1 | |
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2 | /* |
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3 | * ---------------------------------------------------------------------- |
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4 | * VolumeRenderer.cpp : VolumeRenderer class for volume visualization |
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5 | * |
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6 | * ====================================================================== |
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7 | * AUTHOR: Wei Qiao <qiaow@purdue.edu> |
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8 | * Purdue Rendering and Perceptualization Lab (PURPL) |
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9 | * |
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10 | * Copyright (c) 2004-2006 Purdue Research Foundation |
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11 | * |
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12 | * See the file "license.terms" for information on usage and |
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13 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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14 | * ====================================================================== |
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15 | */ |
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16 | |
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17 | #include <assert.h> |
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18 | #include <time.h> |
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19 | #include <sys/time.h> |
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20 | #include "nanovis.h" |
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21 | #include <R2/R2string.h> |
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22 | #include <R2/R2FilePath.h> |
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23 | #include "VolumeRenderer.h" |
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24 | #include "VolumeInterpolator.h" |
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25 | #include "NvStdVertexShader.h" |
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26 | #include "Trace.h" |
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27 | #include "Grid.h" |
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28 | |
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29 | #define NUMDIGITS 6 |
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30 | |
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31 | VolumeRenderer::VolumeRenderer(): |
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32 | slice_mode(false), |
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33 | volume_mode(true) |
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34 | { |
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35 | init_shaders(); |
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36 | |
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37 | const char *path = R2FilePath::getInstance()->getPath("Font.bmp"); |
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38 | if (path == NULL) { |
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39 | fprintf(stderr, "can't find Font.bmp\n"); |
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40 | assert(path != NULL); |
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41 | } |
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42 | init_font(path); |
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43 | delete [] path; |
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44 | _volumeInterpolator = new VolumeInterpolator(); |
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45 | } |
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46 | |
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47 | VolumeRenderer::~VolumeRenderer() |
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48 | { |
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49 | delete _zincBlendeShader; |
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50 | delete _regularVolumeShader; |
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51 | delete _stdVertexShader; |
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52 | delete _volumeInterpolator; |
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53 | } |
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54 | |
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55 | //initialize the volume shaders |
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56 | void VolumeRenderer::init_shaders(){ |
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57 | |
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58 | //standard vertex program |
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59 | _stdVertexShader = new NvStdVertexShader(); |
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60 | |
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61 | //volume rendering shader: one cubic volume |
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62 | _regularVolumeShader = new NvRegularVolumeShader(); |
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63 | |
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64 | //volume rendering shader: one zincblende orbital volume. |
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65 | //This shader renders one orbital of the simulation. |
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66 | //A sim has S, P, D, SS orbitals. thus a full rendering requires 4 zincblende orbital volumes. |
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67 | //A zincblende orbital volume is decomposed into 2 "interlocking" cubic 4-component volumes and passed to the shader. |
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68 | //We render each orbital with a independent transfer functions then blend the result. |
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69 | // |
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70 | //The engine is already capable of rendering multiple volumes and combine them. Thus, we just invoke this shader on |
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71 | //S, P, D and SS orbitals with different transfor functions. The result is a multi-orbital rendering. |
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72 | _zincBlendeShader = new NvZincBlendeVolumeShader(); |
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73 | } |
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74 | |
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75 | struct SortElement { |
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76 | float z; |
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77 | int volume_id; |
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78 | int slice_id; |
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79 | SortElement(float _z, int _v, int _s): |
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80 | z(_z), volume_id(_v), slice_id(_s){} |
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81 | }; |
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82 | |
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83 | int slice_sort(const void* a, const void* b){ |
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84 | if((*((SortElement*)a)).z > (*((SortElement*)b)).z) |
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85 | return 1; |
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86 | else |
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87 | return -1; |
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88 | } |
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89 | |
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90 | |
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91 | void |
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92 | VolumeRenderer::render_all() |
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93 | { |
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94 | size_t total_rendered_slices = 0; |
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95 | |
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96 | if (_volumeInterpolator->is_started()) { |
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97 | #ifdef notdef |
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98 | ani_vol = _volumeInterpolator->getVolume(); |
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99 | ani_tf = ani_vol->transferFunction(); |
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100 | #endif |
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101 | Trace("VOLUME INTERPOLATOR IS STARTED ----------------------------"); |
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102 | } |
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103 | // Determine the volumes that are to be rendered. |
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104 | vector<Volume *> volumes; |
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105 | Tcl_HashEntry *hPtr; |
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106 | Tcl_HashSearch iter; |
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107 | for (hPtr = Tcl_FirstHashEntry(&NanoVis::volumeTable, &iter); hPtr != NULL; |
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108 | hPtr = Tcl_NextHashEntry(&iter)) { |
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109 | Volume* volPtr; |
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110 | volPtr = (Volume *)Tcl_GetHashValue(hPtr); |
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111 | if(!volPtr->visible()) { |
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112 | continue; // Skip this volume |
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113 | } |
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114 | // BE CAREFUL: Set the number of slices to something slightly |
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115 | // different for each volume. If we have identical volumes at exactly |
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116 | // the same position with exactly the same number of slices, the |
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117 | // second volume will overwrite the first, so the first won't appear |
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118 | // at all. |
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119 | volumes.push_back(volPtr); |
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120 | volPtr->n_slices(256 - volumes.size()); |
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121 | } |
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122 | |
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123 | //two dimension pointer array |
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124 | ConvexPolygon*** polys = new ConvexPolygon**[volumes.size()]; |
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125 | //number of actual slices for each volume |
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126 | size_t* actual_slices = new size_t[volumes.size()]; |
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127 | |
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128 | Trace("start loop %d\n", volumes.size()); |
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129 | for (size_t i = 0; i < volumes.size(); i++) { |
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130 | Volume* volPtr; |
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131 | |
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132 | polys[i] = NULL; |
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133 | actual_slices[i] = 0; |
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134 | volPtr = volumes[i]; |
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135 | |
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136 | int n_slices = volPtr->n_slices(); |
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137 | if (volPtr->isosurface()) { |
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138 | // double the number of slices |
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139 | n_slices <<= 1; |
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140 | } |
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141 | |
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142 | //volume start location |
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143 | Vector3 loc = volPtr->location(); |
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144 | Vector4 shift_4d(loc.x, loc.y, loc.z, 0); |
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145 | |
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146 | double x0 = 0; |
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147 | double y0 = 0; |
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148 | double z0 = 0; |
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149 | |
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150 | Mat4x4 model_view_no_trans, model_view_trans; |
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151 | Mat4x4 model_view_no_trans_inverse, model_view_trans_inverse; |
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152 | |
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153 | double zNear, zFar; |
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154 | |
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155 | //initialize volume plane with world coordinates |
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156 | Plane volume_planes[6]; |
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157 | volume_planes[0].set_coeffs( 1, 0, 0, -x0); |
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158 | volume_planes[1].set_coeffs(-1, 0, 0, x0+1); |
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159 | volume_planes[2].set_coeffs( 0, 1, 0, -y0); |
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160 | volume_planes[3].set_coeffs( 0, -1, 0, y0+1); |
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161 | volume_planes[4].set_coeffs( 0, 0, 1, -z0); |
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162 | volume_planes[5].set_coeffs( 0, 0, -1, z0+1); |
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163 | |
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164 | //get modelview matrix with no translation |
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165 | glPushMatrix(); |
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166 | glScalef(volPtr->aspect_ratio_width, |
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167 | volPtr->aspect_ratio_height, |
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168 | volPtr->aspect_ratio_depth); |
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169 | |
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170 | glEnable(GL_DEPTH_TEST); |
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171 | |
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172 | GLfloat mv_no_trans[16]; |
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173 | glGetFloatv(GL_MODELVIEW_MATRIX, mv_no_trans); |
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174 | |
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175 | model_view_no_trans = Mat4x4(mv_no_trans); |
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176 | model_view_no_trans_inverse = model_view_no_trans.inverse(); |
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177 | |
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178 | glPopMatrix(); |
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179 | |
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180 | //get modelview matrix with translation |
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181 | glPushMatrix(); |
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182 | glTranslatef(shift_4d.x, shift_4d.y, shift_4d.z); |
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183 | glScalef(volPtr->aspect_ratio_width, |
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184 | volPtr->aspect_ratio_height, |
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185 | volPtr->aspect_ratio_depth); |
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186 | GLfloat mv_trans[16]; |
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187 | glGetFloatv(GL_MODELVIEW_MATRIX, mv_trans); |
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188 | |
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189 | model_view_trans = Mat4x4(mv_trans); |
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190 | model_view_trans_inverse = model_view_trans.inverse(); |
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191 | |
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192 | //draw volume bounding box with translation (the correct location in |
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193 | //space) |
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194 | if (volPtr->outline()) { |
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195 | float olcolor[3]; |
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196 | volPtr->get_outline_color(olcolor); |
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197 | draw_bounding_box(x0, y0, z0, x0+1, y0+1, z0+1, |
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198 | (double)olcolor[0], (double)olcolor[1], (double)olcolor[2], |
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199 | 1.5); |
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200 | } |
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201 | glPopMatrix(); |
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202 | |
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203 | //draw labels |
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204 | glPushMatrix(); |
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205 | glTranslatef(shift_4d.x, shift_4d.y, shift_4d.z); |
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206 | if(volPtr->outline()) { |
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207 | //draw_label(i); |
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208 | } |
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209 | glPopMatrix(); |
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210 | |
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211 | //transform volume_planes to eye coordinates. |
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212 | for(size_t j = 0; j < 6; j++) { |
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213 | volume_planes[j].transform(model_view_no_trans); |
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214 | } |
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215 | get_near_far_z(mv_no_trans, zNear, zFar); |
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216 | |
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217 | //compute actual rendering slices |
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218 | float z_step = fabs(zNear-zFar)/n_slices; |
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219 | size_t n_actual_slices; |
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220 | |
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221 | if (volPtr->data_enabled()) { |
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222 | n_actual_slices = (int)(fabs(zNear-zFar)/z_step + 1); |
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223 | polys[i] = new ConvexPolygon*[n_actual_slices]; |
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224 | } else { |
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225 | n_actual_slices = 0; |
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226 | polys[i] = NULL; |
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227 | } |
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228 | actual_slices[i] = n_actual_slices; |
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229 | |
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230 | Vector4 vert1 = (Vector4(-10, -10, -0.5, 1)); |
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231 | Vector4 vert2 = (Vector4(-10, +10, -0.5, 1)); |
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232 | Vector4 vert3 = (Vector4(+10, +10, -0.5, 1)); |
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233 | Vector4 vert4 = (Vector4(+10, -10, -0.5, 1)); |
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234 | |
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235 | |
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236 | // Render cutplanes first with depth test enabled. They will mark the |
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237 | // image with their depth values. Then we render other volume slices. |
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238 | // These volume slices will be occluded correctly by the cutplanes and |
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239 | // vice versa. |
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240 | |
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241 | ConvexPolygon static_poly; |
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242 | for(int j = 0; j < volPtr->get_cutplane_count(); j++) { |
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243 | if(!volPtr->cutplane_is_enabled(j)) |
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244 | continue; |
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245 | |
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246 | float offset = volPtr->get_cutplane(j)->offset; |
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247 | int axis = volPtr->get_cutplane(j)->orient; |
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248 | |
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249 | if(axis==3){ |
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250 | vert1 = Vector4(-10, -10, offset, 1); |
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251 | vert2 = Vector4(-10, +10, offset, 1); |
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252 | vert3 = Vector4(+10, +10, offset, 1); |
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253 | vert4 = Vector4(+10, -10, offset, 1); |
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254 | //continue; |
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255 | } else if(axis==1){ |
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256 | vert1 = Vector4(offset, -10, -10, 1); |
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257 | vert2 = Vector4(offset, +10, -10, 1); |
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258 | vert3 = Vector4(offset, +10, +10, 1); |
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259 | vert4 = Vector4(offset, -10, +10, 1); |
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260 | //continue; |
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261 | } else if(axis==2){ |
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262 | vert1 = Vector4(-10, offset, -10, 1); |
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263 | vert2 = Vector4(+10, offset, -10, 1); |
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264 | vert3 = Vector4(+10, offset, +10, 1); |
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265 | vert4 = Vector4(-10, offset, +10, 1); |
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266 | //continue; |
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267 | } |
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268 | |
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269 | vert1 = model_view_no_trans.transform(vert1); |
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270 | vert2 = model_view_no_trans.transform(vert2); |
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271 | vert3 = model_view_no_trans.transform(vert3); |
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272 | vert4 = model_view_no_trans.transform(vert4); |
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273 | |
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274 | ConvexPolygon* p = &static_poly; |
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275 | p->vertices.clear(); |
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276 | |
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277 | p->append_vertex(vert1); |
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278 | p->append_vertex(vert2); |
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279 | p->append_vertex(vert3); |
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280 | p->append_vertex(vert4); |
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281 | |
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282 | for(size_t k = 0; k < 6; k++){ |
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283 | p->clip(volume_planes[k], true); |
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284 | } |
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285 | |
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286 | p->transform(model_view_no_trans_inverse); |
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287 | p->transform(model_view_trans); |
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288 | |
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289 | glPushMatrix(); |
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290 | glScalef(volPtr->aspect_ratio_width, volPtr->aspect_ratio_height, |
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291 | volPtr->aspect_ratio_depth); |
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292 | |
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293 | activate_volume_shader(volPtr, true); |
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294 | glPopMatrix(); |
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295 | |
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296 | glEnable(GL_DEPTH_TEST); |
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297 | glDisable(GL_BLEND); |
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298 | |
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299 | glBegin(GL_POLYGON); |
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300 | p->Emit(true); |
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301 | glEnd(); |
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302 | glDisable(GL_DEPTH_TEST); |
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303 | |
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304 | deactivate_volume_shader(); |
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305 | } //done cutplanes |
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306 | |
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307 | |
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308 | //Now do volume rendering |
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309 | |
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310 | vert1 = (Vector4(-10, -10, -0.5, 1)); |
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311 | vert2 = (Vector4(-10, +10, -0.5, 1)); |
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312 | vert3 = (Vector4(+10, +10, -0.5, 1)); |
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313 | vert4 = (Vector4(+10, -10, -0.5, 1)); |
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314 | |
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315 | size_t counter = 0; |
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316 | |
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317 | //transform slices and store them |
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318 | float slice_z; |
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319 | for (size_t j = 0; j < n_actual_slices; j++) { |
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320 | slice_z = zFar + j * z_step; //back to front |
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321 | |
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322 | ConvexPolygon *poly = new ConvexPolygon(); |
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323 | polys[i][counter] = poly; |
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324 | counter++; |
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325 | |
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326 | poly->vertices.clear(); |
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327 | poly->set_id(i); |
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328 | |
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329 | //Setting Z-coordinate |
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330 | vert1.z = slice_z; |
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331 | vert2.z = slice_z; |
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332 | vert3.z = slice_z; |
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333 | vert4.z = slice_z; |
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334 | |
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335 | poly->append_vertex(vert1); |
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336 | poly->append_vertex(vert2); |
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337 | poly->append_vertex(vert3); |
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338 | poly->append_vertex(vert4); |
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339 | |
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340 | for(size_t k = 0; k < 6; k++) { |
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341 | poly->clip(volume_planes[k], true); |
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342 | } |
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343 | |
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344 | poly->transform(model_view_no_trans_inverse); |
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345 | poly->transform(model_view_trans); |
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346 | |
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347 | if(poly->vertices.size()>=3) |
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348 | total_rendered_slices++; |
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349 | } |
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350 | |
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351 | } //iterate all volumes |
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352 | Trace("end loop\n"); |
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353 | |
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354 | // We sort all the polygons according to their eye-space depth, from |
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355 | // farthest to the closest. This step is critical for correct blending |
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356 | |
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357 | SortElement* slices = (SortElement*) |
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358 | malloc(sizeof(SortElement) * total_rendered_slices); |
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359 | |
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360 | size_t counter = 0; |
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361 | for (size_t i = 0; i < volumes.size(); i++){ |
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362 | for (size_t j = 0; j < actual_slices[i]; j++){ |
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363 | if(polys[i][j]->vertices.size() >= 3){ |
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364 | slices[counter] = SortElement(polys[i][j]->vertices[0].z, i, j); |
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365 | counter++; |
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366 | } |
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367 | } |
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368 | } |
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369 | |
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370 | //sort them |
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371 | qsort(slices, total_rendered_slices, sizeof(SortElement), slice_sort); |
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372 | |
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373 | //Now we are ready to render all the slices from back to front |
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374 | glEnable(GL_DEPTH_TEST); |
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375 | glEnable(GL_BLEND); |
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376 | |
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377 | for(size_t i = 0; i < total_rendered_slices; i++){ |
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378 | Volume* volPtr; |
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379 | |
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380 | int volume_index = slices[i].volume_id; |
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381 | int slice_index = slices[i].slice_id; |
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382 | ConvexPolygon* cur = polys[volume_index][slice_index]; |
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383 | |
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384 | volPtr = volumes[volume_index]; |
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385 | glPushMatrix(); |
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386 | glScalef(volPtr->aspect_ratio_width, volPtr->aspect_ratio_height, |
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387 | volPtr->aspect_ratio_depth); |
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388 | |
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389 | #ifdef notdef |
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390 | Trace("shading slice: volume %s addr=%x slice=%d, volume=%d\n", |
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391 | volPtr->name(), volPtr, slice_index, volume_index); |
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392 | #endif |
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393 | activate_volume_shader(volPtr, false); |
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394 | glPopMatrix(); |
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395 | |
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396 | glBegin(GL_POLYGON); |
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397 | cur->Emit(true); |
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398 | glEnd(); |
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399 | |
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400 | deactivate_volume_shader(); |
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401 | } |
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402 | |
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403 | glDisable(GL_DEPTH_TEST); |
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404 | glDisable(GL_BLEND); |
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405 | |
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406 | //Deallocate all the memory used |
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407 | for(size_t i = 0; i < volumes.size(); i++){ |
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408 | for(size_t j=0; j <actual_slices[i]; j++){ |
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409 | delete polys[i][j]; |
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410 | } |
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411 | if (polys[i]) { |
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412 | delete[] polys[i]; |
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413 | } |
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414 | } |
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415 | delete[] polys; |
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416 | delete[] actual_slices; |
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417 | free(slices); |
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418 | } |
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419 | |
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420 | void |
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421 | VolumeRenderer::draw_bounding_box(float x0, float y0, float z0, |
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422 | float x1, float y1, float z1, |
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423 | float r, float g, float b, |
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424 | float line_width) |
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425 | { |
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426 | glPushMatrix(); |
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427 | glEnable(GL_DEPTH_TEST); |
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428 | glDisable(GL_TEXTURE_2D); |
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429 | glEnable(GL_BLEND); |
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430 | |
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431 | glColor4d(r, g, b, 1.0); |
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432 | glLineWidth(line_width); |
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433 | |
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434 | glBegin(GL_LINE_LOOP); |
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435 | { |
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436 | glVertex3d(x0, y0, z0); |
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437 | glVertex3d(x1, y0, z0); |
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438 | glVertex3d(x1, y1, z0); |
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439 | glVertex3d(x0, y1, z0); |
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440 | } |
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441 | glEnd(); |
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442 | |
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443 | glBegin(GL_LINE_LOOP); |
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444 | { |
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445 | glVertex3d(x0, y0, z1); |
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446 | glVertex3d(x1, y0, z1); |
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447 | glVertex3d(x1, y1, z1); |
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448 | glVertex3d(x0, y1, z1); |
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449 | } |
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450 | glEnd(); |
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451 | |
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452 | |
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453 | glBegin(GL_LINE_LOOP); |
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454 | { |
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455 | glVertex3d(x0, y0, z0); |
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456 | glVertex3d(x0, y0, z1); |
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457 | glVertex3d(x0, y1, z1); |
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458 | glVertex3d(x0, y1, z0); |
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459 | } |
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460 | glEnd(); |
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461 | |
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462 | glBegin(GL_LINE_LOOP); |
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463 | { |
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464 | glVertex3d(x1, y0, z0); |
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465 | glVertex3d(x1, y0, z1); |
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466 | glVertex3d(x1, y1, z1); |
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467 | glVertex3d(x1, y1, z0); |
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468 | } |
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469 | glEnd(); |
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470 | |
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471 | #ifdef notdef |
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472 | /* Rappture doesn't supply axis units yet. So turn labeling off until we |
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473 | * can display the proper units with the distance of each bounding box |
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474 | * dimension. |
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475 | */ |
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476 | glColor4f(1.0f, 1.0f, 0.0f, 1.0f); |
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477 | |
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478 | if (NanoVis::fonts != NULL) { |
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479 | double mv[16], prjm[16]; |
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480 | int viewport[4]; |
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481 | double wx, wy, wz; |
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482 | double dx, dy, dz; |
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483 | |
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484 | glGetDoublev(GL_MODELVIEW_MATRIX, mv); |
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485 | glGetDoublev(GL_PROJECTION_MATRIX, prjm); |
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486 | glGetIntegerv(GL_VIEWPORT, viewport); |
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487 | |
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488 | NanoVis::fonts->begin(); |
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489 | dx = x1 - x0; |
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490 | dy = y1 - y0; |
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491 | dz = z1 - z0; |
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492 | if (gluProject((x0 + x1) * 0.5, y0, z0, mv, prjm, viewport, |
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493 | &wx, &wy, &wz)) { |
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494 | char buff[20]; |
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495 | double min, max; |
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496 | |
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497 | NanoVis::grid->xAxis.GetDataLimits(min, max); |
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498 | glLoadIdentity(); |
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499 | glTranslatef((int)wx, viewport[3] - (int) wy, 0.0f); |
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500 | const char *units; |
---|
501 | units = NanoVis::grid->xAxis.GetUnits(); |
---|
502 | sprintf(buff, "%.*g %s", NUMDIGITS, max - min, units); |
---|
503 | NanoVis::fonts->draw(buff); |
---|
504 | } |
---|
505 | if (gluProject(x0, (y0 + y1) * 0.5, z0, mv, prjm, viewport, & |
---|
506 | wx, &wy, &wz)) { |
---|
507 | char buff[20]; |
---|
508 | double min, max; |
---|
509 | |
---|
510 | NanoVis::grid->yAxis.GetDataLimits(min, max); |
---|
511 | glLoadIdentity(); |
---|
512 | glTranslatef((int)wx, viewport[3] - (int) wy, 0.0f); |
---|
513 | const char *units; |
---|
514 | units = NanoVis::grid->yAxis.GetUnits(); |
---|
515 | sprintf(buff, "%.*g %s", NUMDIGITS, max - min, units); |
---|
516 | NanoVis::fonts->draw(buff); |
---|
517 | } |
---|
518 | if (gluProject(x0, y0, (z0 + z1) * 0.5, mv, prjm, viewport, |
---|
519 | &wx, &wy, &wz)) { |
---|
520 | glLoadIdentity(); |
---|
521 | glTranslatef((int)wx, viewport[3] - (int) wy, 0.0f); |
---|
522 | |
---|
523 | double min, max; |
---|
524 | NanoVis::grid->zAxis.GetDataLimits(min, max); |
---|
525 | const char *units; |
---|
526 | units = NanoVis::grid->zAxis.GetUnits(); |
---|
527 | char buff[20]; |
---|
528 | sprintf(buff, "%.*g %s", NUMDIGITS, max - min, units); |
---|
529 | NanoVis::fonts->draw(buff); |
---|
530 | } |
---|
531 | NanoVis::fonts->end(); |
---|
532 | }; |
---|
533 | #endif |
---|
534 | glPopMatrix(); |
---|
535 | glDisable(GL_DEPTH_TEST); |
---|
536 | glDisable(GL_BLEND); |
---|
537 | glEnable(GL_TEXTURE_2D); |
---|
538 | } |
---|
539 | |
---|
540 | |
---|
541 | |
---|
542 | void |
---|
543 | VolumeRenderer::activate_volume_shader(Volume* volPtr, bool slice_mode) |
---|
544 | { |
---|
545 | //vertex shader |
---|
546 | _stdVertexShader->bind(); |
---|
547 | TransferFunction *tfPtr = volPtr->transferFunction(); |
---|
548 | if (volPtr->volume_type() == Volume::CUBIC) { |
---|
549 | _regularVolumeShader->bind(tfPtr->id(), volPtr, slice_mode); |
---|
550 | } else if (volPtr->volume_type() == Volume::ZINCBLENDE) { |
---|
551 | _zincBlendeShader->bind(tfPtr->id(), volPtr, slice_mode); |
---|
552 | } |
---|
553 | } |
---|
554 | |
---|
555 | |
---|
556 | void VolumeRenderer::deactivate_volume_shader() |
---|
557 | { |
---|
558 | _stdVertexShader->unbind(); |
---|
559 | _regularVolumeShader->unbind(); |
---|
560 | _zincBlendeShader->unbind(); |
---|
561 | } |
---|
562 | |
---|
563 | |
---|
564 | void VolumeRenderer::get_near_far_z(Mat4x4 mv, double &zNear, double &zFar) |
---|
565 | { |
---|
566 | |
---|
567 | double x0 = 0; |
---|
568 | double y0 = 0; |
---|
569 | double z0 = 0; |
---|
570 | double x1 = 1; |
---|
571 | double y1 = 1; |
---|
572 | double z1 = 1; |
---|
573 | |
---|
574 | double zMin, zMax; |
---|
575 | zMin = 10000; |
---|
576 | zMax = -10000; |
---|
577 | |
---|
578 | double vertex[8][4]; |
---|
579 | |
---|
580 | vertex[0][0]=x0; vertex[0][1]=y0; vertex[0][2]=z0; vertex[0][3]=1.0; |
---|
581 | vertex[1][0]=x1; vertex[1][1]=y0; vertex[1][2]=z0; vertex[1][3]=1.0; |
---|
582 | vertex[2][0]=x0; vertex[2][1]=y1; vertex[2][2]=z0; vertex[2][3]=1.0; |
---|
583 | vertex[3][0]=x0; vertex[3][1]=y0; vertex[3][2]=z1; vertex[3][3]=1.0; |
---|
584 | vertex[4][0]=x1; vertex[4][1]=y1; vertex[4][2]=z0; vertex[4][3]=1.0; |
---|
585 | vertex[5][0]=x1; vertex[5][1]=y0; vertex[5][2]=z1; vertex[5][3]=1.0; |
---|
586 | vertex[6][0]=x0; vertex[6][1]=y1; vertex[6][2]=z1; vertex[6][3]=1.0; |
---|
587 | vertex[7][0]=x1; vertex[7][1]=y1; vertex[7][2]=z1; vertex[7][3]=1.0; |
---|
588 | |
---|
589 | for(int i=0;i<8;i++) { |
---|
590 | Vector4 tmp = mv.transform(Vector4(vertex[i][0], vertex[i][1], vertex[i][2], vertex[i][3])); |
---|
591 | tmp.perspective_devide(); |
---|
592 | vertex[i][2] = tmp.z; |
---|
593 | if (vertex[i][2]<zMin) zMin = vertex[i][2]; |
---|
594 | if (vertex[i][2]>zMax) zMax = vertex[i][2]; |
---|
595 | } |
---|
596 | |
---|
597 | zNear = zMax; |
---|
598 | zFar = zMin; |
---|
599 | } |
---|
600 | |
---|
601 | void VolumeRenderer::set_slice_mode(bool val) { slice_mode = val; } |
---|
602 | void VolumeRenderer::set_volume_mode(bool val) { volume_mode = val; } |
---|
603 | void VolumeRenderer::switch_slice_mode() { slice_mode = (!slice_mode); } |
---|
604 | void VolumeRenderer::switch_volume_mode() { volume_mode = (!volume_mode); } |
---|
605 | |
---|
606 | |
---|
607 | bool |
---|
608 | VolumeRenderer::init_font(const char* filename) |
---|
609 | { |
---|
610 | FILE *f; |
---|
611 | unsigned short int bfType; |
---|
612 | int bfOffBits; |
---|
613 | short int biPlanes; |
---|
614 | short int biBitCount; |
---|
615 | int biSizeImage; |
---|
616 | int width, height; |
---|
617 | int i; |
---|
618 | unsigned char temp; |
---|
619 | unsigned char* data; |
---|
620 | /* make sure the file is there and open it read-only (binary) */ |
---|
621 | f = fopen(filename, "rb"); |
---|
622 | if (f == NULL) { |
---|
623 | fprintf(stderr, "can't open font file \"%s\"\n", filename); |
---|
624 | return false; |
---|
625 | } |
---|
626 | |
---|
627 | if (fread(&bfType, sizeof(short int), 1, f) != 1) { |
---|
628 | fprintf(stderr, "can't read %lu bytes from font file \"%s\"\n", |
---|
629 | (unsigned long)sizeof(short int), filename); |
---|
630 | goto error; |
---|
631 | } |
---|
632 | |
---|
633 | /* check if file is a bitmap */ |
---|
634 | if (bfType != 19778) { |
---|
635 | fprintf(stderr, "not a bmp file.\n"); |
---|
636 | goto error; |
---|
637 | } |
---|
638 | |
---|
639 | /* get the file size */ |
---|
640 | /* skip file size and reserved fields of bitmap file header */ |
---|
641 | fseek(f, 8, SEEK_CUR); |
---|
642 | |
---|
643 | /* get the position of the actual bitmap data */ |
---|
644 | if (fread(&bfOffBits, sizeof(int), 1, f) != 1) { |
---|
645 | fprintf(stderr, "error reading file.\n"); |
---|
646 | goto error; |
---|
647 | } |
---|
648 | //printf("Data at Offset: %ld\n", bfOffBits); |
---|
649 | |
---|
650 | /* skip size of bitmap info header */ |
---|
651 | fseek(f, 4, SEEK_CUR); |
---|
652 | |
---|
653 | /* get the width of the bitmap */ |
---|
654 | if (fread(&width, sizeof(int), 1, f) != 1) { |
---|
655 | fprintf(stderr, "error reading file.\n"); |
---|
656 | goto error; |
---|
657 | } |
---|
658 | //printf("Width of Bitmap: %d\n", texture->width); |
---|
659 | |
---|
660 | /* get the height of the bitmap */ |
---|
661 | if (fread(&height, sizeof(int), 1, f) != 1) { |
---|
662 | fprintf(stderr, "error reading file.\n"); |
---|
663 | goto error; |
---|
664 | } |
---|
665 | //printf("Height of Bitmap: %d\n", texture->height); |
---|
666 | |
---|
667 | /* get the number of planes (must be set to 1) */ |
---|
668 | if (fread(&biPlanes, sizeof(short int), 1, f) != 1) { |
---|
669 | fprintf(stderr, "error reading file.\n"); |
---|
670 | goto error; |
---|
671 | } |
---|
672 | if (biPlanes != 1) { |
---|
673 | fprintf(stderr, "Error: number of Planes not 1!\n"); |
---|
674 | goto error; |
---|
675 | } |
---|
676 | |
---|
677 | /* get the number of bits per pixel */ |
---|
678 | if (fread(&biBitCount, sizeof(short int), 1, f) != 1) { |
---|
679 | fprintf(stderr, "error reading file.\n"); |
---|
680 | goto error; |
---|
681 | } |
---|
682 | |
---|
683 | //printf("Bits per Pixel: %d\n", biBitCount); |
---|
684 | if (biBitCount != 24) { |
---|
685 | fprintf(stderr, "Bits per Pixel not 24\n"); |
---|
686 | goto error; |
---|
687 | } |
---|
688 | |
---|
689 | |
---|
690 | /* calculate the size of the image in bytes */ |
---|
691 | biSizeImage = width * height * 3 * sizeof(unsigned char); |
---|
692 | data = (unsigned char*) malloc(biSizeImage); |
---|
693 | if (data == NULL) { |
---|
694 | fprintf(stderr, "Can't allocate memory for image\n"); |
---|
695 | goto error; |
---|
696 | } |
---|
697 | |
---|
698 | /* seek to the actual data */ |
---|
699 | fseek(f, bfOffBits, SEEK_SET); |
---|
700 | if (fread(data, biSizeImage, 1, f) != 1) { |
---|
701 | fprintf(stderr, "Error loading file!\n"); |
---|
702 | goto error; |
---|
703 | } |
---|
704 | fclose(f); |
---|
705 | |
---|
706 | /* swap red and blue (bgr -> rgb) */ |
---|
707 | for (i = 0; i < biSizeImage; i += 3) { |
---|
708 | temp = data[i]; |
---|
709 | data[i] = data[i + 2]; |
---|
710 | data[i + 2] = temp; |
---|
711 | } |
---|
712 | |
---|
713 | //insert alpha channel |
---|
714 | unsigned char* data_with_alpha; |
---|
715 | data_with_alpha = (unsigned char*) |
---|
716 | malloc(width*height*4*sizeof(unsigned char)); |
---|
717 | for(int i=0; i<height; i++){ |
---|
718 | for(int j=0; j<width; j++){ |
---|
719 | unsigned char r, g, b, a; |
---|
720 | r = data[3*(i*width+j)]; |
---|
721 | g = data[3*(i*width+j)+1]; |
---|
722 | b = data[3*(i*width+j)+2]; |
---|
723 | |
---|
724 | if(r==0 && g==0 && b==0) |
---|
725 | a = 0; |
---|
726 | else |
---|
727 | a = 255; |
---|
728 | |
---|
729 | data_with_alpha[4*(i*width+j)] = r; |
---|
730 | data_with_alpha[4*(i*width+j) + 1] = g; |
---|
731 | data_with_alpha[4*(i*width+j) + 2] = b; |
---|
732 | data_with_alpha[4*(i*width+j) + 3] = a; |
---|
733 | |
---|
734 | } |
---|
735 | } |
---|
736 | free(data); |
---|
737 | |
---|
738 | //create opengl texture |
---|
739 | glGenTextures(1, &font_texture); |
---|
740 | glBindTexture(GL_TEXTURE_2D, font_texture); |
---|
741 | //glTexImage2D(GL_TEXTURE_2D, 0, 3, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data); |
---|
742 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data_with_alpha); |
---|
743 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
---|
744 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
---|
745 | glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); |
---|
746 | |
---|
747 | free(data_with_alpha); |
---|
748 | |
---|
749 | build_font(); |
---|
750 | return (glGetError()==0); |
---|
751 | |
---|
752 | error: |
---|
753 | fclose(f); |
---|
754 | return false; |
---|
755 | } |
---|
756 | |
---|
757 | |
---|
758 | |
---|
759 | void |
---|
760 | VolumeRenderer::draw_label(Volume* vol) |
---|
761 | { |
---|
762 | |
---|
763 | //glEnable(GL_TEXTURE_2D); |
---|
764 | glDisable(GL_TEXTURE_2D); |
---|
765 | glEnable(GL_DEPTH_TEST); |
---|
766 | |
---|
767 | //x |
---|
768 | glColor3f(0.5, 0.5, 0.5); |
---|
769 | |
---|
770 | int length = vol->label[0].size(); |
---|
771 | glPushMatrix(); |
---|
772 | |
---|
773 | glTranslatef(.5*vol->aspect_ratio_width, vol->aspect_ratio_height, |
---|
774 | -0.1*vol->aspect_ratio_depth); |
---|
775 | glRotatef(180, 0, 0, 1); |
---|
776 | glRotatef(90, 1, 0, 0); |
---|
777 | |
---|
778 | glScalef(0.0008, 0.0008, 0.0008); |
---|
779 | for(int i=0; i<length; i++){ |
---|
780 | glutStrokeCharacter(GLUT_STROKE_ROMAN, vol->label[0].c_str()[i]); |
---|
781 | glTranslatef(0.04, 0., 0.); |
---|
782 | } |
---|
783 | glPopMatrix(); |
---|
784 | |
---|
785 | //y |
---|
786 | length = vol->label[1].size(); |
---|
787 | glPushMatrix(); |
---|
788 | glTranslatef(vol->aspect_ratio_width, 0.5*vol->aspect_ratio_height, -0.1*vol->aspect_ratio_depth); |
---|
789 | glRotatef(90, 0, 1, 0); |
---|
790 | glRotatef(90, 0, 0, 1); |
---|
791 | |
---|
792 | glScalef(0.0008, 0.0008, 0.0008); |
---|
793 | for(int i=0; i<length; i++){ |
---|
794 | glutStrokeCharacter(GLUT_STROKE_ROMAN, vol->label[1].c_str()[i]); |
---|
795 | glTranslatef(0.04, 0., 0.); |
---|
796 | } |
---|
797 | glPopMatrix(); |
---|
798 | |
---|
799 | |
---|
800 | //z |
---|
801 | length = vol->label[2].size(); |
---|
802 | glPushMatrix(); |
---|
803 | glTranslatef(0., 1.*vol->aspect_ratio_height, 0.5*vol->aspect_ratio_depth); |
---|
804 | glRotatef(90, 0, 1, 0); |
---|
805 | |
---|
806 | glScalef(0.0008, 0.0008, 0.0008); |
---|
807 | for(int i=0; i<length; i++){ |
---|
808 | glutStrokeCharacter(GLUT_STROKE_ROMAN, vol->label[2].c_str()[i]); |
---|
809 | glTranslatef(0.04, 0., 0.); |
---|
810 | } |
---|
811 | glPopMatrix(); |
---|
812 | |
---|
813 | glDisable(GL_TEXTURE_2D); |
---|
814 | } |
---|
815 | |
---|
816 | |
---|
817 | |
---|
818 | void |
---|
819 | VolumeRenderer::build_font() |
---|
820 | { |
---|
821 | GLfloat cx, cy; /* the character coordinates in our texture */ |
---|
822 | font_base = glGenLists(256); |
---|
823 | glBindTexture(GL_TEXTURE_2D, font_texture); |
---|
824 | for (int loop = 0; loop < 256; loop++) { |
---|
825 | cx = (float) (loop % 16) / 16.0f; |
---|
826 | cy = (float) (loop / 16) / 16.0f; |
---|
827 | glNewList(font_base + loop, GL_COMPILE); |
---|
828 | glBegin(GL_QUADS); |
---|
829 | glTexCoord2f(cx, 1 - cy - 0.0625f); |
---|
830 | glVertex3f(0, 0, 0); |
---|
831 | glTexCoord2f(cx + 0.0625f, 1 - cy - 0.0625f); |
---|
832 | glVertex3f(0.04, 0, 0); |
---|
833 | glTexCoord2f(cx + 0.0625f, 1 - cy); |
---|
834 | glVertex3f(0.04, 0.04, 0); |
---|
835 | glTexCoord2f(cx, 1 - cy); |
---|
836 | glVertex3f(0, 0.04, 0); |
---|
837 | glEnd(); |
---|
838 | glTranslated(0.04, 0, 0); |
---|
839 | glEndList(); |
---|
840 | } |
---|
841 | } |
---|
842 | |
---|
843 | void |
---|
844 | VolumeRenderer::glPrint(char* string, int set) |
---|
845 | { |
---|
846 | if(set>1) { |
---|
847 | set=1; |
---|
848 | } |
---|
849 | glBindTexture(GL_TEXTURE_2D, font_texture); |
---|
850 | glListBase(font_base - 32 + (128 * set)); |
---|
851 | glCallLists(strlen(string), GL_BYTE, string); |
---|
852 | } |
---|
853 | |
---|