1 | /* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
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2 | /* |
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3 | * Copyright (C) 2004-2013 HUBzero Foundation, LLC |
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4 | * |
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5 | */ |
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6 | #include <string.h> |
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7 | #include <memory.h> |
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8 | #include <time.h> |
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9 | #include <sys/time.h> |
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10 | #include <math.h> |
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11 | #include <stdlib.h> |
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12 | |
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13 | #include <vrmath/Vector3f.h> |
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14 | |
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15 | #include "VolumeInterpolator.h" |
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16 | #include "Volume.h" |
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17 | #include "Trace.h" |
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18 | |
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19 | using namespace nv; |
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20 | using namespace vrmath; |
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21 | |
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22 | VolumeInterpolator::VolumeInterpolator() : |
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23 | _volume(0), |
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24 | _interval(8.0), |
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25 | _started(false), |
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26 | _numBytes(0), |
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27 | _dataCount(0), |
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28 | _numComponents(0) |
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29 | { |
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30 | } |
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31 | |
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32 | void VolumeInterpolator::start() |
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33 | { |
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34 | if (!_volumes.empty()) { |
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35 | TRACE("Volume Interpolation Started"); |
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36 | _started = true; |
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37 | } else { |
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38 | TRACE("Volume Interpolation NOT Started"); |
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39 | _started = false; |
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40 | } |
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41 | struct timeval clock; |
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42 | gettimeofday(&clock, NULL); |
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43 | _startTime = clock.tv_sec + clock.tv_usec/1000000.0; |
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44 | TRACE("Leave"); |
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45 | } |
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46 | |
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47 | void VolumeInterpolator::stop() |
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48 | { |
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49 | _started = false; |
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50 | } |
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51 | |
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52 | Volume *VolumeInterpolator::update(float fraction) |
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53 | { |
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54 | int key1, key2; |
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55 | float interp; |
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56 | |
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57 | computeKeys(fraction, _volumes.size(), &interp, &key1, &key2); |
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58 | |
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59 | if (interp == 0.0f) { |
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60 | memcpy(_volume->data(), _volumes[key1]->data(), _numBytes); |
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61 | _volume->tex()->update(_volume->data()); |
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62 | } else { |
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63 | float *data1 = _volumes[key1]->data(); |
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64 | float *data2 = _volumes[key2]->data(); |
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65 | float *result = _volume->data(); |
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66 | |
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67 | Vector3f normal1, normal2, normal; |
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68 | for (unsigned int i = 0; i < _dataCount; ++i) { |
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69 | *result = interp * (*data2 - *data1) + *data1; |
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70 | normal1 = (*(Vector3f*)(data1 + 1) - 0.5) * 2; |
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71 | normal2 = (*(Vector3f*)(data2 + 1) - 0.5) * 2; |
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72 | normal = (normal2 - normal2) * interp + normal1; |
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73 | normal = normal.normalize(); |
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74 | normal = normal * 0.5 + 0.5; |
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75 | *((Vector3f*)(result + 1)) = normal; |
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76 | |
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77 | result += _numComponents; |
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78 | data1 += _numComponents; |
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79 | data2 += _numComponents; |
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80 | } |
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81 | |
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82 | _volume->tex()->update(_volume->data()); |
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83 | } |
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84 | |
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85 | return _volume; |
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86 | } |
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87 | |
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88 | void |
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89 | VolumeInterpolator::computeKeys(float fraction, int count, float *interp, |
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90 | int *key1, int *key2) |
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91 | { |
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92 | int limit = (int) count - 1; |
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93 | if (fraction <= 0) { |
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94 | *key1 = *key2 = 0; |
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95 | *interp = 0.0f; |
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96 | } else if (fraction >= 1.0f) { |
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97 | *key1 = *key2 = limit; |
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98 | *interp = 0.0f; |
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99 | } else { |
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100 | int n; |
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101 | for (n = 0; n < limit; n++){ |
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102 | if (fraction >= (n / (count - 1.0f)) && |
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103 | fraction < ((n+1)/(count-1.0f))) { |
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104 | break; |
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105 | } |
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106 | } |
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107 | |
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108 | TRACE("n = %d count = %d", n, count); |
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109 | if (n >= limit) { |
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110 | *key1 = *key2 = limit; |
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111 | *interp = 0.0f; |
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112 | } else { |
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113 | *key1 = n; |
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114 | *key2 = n+1; |
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115 | *interp = (fraction - (n / (count -1.0f))) / ((n + 1) / (count - 1.0f) - n / (count - 1.0f)); |
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116 | //*ret = inter * (keyValue[n + 1] - keyValue[n]) + keyValue[n]; |
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117 | } |
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118 | } |
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119 | } |
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120 | |
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121 | void |
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122 | VolumeInterpolator::clearAll() |
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123 | { |
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124 | _volumes.clear(); |
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125 | } |
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126 | |
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127 | void |
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128 | VolumeInterpolator::addVolume(Volume *volume) |
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129 | { |
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130 | if (!_volumes.empty()) { |
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131 | if (_volumes[0]->width() != volume->width() || |
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132 | _volumes[0]->height() != volume->height() || |
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133 | _volumes[0]->depth() != volume->depth() || |
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134 | _volumes[0]->numComponents() != volume->numComponents()) { |
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135 | TRACE("The volume should be the same width, height, number of components"); |
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136 | return; |
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137 | } |
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138 | } else { |
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139 | _dataCount = volume->width() * volume->height() * volume->depth(); |
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140 | _numComponents = volume->numComponents(); |
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141 | _numBytes = _dataCount * _numComponents * sizeof(float); |
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142 | _volume = new Volume(volume->width(), |
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143 | volume->height(), |
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144 | volume->depth(), |
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145 | volume->numComponents(), |
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146 | volume->data(), |
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147 | volume->wAxis.min(), |
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148 | volume->wAxis.max(), |
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149 | volume->nonZeroMin()); |
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150 | |
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151 | _volume->setPosition(volume->getPosition()); |
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152 | _volume->setScale(volume->getScale()); |
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153 | _volume->disableCutplane(0); |
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154 | _volume->disableCutplane(1); |
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155 | _volume->disableCutplane(2); |
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156 | _volume->visible(true); |
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157 | _volume->dataEnabled(true); |
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158 | _volume->ambient(volume->ambient()); |
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159 | _volume->diffuse(volume->diffuse()); |
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160 | _volume->specularLevel(volume->specularLevel()); |
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161 | _volume->specularExponent(volume->specularExponent()); |
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162 | _volume->opacityScale(volume->opacityScale()); |
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163 | _volume->isosurface(0); |
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164 | } |
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165 | _volumes.push_back(volume); |
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166 | TRACE("Volume \"%s\" is added to VolumeInterpolator", volume->name()); |
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167 | } |
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168 | |
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169 | Volume *VolumeInterpolator::getVolume() |
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170 | { |
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171 | return _volume; |
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172 | } |
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