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1 #include <math.h>
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2
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3 #include "Random.h"
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4
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5 #include "mm7_data.h"
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6
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7
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8
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9
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10 struct Random *pRnd; // idb
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11
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12
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13
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14
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15
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16 //----- (004BE59E) --------------------------------------------------------
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17 void Random::SetRange(int min, int max)
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18 {
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19 this->min = min;
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20 this->range = max - min;
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21 }
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22
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23 //----- (004BE5B1) --------------------------------------------------------
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24 double Random::GetRandom()
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25 {
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26 Random *v1; // esi@1
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27 double v2; // st7@1
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28 double v3; // st7@1
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29
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30 v1 = this;
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31 this->field_0[3] = this->field_0[2];
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32 this->field_0[2] = this->field_0[1];
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33 v2 = this->field_0[0];
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34 this->field_0[1] = v2;
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35 v3 = this->field_0[3] * 1492.0
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36 + this->field_0[2] * 1776.0
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37 + this->field_0[3] * 2111111111.0
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38 + v2 * 5115.0
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39 + this->field_0[4];
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40 v1->field_0[0] = v3 - floor(v3);
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41 v1->field_0[4] = v3 * 2.328306436538696e-10;
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42 return v3 - v3;
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43 }
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44
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45 //----- (004BE623) --------------------------------------------------------
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46 int Random::GetInRange()
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47 {
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48 Random *v1; // esi@1
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49 float v2; // ST10_4@1
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50 double v3; // ST04_8@1
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51 int floored_random; // ecx@1
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52
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53 v1 = this;
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54 v2 = GetRandom() * (double)this->range;
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55 v3 = v2 + 6.7553994e15;
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56 floored_random = LODWORD(v3);
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57 if ( SLODWORD(v3) >= v1->range )
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58 floored_random = v1->range;
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59 return floored_random + v1->min;
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60 }
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61
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62 //----- (004BE65D) --------------------------------------------------------
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63 void Random::Initialize(int seed)
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64 {
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65 int v2; // eax@1
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66 Random *this_; // esi@1
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67 signed int v4; // ecx@3
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68 unsigned int v5; // eax@4
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69 signed int v6; // edi@5
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70
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71 v2 = seed;
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72 this_ = this;
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73 if ( !seed )
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74 v2 = -1;
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75 v4 = 0;
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76 do
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77 {
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78 v5 = (((v2 << 13) ^ (unsigned int)v2) >> 17) ^ (v2 << 13) ^ v2;
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79 v2 = 32 * v5 ^ v5;
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80 this_->field_0[v4++] = (double)(unsigned int)v2 * 2.328306436538696e-10;
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81 }
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82 while ( v4 < 5 );
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83 v6 = 19;
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84 do
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85 {
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86 GetRandom();
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87 --v6;
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88 }
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89 while ( v6 );
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90 }
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91
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