Mercurial > mm7

annotate OurMath.cpp @ 2345:182effc4b0ee

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for MultimediaPlayer
author Ritor1
date Mon, 07 Apr 2014 19:15:13 +0600
parents 9551756f46c4
children dc822157c98d
rev   line source
2331
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1 #include "OurMath.h"
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2 #include "MM7_data.h"
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3
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4 //----- (00452969) --------------------------------------------------------
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5 stru193_math::stru193_math()
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6 {
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7 double v3; // ST18_8@2
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8
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9 this->pTanTable[0] = 0;
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10 this->pCosTable[0] = 65536;
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11 this->pInvCosTable[0] = 65536;
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12 for(int i = 1; i < (signed int)this->uIntegerHalfPi; i++)
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13 {
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14 v3 = (double)i * 3.141592653589793 / (double)uIntegerPi;
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15 pTanTable[i] = (signed __int64)(tan(v3) * (double)this->pCosTable[0] + 0.5);
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16 pCosTable[i] = (signed __int64)(cos(v3) * (double)this->pCosTable[0] + 0.5);
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17 pInvCosTable[i] = (signed __int64)(1.0 / cos(v3) * (double)this->pCosTable[0] + 0.5);
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18 }
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19 for(int i = this->uIntegerHalfPi; i < 520; i++)
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20 {
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21 this->pTanTable[i] = 0xEFFFFFFFu;
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22 this->pCosTable[i] = 0;
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23 this->pInvCosTable[i] = 0xEFFFFFFFu;
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24 }
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25 }
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26
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27
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28 //----- (00402CAE) --------------------------------------------------------
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29 int stru193_math::Cos(int angle)
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30 {
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31 int v2; // eax@1
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32
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33 //a2: (angle - uIntegerHalfPi) for sin(angle)
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34 // (angle) for cos(angle)
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35
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36 v2 = uDoublePiMask & angle;
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37
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38 if ( v2 > uIntegerPi )
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39 v2 = uIntegerDoublePi - v2;
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40 if ( v2 >= uIntegerHalfPi )
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41 return -pCosTable[uIntegerPi - v2];
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42 else
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43 return pCosTable[v2];
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44 }
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45
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46
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47 //----- (0045281E) --------------------------------------------------------
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48 // Calculates atan2(y/x)
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49 // return value: angle in integer format (multiplier of Pi/1024)
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50 unsigned int stru193_math::Atan2(int x, int y)
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51 {
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52 signed int quadrant;
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53 __int64 dividend;
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54 int quotient;
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55 int lowIdx;
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56 int highIdx;
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57 int angle;
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58
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59 int X = x;
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60 int Y = y;
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61
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62 if ( abs(X) < 65536 )
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63 {
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64 if ( (abs(Y) >> 15) >= abs(X) )
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65 X = 0;
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66 }
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67
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68 if ( !X )
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69 {
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70 if ( Y > 0 )
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71 {
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72 return uIntegerHalfPi; //Pi/2
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73 }
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74 else
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75 {
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76 return uIntegerHalfPi + uIntegerPi; //3*(Pi/2)
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77 }
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78 }
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79
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80 if ( Y )
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81 {
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82 if ( X < 0 )
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83 {
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84 X = -X;
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85 if ( Y > 0 )
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86 {
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87 quadrant = 4;
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88 }
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89 else
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90 {
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91 quadrant = 3;
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92 }
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93 }
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94 else
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95 {
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96 if ( Y > 0 )
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97 {
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98 quadrant = 1;
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99 }
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100 else
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101 {
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102 quadrant = 2;
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103 }
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104 }
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105
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106 if ( Y < 0 )
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107 Y = -Y;
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108
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109 LODWORD(dividend) = Y << 16;
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110 HIDWORD(dividend) = Y >> 16;
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111 quotient = dividend / X;
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112
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113 //looks like binary search
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114 {
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115 int i;
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116 highIdx = uIntegerHalfPi;
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117 lowIdx = 0;
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118
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119 for (i = 0; i < 6; ++i)
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120 {
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121 if (quotient <= pTanTable[(lowIdx + highIdx) / 2])
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122 highIdx = (lowIdx + highIdx) / 2;
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123 else
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124 lowIdx = (lowIdx + highIdx) / 2;
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125 }
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126 }
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127
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128 angle = lowIdx + 1;
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129 while ( angle < (highIdx - 1) && quotient >= pTanTable[angle] )
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130 ++angle;
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131
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132 switch (quadrant)
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133 {
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134 case 1: //X > 0, Y > 0
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135 return angle;
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136
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137 case 2: //X > 0, Y < 0
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138 return uIntegerDoublePi - angle; //2*Pi - angle
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139
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140 case 3: //X > 0, Y < 0
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141 return uIntegerPi + angle; //Pi + angle
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142
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143 case 4: //X < 0, Y > 0
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144 return uIntegerPi - angle; //Pi - angle
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145 }
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146
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147 //should newer get here
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148 return 0;
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149 }
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150
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151 if ( X < 0 ) //Y == 0, X < 0
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152 return uIntegerPi;
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153
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154 return 0;
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155 }
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156
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157 //----- (0042EBDB) --------------------------------------------------------
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158 int stru193_math::Sin(int angle)
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159 {
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160 return Cos(angle - this->uIntegerHalfPi);
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161 }
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162
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163 //----- (0042EBBE) --------------------------------------------------------
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164 //----- (004453C0) mm6-----------------------------------------------------
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165 //----- (004A1760) mm6_chinese---------------------------------------------
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166 __int64 fixpoint_mul(int a1, int a2)
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167 {
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168 return ((__int64)a1 * (__int64)a2) >> 16;
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169 }
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170
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171 __int64 fixpoint_dot(int x1, int x2, int y1, int y2, int z1, int z2)
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172 {
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173 return fixpoint_mul(x1, x2) +
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174 fixpoint_mul(y1, y2) +
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175 fixpoint_mul(z1, z2);
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176 }
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177
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178 //----- (004A1780) mm6_chinese---------------------------------------------
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179 __int64 fixpoint_div(int a1, int a2)
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180 {
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181 return ((__int64)a1 << 16) / a2;
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182 }
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183
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184 __int64 fixpoint_sub_unknown(int a1, int a2)
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185 {
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186 return (((__int64)a1 << 16) * a2) >> 16;
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187 }
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188
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189 //----- (0048B561) --------------------------------------------------------
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190 int fixpoint_from_float(float val)
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191 {
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192 // float X.Yf -> int XXXX YYYY
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193 int left = floorf((val - 0.5f) + 0.5f);
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194 int right = floorf((val - left) * 65536.0f);
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195 return (left << 16) | right;
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196 }
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197
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198 int fixpoint_from_int(int lhv, int rhv)
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199 {
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200 return (lhv << 16) | rhv;
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201 }