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         g_mutex_lock(opengl->sphere_lock);
 119         roam_sphere_update_view(opengl->sphere);
 120         g_mutex_unlock(opengl->sphere_lock);
 121 }
 122
 123
 124 /********************
 125  * Object handleing *
 126  ********************/
 127 static void _draw_tile(GisOpenGL *opengl, GisTile *tile, GList *triangles)
 128 {
 129         if (!tile || !tile->data)
 130                 return;
 131         if (!triangles)
 132                 g_warning("GisOpenGL: _draw_tiles - No triangles to draw: edges=%f,%f,%f,%f",
 133                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 134         //g_message("drawing %4d triangles for tile edges=%7.2f,%7.2f,%7.2f,%7.2f",
 135         //              g_list_length(triangles), tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 136         gdouble n = tile->edge.n;
 137         gdouble s = tile->edge.s;
 138         gdouble e = tile->edge.e;
 139         gdouble w = tile->edge.w;
 140
 141         gdouble londist = e - w;
 142         gdouble latdist = n - s;
 143
 144         gdouble xscale = tile->coords.e - tile->coords.w;
 145         gdouble yscale = tile->coords.s - tile->coords.n;
 146
 147         for (GList *cur = triangles; cur; cur = cur->next) {
 148                 RoamTriangle *tri = cur->data;
 149
 150                 gdouble lat[3] = {tri->p.r->lat, tri->p.m->lat, tri->p.l->lat};
 151                 gdouble lon[3] = {tri->p.r->lon, tri->p.m->lon, tri->p.l->lon};
 152
 153                 if (lon[0] < -90 || lon[1] < -90 || lon[2] < -90) {
 154                         if (lon[0] > 90) lon[0] -= 360;
 155                         if (lon[1] > 90) lon[1] -= 360;
 156                         if (lon[2] > 90) lon[2] -= 360;
 157                 }
 158
 159                 gdouble xy[3][2] = {
 160                         {(lon[0]-w)/londist, 1-(lat[0]-s)/latdist},
 161                         {(lon[1]-w)/londist, 1-(lat[1]-s)/latdist},
 162                         {(lon[2]-w)/londist, 1-(lat[2]-s)/latdist},
 163                 };
 164
 165                 //if ((lat[0] == 90 && (xy[0][0] < 0 || xy[0][0] > 1)) ||
 166                 //    (lat[1] == 90 && (xy[1][0] < 0 || xy[1][0] > 1)) ||
 167                 //    (lat[2] == 90 && (xy[2][0] < 0 || xy[2][0] > 1)))
 168                 //      g_message("w,e=%4.f,%4.f   "
 169                 //                "lat,lon,x,y="
 170                 //                "%4.1f,%4.0f,%4.2f,%4.2f   "
 171                 //                "%4.1f,%4.0f,%4.2f,%4.2f   "
 172                 //                "%4.1f,%4.0f,%4.2f,%4.2f   ",
 173                 //              w,e,
 174                 //              lat[0], lon[0], xy[0][0], xy[0][1],
 175                 //              lat[1], lon[1], xy[1][0], xy[1][1],
 176                 //              lat[2], lon[2], xy[2][0], xy[2][1]);
 177
 178                 /* Fix poles */
 179                 if (lat[0] == 90 || lat[0] == -90) xy[0][0] = 0.5;
 180                 if (lat[1] == 90 || lat[1] == -90) xy[1][0] = 0.5;
 181                 if (lat[2] == 90 || lat[2] == -90) xy[2][0] = 0.5;
 182
 183                 /* Scale to tile coords */
 184                 for (int i = 0; i < 3; i++) {
 185                         xy[i][0] = tile->coords.w + xy[i][0]*xscale;
 186                         xy[i][1] = tile->coords.n + xy[i][1]*yscale;
 187                 }
 188
 189                 glEnable(GL_TEXTURE_2D);
 190                 glEnable(GL_POLYGON_OFFSET_FILL);
 191                 glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
 192                 glPolygonOffset(0, -tile->zindex);
 193                 glBegin(GL_TRIANGLES);
 194                 glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
 195                 glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
 196                 glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
 197                 glEnd();
 198         }
 199 }
 200
 201 static void _draw_tiles(GisOpenGL *opengl, GisTile *tile)
 202 {
 203         /* Only draw children if possible */
 204         gboolean has_children = FALSE;
 205         GisTile *child;
 206         gis_tile_foreach(tile, child)
 207                 if (child && child->data)
 208                         has_children = TRUE;
 209
 210         GList *triangles = NULL;
 211         if (has_children) {
 212                 /* TODO: simplify this */
 213                 const gdouble rows = G_N_ELEMENTS(tile->children);
 214                 const gdouble cols = G_N_ELEMENTS(tile->children[0]);
 215                 const gdouble lat_dist = tile->edge.n - tile->edge.s;
 216                 const gdouble lon_dist = tile->edge.e - tile->edge.w;
 217                 const gdouble lat_step = lat_dist / rows;
 218                 const gdouble lon_step = lon_dist / cols;
 219                 int row, col;
 220                 gis_tile_foreach_index(tile, row, col) {
 221                         GisTile *child = tile->children[row][col];
 222                         if (child && child->data) {
 223                                 _draw_tiles(opengl, child);
 224                         } else {
 225                                 const gdouble n = tile->edge.n-(lat_step*(row+0));
 226                                 const gdouble s = tile->edge.n-(lat_step*(row+1));
 227                                 const gdouble e = tile->edge.w+(lon_step*(col+1));
 228                                 const gdouble w = tile->edge.w+(lon_step*(col+0));
 229                                 GList *these = roam_sphere_get_intersect(opengl->sphere,
 230                                                 FALSE, n, s, e, w);
 231                                 triangles = g_list_concat(triangles, these);
 232                         }
 233                 }
 234         } else {
 235                 triangles = roam_sphere_get_intersect(opengl->sphere, FALSE,
 236                                 tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 237         }
 238         if (triangles)
 239                 _draw_tile(opengl, tile, triangles);
 240         g_list_free(triangles);
 241 }
 242
 243 static void _draw_marker(GisOpenGL *opengl, GisMarker *marker)
 244 {
 245         GisPoint *point = gis_object_center(marker);
 246         gdouble px, py, pz;
 247         gis_viewer_project(GIS_VIEWER(opengl),
 248                         point->lat, point->lon, point->elev,
 249                         &px, &py, &pz);
 250
 251         gint win_width  = GTK_WIDGET(opengl)->allocation.width;
 252         gint win_height = GTK_WIDGET(opengl)->allocation.height;
 253         py = win_height - py;
 254         if (pz > 1)
 255                 return;
 256
 257         //g_debug("GisOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
 258
 259         cairo_surface_t *surface = cairo_get_target(marker->cairo);
 260         gdouble width  = cairo_image_surface_get_width(surface);
 261         gdouble height = cairo_image_surface_get_height(surface);
 262
 263         glMatrixMode(GL_PROJECTION); glLoadIdentity();
 264         glMatrixMode(GL_MODELVIEW);  glLoadIdentity();
 265         glOrtho(0, win_width, win_height, 0, -1, 1);
 266         glTranslated(px - marker->xoff,
 267                      py - marker->yoff, 0);
 268
 269         glDisable(GL_LIGHTING);
 270         glDisable(GL_COLOR_MATERIAL);
 271         glDisable(GL_DEPTH_TEST);
 272         glEnable(GL_TEXTURE_2D);
 273         glBindTexture(GL_TEXTURE_2D, marker->tex);
 274         glDisable(GL_CULL_FACE);
 275         glBegin(GL_QUADS);
 276         glTexCoord2f(1, 0); glVertex3f(width, 0     , 0);
 277         glTexCoord2f(1, 1); glVertex3f(width, height, 0);
 278         glTexCoord2f(0, 1); glVertex3f(0    , height, 0);
 279         glTexCoord2f(0, 0); glVertex3f(0    , 0     , 0);
 280         glEnd();
 281 }
 282
 283 static void _draw_callback(GisOpenGL *opengl, GisCallback *callback)
 284 {
 285         callback->callback(callback, callback->user_data);
 286 }
 287
 288 static void _draw_object(GisOpenGL *opengl, GisObject *object)
 289 {
 290         //g_debug("GisOpenGL: draw_object");
 291         /* Skip out of range objects */
 292         if (object->lod > 0) {
 293                 /* LOD test */
 294                 gdouble eye[3], obj[3];
 295                 gis_viewer_get_location(GIS_VIEWER(opengl), &eye[0], &eye[1], &eye[2]);
 296                 gdouble elev = eye[2];
 297                 lle2xyz(eye[0], eye[1], eye[2], &eye[0], &eye[1], &eye[2]);
 298                 lle2xyz(object->center.lat, object->center.lon, object->center.elev,
 299                         &obj[0], &obj[1], &obj[2]);
 300                 gdouble dist = distd(obj, eye);
 301                 if (object->lod < dist)
 302                         return;
 303
 304                 /* Horizon testing */
 305                 gdouble c = EARTH_R+elev;
 306                 gdouble a = EARTH_R;
 307                 gdouble horizon = sqrt(c*c - a*a);
 308                 if (dist > horizon)
 309                         return;
 310         }
 311
 312         /* Draw */
 313         glMatrixMode(GL_PROJECTION); glPushMatrix();
 314         glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 315         glPushAttrib(GL_ALL_ATTRIB_BITS);
 316         if (GIS_IS_MARKER(object)) {
 317                 _draw_marker(opengl, GIS_MARKER(object));
 318         } else if (GIS_IS_CALLBACK(object)) {
 319                 _draw_callback(opengl, GIS_CALLBACK(object));
 320         } else if (GIS_IS_TILE(object)) {
 321                 glEnable(GL_DEPTH_TEST);
 322                 glDepthFunc(GL_LESS);
 323                 g_mutex_lock(opengl->sphere_lock);
 324                 _draw_tiles(opengl, GIS_TILE(object));
 325                 g_mutex_unlock(opengl->sphere_lock);
 326         }
 327         glPopAttrib();
 328         glMatrixMode(GL_PROJECTION); glPopMatrix();
 329         glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 330 }
 331
 332 static void _load_object(GisOpenGL *opengl, GisObject *object)
 333 {
 334         //g_debug("GisOpenGL: load_object");
 335         if (GIS_IS_MARKER(object)) {
 336                 GisMarker *marker = GIS_MARKER(object);
 337                 cairo_surface_t *surface = cairo_get_target(marker->cairo);
 338                 gdouble width  = cairo_image_surface_get_width(surface);
 339                 gdouble height = cairo_image_surface_get_height(surface);
 340
 341                 glEnable(GL_TEXTURE_2D);
 342                 glGenTextures(1, &marker->tex);
 343                 glBindTexture(GL_TEXTURE_2D, marker->tex);
 344
 345                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 346                 glPixelStorei(GL_PACK_ALIGNMENT, 1);
 347                 glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
 348                                 cairo_image_surface_get_data(surface));
 349                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 350                 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 351                 //g_debug("load_texture: %d", marker->tex);
 352         }
 353 }
 354
 355 static void _unload_object(GisOpenGL *opengl, GisObject *object)
 356 {
 357         //g_debug("GisOpenGL: unload_object");
 358         if (GIS_IS_MARKER(object)) {
 359                 GisMarker *marker = GIS_MARKER(object);
 360                 glDeleteTextures(1, &marker->tex);
 361         }
 362 }
 363
 364
 365 /*************
 366  * Callbacks *
 367  *************/
 368 /* The unsorted/sroted GLists are blank head nodes,
 369  * This way us we can remove objects from the level just by fixing up links
 370  * I.e. we don't need to do a lookup to remove an object if we have its GList */
 371 struct RenderLevel {
 372         GList unsorted;
 373         GList sorted;
 374 };
 375
 376 static gboolean on_configure(GisOpenGL *opengl, GdkEventConfigure *event, gpointer _)
 377 {
 378         g_debug("GisOpenGL: on_configure");
 379
 380         double width  = GTK_WIDGET(opengl)->allocation.width;
 381         double height = GTK_WIDGET(opengl)->allocation.height;
 382
 383         /* Setup OpenGL Window */
 384         glViewport(0, 0, width, height);
 385         glMatrixMode(GL_PROJECTION);
 386         glLoadIdentity();
 387         double ang = atan(height/FOV_DIST);
 388         gluPerspective(rad2deg(ang)*2, width/height, 1000, 10*EARTH_R);
 389
 390 #ifndef ROAM_DEBUG
 391         g_mutex_lock(opengl->sphere_lock);
 392         roam_sphere_update_errors(opengl->sphere);
 393         g_mutex_unlock(opengl->sphere_lock);
 394 #endif
 395
 396         return FALSE;
 397 }
 398
 399 static void on_realize(GisOpenGL *opengl, gpointer _)
 400 {
 401         g_debug("GisOpenGL: on_realize");
 402
 403         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(opengl));
 404         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 405         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 406                 g_assert_not_reached();
 407
 408         _set_visuals(opengl);
 409         on_configure(opengl, NULL, NULL);
 410 }
 411
 412 static gboolean _draw_level(gpointer key, gpointer value, gpointer user_data)
 413 {
 414         g_debug("GisOpenGL: _draw_level - level=%-4d", (int)key);
 415         GisOpenGL *opengl = user_data;
 416         struct RenderLevel *level = value;
 417         int nsorted = 0, nunsorted = 0;
 418         GList *cur = NULL;
 419
 420         /* Draw opaque objects without sorting */
 421         glDepthMask(TRUE);
 422         glClear(GL_DEPTH_BUFFER_BIT);
 423         for (cur = level->unsorted.next; cur; cur = cur->next, nunsorted++)
 424                 _draw_object(opengl, GIS_OBJECT(cur->data));
 425
 426         /* Freeze depth buffer and draw transparent objects sorted */
 427         /* TODO: sorting */
 428         //glDepthMask(FALSE);
 429         glAlphaFunc(GL_GREATER, 0.1);
 430         for (cur = level->sorted.next; cur; cur = cur->next, nsorted++)
 431                 _draw_object(opengl, GIS_OBJECT(cur->data));
 432
 433         /* TODO: Prune empty levels */
 434
 435         g_debug("GisOpenGL: _draw_level - drew %d,%d objects",
 436                         nunsorted, nsorted);
 437         return FALSE;
 438 }
 439
 440 static gboolean on_expose(GisOpenGL *opengl, GdkEventExpose *event, gpointer _)
 441 {
 442         g_debug("GisOpenGL: on_expose - begin");
 443
 444         glClear(GL_COLOR_BUFFER_BIT);
 445
 446         _set_visuals(opengl);
 447 #ifdef ROAM_DEBUG
 448         glColor4f(0.0, 0.0, 9.0, 0.6);
 449         glDisable(GL_TEXTURE_2D);
 450         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 451         roam_sphere_draw(opengl->sphere);
 452         //roam_sphere_draw_normals(opengl->sphere);
 453 #else
 454         g_mutex_lock(opengl->objects_lock);
 455         g_tree_foreach(opengl->objects, _draw_level, opengl);
 456         g_mutex_unlock(opengl->objects_lock);
 457         if (opengl->wireframe) {
 458                 glClear(GL_DEPTH_BUFFER_BIT);
 459                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 460                 roam_sphere_draw(opengl->sphere);
 461         }
 462 #endif
 463
 464         GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
 465         gdk_gl_drawable_swap_buffers(gldrawable);
 466
 467         g_debug("GisOpenGL: on_expose - end\n");
 468         return FALSE;
 469 }
 470
 471 static gboolean on_key_press(GisOpenGL *opengl, GdkEventKey *event, gpointer _)
 472 {
 473         g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
 474                         event->keyval, event->state, GDK_plus);
 475
 476         guint kv = event->keyval;
 477         /* Testing */
 478         if (kv == GDK_w) {
 479                 opengl->wireframe = !opengl->wireframe;
 480                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 481         }
 482 #ifdef ROAM_DEBUG
 483         else if (kv == GDK_n) roam_sphere_split_one(opengl->sphere);
 484         else if (kv == GDK_p) roam_sphere_merge_one(opengl->sphere);
 485         else if (kv == GDK_r) roam_sphere_split_merge(opengl->sphere);
 486         else if (kv == GDK_u) roam_sphere_update_errors(opengl->sphere);
 487         gtk_widget_queue_draw(GTK_WIDGET(opengl));
 488 #endif
 489         return FALSE;
 490 }
 491
 492 static gboolean _update_errors_cb(gpointer _opengl)
 493 {
 494         GisOpenGL *opengl = _opengl;
 495         g_mutex_lock(opengl->sphere_lock);
 496         roam_sphere_update_errors(opengl->sphere);
 497         g_mutex_unlock(opengl->sphere_lock);
 498         opengl->ue_source = 0;
 499         return FALSE;
 500 }
 501 static void on_view_changed(GisOpenGL *opengl,
 502                 gdouble _1, gdouble _2, gdouble _3)
 503 {
 504         g_debug("GisOpenGL: on_view_changed");
 505         _set_visuals(opengl);
 506 #ifndef ROAM_DEBUG
 507         if (!opengl->ue_source)
 508                 opengl->ue_source = g_idle_add_full(G_PRIORITY_HIGH_IDLE+30,
 509                                 _update_errors_cb, opengl, NULL);
 510         //roam_sphere_update_errors(opengl->sphere);
 511 #endif
 512 }
 513
 514 static gboolean on_idle(GisOpenGL *opengl)
 515 {
 516         //g_debug("GisOpenGL: on_idle");
 517         g_mutex_lock(opengl->sphere_lock);
 518         if (roam_sphere_split_merge(opengl->sphere))
 519                 gtk_widget_queue_draw(GTK_WIDGET(opengl));
 520         g_mutex_unlock(opengl->sphere_lock);
 521         return TRUE;
 522 }
 523
 524
 525 /*********************
 526  * GisViewer methods *
 527  *********************/
 528 /**
 529  * gis_opengl_new:
 530  * @plugins: the plugins store to use
 531  * @prefs:   the preferences object to use
 532  *
 533  * Create a new OpenGL renderer.
 534  *
 535  * Returns: the new #GisOpenGL
 536  */
 537 GisViewer *gis_opengl_new(GisPlugins *plugins, GisPrefs *prefs)
 538 {
 539         g_debug("GisOpenGL: new");
 540         GisViewer *opengl = g_object_new(GIS_TYPE_OPENGL, NULL);
 541         gis_viewer_setup(opengl, plugins, prefs);
 542         return opengl;
 543 }
 544
 545 static void gis_opengl_center_position(GisViewer *_opengl, gdouble lat, gdouble lon, gdouble elev)
 546 {
 547         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 548         glRotatef(lon, 0, 1, 0);
 549         glRotatef(-lat, 1, 0, 0);
 550         glTranslatef(0, 0, elev2rad(elev));
 551 }
 552
 553 static void gis_opengl_project(GisViewer *_opengl,
 554                 gdouble lat, gdouble lon, gdouble elev,
 555                 gdouble *px, gdouble *py, gdouble *pz)
 556 {
 557         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 558         gdouble x, y, z;
 559         lle2xyz(lat, lon, elev, &x, &y, &z);
 560         gluProject(x, y, z,
 561                 opengl->sphere->view->model,
 562                 opengl->sphere->view->proj,
 563                 opengl->sphere->view->view,
 564                 px, py, pz);
 565 }
 566
 567 static void gis_opengl_set_height_func(GisViewer *_opengl, GisTile *tile,
 568                 RoamHeightFunc height_func, gpointer user_data, gboolean update)
 569 {
 570         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 571         if (!tile)
 572                 return;
 573         /* TODO: get points? */
 574         g_mutex_lock(opengl->sphere_lock);
 575         GList *triangles = roam_sphere_get_intersect(opengl->sphere, TRUE,
 576                         tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
 577         for (GList *cur = triangles; cur; cur = cur->next) {
 578                 RoamTriangle *tri = cur->data;
 579                 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
 580                 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 581                         if (tile->edge.n >= points[i]->lat && points[i]->lat >= tile->edge.s &&
 582                             tile->edge.e >= points[i]->lon && points[i]->lon >= tile->edge.w) {
 583                                 points[i]->height_func = height_func;
 584                                 points[i]->height_data = user_data;
 585                                 roam_point_update_height(points[i]);
 586                         }
 587                 }
 588         }
 589         g_list_free(triangles);
 590         g_mutex_unlock(opengl->sphere_lock);
 591 }
 592
 593 static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
 594 {
 595         if (!root)
 596                 return;
 597         RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
 598         for (int i = 0; i < G_N_ELEMENTS(points); i++) {
 599                 points[i]->height_func = NULL;
 600                 points[i]->height_data = NULL;
 601                 roam_point_update_height(points[i]);
 602         }
 603         _gis_opengl_clear_height_func_rec(root->kids[0]);
 604         _gis_opengl_clear_height_func_rec(root->kids[1]);
 605 }
 606
 607 static void gis_opengl_clear_height_func(GisViewer *_opengl)
 608 {
 609         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 610         for (int i = 0; i < G_N_ELEMENTS(opengl->sphere->roots); i++)
 611                 _gis_opengl_clear_height_func_rec(opengl->sphere->roots[i]);
 612 }
 613
 614 static gpointer gis_opengl_add(GisViewer *_opengl, GisObject *object,
 615                 gint key, gboolean sort)
 616 {
 617         g_assert(GIS_IS_OPENGL(_opengl));
 618         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 619         g_mutex_lock(opengl->objects_lock);
 620         _load_object(opengl, object);
 621         struct RenderLevel *level = g_tree_lookup(opengl->objects, (gpointer)key);
 622         if (!level) {
 623                 level = g_new0(struct RenderLevel, 1);
 624                 g_tree_insert(opengl->objects, (gpointer)key, level);
 625         }
 626         GList *list = sort ? &level->sorted : &level->unsorted;
 627         /* Put the link in the list */
 628         GList *link = g_new0(GList, 1);
 629         link->data = object;
 630         link->prev = list;
 631         link->next = list->next;
 632         if (list->next)
 633                 list->next->prev = link;
 634         list->next = link;
 635         g_mutex_unlock(opengl->objects_lock);
 636         return link;
 637 }
 638
 639 static GisObject *gis_opengl_remove(GisViewer *_opengl, gpointer _link)
 640 {
 641         g_assert(GIS_IS_OPENGL(_opengl));
 642         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 643         g_mutex_lock(opengl->objects_lock);
 644         GList *link = _link;
 645         GisObject *object = link->data;
 646         _unload_object(opengl, object);
 647         /* Just unlink and free it, link->prev is assured */
 648         link->prev->next = link->next;
 649         if (link->next)
 650                 link->next->prev = link->prev;
 651         g_free(link);
 652         g_object_unref(object);
 653         g_mutex_unlock(opengl->objects_lock);
 654         return object;
 655 }
 656
 657 /****************
 658  * GObject code *
 659  ****************/
 660 static int _objects_cmp(gconstpointer _a, gconstpointer _b, gpointer _)
 661 {
 662         gint a = (int)_a, b = (int)_b;
 663         return a < b ? -1 :
 664                a > b ?  1 : 0;
 665 }
 666 static void _objects_free(gpointer value)
 667 {
 668         struct RenderLevel *level = value;
 669         if (level->sorted.next)
 670                 g_list_free(level->sorted.next);
 671         if (level->unsorted.next)
 672                 g_list_free(level->unsorted.next);
 673         g_free(level);
 674 }
 675
 676 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GIS_TYPE_VIEWER);
 677 static void gis_opengl_init(GisOpenGL *opengl)
 678 {
 679         g_debug("GisOpenGL: init");
 680         /* OpenGL setup */
 681         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 682                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 683                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 684         if (!glconfig)
 685                 g_error("Failed to create glconfig");
 686         if (!gtk_widget_set_gl_capability(GTK_WIDGET(opengl),
 687                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 688                 g_error("GL lacks required capabilities");
 689         g_object_unref(glconfig);
 690
 691         opengl->objects = g_tree_new_full(_objects_cmp, NULL, NULL, _objects_free);
 692         opengl->objects_lock = g_mutex_new();
 693         opengl->sphere = roam_sphere_new(opengl);
 694         opengl->sphere_lock = g_mutex_new();
 695
 696 #ifndef ROAM_DEBUG
 697         opengl->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33,  (GSourceFunc)on_idle, opengl, NULL);
 698         opengl->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, opengl, NULL);
 699 #endif
 700
 701         gtk_widget_add_events(GTK_WIDGET(opengl), GDK_KEY_PRESS_MASK);
 702         g_signal_connect(opengl, "realize",          G_CALLBACK(on_realize),      NULL);
 703         g_signal_connect(opengl, "configure-event",  G_CALLBACK(on_configure),    NULL);
 704         g_signal_connect(opengl, "expose-event",     G_CALLBACK(on_expose),       NULL);
 705
 706         g_signal_connect(opengl, "key-press-event",  G_CALLBACK(on_key_press),    NULL);
 707
 708         g_signal_connect(opengl, "location-changed", G_CALLBACK(on_view_changed), NULL);
 709         g_signal_connect(opengl, "rotation-changed", G_CALLBACK(on_view_changed), NULL);
 710 }
 711 static void gis_opengl_dispose(GObject *_opengl)
 712 {
 713         g_debug("GisOpenGL: dispose");
 714         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 715         if (opengl->sm_source[0]) {
 716                 g_source_remove(opengl->sm_source[0]);
 717                 opengl->sm_source[0] = 0;
 718         }
 719         if (opengl->sm_source[1]) {
 720                 g_source_remove(opengl->sm_source[1]);
 721                 opengl->sm_source[1] = 0;
 722         }
 723         if (opengl->ue_source) {
 724                 g_source_remove(opengl->ue_source);
 725                 opengl->ue_source = 0;
 726         }
 727         G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_opengl);
 728 }
 729 static void gis_opengl_finalize(GObject *_opengl)
 730 {
 731         g_debug("GisOpenGL: finalize");
 732         GisOpenGL *opengl = GIS_OPENGL(_opengl);
 733         roam_sphere_free(opengl->sphere);
 734         g_tree_destroy(opengl->objects);
 735         g_mutex_free(opengl->objects_lock);
 736         g_mutex_free(opengl->sphere_lock);
 737         G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_opengl);
 738 }
 739 static void gis_opengl_class_init(GisOpenGLClass *klass)
 740 {
 741         g_debug("GisOpenGL: class_init");
 742         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 743         gobject_class->finalize = gis_opengl_finalize;
 744         gobject_class->dispose = gis_opengl_dispose;
 745
 746         GisViewerClass *viewer_class = GIS_VIEWER_CLASS(klass);
 747         viewer_class->center_position   = gis_opengl_center_position;
 748         viewer_class->project           = gis_opengl_project;
 749         viewer_class->clear_height_func = gis_opengl_clear_height_func;
 750         viewer_class->set_height_func   = gis_opengl_set_height_func;
 751         viewer_class->add               = gis_opengl_add;
 752         viewer_class->remove            = gis_opengl_remove;
 753 }