volmetrics

annotate src/main.cc @ 26:5ee081af59b8

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volume rendering
author Eleni Maria Stea <elene.mst@gmail.com>
date Sun, 27 Apr 2014 18:25:40 +0300
parents 4b6c952a83bd
children 77cbc31cd31f
rev   line source
eleni@0 1 #include <GL/glew.h>
eleni@0 2 #include <GL/glut.h>
elene@9 3 #include <GL/glui.h>
eleni@0 4
elene@17 5 #include <math.h>
eleni@0 6 #include <stdio.h>
eleni@0 7 #include <assert.h>
eleni@0 8
elene@9 9 #include <vector>
elene@9 10
elene@9 11 #include "mesh.h"
elene@22 12 #include "sdr.h"
elene@6 13 #include "volume.h"
eleni@1 14
elene@10 15 static bool init(void);
elene@10 16 static GLUI *create_ui(void);
elene@10 17 static void display(void);
elene@10 18 static void reshape(int x, int y);
elene@10 19 static void keyboard(unsigned char key, int x, int y);
elene@10 20 static void keyboard_up(unsigned char key, int x, int y);
elene@10 21 static void mouse(int button, int state, int x, int y);
elene@10 22 static void motion(int x, int y);
elene@16 23 static bool init_xfer(void);
elene@16 24 static void display_xfer(void);
elene@16 25 static void reshape_xfer(int x, int y);
elene@17 26 static void mouse_xfer(int button, int state, int x, int y);
elene@16 27 static void motion_xfer(int x, int y);
elene@25 28 static void volume_preview();
elene@25 29 static void draw_slices();
elene@25 30 static void draw_iso();
elene@25 31 static void draw_volume();
elene@16 32
elene@16 33 static int mainwin_id, xferwin_id;
elene@18 34 //todo keyb esc
elene@16 35
eleni@0 36 static int win_xsz, win_ysz;
elene@9 37 static float cam_phi, cam_theta, cam_dist = 6;
elene@9 38 static std::vector<bool> key_state(256);
eleni@0 39
elene@11 40 static const char *vol_fname = "data/test1.vol";
elene@22 41 static const char *vsdr_path = "data/shaders/transfer.v.glsl";
elene@22 42 static const char *fsdr_path = "data/shaders/transfer.f.glsl";
elene@25 43 static const char *vsdr_vol_path = "data/shaders/vol.v.glsl";
elene@25 44 static const char *fsdr_vol_path = "data/shaders/vol.f.glsl";
elene@25 45
elene@25 46 static unsigned int sprog;
elene@25 47 static unsigned int sprog_vol;
elene@6 48
elene@6 49 static Volume *vol;
elene@9 50 static Mesh *mesh;
elene@12 51 static float cur_z, thres = 0.5, thres2 = 1.0;
elene@25 52 static float slice_z = 0.5;
elene@9 53
elene@9 54 static int use_orig_vol_res = 1;
elene@9 55 static int vol_res[3]; // volume sampling resolution x/y/z
elene@26 56 static float bound_scale = 1.42;
elene@9 57
elene@9 58 static GLUI *ui;
eleni@1 59
elene@25 60 static int num_poly = 128;
elene@22 61
eleni@0 62 int main(int argc, char **argv)
eleni@0 63 {
eleni@0 64 glutInit(&argc, argv);
elene@16 65 if(argv[1])
elene@16 66 vol_fname = argv[1];
elene@16 67
elene@16 68 if(!init()) {
elene@16 69 fprintf(stderr, "Failed to initialize program.\n");
elene@16 70 return 1;
elene@16 71 }
elene@16 72
elene@16 73 init_xfer();
elene@16 74
elene@16 75 glutMainLoop();
elene@16 76 return 0;
elene@16 77 }
elene@16 78
elene@16 79 static bool init()
elene@16 80 {
elene@7 81 glutInitWindowSize(512, 512);
elene@11 82 glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
eleni@0 83
elene@16 84 mainwin_id = glutCreateWindow("CT scan");
eleni@0 85 glutDisplayFunc(display);
eleni@0 86 glutReshapeFunc(reshape);
eleni@0 87 glutKeyboardFunc(keyboard);
elene@9 88 glutKeyboardUpFunc(keyboard_up);
eleni@0 89 glutMouseFunc(mouse);
eleni@0 90 glutMotionFunc(motion);
eleni@0 91
eleni@0 92 glewInit();
eleni@0 93
elene@11 94 glEnable(GL_DEPTH_TEST);
elene@11 95 glEnable(GL_NORMALIZE);
elene@11 96
elene@22 97 glEnable(GL_LIGHTING);
elene@11 98 glEnable(GL_LIGHT0);
elene@11 99 glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 1);
elene@11 100
elene@25 101 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
elene@25 102
elene@22 103 //FIXME shaders setup
elene@22 104 if(!(sprog = sdr_getprog(vsdr_path, fsdr_path)))
elene@22 105 {
elene@22 106 fprintf(stderr, "Failed to create shader program!\n");
elene@22 107 return false;
elene@22 108 }
elene@22 109
elene@25 110 if(!(sprog_vol = sdr_getprog(vsdr_vol_path, fsdr_vol_path)))
elene@25 111 {
elene@25 112 fprintf(stderr, "Failed to create shader program!\n");
elene@25 113 return false;
elene@25 114 }
elene@25 115
elene@9 116 vol = new Volume;
elene@11 117 if(!vol->load(vol_fname)) {
elene@11 118 fprintf(stderr, "Failed to load %s", vol_fname);
elene@9 119 return false;
elene@9 120 }
elene@9 121 mesh = new Mesh;
elene@9 122 cur_z = 0.5;
elene@9 123
elene@9 124 vol_res[0] = vol->get_slice(0)->get_width();
elene@9 125 vol_res[1] = vol->get_slice(0)->get_height();
elene@9 126 vol_res[2] = vol->get_slice_count();
elene@9 127
elene@26 128 num_poly = std::max(vol_res[0], std::max(vol_res[1], vol_res[2])) * bound_scale;
elene@26 129
elene@9 130 if(!(ui = create_ui())) {
elene@9 131 return false;
elene@9 132 }
elene@9 133
elene@9 134 return true;
elene@9 135 }
elene@9 136
elene@9 137 static GLUI_Spinner *res_spin[3];
elene@9 138 static void toggle_use_orig(int id)
elene@9 139 {
elene@9 140 for(int i=0; i<3; i++) {
elene@9 141 if(use_orig_vol_res) {
elene@9 142 res_spin[i]->disable();
elene@9 143 } else {
elene@9 144 res_spin[i]->enable();
elene@9 145 }
elene@9 146 }
elene@9 147 }
elene@9 148 static void thres_change(int id)
elene@9 149 {
elene@9 150 static float prev_thres = thres;
elene@12 151 static float prev_thres2 = thres2;
elene@9 152
elene@12 153 if(prev_thres != thres || prev_thres2 != thres2) {
elene@9 154 prev_thres = thres;
elene@12 155 prev_thres2 = thres2;
elene@23 156
elene@12 157 mesh->clear();
elene@23 158
elene@23 159 glutSetWindow(xferwin_id);
elene@23 160 glutPostRedisplay();
elene@23 161 glutSetWindow(mainwin_id);
elene@23 162 glutPostRedisplay();
elene@12 163 }
elene@23 164 }
elene@16 165
elene@12 166 static void res_change(int id)
elene@12 167 {
elene@12 168 static float prev_resx = vol_res[0];
elene@12 169 static float prev_resy = vol_res[1];
elene@12 170 static float prev_resz = vol_res[2];
elene@12 171
elene@12 172 if(prev_resx != vol_res[0] || prev_resy != vol_res[1] || prev_resz != vol_res[2]) {
elene@12 173 prev_resx = vol_res[0];
elene@12 174 prev_resy = vol_res[1];
elene@12 175 prev_resz = vol_res[2];
elene@9 176 mesh->clear();
elene@9 177 }
elene@9 178 }
elene@10 179 static GLUI *create_ui()
elene@9 180 {
elene@9 181 GLUI *ui = GLUI_Master.create_glui("ui");
elene@9 182 assert(ui);
elene@9 183
elene@9 184 ui->set_main_gfx_window(glutGetWindow());
elene@9 185
elene@12 186 GLUI_Panel *thres_panel = ui->add_panel("iso thresholds");
elene@12 187
elene@12 188 GLUI_Spinner *thres_spin = ui->add_spinner_to_panel(thres_panel, "T1", GLUI_SPINNER_FLOAT, &thres, 0, thres_change);
elene@9 189 thres_spin->set_float_limits(0, 1);
elene@9 190
elene@12 191 GLUI_Spinner *thres2_spin = ui->add_spinner_to_panel(thres_panel, "T2", GLUI_SPINNER_FLOAT, &thres2, 0, thres_change);
elene@12 192 thres2_spin->set_float_limits(0, 1);
elene@12 193
elene@9 194 GLUI_Panel *res_panel = ui->add_panel("volume resolution");
elene@9 195
elene@9 196 ui->add_checkbox_to_panel(res_panel, "original resolution", &use_orig_vol_res, 0, toggle_use_orig);
elene@9 197
elene@9 198 static const char *res_spin_name[] = {"x", "y", "z"};
elene@9 199 for(int i=0; i<3; i++) {
elene@12 200 res_spin[i] = ui->add_spinner_to_panel(res_panel, res_spin_name[i], GLUI_SPINNER_INT, vol_res + i, 0, res_change);
elene@9 201 res_spin[i]->set_int_limits(8, 256); // TODO limits as arguments or config
elene@9 202 res_spin[i]->disable();
elene@9 203 }
elene@9 204
elene@20 205 GLUI_Panel *preview_panel = ui->add_panel("volume preview");
elene@20 206
elene@22 207 GLUI_Spinner *preview_spin = ui->add_spinner_to_panel(preview_panel, "slice z", GLUI_SPINNER_FLOAT, &slice_z, 0);
elene@20 208 preview_spin->set_float_limits(0, 1);
elene@20 209
elene@9 210 return ui;
elene@9 211 }
elene@9 212
elene@18 213 static void volume_preview ()
elene@18 214 {
elene@18 215 float aspect = win_xsz / win_ysz;
elene@18 216
elene@21 217 glDisable(GL_DEPTH_TEST);
elene@18 218
elene@22 219 glUseProgram(sprog);
elene@23 220 int tmin_loc = glGetUniformLocation(sprog, "tmin");
elene@23 221 if(tmin_loc != -1)
elene@23 222 glUniform1f(tmin_loc, std::min(thres, thres2));
elene@23 223 int tmax_loc = glGetUniformLocation(sprog, "tmax");
elene@23 224 if(tmax_loc != -1)
elene@23 225 glUniform1f(tmax_loc, std::max(thres, thres2));
elene@22 226
elene@18 227 glMatrixMode(GL_MODELVIEW);
elene@18 228 glPushMatrix();
elene@18 229 glLoadIdentity();
elene@18 230
elene@18 231 glMatrixMode(GL_PROJECTION);
elene@18 232 glPushMatrix();
elene@18 233 glLoadIdentity();
elene@25 234 glOrtho(0, aspect, 0, 1, -1, 1);
elene@18 235
elene@18 236 glBindTexture(GL_TEXTURE_3D, vol->get_texture());
elene@18 237 glEnable(GL_TEXTURE_3D);
elene@18 238 glBegin(GL_QUADS);
elene@21 239 glColor3f(1.0, 1.0, 1.0);
elene@25 240 glTexCoord3f(0, 0, slice_z); glVertex3f(0, 1, 0);
elene@25 241 glTexCoord3f(0, 1, slice_z); glVertex3f(0, 0.75, 0);
elene@25 242 glTexCoord3f(1, 1, slice_z); glVertex3f(0.25, 0.75, 0);
elene@25 243 glTexCoord3f(1, 0, slice_z); glVertex3f(0.25, 1, 0);
elene@18 244 glEnd();
elene@18 245 glDisable(GL_TEXTURE_3D);
elene@18 246
elene@21 247 glLineWidth(3);
elene@21 248 glBegin(GL_LINE_LOOP);
elene@21 249 glColor3f(0.4, 0.8, 0.4);
elene@21 250 glVertex3f(-1.0, 1.0, 0.0);
elene@21 251 glVertex3f(-1.0, 0.5, 0.0);
elene@21 252 glVertex3f(-0.5, 0.5, 0.0);
elene@21 253 glVertex3f(-0.5, 1.0, 0.0);
elene@21 254 glEnd();
elene@21 255
elene@18 256 glMatrixMode(GL_PROJECTION);
elene@18 257 glPopMatrix();
elene@18 258
elene@18 259 glMatrixMode(GL_MODELVIEW);
elene@18 260 glPopMatrix();
elene@18 261
elene@22 262 glUseProgram(0);
elene@22 263
elene@21 264 glEnable(GL_DEPTH_TEST);
elene@25 265 }
elene@25 266
elene@25 267 static void draw_slices()
elene@25 268 {
elene@25 269 glBindTexture(GL_TEXTURE_3D, vol->get_texture());
elene@25 270 glEnable(GL_TEXTURE_3D);
elene@25 271 glBegin(GL_QUADS);
elene@25 272 glTexCoord3f(0, 0, cur_z); glVertex3f(-1, -1, 0);
elene@25 273 glTexCoord3f(0, 1, cur_z); glVertex3f(-1, 1, 0);
elene@25 274 glTexCoord3f(1, 1, cur_z); glVertex3f(1, 1, 0);
elene@25 275 glTexCoord3f(1, 0, cur_z); glVertex3f(1, -1, 0);
elene@25 276 glEnd();
elene@25 277 glDisable(GL_TEXTURE_3D);
elene@25 278 }
elene@25 279
elene@25 280 static void draw_iso()
elene@25 281 {
elene@25 282 if(mesh->is_empty()) {
elene@25 283 printf("recalculating isosurface ... ");
elene@25 284 fflush(stdout);
elene@25 285 vol->create_mesh(mesh, thres, thres2, vol_res[0], vol_res[1], vol_res[2]);
elene@25 286 printf("done.\n");
elene@25 287 }
elene@25 288 mesh->draw();
elene@25 289 }
elene@25 290
elene@25 291 static void draw_volume()
elene@25 292 {
elene@25 293 glUseProgram(sprog_vol);
elene@25 294
elene@25 295 int tmin_loc = glGetUniformLocation(sprog_vol, "tmin");
elene@25 296 if(tmin_loc != -1)
elene@25 297 glUniform1f(tmin_loc, std::min(thres, thres2));
elene@25 298 int tmax_loc = glGetUniformLocation(sprog_vol, "tmax");
elene@25 299 if(tmax_loc != -1)
elene@25 300 glUniform1f(tmax_loc, std::max(thres, thres2));
elene@25 301
elene@25 302 int res_loc = glGetUniformLocation(sprog_vol, "res");
elene@25 303 if(res_loc != -1)
elene@26 304 glUniform3f(res_loc, (float)vol_res[0], (float)vol_res[1], (float)vol_res[2]);
elene@25 305
elene@25 306 glDisable(GL_DEPTH_TEST);
elene@25 307 glBindTexture(GL_TEXTURE_3D, vol->get_texture());
elene@25 308 glEnable(GL_TEXTURE_3D);
elene@25 309 glEnable(GL_BLEND);
elene@25 310 glBegin(GL_QUADS);
elene@25 311 for(int i=0; i<num_poly; i++)
elene@25 312 {
elene@25 313 float tex_z = (float)i / (float)num_poly;
elene@25 314 float z = 2 * tex_z - 1;
elene@25 315
elene@26 316 glTexCoord3f(0, 0, tex_z); glVertex3f(-bound_scale, -bound_scale, z * bound_scale);
elene@26 317 glTexCoord3f(0, 1, tex_z); glVertex3f(-bound_scale, bound_scale, z * bound_scale);
elene@26 318 glTexCoord3f(1, 1, tex_z); glVertex3f(bound_scale, bound_scale, z * bound_scale);
elene@26 319 glTexCoord3f(1, 0, tex_z); glVertex3f(bound_scale, -bound_scale, z * bound_scale);
elene@25 320 }
elene@25 321 glEnd();
elene@25 322 glDisable(GL_BLEND);
elene@25 323 glDisable(GL_TEXTURE_3D);
elene@25 324 glEnable(GL_DEPTH_TEST);
elene@25 325
elene@25 326 glUseProgram(0);
elene@18 327 }
elene@18 328
elene@10 329 static void display(void)
eleni@0 330 {
elene@9 331 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
elene@9 332
elene@9 333 glMatrixMode(GL_MODELVIEW);
elene@9 334 glLoadIdentity();
elene@9 335 glTranslatef(0, 0, -cam_dist);
elene@9 336 glRotatef(cam_phi, 1, 0, 0);
elene@9 337 glRotatef(cam_theta, 0, 1, 0);
elene@9 338
elene@25 339 //draw_slices();
elene@25 340 //draw_iso();
elene@25 341 draw_volume();
elene@9 342
elene@18 343 volume_preview();
eleni@0 344 glutSwapBuffers();
eleni@0 345 assert(glGetError() == GL_NO_ERROR);
eleni@0 346 }
eleni@0 347
elene@10 348 static void reshape(int x, int y)
eleni@0 349 {
eleni@0 350 glViewport(0, 0, x, y);
elene@9 351 glMatrixMode(GL_PROJECTION);
elene@9 352 glLoadIdentity();
elene@9 353 gluPerspective(45, (float)x / (float)y, 0.5, 500);
elene@9 354
elene@25 355 win_xsz = x;
elene@25 356 win_ysz = y;
eleni@0 357 }
eleni@0 358
elene@10 359 static void keyboard(unsigned char key, int x, int y)
eleni@0 360 {
elene@9 361 key_state[(int)key] = true;
elene@9 362
eleni@0 363 switch(key) {
eleni@0 364 case 27:
eleni@0 365 exit(0);
elene@9 366 case 'w':
elene@9 367 {
elene@9 368 static bool wire;
elene@9 369 wire = !wire;
elene@9 370 glPolygonMode(GL_FRONT_AND_BACK, wire ? GL_LINE : GL_FILL);
elene@9 371 }
elene@9 372 break;
eleni@0 373 default:
eleni@0 374 break;
eleni@0 375 }
eleni@0 376 }
eleni@0 377
elene@10 378 static void keyboard_up(unsigned char key, int x, int y)
elene@9 379 {
elene@9 380 key_state[(int) key] = false;
elene@9 381 }
elene@9 382
eleni@0 383 static int prev_x, prev_y;
elene@9 384 static bool bn_state[32];
elene@12 385 static float prev_thres, prev_thres2;
elene@9 386
elene@10 387 static void mouse(int bn, int state, int x, int y)
eleni@0 388 {
eleni@0 389 prev_x = x;
eleni@0 390 prev_y = y;
elene@9 391
elene@9 392 bn_state[bn - GLUT_LEFT_BUTTON] = (state == GLUT_DOWN);
elene@9 393
elene@9 394 if(state == GLUT_DOWN) {
elene@9 395 prev_thres = thres;
elene@12 396 prev_thres2 = thres2;
elene@9 397 }
elene@9 398 else {
elene@12 399 if(thres != prev_thres || thres2 != prev_thres2) {
elene@9 400 mesh->clear();
elene@9 401 }
elene@9 402 }
eleni@0 403 }
eleni@0 404
elene@10 405 static void motion(int x, int y)
eleni@0 406 {
eleni@0 407 int dx = x - prev_x;
eleni@0 408 int dy = y - prev_y;
elene@9 409
elene@9 410 if(!dx && !dy)
elene@9 411 return;
elene@9 412
eleni@0 413 prev_x = x;
eleni@0 414 prev_y = y;
elene@6 415
elene@9 416 if(key_state[(int)'t']) {
elene@9 417 thres = (float)x / (float)win_xsz;
elene@9 418 printf("threshold: %f\n", thres);
elene@9 419
elene@9 420 glutPostRedisplay();
elene@9 421 return;
elene@9 422 }
elene@9 423
elene@9 424 // camera
elene@9 425 if(bn_state[0]) {
elene@9 426 if(key_state[(int)'z']) {
elene@9 427 //zoom the camera
elene@9 428
elene@9 429 cam_dist += dy * 0.1;
elene@9 430
elene@9 431 if(cam_dist < 0)
elene@9 432 cam_dist = 0;
elene@9 433 }
elene@9 434 else {
elene@9 435 //rotate the camera
elene@9 436
elene@9 437 cam_phi += dy * 0.5;
elene@9 438 cam_theta += dx * 0.5;
elene@9 439
elene@9 440 if(cam_phi > 90)
elene@9 441 cam_phi = 90;
elene@9 442 if(cam_phi < -90)
elene@9 443 cam_phi = -90;
elene@9 444 }
elene@9 445
elene@6 446 glutPostRedisplay();
elene@6 447 }
eleni@0 448 }
elene@16 449
elene@16 450 static bool init_xfer(void)
elene@16 451 {
elene@16 452 glutSetWindow(mainwin_id);
elene@16 453 int x = glutGet(GLUT_WINDOW_X);
elene@16 454 int y = glutGet(GLUT_WINDOW_Y) + glutGet(GLUT_WINDOW_HEIGHT);
elene@16 455
elene@16 456 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
elene@16 457 glutInitWindowSize(512, 100);
elene@16 458 glutInitWindowPosition(x, y);
elene@16 459
elene@16 460 xferwin_id = glutCreateWindow("Transfer Function");
elene@16 461 glutDisplayFunc(display_xfer);
elene@16 462 glutReshapeFunc(reshape_xfer);
elene@17 463 glutMouseFunc(mouse_xfer);
elene@16 464 glutMotionFunc(motion_xfer);
elene@16 465
elene@16 466 return true;
elene@16 467 }
elene@16 468
elene@16 469 static void display_xfer(void)
elene@16 470 {
elene@16 471 glClear(GL_COLOR_BUFFER_BIT);
elene@16 472
elene@16 473 int num_val = glutGet(GLUT_WINDOW_WIDTH) / 4.0;
elene@16 474 float x = 0;
elene@16 475 float dx = 1.0 / num_val;
elene@16 476 float low, high;
elene@16 477 if(thres < thres2) {
elene@16 478 low = thres;
elene@16 479 high = thres2;
elene@16 480 }
elene@16 481 else {
elene@16 482 low = thres2;
elene@16 483 high = thres;
elene@16 484 }
elene@16 485
elene@17 486 //drawing the transfer function curve
elene@17 487
elene@17 488 glLineWidth(3);
elene@17 489 glBegin(GL_LINE_STRIP);
elene@17 490 glColor3f(0.8, 0.3, 0.8);
elene@17 491 for(int i=0; i<num_val; i++) {
elene@17 492 float val = transfer_function(x, low, high);
elene@17 493 glVertex2f(x, val);
elene@17 494 x += dx;
elene@17 495 }
elene@17 496 glEnd();
elene@17 497
elene@17 498 //threshold bars
elene@17 499
elene@17 500 glLineWidth(2);
elene@17 501 glBegin(GL_LINES);
elene@17 502 glColor3f(0.4, 0.4, 0.8);
elene@17 503 glVertex2f(low, 0);
elene@17 504 glVertex2f(low, 1);
elene@17 505 glColor3f(0.4, 0.8, 0.4);
elene@17 506 glVertex2f(high, 0);
elene@17 507 glVertex2f(high, 1);
elene@17 508 glEnd();
elene@17 509
elene@17 510 /*
elene@17 511 * gradient
elene@17 512 */
elene@17 513 /* glBegin(GL_QUADS);
elene@16 514 for(int i=0; i<num_val; i++) {
elene@16 515 float val = transfer_function(x, low, high);
elene@16 516 glColor3f(val, val, val);
elene@16 517 glVertex3f(x, 1.0, 0.0);
elene@16 518 glVertex3f(x, 0.0, 0.0);
elene@16 519
elene@16 520 val = transfer_function(x + dx, low, high);
elene@16 521 glColor3f(val, val, val);
elene@16 522 glVertex3f(x + dx, 0.0, 0.0);
elene@16 523 glVertex3f(x + dx, 1.0, 0.0);
elene@16 524 x += dx;
elene@16 525 }
elene@17 526 glEnd(); */
elene@16 527
elene@16 528 glutSwapBuffers();
elene@16 529 assert(glGetError() == GL_NO_ERROR);
elene@16 530 }
elene@16 531
elene@16 532 static void reshape_xfer(int x, int y)
elene@16 533 {
elene@16 534 glViewport(0.0, 0.0, x, y);
elene@16 535 glMatrixMode(GL_PROJECTION);
elene@16 536 glLoadIdentity();
elene@16 537 glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
elene@16 538 }
elene@16 539
elene@17 540 static float *select_thres;
elene@17 541 static float prev_select_thres;
elene@17 542 static void mouse_xfer(int button, int state, int x, int y)
elene@17 543 {
elene@17 544 if(button == GLUT_LEFT_BUTTON) {
elene@17 545 if(state == GLUT_DOWN) {
elene@17 546 int width = glutGet(GLUT_WINDOW_WIDTH);
elene@17 547 float xpos = (float)x / (float)width;
elene@17 548 if(fabs(xpos - thres) <= fabs(xpos - thres2)) {
elene@17 549 select_thres = &thres;
elene@17 550 }
elene@17 551 else {
elene@17 552 select_thres = &thres2;
elene@17 553 }
elene@17 554 prev_select_thres = *select_thres;
elene@17 555 }
elene@17 556 else {
elene@17 557 if(fabs(*select_thres - prev_select_thres) > 0.001) {
elene@17 558 mesh->clear();
elene@17 559 ui->sync_live();
elene@17 560 }
elene@17 561 select_thres = 0;
elene@17 562 }
elene@17 563 }
elene@17 564 }
elene@17 565
elene@16 566 static void motion_xfer(int x, int y)
elene@16 567 {
elene@17 568 if(!select_thres)
elene@17 569 return;
elene@17 570
elene@17 571 int width = glutGet(GLUT_WINDOW_WIDTH);
elene@17 572 float xpos = (float)x / (float)width;
elene@17 573
elene@17 574 *select_thres = xpos;
elene@23 575 thres_change(0);
elene@17 576
elene@17 577 glutPostRedisplay();
elene@17 578 glutSetWindow(mainwin_id);
elene@17 579 glutPostRedisplay();
elene@16 580 }