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  * Object drawing *
  42  ******************/
  43 static void _gis_opengl_draw_triangle(GisOpenGL *self, GisTriangle *tri)
  44 {
  45 }
  46
  47 static void _gis_opengl_draw_quad(GisOpenGL *self, GisQuad *quad)
  48 {
  49 }
  50
  51 static void _gis_opengl_draw_callback(GisOpenGL *self, GisCallback *cb)
  52 {
  53 }
  54
  55 static void _gis_opengl_draw_marker(GisOpenGL *self, GisMarker *marker)
  56 {
  57         GisProjection *proj = (GisProjection*)self->sphere->view;
  58         GisPoint *point = gis_object_center(marker);
  59         gis_point_project(point, proj);
  60
  61         double width  = GTK_WIDGET(self)->allocation.width;
  62         double height = GTK_WIDGET(self)->allocation.height;
  63
  64         cairo_set_source_rgba(self->canvas, 1, 1, 1, 1);
  65         cairo_arc(self->canvas, point->px, height-point->py, 4, 0, 2*G_PI);
  66         cairo_fill(self->canvas);
  67         cairo_move_to(self->canvas, point->px+4, height-point->py-8);
  68         cairo_set_font_size(self->canvas, 10);
  69         cairo_show_text(self->canvas, marker->label);
  70 }
  71
  72 static void gis_opengl_draw_object(GisOpenGL *self, GisObject *object)
  73 {
  74         g_debug("GisOpenGL: draw_object - Drawing object of type %d", object->type);
  75         switch (object->type) {
  76         case GIS_TYPE_TRIANGLE: _gis_opengl_draw_triangle(self, GIS_TRIANGLE(object)); break;
  77         case GIS_TYPE_QUAD    : _gis_opengl_draw_quad    (self, GIS_QUAD    (object)); break;
  78         case GIS_TYPE_CALLBACK: _gis_opengl_draw_callback(self, GIS_CALLBACK(object)); break;
  79         case GIS_TYPE_MARKER  : _gis_opengl_draw_marker  (self, GIS_MARKER  (object)); break;
  80         default: g_warning("GisOpenGL: draw_object - invalid type %d", object->type);
  81         }
  82 }
  83 static void gis_opengl_draw_objects(GisOpenGL *self)
  84 {
  85         g_debug("GisOpenGL: draw_objects");
  86
  87         double width  = GTK_WIDGET(self)->allocation.width;
  88         double height = GTK_WIDGET(self)->allocation.height;
  89         cairo_surface_t *surface = cairo_get_target(self->canvas);
  90         int stride = cairo_image_surface_get_stride(surface);
  91         guchar *data = cairo_image_surface_get_data(surface);
  92         memset(data, 0, height*stride);
  93
  94         /* Draw objects */
  95         for (GList *cur = GIS_VIEWER(self)->objects; cur; cur = cur->next)
  96                 gis_opengl_draw_object(self, cur->data);
  97
  98         /* Copy canvas to opengl */
  99         glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity();
 100         glMatrixMode(GL_MODELVIEW);  glPushMatrix(); glLoadIdentity();
 101         glDisable(GL_CULL_FACE);
 102         glDisable(GL_DEPTH_TEST);
 103         glDisable(GL_LIGHTING);
 104         glDisable(GL_COLOR_MATERIAL);
 105         glEnable(GL_TEXTURE_2D);
 106         glBindTexture(GL_TEXTURE_2D, self->canvas_tex);
 107         //glTexSubImage2D(GL_TEXTURE_2D, 0, 0,0, width,height,
 108         //              GL_RGBA, GL_UNSIGNED_BYTE, data);
 109         glBegin(GL_QUADS);
 110         glTexCoord2d(0, 0); glVertex3f(-1,  1, 1);
 111         glTexCoord2d(1, 0); glVertex3f( 1,  1, 1);
 112         glTexCoord2d(1, 1); glVertex3f( 1, -1, 1);
 113         glTexCoord2d(0, 1); glVertex3f(-1, -1, 1);
 114         glEnd();
 115         glMatrixMode(GL_PROJECTION); glPopMatrix();
 116         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 117 }
 118
 119
 120 /***********
 121  * Helpers *
 122  ***********/
 123 static void _gis_opengl_begin(GisOpenGL *self)
 124 {
 125         g_assert(GIS_IS_OPENGL(self));
 126
 127         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(self));
 128         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 129
 130         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 131                 g_assert_not_reached();
 132 }
 133
 134 static void _gis_opengl_end(GisOpenGL *self)
 135 {
 136         g_assert(GIS_IS_OPENGL(self));
 137         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 138         gdk_gl_drawable_gl_end(gldrawable);
 139 }
 140
 141 /*************
 142  * ROAM Code *
 143  *************/
 144 static void _set_visuals(GisOpenGL *self)
 145 {
 146         glMatrixMode(GL_MODELVIEW);
 147         glLoadIdentity();
 148
 149         /* Camera 1 */
 150         double lat, lon, elev, rx, ry, rz;
 151         gis_viewer_get_location(GIS_VIEWER(self), &lat, &lon, &elev);
 152         gis_viewer_get_rotation(GIS_VIEWER(self), &rx, &ry, &rz);
 153         glRotatef(rx, 1, 0, 0);
 154         glRotatef(rz, 0, 0, 1);
 155
 156         /* Lighting */
 157 #ifdef ROAM_DEBUG
 158         float light_ambient[]  = {0.7f, 0.7f, 0.7f, 1.0f};
 159         float light_diffuse[]  = {2.0f, 2.0f, 2.0f, 1.0f};
 160 #else
 161         float light_ambient[]  = {0.2f, 0.2f, 0.2f, 1.0f};
 162         float light_diffuse[]  = {5.0f, 5.0f, 5.0f, 1.0f};
 163 #endif
 164         float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
 165         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
 166         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
 167         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
 168         glEnable(GL_LIGHT0);
 169         glEnable(GL_LIGHTING);
 170
 171         float material_ambient[]  = {0.2, 0.2, 0.2, 1.0};
 172         float material_diffuse[]  = {0.8, 0.8, 0.8, 1.0};
 173         float material_specular[] = {0.0, 0.0, 0.0, 1.0};
 174         float material_emission[] = {0.0, 0.0, 0.0, 1.0};
 175         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  material_ambient);
 176         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  material_diffuse);
 177         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
 178         glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
 179         glDisable(GL_TEXTURE_2D);
 180         glDisable(GL_COLOR_MATERIAL);
 181
 182         /* Camera 2 */
 183         glTranslatef(0, 0, -elev2rad(elev));
 184         glRotatef(lat, 1, 0, 0);
 185         glRotatef(-lon, 0, 1, 0);
 186
 187         /* Misc */
 188         gdouble rg   = MAX(0, 1-(elev/20000));
 189         gdouble blue = MAX(0, 1-(elev/50000));
 190         glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f);
 191         glColor4f(1, 1, 1, 1);
 192
 193         glDisable(GL_ALPHA_TEST);
 194
 195         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 196         glEnable(GL_BLEND);
 197
 198 #ifndef ROAM_DEBUG
 199         glCullFace(GL_BACK);
 200         glEnable(GL_CULL_FACE);
 201 #endif
 202
 203         glClearDepth(1.0);
 204         glDepthFunc(GL_LEQUAL);
 205         glEnable(GL_DEPTH_TEST);
 206
 207         glEnable(GL_LINE_SMOOTH);
 208
 209         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 210         //glShadeModel(GL_FLAT);
 211
 212         roam_sphere_update_view(self->sphere);
 213 }
 214
 215
 216 /*************
 217  * Callbacks *
 218  *************/
 219 static void on_realize(GisOpenGL *self, gpointer _)
 220 {
 221         g_debug("GisOpenGL: on_realize");
 222         _set_visuals(self);
 223         roam_sphere_update_errors(self->sphere);
 224 }
 225 static gboolean on_configure(GisOpenGL *self, GdkEventConfigure *event, gpointer _)
 226 {
 227         g_debug("GisOpenGL: on_configure");
 228         _gis_opengl_begin(self);
 229
 230         double width  = GTK_WIDGET(self)->allocation.width;
 231         double height = GTK_WIDGET(self)->allocation.height;
 232
 233         /* Setup OpenGL Window */
 234         glViewport(0, 0, width, height);
 235         glMatrixMode(GL_PROJECTION);
 236         glLoadIdentity();
 237         double ang = atan(height/FOV_DIST);
 238         gluPerspective(rad2deg(ang)*2, width/height, 1, 20*EARTH_R);
 239
 240         /* Recreate the canvas */
 241         if (self->canvas) {
 242                 cairo_surface_destroy(cairo_get_target(self->canvas));
 243                 cairo_destroy(self->canvas);
 244                 glDeleteTextures(1, &self->canvas_tex);
 245         }
 246         g_message("creating %fx%f canvas", width, height);
 247         cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
 248         self->canvas = cairo_create(surface);
 249         glEnable(GL_TEXTURE_2D);
 250         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 251         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 252         glGenTextures(1, &self->canvas_tex);
 253         glBindTexture(GL_TEXTURE_2D, self->canvas_tex);
 254         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
 255                         cairo_image_surface_get_data(cairo_get_target(self->canvas)));
 256         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 257         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 258
 259
 260 #ifndef ROAM_DEBUG
 261         roam_sphere_update_errors(self->sphere);
 262 #endif
 263
 264         _gis_opengl_end(self);
 265         return FALSE;
 266 }
 267
 268 static void _on_expose_plugin(GisPlugin *plugin, gchar *name, GisOpenGL *self)
 269 {
 270         _set_visuals(self);
 271         glMatrixMode(GL_PROJECTION); glPushMatrix();
 272         glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 273         gis_plugin_expose(plugin);
 274         glMatrixMode(GL_PROJECTION); glPopMatrix();
 275         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 276 }
 277 static gboolean on_expose(GisOpenGL *self, GdkEventExpose *event, gpointer _)
 278 {
 279         g_debug("GisOpenGL: on_expose - begin");
 280         _gis_opengl_begin(self);
 281
 282         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 283
 284 #ifndef ROAM_DEBUG
 285         gis_plugins_foreach(GIS_VIEWER(self)->plugins,
 286                         G_CALLBACK(_on_expose_plugin), self);
 287         gis_opengl_draw_objects(self);
 288         if (self->wireframe) {
 289                 _set_visuals(self);
 290                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 291                 roam_sphere_draw(self->sphere);
 292         }
 293 #else
 294         _set_visuals(self);
 295         glColor4f(0.0, 0.0, 9.0, 0.6);
 296         glDisable(GL_TEXTURE_2D);
 297         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 298         roam_sphere_draw(self->sphere);
 299         //roam_sphere_draw_normals(self->sphere);
 300 #endif
 301
 302         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
 303         gdk_gl_drawable_swap_buffers(gldrawable);
 304
 305         _gis_opengl_end(self);
 306         g_debug("GisOpenGL: on_expose - end\n");
 307         return FALSE;
 308 }
 309
 310 static gboolean on_key_press(GisOpenGL *self, GdkEventKey *event, gpointer _)
 311 {
 312         g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 313                         event->keyval, event->state, GDK_plus);
 314
 315         guint kv = event->keyval;
 316         gdk_threads_leave();
 317         /* Testing */
 318         if (kv == GDK_w) {
 319                 self->wireframe = !self->wireframe;
 320                 gtk_widget_queue_draw(GTK_WIDGET(self));
 321         }
 322 #ifdef ROAM_DEBUG
 323         else if (kv == GDK_n) roam_sphere_split_one(self->sphere);
 324         else if (kv == GDK_p) roam_sphere_merge_one(self->sphere);
 325         else if (kv == GDK_r) roam_sphere_split_merge(self->sphere);
 326         else if (kv == GDK_u) roam_sphere_update_errors(self->sphere);
 327         gdk_threads_enter();
 328         gtk_widget_queue_draw(GTK_WIDGET(self));
 329 #else
 330         gdk_threads_enter();
 331 #endif
 332         return FALSE;
 333 }
 334
 335 static gboolean _update_errors_cb(gpointer sphere)
 336 {
 337         roam_sphere_update_errors(sphere);
 338         return FALSE;
 339 }
 340 static void on_view_changed(GisOpenGL *self,
 341                 gdouble _1, gdouble _2, gdouble _3)
 342 {
 343         g_debug("GisOpenGL: on_view_changed");
 344         gdk_threads_enter();
 345         _gis_opengl_begin(self);
 346         _set_visuals(self);
 347 #ifndef ROAM_DEBUG
 348         g_idle_add_full(G_PRIORITY_HIGH_IDLE+30, _update_errors_cb, self->sphere, NULL);
 349         //roam_sphere_update_errors(self->sphere);
 350 #endif
 351         _gis_opengl_end(self);
 352         gdk_threads_leave();
 353 }
 354
 355 static gboolean on_idle(GisOpenGL *self)
 356 {
 357         //g_debug("GisOpenGL: on_idle");
 358         gdk_threads_enter();
 359         _gis_opengl_begin(self);
 360         if (roam_sphere_split_merge(self->sphere))
 361                 gtk_widget_queue_draw(GTK_WIDGET(self));
 362         _gis_opengl_end(self);
 363         gdk_threads_leave();
 364         return TRUE;
 365 }
 366
 367
 368 /*********************
 369  * GisViewer methods *
 370  *********************/
 371 GisViewer *gis_opengl_new(GisPlugins *plugins)
 372 {
 373         g_debug("GisOpenGL: new");
 374         GisViewer *self = g_object_new(GIS_TYPE_OPENGL, NULL);
 375         self->plugins = plugins;
 376         return self;
 377 }
 378
 379 static void gis_opengl_center_position(GisViewer *_self, gdouble lat, gdouble lon, gdouble elev)
 380 {
 381         GisOpenGL *self = GIS_OPENGL(_self);
 382         glRotatef(lon, 0, 1, 0);
 383         glRotatef(-lat, 1, 0, 0);
 384         glTranslatef(0, 0, elev2rad(elev));
 385 }
 386
 387 static void gis_opengl_project(GisViewer *_self,
 388                 gdouble lat, gdouble lon, gdouble elev,
 389                 gdouble *px, gdouble *py, gdouble *pz)
 390 {
 391         GisOpenGL *self = GIS_OPENGL(_self);
 392         gdouble x, y, z;
 393         lle2xyz(lat, lon, elev, &x, &y, &z);
 394         gluProject(x, y, z,
 395                 self->sphere->view->model,
 396                 self->sphere->view->proj,
 397                 self->sphere->view->view,
 398                 px, py, pz);
 399 }
 400
 401 static void gis_opengl_render_tile(GisViewer *_self, GisTile *tile)
 402 {
 403         GisOpenGL *self = GIS_OPENGL(_self);
 404         if (!tile || !tile->data)
 405                 return;
 406         GList *triangles = roam_sphere_get_intersect(self->sphere,
 407                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 408         if (!triangles)
 409                 g_warning("GisOpenGL: render_tiles - No triangles to draw: edges=%f,%f,%f,%f",
 410                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 411         //g_message("rendering %4d triangles for tile edges=%7.2f,%7.2f,%7.2f,%7.2f",
 412         //              g_list_length(triangles), tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 413         for (GList *cur = triangles; cur; cur = cur->next) {
 414                 RoamTriangle *tri = cur->data;
 415
 416                 gdouble lat[3] = {tri->p.r->lat, tri->p.m->lat, tri->p.l->lat};
 417                 gdouble lon[3] = {tri->p.r->lon, tri->p.m->lon, tri->p.l->lon};
 418
 419                 if (lon[0] < -90 || lon[1] < -90 || lon[2] < -90) {
 420                         if (lon[0] > 90) lon[0] -= 360;
 421                         if (lon[1] > 90) lon[1] -= 360;
 422                         if (lon[2] > 90) lon[2] -= 360;
 423                 }
 424
 425                 gdouble n = tile->edge.n;
 426                 gdouble s = tile->edge.s;
 427                 gdouble e = tile->edge.e;
 428                 gdouble w = tile->edge.w;
 429
 430                 gdouble londist = e - w;
 431                 gdouble latdist = n - s;
 432
 433                 gdouble xy[][3] = {
 434                         {(lon[0]-w)/londist, 1-(lat[0]-s)/latdist},
 435                         {(lon[1]-w)/londist, 1-(lat[1]-s)/latdist},
 436                         {(lon[2]-w)/londist, 1-(lat[2]-s)/latdist},
 437                 };
 438
 439                 glEnable(GL_TEXTURE_2D);
 440                 glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
 441                 glBegin(GL_TRIANGLES);
 442                 glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
 443                 glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
 444                 glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
 445                 glEnd();
 446         }
 447         g_list_free(triangles);
 448 }
 449
 450 static void gis_opengl_render_tiles(GisViewer *_self, GisTile *tile)
 451 {
 452         GisOpenGL *self = GIS_OPENGL(_self);
 453         /* Only render children if possible */
 454         gboolean has_children = TRUE;
 455         GisTile *child;
 456         gis_tile_foreach(tile, child)
 457                 if (!child || !child->data)
 458                         has_children = FALSE;
 459         if (has_children)
 460                 /* Only render children */
 461                 gis_tile_foreach(tile, child)
 462                         gis_opengl_render_tiles(_self, child);
 463         else
 464                 /* No children, render this tile */
 465                 gis_opengl_render_tile(_self, tile);
 466 }
 467
 468 static void gis_opengl_set_height_func(GisViewer *_self, GisTile *tile,
 469                 RoamHeightFunc height_func, gpointer user_data, gboolean update)
 470 {
 471         GisOpenGL *self = GIS_OPENGL(_self);
 472         if (!tile)
 473                 return;
 474         /* TODO: get points? */
 475         GList *triangles = roam_sphere_get_intersect(self->sphere,
 476                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 477         for (GList *cur = triangles; cur; cur = cur->next) {
 478                 RoamTriangle *tri = cur->data;
 479                 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
 480                 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 481                         points[i]->height_func = height_func;
 482                         points[i]->height_data = user_data;
 483                         roam_point_update_height(points[i]);
 484                 }
 485         }
 486         g_list_free(triangles);
 487 }
 488
 489 static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
 490 {
 491         if (!root)
 492                 return;
 493         RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
 494         for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 495                 points[i]->height_func = NULL;
 496                 points[i]->height_data = NULL;
 497                 roam_point_update_height(points[i]);
 498         }
 499         _gis_opengl_clear_height_func_rec(root->kids[0]);
 500         _gis_opengl_clear_height_func_rec(root->kids[1]);
 501 }
 502
 503 static void gis_opengl_clear_height_func(GisViewer *_self)
 504 {
 505         GisOpenGL *self = GIS_OPENGL(_self);
 506         for (int i = 0; i < G_N_ELEMENTS(self->sphere->roots); i++)
 507                 _gis_opengl_clear_height_func_rec(self->sphere->roots[i]);
 508 }
 509
 510 static void gis_opengl_begin(GisViewer *_self)
 511 {
 512         g_assert(GIS_IS_OPENGL(_self));
 513         _gis_opengl_begin(GIS_OPENGL(_self));
 514 }
 515
 516 static void gis_opengl_end(GisViewer *_self)
 517 {
 518         g_assert(GIS_IS_OPENGL(_self));
 519         _gis_opengl_end(GIS_OPENGL(_self));
 520 }
 521
 522 /****************
 523  * GObject code *
 524  ****************/
 525 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GIS_TYPE_VIEWER);
 526 static void gis_opengl_init(GisOpenGL *self)
 527 {
 528         g_debug("GisOpenGL: init");
 529         /* OpenGL setup */
 530         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 531                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 532                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 533         if (!glconfig)
 534                 g_error("Failed to create glconfig");
 535         if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
 536                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 537                 g_error("GL lacks required capabilities");
 538         g_object_unref(glconfig);
 539
 540         gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
 541         gtk_widget_set_events(GTK_WIDGET(self),
 542                         GDK_BUTTON_PRESS_MASK |
 543                         GDK_ENTER_NOTIFY_MASK |
 544                         GDK_KEY_PRESS_MASK);
 545         g_object_set(self, "can-focus", TRUE, NULL);
 546
 547         self->sphere = roam_sphere_new(self);
 548
 549 #ifndef ROAM_DEBUG
 550         self->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33,  (GSourceFunc)on_idle, self, NULL);
 551         self->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, self, NULL);
 552 #endif
 553
 554         g_signal_connect(self, "realize",          G_CALLBACK(on_realize),      NULL);
 555         g_signal_connect(self, "configure-event",  G_CALLBACK(on_configure),    NULL);
 556         g_signal_connect(self, "expose-event",     G_CALLBACK(on_expose),       NULL);
 557
 558         g_signal_connect(self, "key-press-event",  G_CALLBACK(on_key_press),    NULL);
 559
 560         g_signal_connect(self, "location-changed", G_CALLBACK(on_view_changed), NULL);
 561         g_signal_connect(self, "rotation-changed", G_CALLBACK(on_view_changed), NULL);
 562 }
 563 static void gis_opengl_dispose(GObject *_self)
 564 {
 565         g_debug("GisOpenGL: dispose");
 566         GisOpenGL *self = GIS_OPENGL(_self);
 567         if (self->sm_source[0]) {
 568                 g_source_remove(self->sm_source[0]);
 569                 self->sm_source[0] = 0;
 570         }
 571         if (self->sm_source[1]) {
 572                 g_source_remove(self->sm_source[1]);
 573                 self->sm_source[1] = 0;
 574         }
 575         if (self->sphere) {
 576                 roam_sphere_free(self->sphere);
 577                 self->sphere = NULL;
 578         }
 579         G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
 580 }
 581 static void gis_opengl_finalize(GObject *_self)
 582 {
 583         g_debug("GisViewer: finalize");
 584         GisOpenGL *self = GIS_OPENGL(_self);
 585         if (self->canvas) {
 586                 cairo_surface_destroy(cairo_get_target(self->canvas));
 587                 cairo_destroy(self->canvas);
 588                 self->canvas = NULL;
 589         }
 590         G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
 591 }
 592 static void gis_opengl_class_init(GisOpenGLClass *klass)
 593 {
 594         g_debug("GisOpenGL: class_init");
 595         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 596         gobject_class->dispose     = gis_opengl_dispose;
 597
 598         GisViewerClass *viewer_class = GIS_VIEWER_CLASS(klass);
 599         viewer_class->center_position   = gis_opengl_center_position;
 600         viewer_class->project           = gis_opengl_project;
 601         viewer_class->clear_height_func = gis_opengl_clear_height_func;
 602         viewer_class->set_height_func   = gis_opengl_set_height_func;
 603         viewer_class->render_tile       = gis_opengl_render_tile;
 604         viewer_class->render_tiles      = gis_opengl_render_tiles;
 605         viewer_class->begin             = gis_opengl_begin;
 606         viewer_class->end               = gis_opengl_end;
 607 }