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
 237         gint win_width  = GTK_WIDGET(opengl)->allocation.width;
 238         gint win_height = GTK_WIDGET(opengl)->allocation.height;
 239         py = win_height - py;
 240         if (pz > 1)
 241                 return;
 242
 243         //g_debug("GisOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
 244
 245         cairo_surface_t *surface = cairo_get_target(marker->cairo);
 246         gdouble width  = cairo_image_surface_get_width(surface);
 247         gdouble height = cairo_image_surface_get_height(surface);
 248
 249         glMatrixMode(GL_PROJECTION); glLoadIdentity();
 250         glMatrixMode(GL_MODELVIEW);  glLoadIdentity();
 251         glOrtho(0, win_width, win_height, 0, -1, 1);
 252         glTranslated(px - marker->xoff,
 253                      py - marker->yoff, 0);
 254
 255         glDisable(GL_LIGHTING);
 256         glDisable(GL_COLOR_MATERIAL);
 257         glDisable(GL_DEPTH_TEST);
 258         glEnable(GL_TEXTURE_2D);
 259         glBindTexture(GL_TEXTURE_2D, marker->tex);
 260         glDisable(GL_CULL_FACE);
 261         glBegin(GL_QUADS);
 262         glTexCoord2f(1, 0); glVertex3f(width, 0     , 0);
 263         glTexCoord2f(1, 1); glVertex3f(width, height, 0);
 264         glTexCoord2f(0, 1); glVertex3f(0    , height, 0);
 265         glTexCoord2f(0, 0); glVertex3f(0    , 0     , 0);
 266         glEnd();
 267 }
 268
 269 static void _draw_callback(GisOpenGL *opengl, GisCallback *callback)
 270 {
 271         callback->callback(callback, callback->user_data);
 272 }
 273
 274 static void _draw_object(GisOpenGL *opengl, GisObject *object)
 275 {
 276         //g_debug("GisOpenGL: draw_object");
 277         /* Skip out of range objects */
 278         if (object->lod > 0) {
 279                 /* LOD test */
 280                 gdouble eye[3], obj[3];
 281                 gis_viewer_get_location(GIS_VIEWER(opengl), &eye[0], &eye[1], &eye[2]);
 282                 gdouble elev = eye[2];
 283                 lle2xyz(eye[0], eye[1], eye[2], &eye[0], &eye[1], &eye[2]);
 284                 lle2xyz(object->center.lat, object->center.lon, object->center.elev,
 285                         &obj[0], &obj[1], &obj[2]);
 286                 gdouble dist = distd(obj, eye);
 287                 if (object->lod < dist)
 288                         return;
 289
 290                 /* Horizon testing */
 291                 gdouble c = EARTH_R+elev;
 292                 gdouble a = EARTH_R;
 293                 gdouble horizon = sqrt(c*c - a*a);
 294                 if (dist > horizon)
 295                         return;
 296         }
 297
 298         /* Draw */
 299         glMatrixMode(GL_PROJECTION); glPushMatrix();
 300         glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 301         glPushAttrib(GL_ALL_ATTRIB_BITS);
 302         if (GIS_IS_MARKER(object)) {
 303                 _draw_marker(opengl, GIS_MARKER(object));
 304         } else if (GIS_IS_CALLBACK(object)) {
 305                 _draw_callback(opengl, GIS_CALLBACK(object));
 306         } else if (GIS_IS_TILE(object)) {
 307                 glEnable(GL_DEPTH_TEST);
 308                 glDepthFunc(GL_LESS);
 309                 _draw_tiles(opengl, GIS_TILE(object));
 310         }
 311         glPopAttrib();
 312         glMatrixMode(GL_PROJECTION); glPopMatrix();
 313         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 314 }
 315
 316 static void _load_object(GisOpenGL *opengl, GisObject *object)
 317 {
 318         g_debug("GisOpenGL: load_object");
 319         if (GIS_IS_MARKER(object)) {
 320                 GisMarker *marker = GIS_MARKER(object);
 321                 cairo_surface_t *surface = cairo_get_target(marker->cairo);
 322                 gdouble width  = cairo_image_surface_get_width(surface);
 323                 gdouble height = cairo_image_surface_get_height(surface);
 324
 325                 glEnable(GL_TEXTURE_2D);
 326                 glGenTextures(1, &marker->tex);
 327                 glBindTexture(GL_TEXTURE_2D, marker->tex);
 328
 329                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 330                 glPixelStorei(GL_PACK_ALIGNMENT, 1);
 331                 glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
 332                                 cairo_image_surface_get_data(surface));
 333                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 334                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 335                 g_debug("load_texture: %d", marker->tex);
 336         }
 337 }
 338
 339 static void _unload_object(GisOpenGL *opengl, GisObject *object)
 340 {
 341         g_debug("GisOpenGL: unload_object");
 342         if (GIS_IS_MARKER(object)) {
 343                 GisMarker *marker = GIS_MARKER(object);
 344                 glDeleteTextures(1, &marker->tex);
 345         }
 346 }
 347
 348
 349 /*************
 350  * Callbacks *
 351  *************/
 352 /* The unsorted/sroted GLists are blank head nodes,
 353  * This way us we can remove objects from the level just by fixing up links
 354  * I.e. we don't need to do a lookup to remove an object if we have its GList */
 355 struct RenderLevel {
 356         GList unsorted;
 357         GList sorted;
 358 };
 359
 360 static gboolean on_configure(GisOpenGL *opengl, GdkEventConfigure *event, gpointer _)
 361 {
 362         g_debug("GisOpenGL: on_configure");
 363
 364         double width  = GTK_WIDGET(opengl)->allocation.width;
 365         double height = GTK_WIDGET(opengl)->allocation.height;
 366
 367         /* Setup OpenGL Window */
 368         glViewport(0, 0, width, height);
 369         glMatrixMode(GL_PROJECTION);
 370         glLoadIdentity();
 371         double ang = atan(height/FOV_DIST);
 372         gluPerspective(rad2deg(ang)*2, width/height, 1, 10*EARTH_R);
 373
 374 #ifndef ROAM_DEBUG
 375         g_mutex_lock(opengl->sphere_lock);
 376         roam_sphere_update_errors(opengl->sphere);
 377         g_mutex_unlock(opengl->sphere_lock);
 378 #endif
 379
 380         return FALSE;
 381 }
 382
 383 static void on_realize(GisOpenGL *opengl, gpointer _)
 384 {
 385         g_debug("GisOpenGL: on_realize");
 386
 387         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(opengl));
 388         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 389         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 390                 g_assert_not_reached();
 391
 392         _set_visuals(opengl);
 393         on_configure(opengl, NULL, NULL);
 394 }
 395
 396 static gboolean _draw_level(gpointer key, gpointer value, gpointer user_data)
 397 {
 398         g_debug("GisOpenGL: _draw_level - level=%-4d", (int)key);
 399         GisOpenGL *opengl = user_data;
 400         struct RenderLevel *level = value;
 401         int nsorted = 0, nunsorted = 0;
 402         GList *cur = NULL;
 403
 404         /* Draw opaque objects without sorting */
 405         glDepthMask(TRUE);
 406         glClear(GL_DEPTH_BUFFER_BIT);
 407         for (cur = level->unsorted.next; cur; cur = cur->next, nunsorted++)
 408                 _draw_object(opengl, GIS_OBJECT(cur->data));
 409
 410         /* Freeze depth buffer and draw transparent objects sorted */
 411         /* TODO: sorting */
 412         //glDepthMask(FALSE);
 413         glAlphaFunc(GL_GREATER, 0.1);
 414         for (cur = level->sorted.next; cur; cur = cur->next, nsorted++)
 415                 _draw_object(opengl, GIS_OBJECT(cur->data));
 416
 417         /* TODO: Prune empty levels */
 418
 419         g_debug("GisOpenGL: _draw_level - drew %d,%d objects",
 420                         nunsorted, nsorted);
 421         return FALSE;
 422 }
 423
 424 static gboolean on_expose(GisOpenGL *opengl, GdkEventExpose *event, gpointer _)
 425 {
 426         g_debug("GisOpenGL: on_expose - begin");
 427
 428         glClear(GL_COLOR_BUFFER_BIT);
 429
 430         _set_visuals(opengl);
 431 #ifdef ROAM_DEBUG
 432         glColor4f(0.0, 0.0, 9.0, 0.6);
 433         glDisable(GL_TEXTURE_2D);
 434         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 435         roam_sphere_draw(opengl->sphere);
 436         //roam_sphere_draw_normals(opengl->sphere);
 437 #else
 438         g_tree_foreach(opengl->objects, _draw_level, opengl);
 439         if (opengl->wireframe) {
 440                 glClear(GL_DEPTH_BUFFER_BIT);
 441                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 442                 roam_sphere_draw(opengl->sphere);
 443         }
 444 #endif
 445
 446         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 447         gdk_gl_drawable_swap_buffers(gldrawable);
 448
 449         g_debug("GisOpenGL: on_expose - end\n");
 450         return FALSE;
 451 }
 452
 453 static gboolean on_key_press(GisOpenGL *opengl, GdkEventKey *event, gpointer _)
 454 {
 455         g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 456                         event->keyval, event->state, GDK_plus);
 457
 458         guint kv = event->keyval;
 459         gdk_threads_leave();
 460         /* Testing */
 461         if (kv == GDK_w) {
 462                 opengl->wireframe = !opengl->wireframe;
 463                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 464         }
 465 #ifdef ROAM_DEBUG
 466         else if (kv == GDK_n) roam_sphere_split_one(opengl->sphere);
 467         else if (kv == GDK_p) roam_sphere_merge_one(opengl->sphere);
 468         else if (kv == GDK_r) roam_sphere_split_merge(opengl->sphere);
 469         else if (kv == GDK_u) roam_sphere_update_errors(opengl->sphere);
 470         gdk_threads_enter();
 471         gtk_widget_queue_draw(GTK_WIDGET(opengl));
 472 #else
 473         gdk_threads_enter();
 474 #endif
 475         return FALSE;
 476 }
 477
 478 static gboolean _update_errors_cb(gpointer _opengl)
 479 {
 480         GisOpenGL *opengl = _opengl;
 481         roam_sphere_update_errors(opengl->sphere);
 482         opengl->ue_source = 0;
 483         return FALSE;
 484 }
 485 static void on_view_changed(GisOpenGL *opengl,
 486                 gdouble _1, gdouble _2, gdouble _3)
 487 {
 488         g_debug("GisOpenGL: on_view_changed");
 489         _set_visuals(opengl);
 490 #ifndef ROAM_DEBUG
 491         if (!opengl->ue_source)
 492                 opengl->ue_source = g_idle_add_full(G_PRIORITY_HIGH_IDLE+30,
 493                                 _update_errors_cb, opengl, NULL);
 494         //roam_sphere_update_errors(opengl->sphere);
 495 #endif
 496 }
 497
 498 static gboolean on_idle(GisOpenGL *opengl)
 499 {
 500         //g_debug("GisOpenGL: on_idle");
 501         gdk_threads_enter();
 502         g_mutex_lock(opengl->sphere_lock);
 503         if (roam_sphere_split_merge(opengl->sphere))
 504                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 505         g_mutex_unlock(opengl->sphere_lock);
 506         gdk_threads_leave();
 507         return TRUE;
 508 }
 509
 510
 511 /*********************
 512  * GisViewer methods *
 513  *********************/
 514 /**
 515  * gis_opengl_new:
 516  * @plugins: the plugins store to use
 517  * @prefs:   the preferences object to use
 518  *
 519  * Create a new OpenGL renderer.
 520  *
 521  * Returns: the new #GisOpenGL
 522  */
 523 GisViewer *gis_opengl_new(GisPlugins *plugins, GisPrefs *prefs)
 524 {
 525         g_debug("GisOpenGL: new");
 526         GisViewer *opengl = g_object_new(GIS_TYPE_OPENGL, NULL);
 527         gis_viewer_setup(opengl, plugins, prefs);
 528         return opengl;
 529 }
 530
 531 static void gis_opengl_center_position(GisViewer *_opengl, gdouble lat, gdouble lon, gdouble elev)
 532 {
 533         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 534         glRotatef(lon, 0, 1, 0);
 535         glRotatef(-lat, 1, 0, 0);
 536         glTranslatef(0, 0, elev2rad(elev));
 537 }
 538
 539 static void gis_opengl_project(GisViewer *_opengl,
 540                 gdouble lat, gdouble lon, gdouble elev,
 541                 gdouble *px, gdouble *py, gdouble *pz)
 542 {
 543         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 544         gdouble x, y, z;
 545         lle2xyz(lat, lon, elev, &x, &y, &z);
 546         gluProject(x, y, z,
 547                 opengl->sphere->view->model,
 548                 opengl->sphere->view->proj,
 549                 opengl->sphere->view->view,
 550                 px, py, pz);
 551 }
 552
 553 static void gis_opengl_set_height_func(GisViewer *_opengl, GisTile *tile,
 554                 RoamHeightFunc height_func, gpointer user_data, gboolean update)
 555 {
 556         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 557         if (!tile)
 558                 return;
 559         /* TODO: get points? */
 560         g_mutex_lock(opengl->sphere_lock);
 561         GList *triangles = roam_sphere_get_intersect(opengl->sphere, TRUE,
 562                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 563         for (GList *cur = triangles; cur; cur = cur->next) {
 564                 RoamTriangle *tri = cur->data;
 565                 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
 566                 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 567                         if (tile->edge.n >= points[i]->lat && points[i]->lat >= tile->edge.s &&
 568                             tile->edge.e >= points[i]->lon && points[i]->lon >= tile->edge.w) {
 569                                 points[i]->height_func = height_func;
 570                                 points[i]->height_data = user_data;
 571                                 roam_point_update_height(points[i]);
 572                         }
 573                 }
 574         }
 575         g_list_free(triangles);
 576         g_mutex_unlock(opengl->sphere_lock);
 577 }
 578
 579 static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
 580 {
 581         if (!root)
 582                 return;
 583         RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
 584         for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 585                 points[i]->height_func = NULL;
 586                 points[i]->height_data = NULL;
 587                 roam_point_update_height(points[i]);
 588         }
 589         _gis_opengl_clear_height_func_rec(root->kids[0]);
 590         _gis_opengl_clear_height_func_rec(root->kids[1]);
 591 }
 592
 593 static void gis_opengl_clear_height_func(GisViewer *_opengl)
 594 {
 595         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 596         for (int i = 0; i < G_N_ELEMENTS(opengl->sphere->roots); i++)
 597                 _gis_opengl_clear_height_func_rec(opengl->sphere->roots[i]);
 598 }
 599
 600 static gpointer gis_opengl_add(GisViewer *_opengl, GisObject *object,
 601                 gint key, gboolean sort)
 602 {
 603         g_assert(GIS_IS_OPENGL(_opengl));
 604         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 605         _load_object(opengl, object);
 606         struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)key);
 607         if (!level) {
 608                 level = g_new0(struct RenderLevel, 1);
 609                 g_tree_insert(opengl->objects, (gpointer)key, level);
 610         }
 611         GList *list = sort ? &level->sorted : &level->unsorted;
 612         /* Put the link in the list */
 613         GList *next = g_new0(GList, 1);
 614         next->data = object;
 615         next->prev = list;
 616         next->next = list->next;
 617         list->next = next;
 618         return next;
 619 }
 620
 621 static GisObject *gis_opengl_remove(GisViewer *_opengl, gpointer _link)
 622 {
 623         g_assert(GIS_IS_OPENGL(_opengl));
 624         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 625         GList *link = _link;
 626         GisObject *object = link->data;
 627         _unload_object(opengl, object);
 628         /* Just unlink and free it, link->prev is assured */
 629         link->prev->next = link->next;
 630         if (link->next)
 631                 link->next->prev = link->prev;
 632         g_free(link);
 633         g_object_unref(object);
 634         return object;
 635 }
 636
 637 /****************
 638  * GObject code *
 639  ****************/
 640 static int _objects_cmp(gconstpointer _a, gconstpointer _b, gpointer _)
 641 {
 642         gint a = (int)_a, b = (int)_b;
 643         return a < b ? -1 :
 644                a > b ?  1 : 0;
 645 }
 646 static void _objects_free(gpointer value)
 647 {
 648         struct RenderLevel *level = value;
 649         if (level->sorted.next)
 650                 g_list_free(level->sorted.next);
 651         if (level->unsorted.next)
 652                 g_list_free(level->unsorted.next);
 653         g_free(level);
 654 }
 655
 656 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GIS_TYPE_VIEWER);
 657 static void gis_opengl_init(GisOpenGL *opengl)
 658 {
 659         g_debug("GisOpenGL: init");
 660         /* OpenGL setup */
 661         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 662                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 663                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 664         if (!glconfig)
 665                 g_error("Failed to create glconfig");
 666         if (!gtk_widget_set_gl_capability(GTK_WIDGET(opengl),
 667                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 668                 g_error("GL lacks required capabilities");
 669         g_object_unref(glconfig);
 670
 671         opengl->objects = g_tree_new_full(_objects_cmp, NULL, NULL, _objects_free);
 672         opengl->sphere = roam_sphere_new(opengl);
 673         opengl->sphere_lock = g_mutex_new();
 674
 675 #ifndef ROAM_DEBUG
 676         opengl->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33,  (GSourceFunc)on_idle, opengl, NULL);
 677         opengl->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, opengl, NULL);
 678 #endif
 679
 680         gtk_widget_add_events(GTK_WIDGET(opengl), GDK_KEY_PRESS_MASK);
 681         g_signal_connect(opengl, "realize",          G_CALLBACK(on_realize),      NULL);
 682         g_signal_connect(opengl, "configure-event",  G_CALLBACK(on_configure),    NULL);
 683         g_signal_connect(opengl, "expose-event",     G_CALLBACK(on_expose),       NULL);
 684
 685         g_signal_connect(opengl, "key-press-event",  G_CALLBACK(on_key_press),    NULL);
 686
 687         g_signal_connect(opengl, "location-changed", G_CALLBACK(on_view_changed), NULL);
 688         g_signal_connect(opengl, "rotation-changed", G_CALLBACK(on_view_changed), NULL);
 689 }
 690 static void gis_opengl_dispose(GObject *_opengl)
 691 {
 692         g_debug("GisOpenGL: dispose");
 693         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 694         if (opengl->sm_source[0]) {
 695                 g_source_remove(opengl->sm_source[0]);
 696                 opengl->sm_source[0] = 0;
 697         }
 698         if (opengl->sm_source[1]) {
 699                 g_source_remove(opengl->sm_source[1]);
 700                 opengl->sm_source[1] = 0;
 701         }
 702         if (opengl->ue_source) {
 703                 g_source_remove(opengl->ue_source);
 704                 opengl->ue_source = 0;
 705         }
 706         G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_opengl);
 707 }
 708 static void gis_opengl_finalize(GObject *_opengl)
 709 {
 710         g_debug("GisOpenGL: finalize");
 711         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 712         roam_sphere_free(opengl->sphere);
 713         g_tree_destroy(opengl->objects);
 714         g_mutex_free(opengl->sphere_lock);
 715         G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_opengl);
 716 }
 717 static void gis_opengl_class_init(GisOpenGLClass *klass)
 718 {
 719         g_debug("GisOpenGL: class_init");
 720         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 721         gobject_class->finalize = gis_opengl_finalize;
 722         gobject_class->dispose = gis_opengl_dispose;
 723
 724         GisViewerClass *viewer_class = GIS_VIEWER_CLASS(klass);
 725         viewer_class->center_position   = gis_opengl_center_position;
 726         viewer_class->project           = gis_opengl_project;
 727         viewer_class->clear_height_func = gis_opengl_clear_height_func;
 728         viewer_class->set_height_func   = gis_opengl_set_height_func;
 729         viewer_class->add               = gis_opengl_add;
 730         viewer_class->remove            = gis_opengl_remove;
 731 }