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

   1 /*
   2  * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
   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 /* Tessellation, "finding intersecting triangles" */
  19 /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
  20 /* http://www.opengl.org/wiki/Alpha_Blending */
  21
  22 #include <config.h>
  23 #include <math.h>
  24 #include <string.h>
  25 #include <gdk/gdkkeysyms.h>
  26 #include <gtk/gtk.h>
  27 #include <gtk/gtkgl.h>
  28 #include <GL/gl.h>
  29 #include <GL/glu.h>
  30
  31 #include "gis-opengl.h"
  32 #include "gis-util.h"
  33 #include "gis-object.h"
  34 #include "roam.h"
  35
  36 #define FOV_DIST   2000.0
  37 #define MPPX(dist) (4*dist/FOV_DIST)
  38
  39 // #define ROAM_DEBUG
  40
  41 /***********
  42  * Helpers *
  43  ***********/
  44 static void _gis_opengl_begin(GisOpenGL *self)
  45 {
  46         g_assert(GIS_IS_OPENGL(self));
  47
  48         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(self));
  49         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
  50
  51         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
  52                 g_assert_not_reached();
  53 }
  54
  55 static void _gis_opengl_end(GisOpenGL *self)
  56 {
  57         g_assert(GIS_IS_OPENGL(self));
  58         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
  59         gdk_gl_drawable_gl_end(gldrawable);
  60 }
  61
  62
  63 /********************
  64  * Object handleing *
  65  ********************/
  66 static void _draw_marker(GisOpenGL *self, GisMarker *marker)
  67 {
  68         GisPoint *point = gis_object_center(GIS_OBJECT(marker));
  69         gdouble px, py, pz;
  70         gis_viewer_project(GIS_VIEWER(self),
  71                         point->lat, point->lon, point->elev,
  72                         &px, &py, &pz);
  73
  74         g_debug("GisOpenGL: draw_marker - texture=%d", marker->tex);
  75
  76         cairo_surface_t *surface = cairo_get_target(marker->cairo);
  77         gdouble width  = cairo_image_surface_get_width(surface);
  78         gdouble height = cairo_image_surface_get_height(surface);
  79
  80         glMatrixMode(GL_PROJECTION); glLoadIdentity();
  81         glMatrixMode(GL_MODELVIEW);  glLoadIdentity();
  82         glOrtho(0, GTK_WIDGET(self)->allocation.width,
  83                 0, GTK_WIDGET(self)->allocation.height, -1, 1);
  84         glTranslated(px - marker->xoff,
  85                      py - marker->yoff, 0);
  86
  87         glDisable(GL_LIGHTING);
  88         glDisable(GL_COLOR_MATERIAL);
  89         glDisable(GL_DEPTH_TEST);
  90         glEnable(GL_TEXTURE_2D);
  91         glBindTexture(GL_TEXTURE_2D, marker->tex);
  92         g_debug("bind_texture: %d", marker->tex);
  93         glBegin(GL_QUADS);
  94         glTexCoord2f(1, 1); glVertex3f(width, 0     , 0);
  95         glTexCoord2f(1, 0); glVertex3f(width, height, 0);
  96         glTexCoord2f(0, 0); glVertex3f(0    , height, 0);
  97         glTexCoord2f(0, 1); glVertex3f(0    , 0     , 0);
  98         glEnd();
  99 }
 100
 101
 102 static void _draw_objects(GisOpenGL *self)
 103 {
 104         g_debug("GisOpenGL: draw_objects");
 105         /* Draw objects */
 106         for (GList *cur = self->objects; cur; cur = cur->next) {
 107                 glMatrixMode(GL_PROJECTION); glPushMatrix();
 108                 glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 109                 GisObject *object = cur->data;
 110                 switch (object->type) {
 111                 case GIS_TYPE_MARKER:
 112                         _draw_marker(self, GIS_MARKER(object));
 113                         break;
 114                 default:
 115                         break;
 116                 }
 117                 glMatrixMode(GL_PROJECTION); glPopMatrix();
 118                 glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 119         }
 120 }
 121
 122 static void _load_object(GisOpenGL *self, GisObject *object)
 123 {
 124         g_debug("GisOpenGL: load_object");
 125         switch (object->type) {
 126         case GIS_TYPE_MARKER: {
 127                 GisMarker *marker = GIS_MARKER(object);
 128                 cairo_surface_t *surface = cairo_get_target(marker->cairo);
 129                 gdouble width  = cairo_image_surface_get_width(surface);
 130                 gdouble height = cairo_image_surface_get_height(surface);
 131
 132                 _gis_opengl_begin(self);
 133                 glEnable(GL_TEXTURE_2D);
 134                 glGenTextures(1, &marker->tex);
 135                 glBindTexture(GL_TEXTURE_2D, marker->tex);
 136
 137                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 138                 glPixelStorei(GL_PACK_ALIGNMENT, 1);
 139                 glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
 140                                 cairo_image_surface_get_data(surface));
 141                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 142                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 143                 g_debug("load_texture: %d", marker->tex);
 144                 _gis_opengl_end(self);
 145                 break;
 146         }
 147         default:
 148                 break;
 149         }
 150 }
 151
 152 static void _free_object(GisOpenGL *self, GisObject *object)
 153 {
 154         g_debug("GisOpenGL: free_object");
 155         switch (object->type) {
 156         case GIS_TYPE_MARKER: {
 157                 GisMarker *marker = GIS_MARKER(object);
 158                 g_debug("delete_texture: %d", marker->tex);
 159                 glDeleteTextures(1, &marker->tex);
 160                 break;
 161         }
 162         default:
 163                 break;
 164         }
 165 }
 166
 167 /*************
 168  * ROAM Code *
 169  *************/
 170 static void _set_visuals(GisOpenGL *self)
 171 {
 172         glMatrixMode(GL_MODELVIEW);
 173         glLoadIdentity();
 174
 175         /* Camera 1 */
 176         double lat, lon, elev, rx, ry, rz;
 177         gis_viewer_get_location(GIS_VIEWER(self), &lat, &lon, &elev);
 178         gis_viewer_get_rotation(GIS_VIEWER(self), &rx, &ry, &rz);
 179         glRotatef(rx, 1, 0, 0);
 180         glRotatef(rz, 0, 0, 1);
 181
 182         /* Lighting */
 183 #ifdef ROAM_DEBUG
 184         float light_ambient[]  = {0.7f, 0.7f, 0.7f, 1.0f};
 185         float light_diffuse[]  = {2.0f, 2.0f, 2.0f, 1.0f};
 186 #else
 187         float light_ambient[]  = {0.2f, 0.2f, 0.2f, 1.0f};
 188         float light_diffuse[]  = {5.0f, 5.0f, 5.0f, 1.0f};
 189 #endif
 190         float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
 191         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
 192         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
 193         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
 194         glEnable(GL_LIGHT0);
 195         glEnable(GL_LIGHTING);
 196
 197         float material_ambient[]  = {0.2, 0.2, 0.2, 1.0};
 198         float material_diffuse[]  = {0.8, 0.8, 0.8, 1.0};
 199         float material_specular[] = {0.0, 0.0, 0.0, 1.0};
 200         float material_emission[] = {0.0, 0.0, 0.0, 1.0};
 201         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  material_ambient);
 202         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  material_diffuse);
 203         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
 204         glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
 205         glDisable(GL_TEXTURE_2D);
 206         glDisable(GL_COLOR_MATERIAL);
 207
 208         /* Camera 2 */
 209         glTranslatef(0, 0, -elev2rad(elev));
 210         glRotatef(lat, 1, 0, 0);
 211         glRotatef(-lon, 0, 1, 0);
 212
 213         /* Misc */
 214         gdouble rg   = MAX(0, 1-(elev/20000));
 215         gdouble blue = MAX(0, 1-(elev/50000));
 216         glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f);
 217         glColor4f(1, 1, 1, 1);
 218
 219         glDisable(GL_ALPHA_TEST);
 220
 221         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 222         glEnable(GL_BLEND);
 223
 224 #ifndef ROAM_DEBUG
 225         glCullFace(GL_BACK);
 226         glEnable(GL_CULL_FACE);
 227 #endif
 228
 229         glClearDepth(1.0);
 230         glDepthFunc(GL_LEQUAL);
 231         glEnable(GL_DEPTH_TEST);
 232
 233         glEnable(GL_LINE_SMOOTH);
 234
 235         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 236         //glShadeModel(GL_FLAT);
 237
 238         roam_sphere_update_view(self->sphere);
 239 }
 240
 241
 242 /*************
 243  * Callbacks *
 244  *************/
 245 static void on_realize(GisOpenGL *self, gpointer _)
 246 {
 247         g_debug("GisOpenGL: on_realize");
 248         _set_visuals(self);
 249         roam_sphere_update_errors(self->sphere);
 250 }
 251 static gboolean on_configure(GisOpenGL *self, GdkEventConfigure *event, gpointer _)
 252 {
 253         g_debug("GisOpenGL: on_configure");
 254         _gis_opengl_begin(self);
 255
 256         double width  = GTK_WIDGET(self)->allocation.width;
 257         double height = GTK_WIDGET(self)->allocation.height;
 258
 259         /* Setup OpenGL Window */
 260         glViewport(0, 0, width, height);
 261         glMatrixMode(GL_PROJECTION);
 262         glLoadIdentity();
 263         double ang = atan(height/FOV_DIST);
 264         gluPerspective(rad2deg(ang)*2, width/height, 1, 20*EARTH_R);
 265
 266 #ifndef ROAM_DEBUG
 267         roam_sphere_update_errors(self->sphere);
 268 #endif
 269
 270         _gis_opengl_end(self);
 271         return FALSE;
 272 }
 273
 274 static void _on_expose_plugin(GisPlugin *plugin, gchar *name, GisOpenGL *self)
 275 {
 276         _set_visuals(self);
 277         glMatrixMode(GL_PROJECTION); glPushMatrix();
 278         glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 279         gis_plugin_expose(plugin);
 280         glMatrixMode(GL_PROJECTION); glPopMatrix();
 281         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 282 }
 283 static gboolean on_expose(GisOpenGL *self, GdkEventExpose *event, gpointer _)
 284 {
 285         g_debug("GisOpenGL: on_expose - begin");
 286         _gis_opengl_begin(self);
 287
 288         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 289
 290 #ifndef ROAM_DEBUG
 291         gis_plugins_foreach(GIS_VIEWER(self)->plugins,
 292                         G_CALLBACK(_on_expose_plugin), self);
 293         _draw_objects(self);
 294         if (self->wireframe) {
 295                 _set_visuals(self);
 296                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 297                 roam_sphere_draw(self->sphere);
 298         }
 299 #else
 300         _set_visuals(self);
 301         glColor4f(0.0, 0.0, 9.0, 0.6);
 302         glDisable(GL_TEXTURE_2D);
 303         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 304         roam_sphere_draw(self->sphere);
 305         //roam_sphere_draw_normals(self->sphere);
 306 #endif
 307
 308         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 309         gdk_gl_drawable_swap_buffers(gldrawable);
 310
 311         _gis_opengl_end(self);
 312         g_debug("GisOpenGL: on_expose - end\n");
 313         return FALSE;
 314 }
 315
 316 static gboolean on_key_press(GisOpenGL *self, GdkEventKey *event, gpointer _)
 317 {
 318         g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 319                         event->keyval, event->state, GDK_plus);
 320
 321         guint kv = event->keyval;
 322         gdk_threads_leave();
 323         /* Testing */
 324         if (kv == GDK_w) {
 325                 self->wireframe = !self->wireframe;
 326                 gtk_widget_queue_draw(GTK_WIDGET(self));
 327         }
 328 #ifdef ROAM_DEBUG
 329         else if (kv == GDK_n) roam_sphere_split_one(self->sphere);
 330         else if (kv == GDK_p) roam_sphere_merge_one(self->sphere);
 331         else if (kv == GDK_r) roam_sphere_split_merge(self->sphere);
 332         else if (kv == GDK_u) roam_sphere_update_errors(self->sphere);
 333         gdk_threads_enter();
 334         gtk_widget_queue_draw(GTK_WIDGET(self));
 335 #else
 336         gdk_threads_enter();
 337 #endif
 338         return FALSE;
 339 }
 340
 341 static gboolean _update_errors_cb(gpointer sphere)
 342 {
 343         roam_sphere_update_errors(sphere);
 344         return FALSE;
 345 }
 346 static void on_view_changed(GisOpenGL *self,
 347                 gdouble _1, gdouble _2, gdouble _3)
 348 {
 349         g_debug("GisOpenGL: on_view_changed");
 350         gdk_threads_enter();
 351         _gis_opengl_begin(self);
 352         _set_visuals(self);
 353 #ifndef ROAM_DEBUG
 354         g_idle_add_full(G_PRIORITY_HIGH_IDLE+30, _update_errors_cb, self->sphere, NULL);
 355         //roam_sphere_update_errors(self->sphere);
 356 #endif
 357         _gis_opengl_end(self);
 358         gdk_threads_leave();
 359 }
 360
 361 static gboolean on_idle(GisOpenGL *self)
 362 {
 363         //g_debug("GisOpenGL: on_idle");
 364         gdk_threads_enter();
 365         _gis_opengl_begin(self);
 366         if (roam_sphere_split_merge(self->sphere))
 367                 gtk_widget_queue_draw(GTK_WIDGET(self));
 368         _gis_opengl_end(self);
 369         gdk_threads_leave();
 370         return TRUE;
 371 }
 372
 373
 374 /*********************
 375  * GisViewer methods *
 376  *********************/
 377 GisViewer *gis_opengl_new(GisPlugins *plugins)
 378 {
 379         g_debug("GisOpenGL: new");
 380         GisViewer *self = g_object_new(GIS_TYPE_OPENGL, NULL);
 381         self->plugins = plugins;
 382         return self;
 383 }
 384
 385 static void gis_opengl_center_position(GisViewer *_self, gdouble lat, gdouble lon, gdouble elev)
 386 {
 387         GisOpenGL *self = GIS_OPENGL(_self);
 388         glRotatef(lon, 0, 1, 0);
 389         glRotatef(-lat, 1, 0, 0);
 390         glTranslatef(0, 0, elev2rad(elev));
 391 }
 392
 393 static void gis_opengl_project(GisViewer *_self,
 394                 gdouble lat, gdouble lon, gdouble elev,
 395                 gdouble *px, gdouble *py, gdouble *pz)
 396 {
 397         GisOpenGL *self = GIS_OPENGL(_self);
 398         gdouble x, y, z;
 399         lle2xyz(lat, lon, elev, &x, &y, &z);
 400         gluProject(x, y, z,
 401                 self->sphere->view->model,
 402                 self->sphere->view->proj,
 403                 self->sphere->view->view,
 404                 px, py, pz);
 405 }
 406
 407 static void gis_opengl_render_tile(GisViewer *_self, GisTile *tile)
 408 {
 409         GisOpenGL *self = GIS_OPENGL(_self);
 410         if (!tile || !tile->data)
 411                 return;
 412         GList *triangles = roam_sphere_get_intersect(self->sphere,
 413                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 414         if (!triangles)
 415                 g_warning("GisOpenGL: render_tiles - No triangles to draw: edges=%f,%f,%f,%f",
 416                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 417         //g_message("rendering %4d triangles for tile edges=%7.2f,%7.2f,%7.2f,%7.2f",
 418         //              g_list_length(triangles), tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 419         for (GList *cur = triangles; cur; cur = cur->next) {
 420                 RoamTriangle *tri = cur->data;
 421
 422                 gdouble lat[3] = {tri->p.r->lat, tri->p.m->lat, tri->p.l->lat};
 423                 gdouble lon[3] = {tri->p.r->lon, tri->p.m->lon, tri->p.l->lon};
 424
 425                 if (lon[0] < -90 || lon[1] < -90 || lon[2] < -90) {
 426                         if (lon[0] > 90) lon[0] -= 360;
 427                         if (lon[1] > 90) lon[1] -= 360;
 428                         if (lon[2] > 90) lon[2] -= 360;
 429                 }
 430
 431                 gdouble n = tile->edge.n;
 432                 gdouble s = tile->edge.s;
 433                 gdouble e = tile->edge.e;
 434                 gdouble w = tile->edge.w;
 435
 436                 gdouble londist = e - w;
 437                 gdouble latdist = n - s;
 438
 439                 gdouble xy[][3] = {
 440                         {(lon[0]-w)/londist, 1-(lat[0]-s)/latdist},
 441                         {(lon[1]-w)/londist, 1-(lat[1]-s)/latdist},
 442                         {(lon[2]-w)/londist, 1-(lat[2]-s)/latdist},
 443                 };
 444
 445                 glEnable(GL_TEXTURE_2D);
 446                 glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
 447                 glBegin(GL_TRIANGLES);
 448                 glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
 449                 glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
 450                 glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
 451                 glEnd();
 452         }
 453         g_list_free(triangles);
 454 }
 455
 456 static void gis_opengl_render_tiles(GisViewer *_self, GisTile *tile)
 457 {
 458         GisOpenGL *self = GIS_OPENGL(_self);
 459         /* Only render children if possible */
 460         gboolean has_children = TRUE;
 461         GisTile *child;
 462         gis_tile_foreach(tile, child)
 463                 if (!child || !child->data)
 464                         has_children = FALSE;
 465         if (has_children)
 466                 /* Only render children */
 467                 gis_tile_foreach(tile, child)
 468                         gis_opengl_render_tiles(_self, child);
 469         else
 470                 /* No children, render this tile */
 471                 gis_opengl_render_tile(_self, tile);
 472 }
 473
 474 static void gis_opengl_set_height_func(GisViewer *_self, GisTile *tile,
 475                 RoamHeightFunc height_func, gpointer user_data, gboolean update)
 476 {
 477         GisOpenGL *self = GIS_OPENGL(_self);
 478         if (!tile)
 479                 return;
 480         /* TODO: get points? */
 481         GList *triangles = roam_sphere_get_intersect(self->sphere,
 482                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 483         for (GList *cur = triangles; cur; cur = cur->next) {
 484                 RoamTriangle *tri = cur->data;
 485                 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
 486                 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 487                         points[i]->height_func = height_func;
 488                         points[i]->height_data = user_data;
 489                         roam_point_update_height(points[i]);
 490                 }
 491         }
 492         g_list_free(triangles);
 493 }
 494
 495 static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
 496 {
 497         if (!root)
 498                 return;
 499         RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
 500         for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 501                 points[i]->height_func = NULL;
 502                 points[i]->height_data = NULL;
 503                 roam_point_update_height(points[i]);
 504         }
 505         _gis_opengl_clear_height_func_rec(root->kids[0]);
 506         _gis_opengl_clear_height_func_rec(root->kids[1]);
 507 }
 508
 509 static void gis_opengl_clear_height_func(GisViewer *_self)
 510 {
 511         GisOpenGL *self = GIS_OPENGL(_self);
 512         for (int i = 0; i < G_N_ELEMENTS(self->sphere->roots); i++)
 513                 _gis_opengl_clear_height_func_rec(self->sphere->roots[i]);
 514 }
 515
 516 static void gis_opengl_begin(GisViewer *_self)
 517 {
 518         g_assert(GIS_IS_OPENGL(_self));
 519         _gis_opengl_begin(GIS_OPENGL(_self));
 520 }
 521
 522 static void gis_opengl_end(GisViewer *_self)
 523 {
 524         g_assert(GIS_IS_OPENGL(_self));
 525         _gis_opengl_end(GIS_OPENGL(_self));
 526 }
 527
 528 static void gis_opengl_add(GisViewer *_self, GisObject *object)
 529 {
 530         g_assert(GIS_IS_OPENGL(_self));
 531         GisOpenGL *self = GIS_OPENGL(_self);
 532         _load_object(self, object);
 533         self->objects = g_list_prepend(self->objects, object);
 534 }
 535
 536 static void gis_opengl_remove(GisViewer *_self, GisObject *object)
 537 {
 538         g_assert(GIS_IS_OPENGL(_self));
 539         GisOpenGL *self = GIS_OPENGL(_self);
 540         _free_object(self, object);
 541         self->objects = g_list_remove(self->objects, object);
 542 }
 543
 544 /****************
 545  * GObject code *
 546  ****************/
 547 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GIS_TYPE_VIEWER);
 548 static void gis_opengl_init(GisOpenGL *self)
 549 {
 550         g_debug("GisOpenGL: init");
 551         /* OpenGL setup */
 552         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 553                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 554                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 555         if (!glconfig)
 556                 g_error("Failed to create glconfig");
 557         if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
 558                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 559                 g_error("GL lacks required capabilities");
 560         g_object_unref(glconfig);
 561
 562         gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
 563         gtk_widget_set_events(GTK_WIDGET(self),
 564                         GDK_BUTTON_PRESS_MASK |
 565                         GDK_ENTER_NOTIFY_MASK |
 566                         GDK_KEY_PRESS_MASK);
 567         g_object_set(self, "can-focus", TRUE, NULL);
 568
 569         self->sphere = roam_sphere_new(self);
 570
 571 #ifndef ROAM_DEBUG
 572         self->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33,  (GSourceFunc)on_idle, self, NULL);
 573         self->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, self, NULL);
 574 #endif
 575
 576         g_signal_connect(self, "realize",          G_CALLBACK(on_realize),      NULL);
 577         g_signal_connect(self, "configure-event",  G_CALLBACK(on_configure),    NULL);
 578         g_signal_connect(self, "expose-event",     G_CALLBACK(on_expose),       NULL);
 579
 580         g_signal_connect(self, "key-press-event",  G_CALLBACK(on_key_press),    NULL);
 581
 582         g_signal_connect(self, "location-changed", G_CALLBACK(on_view_changed), NULL);
 583         g_signal_connect(self, "rotation-changed", G_CALLBACK(on_view_changed), NULL);
 584 }
 585 static void gis_opengl_dispose(GObject *_self)
 586 {
 587         g_debug("GisOpenGL: dispose");
 588         GisOpenGL *self = GIS_OPENGL(_self);
 589         if (self->sm_source[0]) {
 590                 g_source_remove(self->sm_source[0]);
 591                 self->sm_source[0] = 0;
 592         }
 593         if (self->sm_source[1]) {
 594                 g_source_remove(self->sm_source[1]);
 595                 self->sm_source[1] = 0;
 596         }
 597         if (self->sphere) {
 598                 roam_sphere_free(self->sphere);
 599                 self->sphere = NULL;
 600         }
 601         G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
 602 }
 603 static void gis_opengl_finalize(GObject *_self)
 604 {
 605         g_debug("GisViewer: finalize");
 606         GisOpenGL *self = GIS_OPENGL(_self);
 607         G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
 608 }
 609 static void gis_opengl_class_init(GisOpenGLClass *klass)
 610 {
 611         g_debug("GisOpenGL: class_init");
 612         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 613         gobject_class->dispose     = gis_opengl_dispose;
 614
 615         GisViewerClass *viewer_class = GIS_VIEWER_CLASS(klass);
 616         viewer_class->center_position   = gis_opengl_center_position;
 617         viewer_class->project           = gis_opengl_project;
 618         viewer_class->clear_height_func = gis_opengl_clear_height_func;
 619         viewer_class->set_height_func   = gis_opengl_set_height_func;
 620         viewer_class->render_tile       = gis_opengl_render_tile;
 621         viewer_class->render_tiles      = gis_opengl_render_tiles;
 622         viewer_class->begin             = gis_opengl_begin;
 623         viewer_class->end               = gis_opengl_end;
 624         viewer_class->add               = gis_opengl_add;
 625         viewer_class->remove            = gis_opengl_remove;
 626 }