _IEEESingle temp; + memcpy(&temp, &in, sizeof(float)); + return (temp.IEEE.Exp == (1u << 8)-1); +} + +// --------------------------------------------------------------------------- +/** @brief check whether a double is either NaN or (+/-) INF. + * + * Denorms return false, they're treated like normal values. + * @param in Input value */ +AI_FORCE_INLINE bool is_special_float(double in) { + _IEEESingle temp; + memcpy(&temp, &in, sizeof(float)); + return (temp.IEEE.Exp == (1u << 11)-1); +} + +// --------------------------------------------------------------------------- +/** Check whether a float is NOT qNaN. + * @param in Input value */ +template<class TReal> +AI_FORCE_INLINE bool is_not_qnan(TReal in) { + return !is_qnan(in); +} + +// --------------------------------------------------------------------------- +/** @brief Get a fresh qnan. */ +AI_FORCE_INLINE ai_real get_qnan() { + return std::numeric_limits<ai_real>::quiet_NaN(); +} + +#endif // !! AI_QNAN_H_INCLUDED |