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