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nuclear@3
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include "opengl.h"
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4 #include "dicomview.h"
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5 #include "rend_fast.h"
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6 #include "opt.h"
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7 #include "volume.h"
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8 #include "xfer_view.h"
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9
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10 static int win_width, win_height;
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11 static float cam_theta, cam_phi, cam_dist = 6;
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12 static int splitter_y = -1;
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13
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14 #define SPLITTER_WIDTH 5
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15
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16 static Renderer *rend;
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17 static Volume *vol;
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18 static TransferFunc *xfer;
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19
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20 extern "C" {
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21
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22 int init()
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23 {
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24 if(!opt.fname) {
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25 fprintf(stderr, "you must specify the volume data filename\n");
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26 return -1;
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27 }
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28
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29 switch(opt.rend_type) {
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30 case REND_FAST:
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31 rend = new RendererFast;
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32 break;
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33 default:
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34 return -1;
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35 }
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36
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37 if(!rend->init()) {
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38 fprintf(stderr, "renderer initialization failed\n");
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39 return -1;
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40 }
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41
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42 VoxelVolume *voxvol = new VoxelVolume;
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43 if(!voxvol->load(opt.fname)) {
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44 fprintf(stderr, "failed to load volume data from: %s\n", opt.fname);
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45 return -1;
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46 }
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47 vol = voxvol;
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48 rend->set_volume(vol);
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49
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50 xfer = new TransferWindow;
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51 rend->set_transfer_function(xfer);
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52
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53 if(!xfview_init(xfer)) {
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54 return -1;
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55 }
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56
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57 return 0;
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58 }
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59
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60 void cleanup()
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61 {
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62 xfview_destroy();
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63
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64 rend->destroy();
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65 delete rend;
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66 delete vol;
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67 delete xfer;
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68 }
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69
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70 void ev_display()
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71 {
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72 glClear(GL_COLOR_BUFFER_BIT);
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73
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74 // render the main view
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75 glViewport(0, win_height - splitter_y, win_width, splitter_y);
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76
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77 glMatrixMode(GL_PROJECTION);
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78 glLoadIdentity();
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79 gluPerspective(50.0, (float)win_width / (float)splitter_y, 0.1, 100.0);
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80
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81 glMatrixMode(GL_MODELVIEW);
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82 glLoadIdentity();
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83 glTranslatef(0, 0, -cam_dist);
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84 glRotatef(cam_phi, 1, 0, 0);
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85 glRotatef(cam_theta, 0, 1, 0);
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86
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87 rend->update(0);
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88 rend->render();
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89
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90 // draw the transfer function view
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91 glViewport(0, 0, win_width, win_height - splitter_y);
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92
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93 xfview_draw();
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94
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95 // draw the GUI
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96 glViewport(0, 0, win_width, win_height);
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97
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98 glMatrixMode(GL_PROJECTION);
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99 glLoadIdentity();
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100 glOrtho(0, win_width, win_height, 0, -1, 1);
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101
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102 glMatrixMode(GL_MODELVIEW);
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103 glLoadIdentity();
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104
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105 glBegin(GL_QUADS);
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106 glColor3f(1, 1, 1);
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107 glVertex2f(0, splitter_y + SPLITTER_WIDTH / 2);
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108 glVertex2f(win_width, splitter_y + SPLITTER_WIDTH / 2);
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109 glVertex2f(win_width, splitter_y - SPLITTER_WIDTH / 2);
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110 glVertex2f(0, splitter_y - SPLITTER_WIDTH / 2);
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111 glEnd();
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112
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113 swap_buffers();
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114 }
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115
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116 void ev_reshape(int x, int y)
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117 {
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118 if(splitter_y < 0) { // not initialized yet
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119 splitter_y = (int)(y * 0.85);
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120 } else {
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121 // calculate where the splitter was relative to the window height
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122 // and based on that, it's new position
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123 float split = (float)splitter_y / (float)win_height;
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124 splitter_y = (int)(y * split);
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125 }
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126
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127 win_width = x;
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128 win_height = y;
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129
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130 glViewport(0, 0, x, y);
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131 if(rend) {
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132 rend->reshape(x, y);
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133 }
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134 }
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135
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136 void ev_keyboard(int key, int press, int x, int y)
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137 {
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138 if(press) {
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139 switch(key) {
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140 case 27:
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141 quit();
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142 }
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143 }
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144 }
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145
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146 static bool bnstate[8];
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147 static int prev_x, prev_y;
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148
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149 #define ON_SPLITTER(y) (abs(y - splitter_y) <= SPLITTER_WIDTH / 2)
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150 static bool splitter_dragging;
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151
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152 void ev_mouse_button(int bn, int press, int x, int y)
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153 {
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154 bnstate[bn] = press != 0;
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155 prev_x = x;
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156 prev_y = y;
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157
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158 splitter_dragging = bn == 0 && press && ON_SPLITTER(y);
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159
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160 if(!splitter_dragging && y > splitter_y) {
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161 xfview_button(bn, press, x, y);
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162 }
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163 }
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164
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165 void ev_mouse_motion(int x, int y)
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166 {
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167 int dx = x - prev_x;
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168 int dy = y - prev_y;
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169 prev_x = x;
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170 prev_y = y;
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171
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172 if((dx | dy) == 0) return;
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173
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174 if(splitter_dragging) {
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175 splitter_y += dy;
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176 redisplay();
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177 return;
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178 }
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179
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180 if(y > splitter_y) {
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181 xfview_motion(x, y);
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182 return;
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183 }
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184
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185 // main view motion handling
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186 if(bnstate[0]) {
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187 cam_theta += dx * 0.5;
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188 cam_phi += dy * 0.5;
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189
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190 if(cam_phi < -90) cam_phi = -90;
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191 if(cam_phi > 90) cam_phi = 90;
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192 redisplay();
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193 }
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194 if(bnstate[2]) {
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195 cam_dist += dy * 0.1;
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196
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197 if(cam_dist < 0.0) cam_dist = 0.0;
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198 redisplay();
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199 }
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200 }
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201
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202 } // extern "C"
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