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 relies on #GtkGlExt and 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 <gtk/gtkgl.h>
  36 #include <GL/gl.h>
  37 #include <GL/glu.h>
  38
  39 #include "grits-opengl.h"
  40 #include "grits-util.h"
  41 #include "roam.h"
  42
  43 static GdkGLConfig *glconfig;
  44
  45 // #define ROAM_DEBUG
  46
  47 /* Tessellation, "finding intersecting triangles" */
  48 /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
  49 /* http://www.opengl.org/wiki/Alpha_Blending */
  50
  51 /* The unsorted/sroted GLists are blank head nodes,
  52  * This way us we can remove objects from the level just by fixing up links
  53  * I.e. we don't need to do a lookup to remove an object if we have its GList */
  54 struct RenderLevel {
  55         GList unsorted;
  56         GList sorted;
  57 };
  58
  59 /***********
  60  * Helpers *
  61  ***********/
  62 static void _set_visuals(GritsOpenGL *opengl)
  63 {
  64         glMatrixMode(GL_MODELVIEW);
  65         glLoadIdentity();
  66
  67         /* Camera 1 */
  68         double lat, lon, elev, rx, ry, rz;
  69         grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
  70         grits_viewer_get_rotation(GRITS_VIEWER(opengl), &rx, &ry, &rz);
  71         glRotatef(rx, 1, 0, 0);
  72         glRotatef(rz, 0, 0, 1);
  73
  74         /* Lighting */
  75 #ifdef ROAM_DEBUG
  76         float light_ambient[]  = {0.7f, 0.7f, 0.7f, 1.0f};
  77         float light_diffuse[]  = {2.0f, 2.0f, 2.0f, 1.0f};
  78 #else
  79         float light_ambient[]  = {0.2f, 0.2f, 0.2f, 1.0f};
  80         float light_diffuse[]  = {0.8f, 0.8f, 0.8f, 1.0f};
  81 #endif
  82         float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
  83         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  84         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  85         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  86         glEnable(GL_LIGHT0);
  87         glEnable(GL_LIGHTING);
  88
  89         float material_ambient[]  = {1.0, 1.0, 1.0, 1.0};
  90         float material_diffuse[]  = {1.0, 1.0, 1.0, 1.0};
  91         float material_specular[] = {0.0, 0.0, 0.0, 1.0};
  92         float material_emission[] = {0.0, 0.0, 0.0, 1.0};
  93         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  material_ambient);
  94         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  material_diffuse);
  95         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
  96         glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
  97         glDisable(GL_TEXTURE_2D);
  98         glDisable(GL_COLOR_MATERIAL);
  99
 100         /* Camera 2 */
 101         glTranslatef(0, 0, -elev2rad(elev));
 102         glRotatef(lat, 1, 0, 0);
 103         glRotatef(-lon, 0, 1, 0);
 104
 105         glDisable(GL_ALPHA_TEST);
 106
 107         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 108         glEnable(GL_BLEND);
 109
 110 #ifndef ROAM_DEBUG
 111         glCullFace(GL_BACK);
 112         glEnable(GL_CULL_FACE);
 113
 114         glClearDepth(1.0);
 115         glDepthFunc(GL_LEQUAL);
 116         glEnable(GL_DEPTH_TEST);
 117 #endif
 118
 119         glEnable(GL_LINE_SMOOTH);
 120
 121         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 122         //glShadeModel(GL_FLAT);
 123
 124         g_mutex_lock(opengl->sphere_lock);
 125         roam_sphere_update_view(opengl->sphere);
 126         g_mutex_unlock(opengl->sphere_lock);
 127 }
 128
 129 static gboolean _foreach_object_cb(gpointer key, gpointer value, gpointer pointers)
 130 {
 131         struct RenderLevel *level = value;
 132         GFunc    user_func = ((gpointer*)pointers)[0];
 133         gpointer user_data = ((gpointer*)pointers)[1];
 134         for (GList *cur = level->unsorted.next; cur; cur = cur->next)
 135                 user_func(cur->data, user_data);
 136         for (GList *cur = level->sorted.next;   cur; cur = cur->next)
 137                 user_func(cur->data, user_data);
 138         return FALSE;
 139 }
 140
 141 static void _foreach_object(GritsOpenGL *opengl, GFunc func, gpointer user_data)
 142 {
 143         gpointer pointers[2] = {func, user_data};
 144         g_tree_foreach(opengl->objects, _foreach_object_cb, pointers);
 145 }
 146
 147 /*************
 148  * Callbacks *
 149  *************/
 150 static gboolean on_configure(GritsOpenGL *opengl, GdkEventConfigure *event, gpointer _)
 151 {
 152         g_debug("GritsOpenGL: on_configure");
 153
 154         double width  = GTK_WIDGET(opengl)->allocation.width;
 155         double height = GTK_WIDGET(opengl)->allocation.height;
 156
 157         /* Setup OpenGL Window */
 158         glViewport(0, 0, width, height);
 159         glMatrixMode(GL_PROJECTION);
 160         glLoadIdentity();
 161         double ang = atan(height/FOV_DIST);
 162         gluPerspective(rad2deg(ang)*2, width/height, 10, 100*EARTH_R);
 163
 164 #ifndef ROAM_DEBUG
 165         g_mutex_lock(opengl->sphere_lock);
 166         roam_sphere_update_errors(opengl->sphere);
 167         g_mutex_unlock(opengl->sphere_lock);
 168 #endif
 169
 170         return FALSE;
 171 }
 172
 173 static gboolean _draw_level(gpointer key, gpointer value, gpointer user_data)
 174 {
 175         g_debug("GritsOpenGL: _draw_level - level=%-4d", (int)key);
 176         GritsOpenGL *opengl = user_data;
 177         struct RenderLevel *level = value;
 178         int nsorted = 0, nunsorted = 0;
 179         GList *cur = NULL;
 180
 181         /* Draw opaque objects without sorting */
 182         glDepthMask(TRUE);
 183         glClear(GL_DEPTH_BUFFER_BIT);
 184         for (cur = level->unsorted.next; cur; cur = cur->next, nunsorted++)
 185                 grits_object_draw(GRITS_OBJECT(cur->data), opengl);
 186
 187         /* Freeze depth buffer and draw transparent objects sorted */
 188         /* TODO: sorting */
 189         //glDepthMask(FALSE);
 190         glAlphaFunc(GL_GREATER, 0.1);
 191         for (cur = level->sorted.next; cur; cur = cur->next, nsorted++)
 192                 grits_object_draw(GRITS_OBJECT(cur->data), opengl);
 193
 194         /* TODO: Prune empty levels */
 195
 196         g_debug("GritsOpenGL: _draw_level - drew %d,%d objects",
 197                         nunsorted, nsorted);
 198         return FALSE;
 199 }
 200
 201 static gboolean on_expose(GritsOpenGL *opengl, GdkEventExpose *event, gpointer _)
 202 {
 203         g_debug("GritsOpenGL: on_expose - begin");
 204
 205         glClear(GL_COLOR_BUFFER_BIT);
 206
 207         _set_visuals(opengl);
 208 #ifdef ROAM_DEBUG
 209         glColor4f(1.0, 1.0, 1.0, 1.0);
 210         glLineWidth(2);
 211         glDisable(GL_TEXTURE_2D);
 212         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 213         roam_sphere_draw(opengl->sphere);
 214         (void)_draw_level;
 215         //roam_sphere_draw_normals(opengl->sphere);
 216 #else
 217         g_mutex_lock(opengl->objects_lock);
 218         g_tree_foreach(opengl->objects, _draw_level, opengl);
 219         if (opengl->wireframe) {
 220                 glClear(GL_DEPTH_BUFFER_BIT);
 221                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 222                 roam_sphere_draw(opengl->sphere);
 223                 g_tree_foreach(opengl->objects, _draw_level, opengl);
 224         }
 225         g_mutex_unlock(opengl->objects_lock);
 226 #endif
 227
 228         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 229         gdk_gl_drawable_swap_buffers(gldrawable);
 230
 231         g_debug("GritsOpenGL: on_expose - end\n");
 232         return FALSE;
 233 }
 234
 235 static gboolean on_motion_notify(GritsOpenGL *opengl, GdkEventMotion *event, gpointer _)
 236 {
 237         gdouble height = GTK_WIDGET(opengl)->allocation.height;
 238         gdouble gl_x   = event->x;
 239         gdouble gl_y   = height - event->y;
 240
 241         /* Configure view */
 242         gint viewport[4];
 243         gdouble projection[16];
 244         glGetIntegerv(GL_VIEWPORT, viewport);
 245         glGetDoublev(GL_PROJECTION_MATRIX, projection);
 246
 247         glMatrixMode(GL_PROJECTION);
 248         glPushMatrix();
 249         glLoadIdentity();
 250         gluPickMatrix(gl_x, gl_y, 2, 2, viewport);
 251         glMultMatrixd(projection);
 252
 253         /* Prepare for picking */
 254         guint buffer[100][4] = {};
 255         glSelectBuffer(G_N_ELEMENTS(buffer), (guint*)buffer);
 256         glRenderMode(GL_SELECT);
 257         glInitNames();
 258
 259         /* Run picking */
 260         g_mutex_lock(opengl->objects_lock);
 261         _foreach_object(opengl, (GFunc)grits_object_pick_begin, opengl);
 262         int hits = glRenderMode(GL_RENDER);
 263         g_debug("GritsOpenGL: on_motion_notify - hits=%d ev=%.0lf,%.0lf",
 264                         hits, gl_x, gl_y);
 265         for (int i = 0; i < hits; i++) {
 266                 //g_debug("\tHit: %d",     i);
 267                 //g_debug("\t\tcount: %d", buffer[i][0]);
 268                 //g_debug("\t\tz1:    %f", (float)buffer[i][1]/0x7fffffff);
 269                 //g_debug("\t\tz2:    %f", (float)buffer[i][2]/0x7fffffff);
 270                 //g_debug("\t\tname:  %p", (gpointer)buffer[i][3]);
 271                 GritsObject *object = GRITS_OBJECT(buffer[i][3]);
 272                 grits_object_pick_pointer(object, gl_x, gl_y);
 273         }
 274         _foreach_object(opengl, (GFunc)grits_object_pick_end, NULL);
 275         g_mutex_unlock(opengl->objects_lock);
 276
 277         /* Cleanup */
 278         glMatrixMode(GL_PROJECTION);
 279         glPopMatrix();
 280
 281         return FALSE;
 282 }
 283
 284 static gboolean on_key_press(GritsOpenGL *opengl, GdkEventKey *event, gpointer _)
 285 {
 286         g_debug("GritsOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 287                         event->keyval, event->state, GDK_plus);
 288
 289         guint kv = event->keyval;
 290         /* Testing */
 291         if (kv == GDK_w) {
 292                 opengl->wireframe = !opengl->wireframe;
 293                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 294         }
 295 #ifdef ROAM_DEBUG
 296         else if (kv == GDK_n) roam_sphere_split_one(opengl->sphere);
 297         else if (kv == GDK_p) roam_sphere_merge_one(opengl->sphere);
 298         else if (kv == GDK_r) roam_sphere_split_merge(opengl->sphere);
 299         else if (kv == GDK_u) roam_sphere_update_errors(opengl->sphere);
 300         gtk_widget_queue_draw(GTK_WIDGET(opengl));
 301 #endif
 302         return FALSE;
 303 }
 304
 305 static gboolean on_chained_event(GritsOpenGL *opengl, GdkEvent *event, gpointer _)
 306 {
 307         _foreach_object(opengl, (GFunc)grits_object_event, event);
 308         return FALSE;
 309 }
 310
 311 static gboolean _update_errors_cb(gpointer _opengl)
 312 {
 313         GritsOpenGL *opengl = _opengl;
 314         g_mutex_lock(opengl->sphere_lock);
 315         roam_sphere_update_errors(opengl->sphere);
 316         g_mutex_unlock(opengl->sphere_lock);
 317         opengl->ue_source = 0;
 318         return FALSE;
 319 }
 320 static void on_view_changed(GritsOpenGL *opengl,
 321                 gdouble _1, gdouble _2, gdouble _3)
 322 {
 323         g_debug("GritsOpenGL: on_view_changed");
 324         _set_visuals(opengl);
 325 #ifndef ROAM_DEBUG
 326         if (!opengl->ue_source)
 327                 opengl->ue_source = g_idle_add_full(G_PRIORITY_HIGH_IDLE+30,
 328                                 _update_errors_cb, opengl, NULL);
 329         //roam_sphere_update_errors(opengl->sphere);
 330 #else
 331         (void)_update_errors_cb;
 332 #endif
 333 }
 334
 335 static gboolean on_idle(GritsOpenGL *opengl)
 336 {
 337         //g_debug("GritsOpenGL: on_idle");
 338         g_mutex_lock(opengl->sphere_lock);
 339         if (roam_sphere_split_merge(opengl->sphere))
 340                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 341         g_mutex_unlock(opengl->sphere_lock);
 342         return TRUE;
 343 }
 344
 345 static void on_realize(GritsOpenGL *opengl, gpointer _)
 346 {
 347         g_debug("GritsOpenGL: on_realize");
 348
 349         /* Start OpenGL */
 350         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(opengl));
 351         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 352         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 353                 g_assert_not_reached();
 354
 355         /* Connect signals and idle functions now that opengl is fully initialized */
 356         gtk_widget_add_events(GTK_WIDGET(opengl), GDK_KEY_PRESS_MASK);
 357         g_signal_connect(opengl, "configure-event",  G_CALLBACK(on_configure),    NULL);
 358         g_signal_connect(opengl, "expose-event",     G_CALLBACK(on_expose),       NULL);
 359
 360         g_signal_connect(opengl, "key-press-event",  G_CALLBACK(on_key_press),    NULL);
 361
 362         g_signal_connect(opengl, "location-changed", G_CALLBACK(on_view_changed), NULL);
 363         g_signal_connect(opengl, "rotation-changed", G_CALLBACK(on_view_changed), NULL);
 364
 365         g_signal_connect(opengl, "motion-notify-event", G_CALLBACK(on_motion_notify), NULL);
 366         g_signal_connect_after(opengl, "key-press-event",      G_CALLBACK(on_chained_event), NULL);
 367         g_signal_connect_after(opengl, "key-release-event",    G_CALLBACK(on_chained_event), NULL);
 368         g_signal_connect_after(opengl, "button-press-event",   G_CALLBACK(on_chained_event), NULL);
 369         g_signal_connect_after(opengl, "button-release-event", G_CALLBACK(on_chained_event), NULL);
 370         g_signal_connect_after(opengl, "motion-notify-event",  G_CALLBACK(on_chained_event), NULL);
 371
 372 #ifndef ROAM_DEBUG
 373         opengl->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33,  (GSourceFunc)on_idle, opengl, NULL);
 374         opengl->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, opengl, NULL);
 375 #else
 376         (void)on_idle;
 377         (void)_update_errors_cb;
 378 #endif
 379
 380         /* Re-queue resize incase configure was triggered before realize */
 381         gtk_widget_queue_resize(GTK_WIDGET(opengl));
 382 }
 383
 384 /*********************
 385  * GritsViewer methods *
 386  *********************/
 387 /**
 388  * grits_opengl_new:
 389  * @plugins: the plugins store to use
 390  * @prefs:   the preferences object to use
 391  *
 392  * Create a new OpenGL renderer.
 393  *
 394  * Returns: the new #GritsOpenGL
 395  */
 396 GritsViewer *grits_opengl_new(GritsPlugins *plugins, GritsPrefs *prefs)
 397 {
 398         g_debug("GritsOpenGL: new");
 399         GritsViewer *opengl = g_object_new(GRITS_TYPE_OPENGL, NULL);
 400         grits_viewer_setup(opengl, plugins, prefs);
 401         return opengl;
 402 }
 403
 404 static void grits_opengl_center_position(GritsViewer *_opengl, gdouble lat, gdouble lon, gdouble elev)
 405 {
 406         glRotatef(lon, 0, 1, 0);
 407         glRotatef(-lat, 1, 0, 0);
 408         glTranslatef(0, 0, elev2rad(elev));
 409 }
 410
 411 static void grits_opengl_project(GritsViewer *_opengl,
 412                 gdouble lat, gdouble lon, gdouble elev,
 413                 gdouble *px, gdouble *py, gdouble *pz)
 414 {
 415         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 416         gdouble x, y, z;
 417         lle2xyz(lat, lon, elev, &x, &y, &z);
 418         gluProject(x, y, z,
 419                 opengl->sphere->view->model,
 420                 opengl->sphere->view->proj,
 421                 opengl->sphere->view->view,
 422                 px, py, pz);
 423 }
 424
 425 static void grits_opengl_set_height_func(GritsViewer *_opengl, GritsBounds *bounds,
 426                 RoamHeightFunc height_func, gpointer user_data, gboolean update)
 427 {
 428         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 429         /* TODO: get points? */
 430         g_mutex_lock(opengl->sphere_lock);
 431         GList *triangles = roam_sphere_get_intersect(opengl->sphere, TRUE,
 432                         bounds->n, bounds->s, bounds->e, bounds->w);
 433         for (GList *cur = triangles; cur; cur = cur->next) {
 434                 RoamTriangle *tri = cur->data;
 435                 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
 436                 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 437                         if (bounds->n >= points[i]->lat && points[i]->lat >= bounds->s &&
 438                             bounds->e >= points[i]->lon && points[i]->lon >= bounds->w) {
 439                                 points[i]->height_func = height_func;
 440                                 points[i]->height_data = user_data;
 441                                 roam_point_update_height(points[i]);
 442                         }
 443                 }
 444         }
 445         g_list_free(triangles);
 446         g_mutex_unlock(opengl->sphere_lock);
 447 }
 448
 449 static void _grits_opengl_clear_height_func_rec(RoamTriangle *root)
 450 {
 451         if (!root)
 452                 return;
 453         RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
 454         for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 455                 points[i]->height_func = NULL;
 456                 points[i]->height_data = NULL;
 457                 roam_point_update_height(points[i]);
 458         }
 459         _grits_opengl_clear_height_func_rec(root->kids[0]);
 460         _grits_opengl_clear_height_func_rec(root->kids[1]);
 461 }
 462
 463 static void grits_opengl_clear_height_func(GritsViewer *_opengl)
 464 {
 465         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 466         for (int i = 0; i < G_N_ELEMENTS(opengl->sphere->roots); i++)
 467                 _grits_opengl_clear_height_func_rec(opengl->sphere->roots[i]);
 468 }
 469
 470 static gpointer grits_opengl_add(GritsViewer *_opengl, GritsObject *object,
 471                 gint key, gboolean sort)
 472 {
 473         g_assert(GRITS_IS_OPENGL(_opengl));
 474         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 475         g_mutex_lock(opengl->objects_lock);
 476         struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)key);
 477         if (!level) {
 478                 level = g_new0(struct RenderLevel, 1);
 479                 g_tree_insert(opengl->objects, (gpointer)key, level);
 480         }
 481         GList *list = sort ? &level->sorted : &level->unsorted;
 482         /* Put the link in the list */
 483         GList *link = g_new0(GList, 1);
 484         link->data = object;
 485         link->prev = list;
 486         link->next = list->next;
 487         if (list->next)
 488                 list->next->prev = link;
 489         list->next = link;
 490         g_mutex_unlock(opengl->objects_lock);
 491         return link;
 492 }
 493
 494 static GritsObject *grits_opengl_remove(GritsViewer *_opengl, GritsObject *object)
 495 {
 496         g_assert(GRITS_IS_OPENGL(_opengl));
 497         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 498         GList *link = object->ref;
 499         g_mutex_lock(opengl->objects_lock);
 500         /* Just unlink and free it, link->prev is assured */
 501         link->prev->next = link->next;
 502         if (link->next)
 503                 link->next->prev = link->prev;
 504         g_mutex_unlock(opengl->objects_lock);
 505         object->ref    = NULL;
 506         object->viewer = NULL;
 507         g_free(link);
 508         g_object_unref(object);
 509         return object;
 510 }
 511
 512 /****************
 513  * GObject code *
 514  ****************/
 515 static int _objects_cmp(gconstpointer _a, gconstpointer _b, gpointer _)
 516 {
 517         gint a = (int)_a, b = (int)_b;
 518         return a < b ? -1 :
 519                a > b ?  1 : 0;
 520 }
 521 static void _objects_free(gpointer value)
 522 {
 523         struct RenderLevel *level = value;
 524         if (level->sorted.next)
 525                 g_list_free(level->sorted.next);
 526         if (level->unsorted.next)
 527                 g_list_free(level->unsorted.next);
 528         g_free(level);
 529 }
 530
 531 G_DEFINE_TYPE(GritsOpenGL, grits_opengl, GRITS_TYPE_VIEWER);
 532 void grits_init(int *argc, char ***argv)
 533 {
 534         glconfig = gdk_gl_config_new_by_mode(
 535                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 536                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 537         if (!glconfig) {
 538                 g_warning("Failed to create glconfig, unsupported:%s%s%s%s.",
 539                         gdk_gl_config_new_by_mode(GDK_GL_MODE_RGBA)   ? "" : " RGBA",
 540                         gdk_gl_config_new_by_mode(GDK_GL_MODE_DEPTH)  ? "" : " DEPTH",
 541                         gdk_gl_config_new_by_mode(GDK_GL_MODE_DOUBLE) ? "" : " DOUBLE",
 542                         gdk_gl_config_new_by_mode(GDK_GL_MODE_ALPHA)  ? "" : " ALPHA");
 543         }
 544 }
 545 static void grits_opengl_init(GritsOpenGL *opengl)
 546 {
 547         g_debug("GritsOpenGL: init");
 548         opengl->objects      = g_tree_new_full(_objects_cmp, NULL, NULL, _objects_free);
 549         opengl->objects_lock = g_mutex_new();
 550         opengl->sphere       = roam_sphere_new(opengl);
 551         opengl->sphere_lock  = g_mutex_new();
 552
 553         /* Set OpenGL before "realize" */
 554         if (!glconfig) {
 555                 g_warning("recreating glconfig");
 556                 glconfig = gdk_gl_config_new_by_mode(
 557                                 GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 558                                 GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 559         }
 560         if (!glconfig)
 561                 g_error("Failed to create glconfig, unsupported:%s%s%s%s.",
 562                         gdk_gl_config_new_by_mode(GDK_GL_MODE_RGBA)   ? "" : " RGBA",
 563                         gdk_gl_config_new_by_mode(GDK_GL_MODE_DEPTH)  ? "" : " DEPTH",
 564                         gdk_gl_config_new_by_mode(GDK_GL_MODE_DOUBLE) ? "" : " DEPTH",
 565                         gdk_gl_config_new_by_mode(GDK_GL_MODE_ALPHA)  ? "" : " ALPHA");
 566         if (!gtk_widget_set_gl_capability(GTK_WIDGET(opengl),
 567                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 568                 g_error("GL lacks required capabilities");
 569
 570         /* Finish OpenGL init after it's realized */
 571         g_signal_connect(opengl, "realize", G_CALLBACK(on_realize), NULL);
 572 }
 573 static void grits_opengl_dispose(GObject *_opengl)
 574 {
 575         g_debug("GritsOpenGL: dispose");
 576         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 577         if (opengl->sm_source[0]) {
 578                 g_source_remove(opengl->sm_source[0]);
 579                 opengl->sm_source[0] = 0;
 580         }
 581         if (opengl->sm_source[1]) {
 582                 g_source_remove(opengl->sm_source[1]);
 583                 opengl->sm_source[1] = 0;
 584         }
 585         if (opengl->ue_source) {
 586                 g_source_remove(opengl->ue_source);
 587                 opengl->ue_source = 0;
 588         }
 589         G_OBJECT_CLASS(grits_opengl_parent_class)->dispose(_opengl);
 590 }
 591 static void grits_opengl_finalize(GObject *_opengl)
 592 {
 593         g_debug("GritsOpenGL: finalize");
 594         GritsOpenGL *opengl = GRITS_OPENGL(_opengl);
 595         roam_sphere_free(opengl->sphere);
 596         g_tree_destroy(opengl->objects);
 597         g_mutex_free(opengl->objects_lock);
 598         g_mutex_free(opengl->sphere_lock);
 599         G_OBJECT_CLASS(grits_opengl_parent_class)->finalize(_opengl);
 600 }
 601 static void grits_opengl_class_init(GritsOpenGLClass *klass)
 602 {
 603         g_debug("GritsOpenGL: class_init");
 604         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 605         gobject_class->finalize = grits_opengl_finalize;
 606         gobject_class->dispose = grits_opengl_dispose;
 607
 608         GritsViewerClass *viewer_class = GRITS_VIEWER_CLASS(klass);
 609         viewer_class->center_position   = grits_opengl_center_position;
 610         viewer_class->project           = grits_opengl_project;
 611         viewer_class->clear_height_func = grits_opengl_clear_height_func;
 612         viewer_class->set_height_func   = grits_opengl_set_height_func;
 613         viewer_class->add               = grits_opengl_add;
 614         viewer_class->remove            = grits_opengl_remove;
 615 }