Pileus Git - grits/blob - src/grits-opengl.c

   1 /*
   2  * Copyright (C) 2009-2011 Andy Spencer <andy753421@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /**
  19  * SECTION:grits-opengl
  20  * @short_description: OpenGL based virtual globe
  21  *
  22  * #GritsOpenGL is the core rendering engine used by grits. Theoretically other
  23  * renderers could be writte, but they have not been. GritsOpenGL uses the ROAM
  24  * algorithm for updating surface mesh the planet. The only thing GritsOpenGL
  25  * can actually render on it's own is a wireframe of a sphere.
  26  *
  27  * GritsOpenGL requires (at least) OpenGL 2.0.
  28  */
  29
  30 #include <config.h>
  31 #include <math.h>
  32 #include <string.h>
  33 #include <gdk/gdkkeysyms.h>
  34 #include <gtk/gtk.h>
  35 #include <GL/gl.h>
  36 #include <GL/glu.h>
  37
  38 #include "grits-opengl.h"
  39 #include "grits-util.h"
  40 #include "gtkgl.h"
  41 #include "roam.h"
  42
  43 // #define ROAM_DEBUG
  44
  45 /* Tessellation, "finding intersecting triangles" */
  46 /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
  47 /* http://www.opengl.org/wiki/Alpha_Blending */
  48
  49 /* The unsorted/sroted GLists are blank head nodes,
  50  * This way us we can remove objects from the level just by fixing up links
  51  * I.e. we don't need to do a lookup to remove an object if we have its GList */
  52 struct RenderLevel {
  53         GList unsorted;
  54         GList sorted;
  55 };
  56
  57 /***********
  58  * Helpers *
  59  ***********/
  60 static void _set_visuals(GritsOpenGL *opengl)
  61 {
  62         glMatrixMode(GL_MODELVIEW);
  63         glLoadIdentity();
  64
  65         /* Camera 1 */
  66         double lat, lon, elev, rx, ry, rz;
  67         grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
  68         grits_viewer_get_rotation(GRITS_VIEWER(opengl), &rx, &ry, &rz);
  69         glRotatef(rx, 1, 0, 0);
  70         glRotatef(rz, 0, 0, 1);
  71
  72         /* Lighting */
  73 #ifdef ROAM_DEBUG
  74         float light_ambient[]  = {0.7f, 0.7f, 0.7f, 1.0f};
  75         float light_diffuse[]  = {2.0f, 2.0f, 2.0f, 1.0f};
  76 #else
  77         float light_ambient[]  = {0.2f, 0.2f, 0.2f, 1.0f};
  78         float light_diffuse[]  = {0.8f, 0.8f, 0.8f, 1.0f};
  79 #endif
  80         float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
  81         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  82         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  83         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  84         glEnable(GL_LIGHT0);
  85         glEnable(GL_LIGHTING);
  86
  87         float material_ambient[]  = {1.0, 1.0, 1.0, 1.0};
  88         float material_diffuse[]  = {1.0, 1.0, 1.0, 1.0};
  89         float material_specular[] = {0.0, 0.0, 0.0, 1.0};
  90         float material_emission[] = {0.0, 0.0, 0.0, 1.0};
  91         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  material_ambient);
  92         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  material_diffuse);
  93         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
  94         glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
  95         glDisable(GL_TEXTURE_2D);
  96         glDisable(GL_COLOR_MATERIAL);
  97
  98         /* Camera 2 */
  99         glTranslatef(0, 0, -elev2rad(elev));
 100         glRotatef(lat, 1, 0, 0);
 101         glRotatef(-lon, 0, 1, 0);
 102
 103         glDisable(GL_ALPHA_TEST);
 104
 105         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 106         glEnable(GL_BLEND);
 107
 108 #ifndef ROAM_DEBUG
 109         glCullFace(GL_BACK);
 110         glEnable(GL_CULL_FACE);
 111
 112         glClearDepth(1.0);
 113         glDepthFunc(GL_LEQUAL);
 114         glEnable(GL_DEPTH_TEST);
 115 #endif
 116
 117         glEnable(GL_LINE_SMOOTH);
 118
 119         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 120         //glShadeModel(GL_FLAT);
 121
 122         g_mutex_lock(opengl->sphere_lock);
 123         roam_sphere_update_view(opengl->sphere);
 124         g_mutex_unlock(opengl->sphere_lock);
 125 }
 126
 127 static gboolean _foreach_object_cb(gpointer key, gpointer value, gpointer pointers)
 128 {
 129         struct RenderLevel *level = value;
 130         GFunc    user_func = ((gpointer*)pointers)[0];
 131         gpointer user_data = ((gpointer*)pointers)[1];
 132         for (GList *cur = level->unsorted.next; cur; cur = cur->next)
 133                 user_func(cur->data, user_data);
 134         for (GList *cur = level->sorted.next;   cur; cur = cur->next)
 135                 user_func(cur->data, user_data);
 136         return FALSE;
 137 }
 138
 139 static void _foreach_object(GritsOpenGL *opengl, GFunc func, gpointer user_data)
 140 {
 141         gpointer pointers[2] = {func, user_data};
 142         g_tree_foreach(opengl->objects, _foreach_object_cb, pointers);
 143 }
 144
 145 static void _add_object(GritsObject *object, GPtrArray *array)
 146 {
 147         g_ptr_array_add(array, object);
 148 }
 149
 150 static GPtrArray *_objects_to_array(GritsOpenGL *opengl)
 151 {
 152         GPtrArray *array = g_ptr_array_new();
 153         _foreach_object(opengl, (GFunc)_add_object, array);
 154         return array;
 155 }
 156
 157 /*************
 158  * Callbacks *
 159  *************/
 160 static gboolean on_configure(GritsOpenGL *opengl, GdkEventConfigure *event, gpointer _)
 161 {
 162         g_debug("GritsOpenGL: on_configure");
 163
 164         double width  = GTK_WIDGET(opengl)->allocation.width;
 165         double height = GTK_WIDGET(opengl)->allocation.height;
 166
 167         /* Setup OpenGL Window */
 168         glViewport(0, 0, width, height);
 169         glMatrixMode(GL_PROJECTION);
 170         glLoadIdentity();
 171         double ang = atan(height/FOV_DIST);
 172         gluPerspective(rad2deg(ang)*2, width/height, 10, 100*EARTH_R);
 173
 174 #ifndef ROAM_DEBUG
 175         g_mutex_lock(opengl->sphere_lock);
 176         roam_sphere_update_errors(opengl->sphere);
 177         g_mutex_unlock(opengl->sphere_lock);
 178 #endif
 179
 180         return FALSE;
 181 }
 182
 183 static gboolean _draw_level(gpointer key, gpointer value, gpointer user_data)
 184 {
 185         g_debug("GritsOpenGL: _draw_level - level=%-4d", (int)key);
 186         GritsOpenGL *opengl = user_data;
 187         struct RenderLevel *level = value;
 188         int nsorted = 0, nunsorted = 0;
 189         GList *cur = NULL;
 190
 191         /* Draw opaque objects without sorting */
 192         glDepthMask(TRUE);
 193         glClear(GL_DEPTH_BUFFER_BIT);
 194         for (cur = level->unsorted.next; cur; cur = cur->next, nunsorted++)
 195                 grits_object_draw(GRITS_OBJECT(cur->data), opengl);
 196
 197         /* Freeze depth buffer and draw transparent objects sorted */
 198         /* TODO: sorting */
 199         //glDepthMask(FALSE);
 200         glAlphaFunc(GL_GREATER, 0.1);
 201         for (cur = level->sorted.next; cur; cur = cur->next, nsorted++)
 202                 grits_object_draw(GRITS_OBJECT(cur->data), opengl);
 203
 204         /* TODO: Prune empty levels */
 205
 206         g_debug("GritsOpenGL: _draw_level - drew %d,%d objects",
 207                         nunsorted, nsorted);
 208         return FALSE;
 209 }
 210
 211 static gboolean on_expose(GritsOpenGL *opengl, GdkEventExpose *event, gpointer _)
 212 {
 213         g_debug("GritsOpenGL: on_expose - begin");
 214
 215         glClear(GL_COLOR_BUFFER_BIT);
 216
 217         _set_visuals(opengl);
 218 #ifdef ROAM_DEBUG
 219         glColor4f(1.0, 1.0, 1.0, 1.0);
 220         glLineWidth(2);
 221         glDisable(GL_TEXTURE_2D);
 222         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 223         roam_sphere_draw(opengl->sphere);
 224         (void)_draw_level;
 225         //roam_sphere_draw_normals(opengl->sphere);
 226 #else
 227         g_mutex_lock(opengl->objects_lock);
 228         g_tree_foreach(opengl->objects, _draw_level, opengl);
 229         if (opengl->wireframe) {
 230                 glClear(GL_DEPTH_BUFFER_BIT);
 231                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 232                 roam_sphere_draw(opengl->sphere);
 233                 g_tree_foreach(opengl->objects, _draw_level, opengl);
 234         }
 235         g_mutex_unlock(opengl->objects_lock);
 236 #endif
 237
 238         gtk_gl_end(GTK_WIDGET(opengl));
 239
 240         g_debug("GritsOpenGL: on_expose - end\n");
 241         return FALSE;
 242 }
 243
 244 static gboolean on_motion_notify(GritsOpenGL *opengl, GdkEventMotion *event, gpointer _)
 245 {
 246         gdouble height = GTK_WIDGET(opengl)->allocation.height;
 247         gdouble gl_x   = event->x;
 248         gdouble gl_y   = height - event->y;
 249
 250         /* Configure view */
 251         gint viewport[4];
 252         gdouble projection[16];
 253         glGetIntegerv(GL_VIEWPORT, viewport);
 254         glGetDoublev(GL_PROJECTION_MATRIX, projection);
 255
 256         glMatrixMode(GL_PROJECTION);
 257         glPushMatrix();
 258         glLoadIdentity();
 259         gluPickMatrix(gl_x, gl_y, 2, 2, viewport);
 260         glMultMatrixd(projection);
 261
 262         /* Prepare for picking */
 263         guint buffer[100][4] = {};
 264         glSelectBuffer(G_N_ELEMENTS(buffer), (guint*)buffer);
 265         glRenderMode(GL_SELECT);
 266         glInitNames();
 267
 268         /* Run picking */
 269         g_mutex_lock(opengl->objects_lock);
 270         GPtrArray *objects = _objects_to_array(opengl);
 271         for (guint i = 0; i < objects->len; i++) {
 272                 glPushName(i);
 273                 GritsObject *object = objects->pdata[i];
 274                 object->state.picked = FALSE;
 275                 grits_object_pick(object, opengl);
 276                 glPopName();
 277         }
 278         int hits = glRenderMode(GL_RENDER);
 279         g_debug("GritsOpenGL: on_motion_notify - hits=%d ev=%.0lf,%.0lf",
 280                         hits, gl_x, gl_y);
 281         for (int i = 0; i < hits; i++) {
 282                 //g_debug("\tHit: %d",     i);
 283                 //g_debug("\t\tcount: %d", buffer[i][0]);
 284                 //g_debug("\t\tz1:    %f", (float)buffer[i][1]/0x7fffffff);
 285                 //g_debug("\t\tz2:    %f", (float)buffer[i][2]/0x7fffffff);
 286                 //g_debug("\t\tname:  %p", (gpointer)buffer[i][3]);
 287                 guint        index  = buffer[i][3];
 288                 GritsObject *object = objects->pdata[index];
 289                 object->state.picked = TRUE;
 290         }
 291         for (guint i = 0; i < objects->len; i++) {
 292                 GritsObject *object = objects->pdata[i];
 293                 grits_object_set_pointer(object, object->state.picked);
 294         }
 295         g_ptr_array_free(objects, TRUE);
 296         g_mutex_unlock(opengl->objects_lock);
 297
 298         /* Cleanup */
 299         glMatrixMode(GL_PROJECTION);
 300         glPopMatrix();
 301
 302         return FALSE;
 303 }
 304
 305 static gboolean on_key_press(GritsOpenGL *opengl, GdkEventKey *event, gpointer _)
 306 {
 307         g_debug("GritsOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 308                         event->keyval, event->state, GDK_plus);
 309
 310         guint kv = event->keyval;
 311         /* Testing */
 312         if (kv == GDK_w) {
 313                 opengl->wireframe = !opengl->wireframe;
 314                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 315         }
 316 #ifdef ROAM_DEBUG
 317         else if (kv == GDK_n) roam_sphere_split_one(opengl->sphere);
 318         else if (kv == GDK_p) roam_sphere_merge_one(opengl->sphere);
 319         else if (kv == GDK_r) roam_sphere_split_merge(opengl->sphere);
 320         else if (kv == GDK_u) roam_sphere_update_errors(opengl->sphere);
 321         gtk_widget_queue_draw(GTK_WIDGET(opengl));
 322 #endif
 323         return FALSE;
 324 }
 325
 326 static gboolean on_chained_event(GritsOpenGL *opengl, GdkEvent *event, gpointer _)
 327 {
 328         _foreach_object(opengl, (GFunc)grits_object_event, event);
 329         return FALSE;
 330 }
 331
 332 static gboolean _update_errors_cb(gpointer _opengl)
 333 {
 334         GritsOpenGL *opengl = _opengl;
 335         g_mutex_lock(opengl->sphere_lock);
 336         roam_sphere_update_errors(opengl->sphere);
 337         g_mutex_unlock(opengl->sphere_lock);
 338         opengl->ue_source = 0;
 339         return FALSE;
 340 }
 341 static void on_view_changed(GritsOpenGL *opengl,
 342                 gdouble _1, gdouble _2, gdouble _3)
 343 {
 344         g_debug("GritsOpenGL: on_view_changed");
 345         _set_visuals(opengl);
 346 #ifndef ROAM_DEBUG
 347         if (!opengl->ue_source)
 348                 opengl->ue_source = g_idle_add_full(G_PRIORITY_HIGH_IDLE+30,
 349                                 _update_errors_cb, opengl, NULL);
 350         //roam_sphere_update_errors(opengl->sphere);
 351 #else
 352         (void)_update_errors_cb;
 353 #endif
 354 }
 355
 356 static gboolean on_idle(GritsOpenGL *opengl)
 357 {
 358         //g_debug("GritsOpenGL: on_idle");
 359         g_mutex_lock(opengl->sphere_lock);
 360         if (roam_sphere_split_merge(opengl->sphere))
 361                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 362         g_mutex_unlock(opengl->sphere_lock);
 363         return TRUE;
 364 }
 365
 366 static void on_realize(GritsOpenGL *opengl, gpointer _)
 367 {
 368         g_debug("GritsOpenGL: on_realize");
 369         gtk_gl_begin(GTK_WIDGET(opengl));
 370
 371         /* Connect signals and idle functions now that opengl is fully initialized */
 372         gtk_widget_add_events(GTK_WIDGET(opengl), GDK_KEY_PRESS_MASK);
 373         g_signal_connect(opengl, "configure-event",  G_CALLBACK(on_configure),    NULL);
 374         g_signal_connect(opengl, "expose-event",     G_CALLBACK(on_expose),       NULL);
 375
 376         g_signal_connect(opengl, "key-press-event",  G_CALLBACK(on_key_press),    NULL);
 377
 378         g_signal_connect(opengl, "location-changed", G_CALLBACK(on_view_changed), NULL);
 379         g_signal_connect(opengl, "rotation-changed", G_CALLBACK(on_view_changed), NULL);
 380
 381         g_signal_connect(opengl, "motion-notify-event", G_CALLBACK(on_motion_notify), NULL);
 382         g_signal_connect_after(opengl, "key-press-event",      G_CALLBACK(on_chained_event), NULL);
 383         g_signal_connect_after(opengl, "key-release-event",    G_CALLBACK(on_chained_event), NULL);
 384         g_signal_connect_after(opengl, "button-press-event",   G_CALLBACK(on_chained_event), NULL);
 385         g_signal_connect_after(opengl, "button-release-event", G_CALLBACK(on_chained_event), NULL);
 386         g_signal_connect_after(opengl, "motion-notify-event",  G_CALLBACK(on_chained_event), NULL);
 387
 388 #ifndef ROAM_DEBUG
 389         opengl->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33,  (GSourceFunc)on_idle, opengl, NULL);
 390         opengl->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, opengl, NULL);
 391 #else
 392         (void)on_idle;
 393         (void)_update_errors_cb;
 394 #endif
 395
 396         /* Re-queue resize incase configure was triggered before realize */
 397         gtk_widget_queue_resize(GTK_WIDGET(opengl));
 398 }
 399
 400 /*********************
 401  * GritsViewer methods *
 402  *********************/
 403 /**
 404  * grits_opengl_new:
 405  * @plugins: the plugins store to use
 406  * @prefs:   the preferences object to use
 407  *
 408  * Create a new OpenGL renderer.
 409  *
 410  * Returns: the new #GritsOpenGL
 411  */
 412 GritsViewer *grits_opengl_new(GritsPlugins *plugins, GritsPrefs *prefs)
 413 {
 414         g_debug("GritsOpenGL: new");
 415         GritsViewer *opengl = g_object_new(GRITS_TYPE_OPENGL, NULL);
 416         grits_viewer_setup(opengl, plugins, prefs);
 417         return opengl;
 418 }
 419
 420 static void grits_opengl_center_position(GritsViewer *_opengl, gdouble lat, gdouble lon, gdouble elev)
 421 {
 422         glRotatef(lon, 0, 1, 0);
 423         glRotatef(-lat, 1, 0, 0);
 424         glTranslatef(0, 0, elev2rad(elev));
 425 }
 426
 427 static void grits_opengl_project(GritsViewer *_opengl,
 428                 gdouble lat, gdouble lon, gdouble elev,
 429                 gdouble *px, gdouble *py, gdouble *pz)
 430 {
 431         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 432         gdouble x, y, z;
 433         lle2xyz(lat, lon, elev, &x, &y, &z);
 434         gluProject(x, y, z,
 435                 opengl->sphere->view->model,
 436                 opengl->sphere->view->proj,
 437                 opengl->sphere->view->view,
 438                 px, py, pz);
 439 }
 440
 441 static void grits_opengl_set_height_func(GritsViewer *_opengl, GritsBounds *bounds,
 442                 RoamHeightFunc height_func, gpointer user_data, gboolean update)
 443 {
 444         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 445         /* TODO: get points? */
 446         g_mutex_lock(opengl->sphere_lock);
 447         GList *triangles = roam_sphere_get_intersect(opengl->sphere, TRUE,
 448                         bounds->n, bounds->s, bounds->e, bounds->w);
 449         for (GList *cur = triangles; cur; cur = cur->next) {
 450                 RoamTriangle *tri = cur->data;
 451                 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
 452                 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 453                         if (bounds->n >= points[i]->lat && points[i]->lat >= bounds->s &&
 454                             bounds->e >= points[i]->lon && points[i]->lon >= bounds->w) {
 455                                 points[i]->height_func = height_func;
 456                                 points[i]->height_data = user_data;
 457                                 roam_point_update_height(points[i]);
 458                         }
 459                 }
 460         }
 461         g_list_free(triangles);
 462         g_mutex_unlock(opengl->sphere_lock);
 463 }
 464
 465 static void _grits_opengl_clear_height_func_rec(RoamTriangle *root)
 466 {
 467         if (!root)
 468                 return;
 469         RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
 470         for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 471                 points[i]->height_func = NULL;
 472                 points[i]->height_data = NULL;
 473                 roam_point_update_height(points[i]);
 474         }
 475         _grits_opengl_clear_height_func_rec(root->kids[0]);
 476         _grits_opengl_clear_height_func_rec(root->kids[1]);
 477 }
 478
 479 static void grits_opengl_clear_height_func(GritsViewer *_opengl)
 480 {
 481         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 482         for (int i = 0; i < G_N_ELEMENTS(opengl->sphere->roots); i++)
 483                 _grits_opengl_clear_height_func_rec(opengl->sphere->roots[i]);
 484 }
 485
 486 static gpointer grits_opengl_add(GritsViewer *_opengl, GritsObject *object,
 487                 gint key, gboolean sort)
 488 {
 489         g_assert(GRITS_IS_OPENGL(_opengl));
 490         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 491         g_mutex_lock(opengl->objects_lock);
 492         struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)key);
 493         if (!level) {
 494                 level = g_new0(struct RenderLevel, 1);
 495                 g_tree_insert(opengl->objects, (gpointer)key, level);
 496         }
 497         GList *list = sort ? &level->sorted : &level->unsorted;
 498         /* Put the link in the list */
 499         GList *link = g_new0(GList, 1);
 500         link->data = object;
 501         link->prev = list;
 502         link->next = list->next;
 503         if (list->next)
 504                 list->next->prev = link;
 505         list->next = link;
 506         g_mutex_unlock(opengl->objects_lock);
 507         return link;
 508 }
 509
 510 static GritsObject *grits_opengl_remove(GritsViewer *_opengl, GritsObject *object)
 511 {
 512         g_assert(GRITS_IS_OPENGL(_opengl));
 513         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 514         GList *link = object->ref;
 515         g_mutex_lock(opengl->objects_lock);
 516         /* Just unlink and free it, link->prev is assured */
 517         link->prev->next = link->next;
 518         if (link->next)
 519                 link->next->prev = link->prev;
 520         g_mutex_unlock(opengl->objects_lock);
 521         object->ref    = NULL;
 522         object->viewer = NULL;
 523         g_free(link);
 524         g_object_unref(object);
 525         return object;
 526 }
 527
 528 /****************
 529  * GObject code *
 530  ****************/
 531 static int _objects_cmp(gconstpointer _a, gconstpointer _b, gpointer _)
 532 {
 533         gint a = (int)_a, b = (int)_b;
 534         return a < b ? -1 :
 535                a > b ?  1 : 0;
 536 }
 537 static void _objects_free(gpointer value)
 538 {
 539         struct RenderLevel *level = value;
 540         if (level->sorted.next)
 541                 g_list_free(level->sorted.next);
 542         if (level->unsorted.next)
 543                 g_list_free(level->unsorted.next);
 544         g_free(level);
 545 }
 546
 547 G_DEFINE_TYPE(GritsOpenGL, grits_opengl, GRITS_TYPE_VIEWER);
 548 static void grits_opengl_init(GritsOpenGL *opengl)
 549 {
 550         g_debug("GritsOpenGL: init");
 551         opengl->objects      = g_tree_new_full(_objects_cmp, NULL, NULL, _objects_free);
 552         opengl->objects_lock = g_mutex_new();
 553         opengl->sphere       = roam_sphere_new(opengl);
 554         opengl->sphere_lock  = g_mutex_new();
 555         gtk_gl_enable(GTK_WIDGET(opengl));
 556         g_signal_connect(opengl, "realize", G_CALLBACK(on_realize), NULL);
 557 }
 558 static void grits_opengl_dispose(GObject *_opengl)
 559 {
 560         g_debug("GritsOpenGL: dispose");
 561         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 562         if (opengl->sm_source[0]) {
 563                 g_source_remove(opengl->sm_source[0]);
 564                 opengl->sm_source[0] = 0;
 565         }
 566         if (opengl->sm_source[1]) {
 567                 g_source_remove(opengl->sm_source[1]);
 568                 opengl->sm_source[1] = 0;
 569         }
 570         if (opengl->ue_source) {
 571                 g_source_remove(opengl->ue_source);
 572                 opengl->ue_source = 0;
 573         }
 574         G_OBJECT_CLASS(grits_opengl_parent_class)->dispose(_opengl);
 575 }
 576 static void grits_opengl_finalize(GObject *_opengl)
 577 {
 578         g_debug("GritsOpenGL: finalize");
 579         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 580         roam_sphere_free(opengl->sphere);
 581         g_tree_destroy(opengl->objects);
 582         g_mutex_free(opengl->objects_lock);
 583         g_mutex_free(opengl->sphere_lock);
 584         G_OBJECT_CLASS(grits_opengl_parent_class)->finalize(_opengl);
 585 }
 586 static void grits_opengl_class_init(GritsOpenGLClass *klass)
 587 {
 588         g_debug("GritsOpenGL: class_init");
 589         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 590         gobject_class->finalize = grits_opengl_finalize;
 591         gobject_class->dispose = grits_opengl_dispose;
 592
 593         GritsViewerClass *viewer_class = GRITS_VIEWER_CLASS(klass);
 594         viewer_class->center_position   = grits_opengl_center_position;
 595         viewer_class->project           = grits_opengl_project;
 596         viewer_class->clear_height_func = grits_opengl_clear_height_func;
 597         viewer_class->set_height_func   = grits_opengl_set_height_func;
 598         viewer_class->add               = grits_opengl_add;
 599         viewer_class->remove            = grits_opengl_remove;
 600 }