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annotate engine/core/util/math/fife_math.h @ 623:684e5537eef7

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* Moving the math constants to the FIFE namespace * Added swig interfaces for the math constants
author prock@33b003aa-7bff-0310-803a-e67f0ece8222
date Fri, 01 Oct 2010 16:26:22 +0000
parents 356634098bd9
children 07b1cf8e92b5
rev   line source
0
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1 /***************************************************************************
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2 * Copyright (C) 2005-2010 by the FIFE team *
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3 * http://www.fifengine.net *
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4 * This file is part of FIFE. *
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5 * *
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6 * FIFE is free software; you can redistribute it and/or *
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7 * modify it under the terms of the GNU Lesser General Public *
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8 * License as published by the Free Software Foundation; either *
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9 * version 2.1 of the License, or (at your option) any later version. *
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10 * *
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11 * This library is distributed in the hope that it will be useful, *
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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14 * Lesser General Public License for more details. *
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15 * *
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16 * You should have received a copy of the GNU Lesser General Public *
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17 * License along with this library; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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20 ***************************************************************************/
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21
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22 #ifndef FIFE_UTIL_FIFE_MATH_H
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23 #define FIFE_UTIL_FIFE_MATH_H
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24
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25 // Standard C++ library includes
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26 #include <cmath>
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27
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28 // Platform specific includes
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29
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30 // 3rd party library includes
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31
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32 // FIFE includes
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33 // These includes are split up in two parts, separated by one empty line
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34 // First block: files included from the FIFE root src directory
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35 // Second block: files included from the same folder
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36
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37 #ifndef ABS
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38 #define ABS(x) ((x)<0?-(x):(x))
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39
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40 #endif
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41
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42 // Sort out the missing round function in MSVC:
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43 #if defined( WIN32 ) && defined( _MSC_VER )
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44 inline double round(const double x) {
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45 return x < 0.0 ? ceil(x - 0.5) : floor(x + 0.5);
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46 }
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47 #endif
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48
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49 namespace FIFE {
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50
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51 static const float FLT_ZERO_TOLERANCE = 1e-06f;
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52 static const float FLT_PI = 4.0f*std::atan(1.0f);
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53 static const float FLT_TWO_PI = 2.0f*FLT_PI;
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54 static const float FLT_HALF_PI = 0.5f*FLT_PI;
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55 static const float FLT_INVERSE_PI = 1.0f/FLT_PI;
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56 static const float FLT_INVERSE_TWO_PI = 1.0f/FLT_TWO_PI;
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57 static const float FLT_DEG_TO_RAD = FLT_PI/180.0f;
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58 static const float FLT_RAD_TO_DEG = 180.0f/FLT_PI;
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59 static const float FLT_LOG_2 = std::log(2.0f);
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60 static const float FLT_LOG_10 = std::log(10.0f);
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61 static const float FLT_INV_LOG_2 = 1.0f/std::log(2.0f);
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62 static const float FLT_INV_LOG_10 = 1.0f/std::log(10.0f);
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63
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64 static const double DBL_ZERO_TOLERANCE = 1e-08;
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65 static const double DBL_PI = 4.0*std::atan(1.0f);
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66 static const double DBL_TWO_PI = 2.0*DBL_PI;
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67 static const double DBL_HALF_PI = 0.5*DBL_PI;
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68 static const double DBL_INVERSE_PI = 1.0/DBL_PI;
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69 static const double DBL_INVERSE_TWO_PI = 1.0/DBL_TWO_PI;
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70 static const double DBL_DEG_TO_RAD = DBL_PI/180.0;
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71 static const double DBL_RAD_TO_DEG = 180.0/DBL_PI;
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72 static const double DBL_LOG_2 = std::log(2.0f);
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73 static const double DBL_LOG_10 = std::log(10.0f);
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74 static const double DBL_INV_LOG_2 = 1.0/std::log(2.0f);
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75 static const double DBL_INV_LOG_10 = 1.0/std::log(10.0f);
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76
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77 inline unsigned nextPow2(unsigned x)
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78 {
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79 --x;
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80 x |= x >> 1;
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81 x |= x >> 2;
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82 x |= x >> 4;
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83 x |= x >> 8;
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84 x |= x >> 16;
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85 return ++x;
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86 }
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87 } //FIFE
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88
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89 #endif // FIFE_UTIL_FIFE_MATH_H