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2499
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1 #define _CRTDBG_MAP_ALLOC
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2 #include <stdlib.h>
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3 #include <crtdbg.h>
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4
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5 #include "OurMath.h"
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6 #include "MM7_data.h"
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7
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8 //----- (00452969) --------------------------------------------------------
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9 stru193_math::stru193_math()
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10 {
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11 double v3; // ST18_8@2
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12
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13 this->pTanTable[0] = 0;
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14 this->pCosTable[0] = 65536;
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15 this->pInvCosTable[0] = 65536;
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16 for(int i = 1; i < (signed int)this->uIntegerHalfPi; i++)
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17 {
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2534
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18 v3 = (double)i * pi_double / (double)uIntegerPi;
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2499
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19 pTanTable[i] = (signed __int64)(tan(v3) * (double)this->pCosTable[0] + 0.5);
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20 pCosTable[i] = (signed __int64)(cos(v3) * (double)this->pCosTable[0] + 0.5);
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21 pInvCosTable[i] = (signed __int64)(1.0 / cos(v3) * (double)this->pCosTable[0] + 0.5);
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22 }
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23 for(int i = this->uIntegerHalfPi; i < 520; i++)
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24 {
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25 this->pTanTable[i] = 0xEFFFFFFFu;
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26 this->pCosTable[i] = 0;
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27 this->pInvCosTable[i] = 0xEFFFFFFFu;
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28 }
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29 }
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30
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31
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32 //----- (00402CAE) --------------------------------------------------------
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33 int stru193_math::Cos(int angle)
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34 {
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35 int v2; // eax@1
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36
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37 //a2: (angle - uIntegerHalfPi) for sin(angle)
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38 // (angle) for cos(angle)
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39
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40 v2 = uDoublePiMask & angle;
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41
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42 if ( v2 > uIntegerPi )
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43 v2 = uIntegerDoublePi - v2;
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44 if ( v2 >= uIntegerHalfPi )
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45 return -pCosTable[uIntegerPi - v2];
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46 else
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47 return pCosTable[v2];
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48 }
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49
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50
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51 //----- (0045281E) --------------------------------------------------------
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52 // Calculates atan2(y/x)
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53 // return value: angle in integer format (multiplier of Pi/1024)
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54 unsigned int stru193_math::Atan2(int x, int y)
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55 {
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56 signed int quadrant;
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57 __int64 dividend;
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58 int quotient;
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59 int lowIdx;
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60 int highIdx;
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61 int angle;
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62
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63 int X = x;
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64 int Y = y;
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65
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66 if ( abs(X) < 65536 )
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67 {
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68 if ( (abs(Y) >> 15) >= abs(X) )
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69 X = 0;
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70 }
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71
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72 if ( !X )
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73 {
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74 if ( Y > 0 )
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75 {
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76 return uIntegerHalfPi; //Pi/2
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77 }
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78 else
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79 {
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80 return uIntegerHalfPi + uIntegerPi; //3*(Pi/2)
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81 }
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82 }
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83
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84 if ( Y )
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85 {
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86 if ( X < 0 )
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87 {
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88 X = -X;
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89 if ( Y > 0 )
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90 {
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91 quadrant = 4;
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92 }
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93 else
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94 {
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95 quadrant = 3;
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96 }
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97 }
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98 else
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99 {
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100 if ( Y > 0 )
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101 {
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102 quadrant = 1;
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103 }
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104 else
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105 {
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106 quadrant = 2;
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107 }
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108 }
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109
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110 if ( Y < 0 )
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111 Y = -Y;
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112
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113 LODWORD(dividend) = Y << 16;
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114 HIDWORD(dividend) = Y >> 16;
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115 quotient = dividend / X;
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116
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117 //looks like binary search
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118 {
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119 int i;
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120 highIdx = uIntegerHalfPi;
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121 lowIdx = 0;
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122
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123 for (i = 0; i < 6; ++i)
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124 {
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125 if (quotient <= pTanTable[(lowIdx + highIdx) / 2])
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126 highIdx = (lowIdx + highIdx) / 2;
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127 else
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128 lowIdx = (lowIdx + highIdx) / 2;
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129 }
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130 }
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131
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132 angle = lowIdx + 1;
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133 while ( angle < (highIdx - 1) && quotient >= pTanTable[angle] )
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134 ++angle;
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135
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136 switch (quadrant)
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137 {
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138 case 1: //X > 0, Y > 0
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139 return angle;
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140
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141 case 2: //X > 0, Y < 0
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142 return uIntegerDoublePi - angle; //2*Pi - angle
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143
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144 case 3: //X > 0, Y < 0
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145 return uIntegerPi + angle; //Pi + angle
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146
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147 case 4: //X < 0, Y > 0
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148 return uIntegerPi - angle; //Pi - angle
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149 }
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150
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151 //should newer get here
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152 return 0;
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153 }
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154
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155 if ( X < 0 ) //Y == 0, X < 0
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156 return uIntegerPi;
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157
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158 return 0;
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159 }
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160
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161 //----- (0042EBDB) --------------------------------------------------------
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162 int stru193_math::Sin(int angle)
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163 {
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164 return Cos(angle - this->uIntegerHalfPi);
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165 }
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166
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167 //----- (0042EBBE) --------------------------------------------------------
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168 //----- (004453C0) mm6-----------------------------------------------------
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169 //----- (004A1760) mm6_chinese---------------------------------------------
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170 __int64 fixpoint_mul(int a1, int a2)
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171 {
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172 return ((__int64)a1 * (__int64)a2) >> 16;
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173 }
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174
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175 __int64 fixpoint_dot(int x1, int x2, int y1, int y2, int z1, int z2)
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176 {
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177 return fixpoint_mul(x1, x2) +
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178 fixpoint_mul(y1, y2) +
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179 fixpoint_mul(z1, z2);
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180 }
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181
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182 //----- (004A1780) mm6_chinese---------------------------------------------
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183 __int64 fixpoint_div(int a1, int a2)
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184 {
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185 return ((__int64)a1 << 16) / a2;
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186 }
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187
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188 __int64 fixpoint_sub_unknown(int a1, int a2)
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189 {
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190 return (((__int64)a1 << 16) * a2) >> 16;
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191 }
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192
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193 //----- (0048B561) --------------------------------------------------------
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194 int fixpoint_from_float(float val)
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195 {
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196 // float X.Yf -> int XXXX YYYY
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197 int left = floorf((val - 0.5f) + 0.5f);
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198 int right = floorf((val - left) * 65536.0f);
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199 return (left << 16) | right;
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200 }
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201
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202 int fixpoint_from_int(int lhv, int rhv)
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203 {
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204 return (lhv << 16) | rhv;
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205 }
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206
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207
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208 //----- (00452A9E) --------------------------------------------------------
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209 int integer_sqrt(int val)
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210 {
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211 ///////////////////////////////
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212 //Получение квадратного корня//
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213 ///////////////////////////////
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214
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215 signed int result; // eax@2
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216 unsigned int v2; // edx@3
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217 unsigned int v3; // edi@3
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218 int v5; // esi@4
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219
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220 if (val < 1)
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221 return val;
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222
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223 v2 = 0;
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224 v3 = val;
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225 result = 0;
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226 for (uint i = 0; i < 16; ++i)
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227 {
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228 result *= 2;
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229 v2 = (v3 >> 30) | 4 * v2;
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230 v5 = 2 * result + 1;
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231 v3 *= 4;
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232 if ( v2 >= v5 )
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233 {
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234 ++result;
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235 v2 -= v5;
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236 }
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237 }
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238 if ( val - result * result >= (unsigned int)(result - 1) )
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239 ++result;
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240 return result;
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241 }
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242
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243 //----- (00452B2E) --------------------------------------------------------
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244 int __fastcall GetDiceResult(unsigned int uNumDice, unsigned int uDiceSides)
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245 {
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246 int v3; // esi@1
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247
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248 v3 = 0;
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249 if ( uDiceSides )
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250 {
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251 for ( uint i = 0; i < uNumDice; ++i)
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252 v3 += rand() % uDiceSides + 1;
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253 return v3;
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254 }
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255 return 0;
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256 }
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