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

   1 /*
   2  * Copyright (C) 2009-2010 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 /* 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 "roam.h"
  34
  35 #include "objects/gis-object.h"
  36 #include "objects/gis-marker.h"
  37 #include "objects/gis-callback.h"
  38
  39 #define FOV_DIST   2000.0
  40 #define MPPX(dist) (4*dist/FOV_DIST)
  41
  42 // #define ROAM_DEBUG
  43
  44 /***********
  45  * Helpers *
  46  ***********/
  47 static void _set_visuals(GisOpenGL *opengl)
  48 {
  49         glMatrixMode(GL_MODELVIEW);
  50         glLoadIdentity();
  51
  52         /* Camera 1 */
  53         double lat, lon, elev, rx, ry, rz;
  54         gis_viewer_get_location(GIS_VIEWER(opengl), &lat, &lon, &elev);
  55         gis_viewer_get_rotation(GIS_VIEWER(opengl), &rx, &ry, &rz);
  56         glRotatef(rx, 1, 0, 0);
  57         glRotatef(rz, 0, 0, 1);
  58
  59         /* Lighting */
  60 #ifdef ROAM_DEBUG
  61         float light_ambient[]  = {0.7f, 0.7f, 0.7f, 1.0f};
  62         float light_diffuse[]  = {2.0f, 2.0f, 2.0f, 1.0f};
  63 #else
  64         float light_ambient[]  = {0.2f, 0.2f, 0.2f, 1.0f};
  65         float light_diffuse[]  = {5.0f, 5.0f, 5.0f, 1.0f};
  66 #endif
  67         float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
  68         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  69         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  70         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  71         glEnable(GL_LIGHT0);
  72         glEnable(GL_LIGHTING);
  73
  74         float material_ambient[]  = {0.2, 0.2, 0.2, 1.0};
  75         float material_diffuse[]  = {0.8, 0.8, 0.8, 1.0};
  76         float material_specular[] = {0.1, 0.1, 0.1, 1.0};
  77         float material_emission[] = {0.0, 0.0, 0.0, 1.0};
  78         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  material_ambient);
  79         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  material_diffuse);
  80         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
  81         glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
  82         glDisable(GL_TEXTURE_2D);
  83         glDisable(GL_COLOR_MATERIAL);
  84
  85         /* Camera 2 */
  86         glTranslatef(0, 0, -elev2rad(elev));
  87         glRotatef(lat, 1, 0, 0);
  88         glRotatef(-lon, 0, 1, 0);
  89
  90         glDisable(GL_ALPHA_TEST);
  91
  92         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  93         glEnable(GL_BLEND);
  94
  95 #ifndef ROAM_DEBUG
  96         glCullFace(GL_BACK);
  97         glEnable(GL_CULL_FACE);
  98 #endif
  99
 100         glClearDepth(1.0);
 101         glDepthFunc(GL_LEQUAL);
 102         glEnable(GL_DEPTH_TEST);
 103
 104         glEnable(GL_LINE_SMOOTH);
 105
 106         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 107         //glShadeModel(GL_FLAT);
 108
 109         roam_sphere_update_view(opengl->sphere);
 110 }
 111
 112
 113 /********************
 114  * Object handleing *
 115  ********************/
 116 static void _draw_tile(GisOpenGL *opengl, GisTile *tile)
 117 {
 118         if (!tile || !tile->data)
 119                 return;
 120         GList *triangles = roam_sphere_get_intersect(opengl->sphere, FALSE,
 121                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 122         if (!triangles)
 123                 g_warning("GisOpenGL: _draw_tiles - No triangles to draw: edges=%f,%f,%f,%f",
 124                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 125         //g_message("drawing %4d triangles for tile edges=%7.2f,%7.2f,%7.2f,%7.2f",
 126         //              g_list_length(triangles), tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 127         for (GList *cur = triangles; cur; cur = cur->next) {
 128                 RoamTriangle *tri = cur->data;
 129
 130                 gdouble lat[3] = {tri->p.r->lat, tri->p.m->lat, tri->p.l->lat};
 131                 gdouble lon[3] = {tri->p.r->lon, tri->p.m->lon, tri->p.l->lon};
 132
 133                 if (lon[0] < -90 || lon[1] < -90 || lon[2] < -90) {
 134                         if (lon[0] > 90) lon[0] -= 360;
 135                         if (lon[1] > 90) lon[1] -= 360;
 136                         if (lon[2] > 90) lon[2] -= 360;
 137                 }
 138
 139                 gdouble n = tile->edge.n;
 140                 gdouble s = tile->edge.s;
 141                 gdouble e = tile->edge.e;
 142                 gdouble w = tile->edge.w;
 143
 144                 gdouble londist = e - w;
 145                 gdouble latdist = n - s;
 146
 147                 gdouble xy[3][2] = {
 148                         {(lon[0]-w)/londist, 1-(lat[0]-s)/latdist},
 149                         {(lon[1]-w)/londist, 1-(lat[1]-s)/latdist},
 150                         {(lon[2]-w)/londist, 1-(lat[2]-s)/latdist},
 151                 };
 152
 153                 //if ((lat[0] == 90 && (xy[0][0] < 0 || xy[0][0] > 1)) ||
 154                 //    (lat[1] == 90 && (xy[1][0] < 0 || xy[1][0] > 1)) ||
 155                 //    (lat[2] == 90 && (xy[2][0] < 0 || xy[2][0] > 1)))
 156                 //      g_message("w,e=%4.f,%4.f   "
 157                 //                "lat,lon,x,y="
 158                 //                "%4.1f,%4.0f,%4.2f,%4.2f   "
 159                 //                "%4.1f,%4.0f,%4.2f,%4.2f   "
 160                 //                "%4.1f,%4.0f,%4.2f,%4.2f   ",
 161                 //              w,e,
 162                 //              lat[0], lon[0], xy[0][0], xy[0][1],
 163                 //              lat[1], lon[1], xy[1][0], xy[1][1],
 164                 //              lat[2], lon[2], xy[2][0], xy[2][1]);
 165
 166                 /* Fix poles */
 167                 if (lat[0] == 90 || lat[0] == -90) xy[0][0] = 0.5;
 168                 if (lat[1] == 90 || lat[1] == -90) xy[1][0] = 0.5;
 169                 if (lat[2] == 90 || lat[2] == -90) xy[2][0] = 0.5;
 170
 171                 glEnable(GL_TEXTURE_2D);
 172                 glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
 173                 glBegin(GL_TRIANGLES);
 174                 glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
 175                 glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
 176                 glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
 177                 glEnd();
 178         }
 179         g_list_free(triangles);
 180 }
 181
 182 static void _draw_tiles(GisOpenGL *opengl, GisTile *tile)
 183 {
 184         /* Only draw children if possible */
 185         gboolean has_children = TRUE;
 186         GisTile *child;
 187         gis_tile_foreach(tile, child)
 188                 if (!child || !child->data)
 189                         has_children = FALSE;
 190         if (has_children)
 191                 /* Only draw children */
 192                 gis_tile_foreach(tile, child)
 193                         _draw_tiles(opengl, child);
 194         else
 195                 /* No children, draw this tile */
 196                 _draw_tile(opengl, tile);
 197 }
 198
 199 static void _draw_marker(GisOpenGL *opengl, GisMarker *marker)
 200 {
 201         GisPoint *point = gis_object_center(GIS_OBJECT(marker));
 202         gdouble px, py, pz;
 203         gis_viewer_project(GIS_VIEWER(opengl),
 204                         point->lat, point->lon, point->elev,
 205                         &px, &py, &pz);
 206         if (pz > 1)
 207                 return;
 208
 209         //g_debug("GisOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
 210
 211         cairo_surface_t *surface = cairo_get_target(marker->cairo);
 212         gdouble width  = cairo_image_surface_get_width(surface);
 213         gdouble height = cairo_image_surface_get_height(surface);
 214
 215         glMatrixMode(GL_PROJECTION); glLoadIdentity();
 216         glMatrixMode(GL_MODELVIEW);  glLoadIdentity();
 217         glOrtho(0, GTK_WIDGET(opengl)->allocation.width,
 218                 0, GTK_WIDGET(opengl)->allocation.height, -1, 1);
 219         glTranslated(px - marker->xoff,
 220                      py - marker->yoff, 0);
 221
 222         glDisable(GL_LIGHTING);
 223         glDisable(GL_COLOR_MATERIAL);
 224         glDisable(GL_DEPTH_TEST);
 225         glEnable(GL_TEXTURE_2D);
 226         glBindTexture(GL_TEXTURE_2D, marker->tex);
 227         glBegin(GL_QUADS);
 228         glTexCoord2f(1, 1); glVertex3f(width, 0     , 0);
 229         glTexCoord2f(1, 0); glVertex3f(width, height, 0);
 230         glTexCoord2f(0, 0); glVertex3f(0    , height, 0);
 231         glTexCoord2f(0, 1); glVertex3f(0    , 0     , 0);
 232         glEnd();
 233 }
 234
 235 static void _draw_callback(GisOpenGL *opengl, GisCallback *callback)
 236 {
 237         callback->callback(callback, callback->user_data);
 238 }
 239
 240 static void _draw_object(GisOpenGL *opengl, GisObject *object)
 241 {
 242         //g_debug("GisOpenGL: draw_object");
 243         /* Skip out of range objects */
 244         if (object->lod > 0) {
 245                 gdouble eye[3], obj[3];
 246                 gis_viewer_get_location(GIS_VIEWER(opengl), &eye[0], &eye[1], &eye[2]);
 247                 lle2xyz(eye[0], eye[1], eye[2], &eye[0], &eye[1], &eye[2]);
 248                 lle2xyz(object->center.lat, object->center.lon, object->center.elev,
 249                         &obj[0], &obj[1], &obj[2]);
 250                 gdouble dist = distd(obj, eye);
 251                 if (object->lod < dist)
 252                         return;
 253         }
 254
 255         /* Draw */
 256         glMatrixMode(GL_PROJECTION); glPushMatrix();
 257         glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 258         glPushAttrib(GL_ALL_ATTRIB_BITS);
 259         if (GIS_IS_MARKER(object)) {
 260                 _draw_marker(opengl, GIS_MARKER(object));
 261         } else if (GIS_IS_CALLBACK(object)) {
 262                 _draw_callback(opengl, GIS_CALLBACK(object));
 263         } else if (GIS_IS_TILE(object)) {
 264                 _draw_tiles(opengl, GIS_TILE(object));
 265         }
 266         glPopAttrib();
 267         glMatrixMode(GL_PROJECTION); glPopMatrix();
 268         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 269 }
 270
 271 static void _load_object(GisOpenGL *opengl, GisObject *object)
 272 {
 273         g_debug("GisOpenGL: load_object");
 274         if (GIS_IS_MARKER(object)) {
 275                 GisMarker *marker = GIS_MARKER(object);
 276                 cairo_surface_t *surface = cairo_get_target(marker->cairo);
 277                 gdouble width  = cairo_image_surface_get_width(surface);
 278                 gdouble height = cairo_image_surface_get_height(surface);
 279
 280                 glEnable(GL_TEXTURE_2D);
 281                 glGenTextures(1, &marker->tex);
 282                 glBindTexture(GL_TEXTURE_2D, marker->tex);
 283
 284                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 285                 glPixelStorei(GL_PACK_ALIGNMENT, 1);
 286                 glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
 287                                 cairo_image_surface_get_data(surface));
 288                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 289                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 290                 g_debug("load_texture: %d", marker->tex);
 291         }
 292 }
 293
 294 static void _unload_object(GisOpenGL *opengl, GisObject *object)
 295 {
 296         g_debug("GisOpenGL: unload_object");
 297         if (GIS_IS_MARKER(object)) {
 298                 GisMarker *marker = GIS_MARKER(object);
 299                 glDeleteTextures(1, &marker->tex);
 300         }
 301 }
 302
 303
 304 /*************
 305  * Callbacks *
 306  *************/
 307 /* The unsorted/sroted GLists are blank head nodes,
 308  * This way us we can remove objects from the level just by fixing up links
 309  * I.e. we don't need to do a lookup to remove an object if we have its GList */
 310 struct RenderLevel {
 311         GList unsorted;
 312         GList sorted;
 313 };
 314
 315 static void on_realize(GisOpenGL *opengl, gpointer _)
 316 {
 317         g_debug("GisOpenGL: on_realize");
 318
 319         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(opengl));
 320         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 321         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 322                 g_assert_not_reached();
 323
 324         _set_visuals(opengl);
 325         g_mutex_lock(opengl->sphere_lock);
 326         roam_sphere_update_errors(opengl->sphere);
 327         g_mutex_unlock(opengl->sphere_lock);
 328 }
 329
 330 static gboolean on_configure(GisOpenGL *opengl, GdkEventConfigure *event, gpointer _)
 331 {
 332         g_debug("GisOpenGL: on_configure");
 333
 334         double width  = GTK_WIDGET(opengl)->allocation.width;
 335         double height = GTK_WIDGET(opengl)->allocation.height;
 336
 337         /* Setup OpenGL Window */
 338         glViewport(0, 0, width, height);
 339         glMatrixMode(GL_PROJECTION);
 340         glLoadIdentity();
 341         double ang = atan(height/FOV_DIST);
 342         gluPerspective(rad2deg(ang)*2, width/height, 1, 10*EARTH_R);
 343
 344 #ifndef ROAM_DEBUG
 345         g_mutex_lock(opengl->sphere_lock);
 346         roam_sphere_update_errors(opengl->sphere);
 347         g_mutex_unlock(opengl->sphere_lock);
 348 #endif
 349
 350         return FALSE;
 351 }
 352
 353 static gboolean _draw_level(gpointer key, gpointer value, gpointer user_data)
 354 {
 355         g_debug("GisOpenGL: _draw_level - level=%-4d", (int)key);
 356         GisOpenGL *opengl = user_data;
 357         struct RenderLevel *level = value;
 358         int nsorted = 0, nunsorted = 0;
 359         GList *cur = NULL;
 360
 361         /* Draw opaque objects without sorting */
 362         glDepthMask(TRUE);
 363         glClear(GL_DEPTH_BUFFER_BIT);
 364         for (cur = level->unsorted.next; cur; cur = cur->next, nunsorted++)
 365                 _draw_object(opengl, GIS_OBJECT(cur->data));
 366
 367         /* Freeze depth buffer and draw transparent objects sorted */
 368         /* TODO: sorting */
 369         //glDepthMask(FALSE);
 370         glAlphaFunc(GL_GREATER, 0.1);
 371         for (cur = level->sorted.next; cur; cur = cur->next, nsorted++)
 372                 _draw_object(opengl, GIS_OBJECT(cur->data));
 373
 374         /* TODO: Prune empty levels */
 375
 376         g_debug("GisOpenGL: _draw_level - drew %d,%d objects",
 377                         nunsorted, nsorted);
 378         return FALSE;
 379 }
 380
 381 static gboolean on_expose(GisOpenGL *opengl, GdkEventExpose *event, gpointer _)
 382 {
 383         g_debug("GisOpenGL: on_expose - begin");
 384
 385         glClear(GL_COLOR_BUFFER_BIT);
 386
 387         _set_visuals(opengl);
 388 #ifdef ROAM_DEBUG
 389         glColor4f(0.0, 0.0, 9.0, 0.6);
 390         glDisable(GL_TEXTURE_2D);
 391         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 392         roam_sphere_draw(opengl->sphere);
 393         //roam_sphere_draw_normals(opengl->sphere);
 394 #else
 395         g_tree_foreach(opengl->objects, _draw_level, opengl);
 396         if (opengl->wireframe) {
 397                 glClear(GL_DEPTH_BUFFER_BIT);
 398                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 399                 roam_sphere_draw(opengl->sphere);
 400         }
 401 #endif
 402
 403         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 404         gdk_gl_drawable_swap_buffers(gldrawable);
 405
 406         g_debug("GisOpenGL: on_expose - end\n");
 407         return FALSE;
 408 }
 409
 410 static gboolean on_key_press(GisOpenGL *opengl, GdkEventKey *event, gpointer _)
 411 {
 412         g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 413                         event->keyval, event->state, GDK_plus);
 414
 415         guint kv = event->keyval;
 416         gdk_threads_leave();
 417         /* Testing */
 418         if (kv == GDK_w) {
 419                 opengl->wireframe = !opengl->wireframe;
 420                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 421         }
 422 #ifdef ROAM_DEBUG
 423         else if (kv == GDK_n) roam_sphere_split_one(opengl->sphere);
 424         else if (kv == GDK_p) roam_sphere_merge_one(opengl->sphere);
 425         else if (kv == GDK_r) roam_sphere_split_merge(opengl->sphere);
 426         else if (kv == GDK_u) roam_sphere_update_errors(opengl->sphere);
 427         gdk_threads_enter();
 428         gtk_widget_queue_draw(GTK_WIDGET(opengl));
 429 #else
 430         gdk_threads_enter();
 431 #endif
 432         return FALSE;
 433 }
 434
 435 static gboolean _update_errors_cb(gpointer sphere)
 436 {
 437         roam_sphere_update_errors(sphere);
 438         return FALSE;
 439 }
 440 static void on_view_changed(GisOpenGL *opengl,
 441                 gdouble _1, gdouble _2, gdouble _3)
 442 {
 443         g_debug("GisOpenGL: on_view_changed");
 444         _set_visuals(opengl);
 445 #ifndef ROAM_DEBUG
 446         opengl->ue_source = g_idle_add_full(G_PRIORITY_HIGH_IDLE+30,
 447                         _update_errors_cb, opengl->sphere, NULL);
 448         //roam_sphere_update_errors(opengl->sphere);
 449 #endif
 450 }
 451
 452 static gboolean on_idle(GisOpenGL *opengl)
 453 {
 454         //g_debug("GisOpenGL: on_idle");
 455         gdk_threads_enter();
 456         g_mutex_lock(opengl->sphere_lock);
 457         if (roam_sphere_split_merge(opengl->sphere))
 458                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 459         g_mutex_unlock(opengl->sphere_lock);
 460         gdk_threads_leave();
 461         return TRUE;
 462 }
 463
 464
 465 /*********************
 466  * GisViewer methods *
 467  *********************/
 468 GisViewer *gis_opengl_new(GisPlugins *plugins, GisPrefs *prefs)
 469 {
 470         g_debug("GisOpenGL: new");
 471         GisViewer *opengl = g_object_new(GIS_TYPE_OPENGL, NULL);
 472         gis_viewer_setup(opengl, plugins, prefs);
 473         return opengl;
 474 }
 475
 476 static void gis_opengl_center_position(GisViewer *_opengl, gdouble lat, gdouble lon, gdouble elev)
 477 {
 478         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 479         glRotatef(lon, 0, 1, 0);
 480         glRotatef(-lat, 1, 0, 0);
 481         glTranslatef(0, 0, elev2rad(elev));
 482 }
 483
 484 static void gis_opengl_project(GisViewer *_opengl,
 485                 gdouble lat, gdouble lon, gdouble elev,
 486                 gdouble *px, gdouble *py, gdouble *pz)
 487 {
 488         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 489         gdouble x, y, z;
 490         lle2xyz(lat, lon, elev, &x, &y, &z);
 491         gluProject(x, y, z,
 492                 opengl->sphere->view->model,
 493                 opengl->sphere->view->proj,
 494                 opengl->sphere->view->view,
 495                 px, py, pz);
 496 }
 497
 498 static void gis_opengl_set_height_func(GisViewer *_opengl, GisTile *tile,
 499                 RoamHeightFunc height_func, gpointer user_data, gboolean update)
 500 {
 501         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 502         if (!tile)
 503                 return;
 504         /* TODO: get points? */
 505         g_mutex_lock(opengl->sphere_lock);
 506         GList *triangles = roam_sphere_get_intersect(opengl->sphere, TRUE,
 507                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 508         for (GList *cur = triangles; cur; cur = cur->next) {
 509                 RoamTriangle *tri = cur->data;
 510                 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
 511                 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 512                         if (tile->edge.n >= points[i]->lat && points[i]->lat >= tile->edge.s &&
 513                             tile->edge.e >= points[i]->lon && points[i]->lon >= tile->edge.w) {
 514                                 points[i]->height_func = height_func;
 515                                 points[i]->height_data = user_data;
 516                                 roam_point_update_height(points[i]);
 517                         }
 518                 }
 519         }
 520         g_list_free(triangles);
 521         g_mutex_unlock(opengl->sphere_lock);
 522 }
 523
 524 static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
 525 {
 526         if (!root)
 527                 return;
 528         RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
 529         for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 530                 points[i]->height_func = NULL;
 531                 points[i]->height_data = NULL;
 532                 roam_point_update_height(points[i]);
 533         }
 534         _gis_opengl_clear_height_func_rec(root->kids[0]);
 535         _gis_opengl_clear_height_func_rec(root->kids[1]);
 536 }
 537
 538 static void gis_opengl_clear_height_func(GisViewer *_opengl)
 539 {
 540         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 541         for (int i = 0; i < G_N_ELEMENTS(opengl->sphere->roots); i++)
 542                 _gis_opengl_clear_height_func_rec(opengl->sphere->roots[i]);
 543 }
 544
 545 static gpointer gis_opengl_add(GisViewer *_opengl, GisObject *object,
 546                 gint key, gboolean sort)
 547 {
 548         g_assert(GIS_IS_OPENGL(_opengl));
 549         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 550         _load_object(opengl, object);
 551         struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)key);
 552         if (!level) {
 553                 level = g_new0(struct RenderLevel, 1);
 554                 g_tree_insert(opengl->objects, (gpointer)key, level);
 555         }
 556         GList *list = sort ? &level->sorted : &level->unsorted;
 557         /* Put the link in the list */
 558         GList *next = g_new0(GList, 1);
 559         next->data = object;
 560         next->prev = list;
 561         next->next = list->next;
 562         list->next = next;
 563         return next;
 564 }
 565
 566 static GisObject *gis_opengl_remove(GisViewer *_opengl, gpointer _link)
 567 {
 568         g_assert(GIS_IS_OPENGL(_opengl));
 569         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 570         GList *link = _link;
 571         GisObject *object = link->data;
 572         _unload_object(opengl, object);
 573         /* Just unlink and free it, link->prev is assured */
 574         link->prev->next = link->next;
 575         if (link->next)
 576                 link->next->prev = link->prev;
 577         g_free(link);
 578         g_object_unref(object);
 579         return object;
 580 }
 581
 582 /****************
 583  * GObject code *
 584  ****************/
 585 static int _objects_cmp(gconstpointer _a, gconstpointer _b, gpointer _)
 586 {
 587         gint a = (int)_a, b = (int)_b;
 588         return a < b ? -1 :
 589                a > b ?  1 : 0;
 590 }
 591 static void _objects_free(gpointer value)
 592 {
 593         struct RenderLevel *level = value;
 594         if (level->sorted.next)
 595                 g_list_free(level->sorted.next);
 596         if (level->unsorted.next)
 597                 g_list_free(level->unsorted.next);
 598         g_free(level);
 599 }
 600
 601 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GIS_TYPE_VIEWER);
 602 static void gis_opengl_init(GisOpenGL *opengl)
 603 {
 604         g_debug("GisOpenGL: init");
 605         /* OpenGL setup */
 606         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 607                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 608                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 609         if (!glconfig)
 610                 g_error("Failed to create glconfig");
 611         if (!gtk_widget_set_gl_capability(GTK_WIDGET(opengl),
 612                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 613                 g_error("GL lacks required capabilities");
 614         g_object_unref(glconfig);
 615
 616         opengl->objects = g_tree_new_full(_objects_cmp, NULL, NULL, _objects_free);
 617         opengl->sphere = roam_sphere_new(opengl);
 618         opengl->sphere_lock = g_mutex_new();
 619
 620 #ifndef ROAM_DEBUG
 621         opengl->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33,  (GSourceFunc)on_idle, opengl, NULL);
 622         opengl->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, opengl, NULL);
 623 #endif
 624
 625         gtk_widget_add_events(GTK_WIDGET(opengl), GDK_KEY_PRESS_MASK);
 626         g_signal_connect(opengl, "realize",          G_CALLBACK(on_realize),      NULL);
 627         g_signal_connect(opengl, "configure-event",  G_CALLBACK(on_configure),    NULL);
 628         g_signal_connect(opengl, "expose-event",     G_CALLBACK(on_expose),       NULL);
 629
 630         g_signal_connect(opengl, "key-press-event",  G_CALLBACK(on_key_press),    NULL);
 631
 632         g_signal_connect(opengl, "location-changed", G_CALLBACK(on_view_changed), NULL);
 633         g_signal_connect(opengl, "rotation-changed", G_CALLBACK(on_view_changed), NULL);
 634 }
 635 static void gis_opengl_dispose(GObject *_opengl)
 636 {
 637         g_debug("GisOpenGL: dispose");
 638         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 639         if (opengl->sm_source[0]) {
 640                 g_source_remove(opengl->sm_source[0]);
 641                 opengl->sm_source[0] = 0;
 642         }
 643         if (opengl->sm_source[1]) {
 644                 g_source_remove(opengl->sm_source[1]);
 645                 opengl->sm_source[1] = 0;
 646         }
 647         if (opengl->ue_source) {
 648                 g_source_remove(opengl->ue_source);
 649                 opengl->ue_source = 0;
 650         }
 651         G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_opengl);
 652 }
 653 static void gis_opengl_finalize(GObject *_opengl)
 654 {
 655         g_debug("GisOpenGL: finalize");
 656         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 657         roam_sphere_free(opengl->sphere);
 658         g_tree_destroy(opengl->objects);
 659         g_mutex_free(opengl->sphere_lock);
 660         G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_opengl);
 661 }
 662 static void gis_opengl_class_init(GisOpenGLClass *klass)
 663 {
 664         g_debug("GisOpenGL: class_init");
 665         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 666         gobject_class->finalize = gis_opengl_finalize;
 667         gobject_class->dispose = gis_opengl_dispose;
 668
 669         GisViewerClass *viewer_class = GIS_VIEWER_CLASS(klass);
 670         viewer_class->center_position   = gis_opengl_center_position;
 671         viewer_class->project           = gis_opengl_project;
 672         viewer_class->clear_height_func = gis_opengl_clear_height_func;
 673         viewer_class->set_height_func   = gis_opengl_set_height_func;
 674         viewer_class->add               = gis_opengl_add;
 675         viewer_class->remove            = gis_opengl_remove;
 676 }