1 | // This file is a part of Framsticks SDK. http://www.framsticks.com/ |
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2 | // Copyright (C) 1999-2024 Maciej Komosinski and Szymon Ulatowski. |
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3 | // See LICENSE.txt for details. |
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4 | |
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5 | #ifndef _NONSTD_MATH_H_ |
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6 | #define _NONSTD_MATH_H_ |
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7 | |
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8 | |
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9 | #ifdef _MSC_VER |
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10 | #define _USE_MATH_DEFINES //after this is defined, the next #include <math.h> or <cmath> will define M_PI etc. |
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11 | #include <math.h> //in vc2008, <cmath> worked here, but no longer in vc2010 because "something" (some other .h from stl?) earlier includes <cmath> without _USE_MATH_DEFINES, and <cmath> includes <math.h> (just once because it has "include guards" like any other .h) |
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12 | #include <float.h> |
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13 | //#define isnan(x) _isnan(x) //since 2014 we use std::isnan() |
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14 | #define finite(x) _finite(x) |
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15 | #else //e.g. __BORLANDC__ |
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16 | #include <math.h> |
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17 | #endif |
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18 | |
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19 | |
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20 | |
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21 | //random number generator: |
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22 | #include "random.h" |
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23 | RandomGenerator &rndGetInstance(); |
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24 | |
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25 | inline double rndDouble(double limit_exclusive) { return rndGetInstance().getDouble() * limit_exclusive; } |
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26 | inline unsigned int rndUint(unsigned int limit_exclusive) { return (unsigned int)(rndGetInstance().getDouble() * limit_exclusive); } //returns random from 0..limit_exclusive-1 |
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27 | inline unsigned int rndUint(size_t limit_exclusive) {return rndUint((unsigned int)limit_exclusive);} //just an overload with size_t argument |
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28 | unsigned int rndUint(int limit_exclusive); //just an overload with int argument |
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29 | inline void rndSetSeed(unsigned int seed) { rndGetInstance().setSeed(seed); } |
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30 | inline unsigned int rndRandomizeSeed() { return rndGetInstance().randomize(); } |
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31 | |
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32 | |
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33 | |
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34 | // precision==-1 for full precision, or positive values for the number of digits to print past the decimal point. |
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35 | // Allocated buffer with bufferlen=30 is OK. |
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36 | // Returns the number of chars actually used (not including the ending 0). |
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37 | int doubleToString(double x, int precision, char *buffer, int bufferlen); |
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38 | |
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39 | #include <string> |
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40 | std::string doubleToString(double x, int precision); |
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41 | double round(const double x, const int precision); |
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42 | static inline void clipNegativeZeroIfNeeded(double& value, const double range_low) |
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43 | { |
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44 | if (value == 0.0 && range_low == 0.0) // if we have range_low==0.0 and we get value==-0.0 (which is ==0.0) |
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45 | value = 0.0; //turn -0.0 to 0.0 so that it does not look like exceeding the allowed range (even though -0.0==0.0). This code unnecessarily also "overwrites" value==0.0 with 0.0, but it is faster and simpler than additionally checking std::signbit(value) just to distinguish -0.0 from 0.0. |
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46 | //these conditions are not intended for range_low==-0.0, as we assume nobody would define allowed ranges using -0.0. |
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47 | } |
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48 | |
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49 | |
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50 | |
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51 | |
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52 | |
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53 | //floating point specific numbers |
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54 | #include "stdlib.h" |
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55 | |
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56 | #ifdef __BORLANDC__ |
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57 | #include <float.h> |
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58 | #define isnan(x) _isnan(x) //http://stackoverflow.com/questions/570669/checking-if-a-double-or-float-is-nan-in-c |
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59 | #define finite(x) _finite(x) |
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60 | #endif |
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61 | |
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62 | #ifdef LINUX |
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63 | #define _isnan(a) isnan(a) |
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64 | #endif |
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65 | |
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66 | #ifdef IPHONE |
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67 | #define finite(x) (!isinf(x)) |
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68 | #define _isnan(a) isnan(a) |
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69 | #endif |
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70 | |
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71 | |
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72 | #if defined SHP |
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73 | //#define __assert_func(a,b,c,d) 0 //Currently, we are sorry to inform you that assert() is not yet supported. We have considered your request for internal discussion. Na szcz�cie jest w�asna (byle by by�a, bo i tak zak�adamy ze assert ktore przeciez dziala tylko w trybie debug nie jest potrzebne na bada) implementacja w "bada-assert.cpp" |
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74 | #define isnan(x) false //isnan() sie nie linkuje |
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75 | #define finite(x) true //j.w. |
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76 | //#include <cstdlib> //RAND_MAX defined incorrectly |
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77 | //#ifdef BADA_SIMULATOR //...but only in simulator libs |
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78 | // #undef RAND_MAX |
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79 | // #define RAND_MAX 32768 //...this is the actual value used by rand() |
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80 | //#endif |
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81 | #endif |
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82 | |
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83 | #if defined LINUX || defined TIZEN || defined __ANDROID__ |
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84 | #include <fenv.h> |
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85 | #endif |
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86 | |
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87 | namespace fpExcept |
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88 | { |
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89 | //handling floating point exceptions |
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90 | #if defined LINUX || defined TIZEN || defined __ANDROID__ |
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91 | //fenv.h values |
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92 | static constexpr unsigned int FPEX_DIV0 = FE_DIVBYZERO; |
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93 | static constexpr unsigned int FPEX_INVALID = FE_INVALID; |
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94 | static constexpr unsigned int FPEX_OVERFLOW = FE_OVERFLOW; |
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95 | #elif defined IPHONE |
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96 | // (not implemented but these constants are still needed) |
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97 | static constexpr unsigned int FPEX_DIV0 = 0; |
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98 | static constexpr unsigned int FPEX_INVALID = 0; |
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99 | static constexpr unsigned int FPEX_OVERFLOW = 0; |
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100 | #else |
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101 | //_control87() values |
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102 | static constexpr unsigned int FPEX_DIV0 = EM_ZERODIVIDE; |
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103 | static constexpr unsigned int FPEX_INVALID = EM_INVALID; |
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104 | static constexpr unsigned int FPEX_OVERFLOW = EM_OVERFLOW; |
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105 | #endif |
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106 | extern int wanted_exceptions; |
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107 | |
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108 | void init(); //call once, before ...Enable/Disable |
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109 | void enable(); |
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110 | void disable(); |
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111 | }; |
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112 | |
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113 | // std::lerp can be used since C++20 (and has some guaranteed properties probably better than this basic formula) but apparently it is not a template |
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114 | template <typename Value, typename Linear> Value universal_lerp(Value a,Value b,Linear t) {return a*(1-t)+b*t;} |
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115 | |
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116 | template <typename T> T linearTransform(T value, T min_in, T max_in, T min_out, T max_out) |
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117 | { |
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118 | return min_out + (value-min_in)*(max_out-min_out)/(max_in-min_in); |
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119 | } |
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120 | |
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121 | //in C++20, related: https://en.cppreference.com/w/cpp/numeric/countl_zero |
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122 | #ifdef _WIN32 //visual studio is missing ffs() |
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123 | static inline unsigned ffs(int x) |
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124 | { |
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125 | if (x == 0) return 0u; |
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126 | unsigned r = 1; |
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127 | while ((x & 1) == 0) |
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128 | x >>= 1, ++r; |
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129 | return r; |
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130 | } |
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131 | #endif |
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132 | |
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133 | |
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134 | #endif |
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