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