Mercurial > mm7

annotate Math.h @ 1291:1577d75db258

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author Ritor1
date Fri, 14 Jun 2013 16:06:20 +0600
parents 0d6c7ff3cddd
children 0aeac0b9ca30
rev   line source
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1 #pragma once
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2 #include <cassert>
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3 #include <limits>
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4 #include <float.h>
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6
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7 /* 186 */
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8 #pragma pack(push, 1)
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9 struct stru193_math
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10 {
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11 stru193_math();
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12 int Cos(int angle);
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13 unsigned int Atan2(int x, int y);
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14 int Sin(int angle);
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15
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16 int pTanTable[520];
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17 int pCosTable[520];
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18 int pInvCosTable[520];
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19 static const unsigned int uIntegerPi = 1024;
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20 static const unsigned int uIntegerHalfPi = 512;
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21 static const unsigned int uIntegerDoublePi = 2048;
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22 static const unsigned int uDoublePiMask = 2047;
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23 static const unsigned int uPiMask = 1023;
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24 static const unsigned int uHalfPiMask = 511;
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25 };
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26 #pragma pack(pop)
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27
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28
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29 int fixpoint_sub0(int, int);
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30 int fixpoint_div(int, int);
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31 int fixpoint_mul(int, int);
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32 int fixpoint_from_float(float value);
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33
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34 #ifndef ROUNDING_EPSILON
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35 #define ROUNDING_EPSILON 0.0000001
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36 #endif
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37
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38 #include <cmath>
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39 #include <cstdlib>
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40 #include <ciso646>
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41
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42 template <typename FloatType>
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43 int bankersRounding(
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44 const FloatType& value
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45 ) {
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46 assert("Method unsupported for this type" && false);
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47 return value;
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48 }
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49
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50 template<> static int bankersRounding<float>(const float& inValue)
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51 {
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52 union Cast
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53 {
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54 double d;
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55 long l;
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56 };
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57 volatile Cast c;
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58 c.d = inValue + 6755399441055744.0;
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59 return c.l;
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60 }
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61
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62 #pragma push_macro("max")
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63 #undef max
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64
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65 template<> static int bankersRounding<double>(const double& inValue)
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66 {
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67 double maxValue = std::numeric_limits<int>::max();
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68 assert(maxValue - 6755399441055744.0 >= inValue);
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69 union Cast
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70 {
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71 double d;
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72 long l;
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73 };
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74 volatile Cast c;
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75 c.d = inValue + 6755399441055744.0;
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76 return c.l;
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77 }
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78
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79
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80 #pragma pop_macro("max")
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81
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82 extern struct stru193_math *stru_5C6E00;