139 lines
4.2 KiB
C++
139 lines
4.2 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2015 Mario Luzeiro <mrluzeiro@ua.pt>
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* Copyright (C) 1992-2015 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/**
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* @file 3d_fastmath.h
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* @brief Defines math related functions
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*/
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#ifndef _3D_FASTMATH_H
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#define _3D_FASTMATH_H
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#include <string.h>
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#include <stdint.h>
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#include <cmath>
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// Define this flag to use fast math optimizations
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#define FASTMATH_USE
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#define L1_CACHE_LINE_SIZE 64
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#ifdef FASTMATH_USE
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#define INTFLOORF(s) (lrintf( (s) - (0.5f - FLT_EPSILON) ))
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#else
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#define INTFLOORF(s) ((int)( floor(s) ))
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#endif
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/**
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* This part contains some functions from the PBRT 3 source code.
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* https://github.com/mmp/pbrt-v3/blob/master/src/core/pbrt.h
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*/
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/*
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pbrt source code is Copyright(c) 1998-2015
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Matt Pharr, Greg Humphreys, and Wenzel Jakob.
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This file is part of pbrt.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// Global Inline Functions
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inline uint32_t FloatToBits(float f) {
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uint32_t ui;
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memcpy(&ui, &f, sizeof(float));
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return ui;
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}
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inline float BitsToFloat(uint32_t ui) {
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float f;
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memcpy(&f, &ui, sizeof(uint32_t));
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return f;
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}
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inline uint64_t FloatToBits(double f) {
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uint64_t ui;
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memcpy(&ui, &f, sizeof(double));
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return ui;
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}
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inline double BitsToFloat(uint64_t ui) {
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double f;
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memcpy(&f, &ui, sizeof(uint64_t));
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return f;
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}
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inline float NextFloatUp(float v) {
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// Handle infinity and negative zero for _NextFloatUp()_
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if (std::isinf(v) && v > 0.) return v;
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if (v == -0.f) v = 0.f;
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// Advance _v_ to next higher float
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uint32_t ui = FloatToBits(v);
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if (v >= 0.)
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++ui;
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else
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--ui;
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return BitsToFloat(ui);
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}
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inline float NextFloatDown(float v) {
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// Handle infinity and positive zero for _NextFloatDown()_
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if (std::isinf(v) && v < 0.) return v;
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if (v == 0.f) v = -0.f;
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uint32_t ui = FloatToBits(v);
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if (v > 0.)
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--ui;
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else
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++ui;
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return BitsToFloat(ui);
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}
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#endif // 3D_FASTMATH_H
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