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 /**
  19  * SECTION:gis-opengl
  20  * @short_description: OpenGL based virtual globe
  21  *
  22  * #GisOpenGL is the core rendering engine used by libgis. Theoretically other
  23  * renderers could be writte, but they have not been. GisOpenGL uses the ROAM
  24  * algorithm for updating surface mesh the planet. The only thing GisOpenGL can
  25  * actually render on it's own is a wireframe of a sphere.
  26  *
  27  * GisOpenGL relies on #GtkGlExt and requires (at least) OpenGL 2.0.
  28  */
  29
  30 #include <config.h>
  31 #include <math.h>
  32 #include <string.h>
  33 #include <gdk/gdkkeysyms.h>
  34 #include <gtk/gtk.h>
  35 #include <gtk/gtkgl.h>
  36 #include <GL/gl.h>
  37 #include <GL/glu.h>
  38
  39 #include "gis-opengl.h"
  40 #include "gis-util.h"
  41 #include "roam.h"
  42
  43 #include "objects/gis-object.h"
  44 #include "objects/gis-marker.h"
  45 #include "objects/gis-callback.h"
  46
  47 // #define ROAM_DEBUG
  48
  49 /* Tessellation, "finding intersecting triangles" */
  50 /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
  51 /* http://www.opengl.org/wiki/Alpha_Blending */
  52
  53 /***********
  54  * Helpers *
  55  ***********/
  56 static void _set_visuals(GisOpenGL *opengl)
  57 {
  58         glMatrixMode(GL_MODELVIEW);
  59         glLoadIdentity();
  60
  61         /* Camera 1 */
  62         double lat, lon, elev, rx, ry, rz;
  63         gis_viewer_get_location(GIS_VIEWER(opengl), &lat, &lon, &elev);
  64         gis_viewer_get_rotation(GIS_VIEWER(opengl), &rx, &ry, &rz);
  65         glRotatef(rx, 1, 0, 0);
  66         glRotatef(rz, 0, 0, 1);
  67
  68         /* Lighting */
  69 #ifdef ROAM_DEBUG
  70         float light_ambient[]  = {0.7f, 0.7f, 0.7f, 1.0f};
  71         float light_diffuse[]  = {2.0f, 2.0f, 2.0f, 1.0f};
  72 #else
  73         float light_ambient[]  = {0.2f, 0.2f, 0.2f, 1.0f};
  74         float light_diffuse[]  = {5.0f, 5.0f, 5.0f, 1.0f};
  75 #endif
  76         float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
  77         glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
  78         glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
  79         glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  80         glEnable(GL_LIGHT0);
  81         glEnable(GL_LIGHTING);
  82
  83         float material_ambient[]  = {0.2, 0.2, 0.2, 1.0};
  84         float material_diffuse[]  = {0.8, 0.8, 0.8, 1.0};
  85         float material_specular[] = {0.1, 0.1, 0.1, 1.0};
  86         float material_emission[] = {0.0, 0.0, 0.0, 1.0};
  87         glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT,  material_ambient);
  88         glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE,  material_diffuse);
  89         glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
  90         glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
  91         glDisable(GL_TEXTURE_2D);
  92         glDisable(GL_COLOR_MATERIAL);
  93
  94         /* Camera 2 */
  95         glTranslatef(0, 0, -elev2rad(elev));
  96         glRotatef(lat, 1, 0, 0);
  97         glRotatef(-lon, 0, 1, 0);
  98
  99         glDisable(GL_ALPHA_TEST);
 100
 101         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 102         glEnable(GL_BLEND);
 103
 104 #ifndef ROAM_DEBUG
 105         glCullFace(GL_BACK);
 106         glEnable(GL_CULL_FACE);
 107 #endif
 108
 109         glClearDepth(1.0);
 110         glDepthFunc(GL_LEQUAL);
 111         glEnable(GL_DEPTH_TEST);
 112
 113         glEnable(GL_LINE_SMOOTH);
 114
 115         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 116         //glShadeModel(GL_FLAT);
 117
 118         roam_sphere_update_view(opengl->sphere);
 119 }
 120
 121
 122 /********************
 123  * Object handleing *
 124  ********************/
 125 static void _draw_tile(GisOpenGL *opengl, GisTile *tile, GList *triangles)
 126 {
 127         if (!tile || !tile->data)
 128                 return;
 129         if (!triangles)
 130                 g_warning("GisOpenGL: _draw_tiles - No triangles to draw: edges=%f,%f,%f,%f",
 131                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 132         //g_message("drawing %4d triangles for tile edges=%7.2f,%7.2f,%7.2f,%7.2f",
 133         //              g_list_length(triangles), tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 134         for (GList *cur = triangles; cur; cur = cur->next) {
 135                 RoamTriangle *tri = cur->data;
 136
 137                 gdouble lat[3] = {tri->p.r->lat, tri->p.m->lat, tri->p.l->lat};
 138                 gdouble lon[3] = {tri->p.r->lon, tri->p.m->lon, tri->p.l->lon};
 139
 140                 if (lon[0] < -90 || lon[1] < -90 || lon[2] < -90) {
 141                         if (lon[0] > 90) lon[0] -= 360;
 142                         if (lon[1] > 90) lon[1] -= 360;
 143                         if (lon[2] > 90) lon[2] -= 360;
 144                 }
 145
 146                 gdouble n = tile->edge.n;
 147                 gdouble s = tile->edge.s;
 148                 gdouble e = tile->edge.e;
 149                 gdouble w = tile->edge.w;
 150
 151                 gdouble londist = e - w;
 152                 gdouble latdist = n - s;
 153
 154                 gdouble xy[3][2] = {
 155                         {(lon[0]-w)/londist, 1-(lat[0]-s)/latdist},
 156                         {(lon[1]-w)/londist, 1-(lat[1]-s)/latdist},
 157                         {(lon[2]-w)/londist, 1-(lat[2]-s)/latdist},
 158                 };
 159
 160                 //if ((lat[0] == 90 && (xy[0][0] < 0 || xy[0][0] > 1)) ||
 161                 //    (lat[1] == 90 && (xy[1][0] < 0 || xy[1][0] > 1)) ||
 162                 //    (lat[2] == 90 && (xy[2][0] < 0 || xy[2][0] > 1)))
 163                 //      g_message("w,e=%4.f,%4.f   "
 164                 //                "lat,lon,x,y="
 165                 //                "%4.1f,%4.0f,%4.2f,%4.2f   "
 166                 //                "%4.1f,%4.0f,%4.2f,%4.2f   "
 167                 //                "%4.1f,%4.0f,%4.2f,%4.2f   ",
 168                 //              w,e,
 169                 //              lat[0], lon[0], xy[0][0], xy[0][1],
 170                 //              lat[1], lon[1], xy[1][0], xy[1][1],
 171                 //              lat[2], lon[2], xy[2][0], xy[2][1]);
 172
 173                 /* Fix poles */
 174                 if (lat[0] == 90 || lat[0] == -90) xy[0][0] = 0.5;
 175                 if (lat[1] == 90 || lat[1] == -90) xy[1][0] = 0.5;
 176                 if (lat[2] == 90 || lat[2] == -90) xy[2][0] = 0.5;
 177
 178                 glEnable(GL_TEXTURE_2D);
 179                 glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
 180                 glBegin(GL_TRIANGLES);
 181                 glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
 182                 glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
 183                 glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
 184                 glEnd();
 185         }
 186         g_list_free(triangles);
 187 }
 188
 189 static void _draw_tiles(GisOpenGL *opengl, GisTile *tile)
 190 {
 191         /* Only draw children if possible */
 192         gboolean has_children = FALSE;
 193         GisTile *child;
 194         gis_tile_foreach(tile, child)
 195                 if (child && child->data)
 196                         has_children = TRUE;
 197
 198         GList *triangles = NULL;
 199         if (has_children) {
 200                 /* TODO: simplify this */
 201                 const gdouble rows = G_N_ELEMENTS(tile->children);
 202                 const gdouble cols = G_N_ELEMENTS(tile->children[0]);
 203                 const gdouble lat_dist = tile->edge.n - tile->edge.s;
 204                 const gdouble lon_dist = tile->edge.e - tile->edge.w;
 205                 const gdouble lat_step = lat_dist / rows;
 206                 const gdouble lon_step = lon_dist / cols;
 207                 int row, col;
 208                 gis_tile_foreach_index(tile, row, col) {
 209                         GisTile *child = tile->children[row][col];
 210                         if (child && child->data) {
 211                                 _draw_tiles(opengl, child);
 212                         } else {
 213                                 const gdouble n = tile->edge.n-(lat_step*(row+0));
 214                                 const gdouble s = tile->edge.n-(lat_step*(row+1));
 215                                 const gdouble e = tile->edge.w+(lon_step*(col+1));
 216                                 const gdouble w = tile->edge.w+(lon_step*(col+0));
 217                                 GList *these = roam_sphere_get_intersect(opengl->sphere, FALSE, n, s, e, w);
 218                                 triangles = g_list_concat(triangles, these);
 219                         }
 220                 }
 221         } else {
 222                 triangles = roam_sphere_get_intersect(opengl->sphere, FALSE,
 223                                 tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 224         }
 225         if (triangles)
 226                 _draw_tile(opengl, tile, triangles);
 227 }
 228
 229 static void _draw_marker(GisOpenGL *opengl, GisMarker *marker)
 230 {
 231         GisPoint *point = gis_object_center(marker);
 232         gdouble px, py, pz;
 233         gis_viewer_project(GIS_VIEWER(opengl),
 234                         point->lat, point->lon, point->elev,
 235                         &px, &py, &pz);
 236         if (pz > 1)
 237                 return;
 238
 239         //g_debug("GisOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
 240
 241         cairo_surface_t *surface = cairo_get_target(marker->cairo);
 242         gdouble width  = cairo_image_surface_get_width(surface);
 243         gdouble height = cairo_image_surface_get_height(surface);
 244
 245         glMatrixMode(GL_PROJECTION); glLoadIdentity();
 246         glMatrixMode(GL_MODELVIEW);  glLoadIdentity();
 247         glOrtho(0, GTK_WIDGET(opengl)->allocation.width,
 248                 0, GTK_WIDGET(opengl)->allocation.height, -1, 1);
 249         glTranslated(px - marker->xoff,
 250                      py - marker->yoff, 0);
 251
 252         glDisable(GL_LIGHTING);
 253         glDisable(GL_COLOR_MATERIAL);
 254         glDisable(GL_DEPTH_TEST);
 255         glEnable(GL_TEXTURE_2D);
 256         glBindTexture(GL_TEXTURE_2D, marker->tex);
 257         glBegin(GL_QUADS);
 258         glTexCoord2f(1, 1); glVertex3f(width, 0     , 0);
 259         glTexCoord2f(1, 0); glVertex3f(width, height, 0);
 260         glTexCoord2f(0, 0); glVertex3f(0    , height, 0);
 261         glTexCoord2f(0, 1); glVertex3f(0    , 0     , 0);
 262         glEnd();
 263 }
 264
 265 static void _draw_callback(GisOpenGL *opengl, GisCallback *callback)
 266 {
 267         callback->callback(callback, callback->user_data);
 268 }
 269
 270 static void _draw_object(GisOpenGL *opengl, GisObject *object)
 271 {
 272         //g_debug("GisOpenGL: draw_object");
 273         /* Skip out of range objects */
 274         if (object->lod > 0) {
 275                 gdouble eye[3], obj[3];
 276                 gis_viewer_get_location(GIS_VIEWER(opengl), &eye[0], &eye[1], &eye[2]);
 277                 lle2xyz(eye[0], eye[1], eye[2], &eye[0], &eye[1], &eye[2]);
 278                 lle2xyz(object->center.lat, object->center.lon, object->center.elev,
 279                         &obj[0], &obj[1], &obj[2]);
 280                 gdouble dist = distd(obj, eye);
 281                 if (object->lod < dist)
 282                         return;
 283         }
 284
 285         /* Draw */
 286         glMatrixMode(GL_PROJECTION); glPushMatrix();
 287         glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 288         glPushAttrib(GL_ALL_ATTRIB_BITS);
 289         if (GIS_IS_MARKER(object)) {
 290                 _draw_marker(opengl, GIS_MARKER(object));
 291         } else if (GIS_IS_CALLBACK(object)) {
 292                 _draw_callback(opengl, GIS_CALLBACK(object));
 293         } else if (GIS_IS_TILE(object)) {
 294                 glEnable(GL_DEPTH_TEST);
 295                 glDepthFunc(GL_LESS);
 296                 _draw_tiles(opengl, GIS_TILE(object));
 297         }
 298         glPopAttrib();
 299         glMatrixMode(GL_PROJECTION); glPopMatrix();
 300         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 301 }
 302
 303 static void _load_object(GisOpenGL *opengl, GisObject *object)
 304 {
 305         g_debug("GisOpenGL: load_object");
 306         if (GIS_IS_MARKER(object)) {
 307                 GisMarker *marker = GIS_MARKER(object);
 308                 cairo_surface_t *surface = cairo_get_target(marker->cairo);
 309                 gdouble width  = cairo_image_surface_get_width(surface);
 310                 gdouble height = cairo_image_surface_get_height(surface);
 311
 312                 glEnable(GL_TEXTURE_2D);
 313                 glGenTextures(1, &marker->tex);
 314                 glBindTexture(GL_TEXTURE_2D, marker->tex);
 315
 316                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 317                 glPixelStorei(GL_PACK_ALIGNMENT, 1);
 318                 glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
 319                                 cairo_image_surface_get_data(surface));
 320                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 321                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 322                 g_debug("load_texture: %d", marker->tex);
 323         }
 324 }
 325
 326 static void _unload_object(GisOpenGL *opengl, GisObject *object)
 327 {
 328         g_debug("GisOpenGL: unload_object");
 329         if (GIS_IS_MARKER(object)) {
 330                 GisMarker *marker = GIS_MARKER(object);
 331                 glDeleteTextures(1, &marker->tex);
 332         }
 333 }
 334
 335
 336 /*************
 337  * Callbacks *
 338  *************/
 339 /* The unsorted/sroted GLists are blank head nodes,
 340  * This way us we can remove objects from the level just by fixing up links
 341  * I.e. we don't need to do a lookup to remove an object if we have its GList */
 342 struct RenderLevel {
 343         GList unsorted;
 344         GList sorted;
 345 };
 346
 347 static gboolean on_configure(GisOpenGL *opengl, GdkEventConfigure *event, gpointer _)
 348 {
 349         g_debug("GisOpenGL: on_configure");
 350
 351         double width  = GTK_WIDGET(opengl)->allocation.width;
 352         double height = GTK_WIDGET(opengl)->allocation.height;
 353
 354         /* Setup OpenGL Window */
 355         glViewport(0, 0, width, height);
 356         glMatrixMode(GL_PROJECTION);
 357         glLoadIdentity();
 358         double ang = atan(height/FOV_DIST);
 359         gluPerspective(rad2deg(ang)*2, width/height, 1, 10*EARTH_R);
 360
 361 #ifndef ROAM_DEBUG
 362         g_mutex_lock(opengl->sphere_lock);
 363         roam_sphere_update_errors(opengl->sphere);
 364         g_mutex_unlock(opengl->sphere_lock);
 365 #endif
 366
 367         return FALSE;
 368 }
 369
 370 static void on_realize(GisOpenGL *opengl, gpointer _)
 371 {
 372         g_debug("GisOpenGL: on_realize");
 373
 374         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(opengl));
 375         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 376         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 377                 g_assert_not_reached();
 378
 379         _set_visuals(opengl);
 380         on_configure(opengl, NULL, NULL);
 381 }
 382
 383 static gboolean _draw_level(gpointer key, gpointer value, gpointer user_data)
 384 {
 385         g_debug("GisOpenGL: _draw_level - level=%-4d", (int)key);
 386         GisOpenGL *opengl = user_data;
 387         struct RenderLevel *level = value;
 388         int nsorted = 0, nunsorted = 0;
 389         GList *cur = NULL;
 390
 391         /* Draw opaque objects without sorting */
 392         glDepthMask(TRUE);
 393         glClear(GL_DEPTH_BUFFER_BIT);
 394         for (cur = level->unsorted.next; cur; cur = cur->next, nunsorted++)
 395                 _draw_object(opengl, GIS_OBJECT(cur->data));
 396
 397         /* Freeze depth buffer and draw transparent objects sorted */
 398         /* TODO: sorting */
 399         //glDepthMask(FALSE);
 400         glAlphaFunc(GL_GREATER, 0.1);
 401         for (cur = level->sorted.next; cur; cur = cur->next, nsorted++)
 402                 _draw_object(opengl, GIS_OBJECT(cur->data));
 403
 404         /* TODO: Prune empty levels */
 405
 406         g_debug("GisOpenGL: _draw_level - drew %d,%d objects",
 407                         nunsorted, nsorted);
 408         return FALSE;
 409 }
 410
 411 static gboolean on_expose(GisOpenGL *opengl, GdkEventExpose *event, gpointer _)
 412 {
 413         g_debug("GisOpenGL: on_expose - begin");
 414
 415         glClear(GL_COLOR_BUFFER_BIT);
 416
 417         _set_visuals(opengl);
 418 #ifdef ROAM_DEBUG
 419         glColor4f(0.0, 0.0, 9.0, 0.6);
 420         glDisable(GL_TEXTURE_2D);
 421         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 422         roam_sphere_draw(opengl->sphere);
 423         //roam_sphere_draw_normals(opengl->sphere);
 424 #else
 425         g_tree_foreach(opengl->objects, _draw_level, opengl);
 426         if (opengl->wireframe) {
 427                 glClear(GL_DEPTH_BUFFER_BIT);
 428                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 429                 roam_sphere_draw(opengl->sphere);
 430         }
 431 #endif
 432
 433         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 434         gdk_gl_drawable_swap_buffers(gldrawable);
 435
 436         g_debug("GisOpenGL: on_expose - end\n");
 437         return FALSE;
 438 }
 439
 440 static gboolean on_key_press(GisOpenGL *opengl, GdkEventKey *event, gpointer _)
 441 {
 442         g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 443                         event->keyval, event->state, GDK_plus);
 444
 445         guint kv = event->keyval;
 446         gdk_threads_leave();
 447         /* Testing */
 448         if (kv == GDK_w) {
 449                 opengl->wireframe = !opengl->wireframe;
 450                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 451         }
 452 #ifdef ROAM_DEBUG
 453         else if (kv == GDK_n) roam_sphere_split_one(opengl->sphere);
 454         else if (kv == GDK_p) roam_sphere_merge_one(opengl->sphere);
 455         else if (kv == GDK_r) roam_sphere_split_merge(opengl->sphere);
 456         else if (kv == GDK_u) roam_sphere_update_errors(opengl->sphere);
 457         gdk_threads_enter();
 458         gtk_widget_queue_draw(GTK_WIDGET(opengl));
 459 #else
 460         gdk_threads_enter();
 461 #endif
 462         return FALSE;
 463 }
 464
 465 static gboolean _update_errors_cb(gpointer sphere)
 466 {
 467         roam_sphere_update_errors(sphere);
 468         return FALSE;
 469 }
 470 static void on_view_changed(GisOpenGL *opengl,
 471                 gdouble _1, gdouble _2, gdouble _3)
 472 {
 473         g_debug("GisOpenGL: on_view_changed");
 474         _set_visuals(opengl);
 475 #ifndef ROAM_DEBUG
 476         opengl->ue_source = g_idle_add_full(G_PRIORITY_HIGH_IDLE+30,
 477                         _update_errors_cb, opengl->sphere, NULL);
 478         //roam_sphere_update_errors(opengl->sphere);
 479 #endif
 480 }
 481
 482 static gboolean on_idle(GisOpenGL *opengl)
 483 {
 484         //g_debug("GisOpenGL: on_idle");
 485         gdk_threads_enter();
 486         g_mutex_lock(opengl->sphere_lock);
 487         if (roam_sphere_split_merge(opengl->sphere))
 488                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 489         g_mutex_unlock(opengl->sphere_lock);
 490         gdk_threads_leave();
 491         return TRUE;
 492 }
 493
 494
 495 /*********************
 496  * GisViewer methods *
 497  *********************/
 498 /**
 499  * gis_opengl_new:
 500  * @plugins: the plugins store to use
 501  * @prefs:   the preferences object to use
 502  *
 503  * Create a new OpenGL renderer.
 504  *
 505  * Returns: the new #GisOpenGL
 506  */
 507 GisViewer *gis_opengl_new(GisPlugins *plugins, GisPrefs *prefs)
 508 {
 509         g_debug("GisOpenGL: new");
 510         GisViewer *opengl = g_object_new(GIS_TYPE_OPENGL, NULL);
 511         gis_viewer_setup(opengl, plugins, prefs);
 512         return opengl;
 513 }
 514
 515 static void gis_opengl_center_position(GisViewer *_opengl, gdouble lat, gdouble lon, gdouble elev)
 516 {
 517         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 518         glRotatef(lon, 0, 1, 0);
 519         glRotatef(-lat, 1, 0, 0);
 520         glTranslatef(0, 0, elev2rad(elev));
 521 }
 522
 523 static void gis_opengl_project(GisViewer *_opengl,
 524                 gdouble lat, gdouble lon, gdouble elev,
 525                 gdouble *px, gdouble *py, gdouble *pz)
 526 {
 527         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 528         gdouble x, y, z;
 529         lle2xyz(lat, lon, elev, &x, &y, &z);
 530         gluProject(x, y, z,
 531                 opengl->sphere->view->model,
 532                 opengl->sphere->view->proj,
 533                 opengl->sphere->view->view,
 534                 px, py, pz);
 535 }
 536
 537 static void gis_opengl_set_height_func(GisViewer *_opengl, GisTile *tile,
 538                 RoamHeightFunc height_func, gpointer user_data, gboolean update)
 539 {
 540         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 541         if (!tile)
 542                 return;
 543         /* TODO: get points? */
 544         g_mutex_lock(opengl->sphere_lock);
 545         GList *triangles = roam_sphere_get_intersect(opengl->sphere, TRUE,
 546                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 547         for (GList *cur = triangles; cur; cur = cur->next) {
 548                 RoamTriangle *tri = cur->data;
 549                 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
 550                 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 551                         if (tile->edge.n >= points[i]->lat && points[i]->lat >= tile->edge.s &&
 552                             tile->edge.e >= points[i]->lon && points[i]->lon >= tile->edge.w) {
 553                                 points[i]->height_func = height_func;
 554                                 points[i]->height_data = user_data;
 555                                 roam_point_update_height(points[i]);
 556                         }
 557                 }
 558         }
 559         g_list_free(triangles);
 560         g_mutex_unlock(opengl->sphere_lock);
 561 }
 562
 563 static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
 564 {
 565         if (!root)
 566                 return;
 567         RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
 568         for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 569                 points[i]->height_func = NULL;
 570                 points[i]->height_data = NULL;
 571                 roam_point_update_height(points[i]);
 572         }
 573         _gis_opengl_clear_height_func_rec(root->kids[0]);
 574         _gis_opengl_clear_height_func_rec(root->kids[1]);
 575 }
 576
 577 static void gis_opengl_clear_height_func(GisViewer *_opengl)
 578 {
 579         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 580         for (int i = 0; i < G_N_ELEMENTS(opengl->sphere->roots); i++)
 581                 _gis_opengl_clear_height_func_rec(opengl->sphere->roots[i]);
 582 }
 583
 584 static gpointer gis_opengl_add(GisViewer *_opengl, GisObject *object,
 585                 gint key, gboolean sort)
 586 {
 587         g_assert(GIS_IS_OPENGL(_opengl));
 588         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 589         _load_object(opengl, object);
 590         struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)key);
 591         if (!level) {
 592                 level = g_new0(struct RenderLevel, 1);
 593                 g_tree_insert(opengl->objects, (gpointer)key, level);
 594         }
 595         GList *list = sort ? &level->sorted : &level->unsorted;
 596         /* Put the link in the list */
 597         GList *next = g_new0(GList, 1);
 598         next->data = object;
 599         next->prev = list;
 600         next->next = list->next;
 601         list->next = next;
 602         return next;
 603 }
 604
 605 static GisObject *gis_opengl_remove(GisViewer *_opengl, gpointer _link)
 606 {
 607         g_assert(GIS_IS_OPENGL(_opengl));
 608         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 609         GList *link = _link;
 610         GisObject *object = link->data;
 611         _unload_object(opengl, object);
 612         /* Just unlink and free it, link->prev is assured */
 613         link->prev->next = link->next;
 614         if (link->next)
 615                 link->next->prev = link->prev;
 616         g_free(link);
 617         g_object_unref(object);
 618         return object;
 619 }
 620
 621 /****************
 622  * GObject code *
 623  ****************/
 624 static int _objects_cmp(gconstpointer _a, gconstpointer _b, gpointer _)
 625 {
 626         gint a = (int)_a, b = (int)_b;
 627         return a < b ? -1 :
 628                a > b ?  1 : 0;
 629 }
 630 static void _objects_free(gpointer value)
 631 {
 632         struct RenderLevel *level = value;
 633         if (level->sorted.next)
 634                 g_list_free(level->sorted.next);
 635         if (level->unsorted.next)
 636                 g_list_free(level->unsorted.next);
 637         g_free(level);
 638 }
 639
 640 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GIS_TYPE_VIEWER);
 641 static void gis_opengl_init(GisOpenGL *opengl)
 642 {
 643         g_debug("GisOpenGL: init");
 644         /* OpenGL setup */
 645         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 646                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 647                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 648         if (!glconfig)
 649                 g_error("Failed to create glconfig");
 650         if (!gtk_widget_set_gl_capability(GTK_WIDGET(opengl),
 651                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 652                 g_error("GL lacks required capabilities");
 653         g_object_unref(glconfig);
 654
 655         opengl->objects = g_tree_new_full(_objects_cmp, NULL, NULL, _objects_free);
 656         opengl->sphere = roam_sphere_new(opengl);
 657         opengl->sphere_lock = g_mutex_new();
 658
 659 #ifndef ROAM_DEBUG
 660         opengl->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33,  (GSourceFunc)on_idle, opengl, NULL);
 661         opengl->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, opengl, NULL);
 662 #endif
 663
 664         gtk_widget_add_events(GTK_WIDGET(opengl), GDK_KEY_PRESS_MASK);
 665         g_signal_connect(opengl, "realize",          G_CALLBACK(on_realize),      NULL);
 666         g_signal_connect(opengl, "configure-event",  G_CALLBACK(on_configure),    NULL);
 667         g_signal_connect(opengl, "expose-event",     G_CALLBACK(on_expose),       NULL);
 668
 669         g_signal_connect(opengl, "key-press-event",  G_CALLBACK(on_key_press),    NULL);
 670
 671         g_signal_connect(opengl, "location-changed", G_CALLBACK(on_view_changed), NULL);
 672         g_signal_connect(opengl, "rotation-changed", G_CALLBACK(on_view_changed), NULL);
 673 }
 674 static void gis_opengl_dispose(GObject *_opengl)
 675 {
 676         g_debug("GisOpenGL: dispose");
 677         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 678         if (opengl->sm_source[0]) {
 679                 g_source_remove(opengl->sm_source[0]);
 680                 opengl->sm_source[0] = 0;
 681         }
 682         if (opengl->sm_source[1]) {
 683                 g_source_remove(opengl->sm_source[1]);
 684                 opengl->sm_source[1] = 0;
 685         }
 686         if (opengl->ue_source) {
 687                 g_source_remove(opengl->ue_source);
 688                 opengl->ue_source = 0;
 689         }
 690         G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_opengl);
 691 }
 692 static void gis_opengl_finalize(GObject *_opengl)
 693 {
 694         g_debug("GisOpenGL: finalize");
 695         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 696         roam_sphere_free(opengl->sphere);
 697         g_tree_destroy(opengl->objects);
 698         g_mutex_free(opengl->sphere_lock);
 699         G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_opengl);
 700 }
 701 static void gis_opengl_class_init(GisOpenGLClass *klass)
 702 {
 703         g_debug("GisOpenGL: class_init");
 704         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 705         gobject_class->finalize = gis_opengl_finalize;
 706         gobject_class->dispose = gis_opengl_dispose;
 707
 708         GisViewerClass *viewer_class = GIS_VIEWER_CLASS(klass);
 709         viewer_class->center_position   = gis_opengl_center_position;
 710         viewer_class->project           = gis_opengl_project;
 711         viewer_class->clear_height_func = gis_opengl_clear_height_func;
 712         viewer_class->set_height_func   = gis_opengl_set_height_func;
 713         viewer_class->add               = gis_opengl_add;
 714         viewer_class->remove            = gis_opengl_remove;
 715 }