2 * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
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.
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.
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/>.
20 * @short_description: OpenGL based virtual globe
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.
27 * GisOpenGL relies on #GtkGlExt and requires (at least) OpenGL 2.0.
33 #include <gdk/gdkkeysyms.h>
35 #include <gtk/gtkgl.h>
39 #include "gis-opengl.h"
43 #include "objects/gis-object.h"
44 #include "objects/gis-marker.h"
45 #include "objects/gis-callback.h"
49 /* Tessellation, "finding intersecting triangles" */
50 /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
51 /* http://www.opengl.org/wiki/Alpha_Blending */
56 static void _set_visuals(GisOpenGL *opengl)
58 glMatrixMode(GL_MODELVIEW);
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);
70 float light_ambient[] = {0.7f, 0.7f, 0.7f, 1.0f};
71 float light_diffuse[] = {2.0f, 2.0f, 2.0f, 1.0f};
73 float light_ambient[] = {0.2f, 0.2f, 0.2f, 1.0f};
74 float light_diffuse[] = {5.0f, 5.0f, 5.0f, 1.0f};
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);
81 glEnable(GL_LIGHTING);
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);
95 glTranslatef(0, 0, -elev2rad(elev));
96 glRotatef(lat, 1, 0, 0);
97 glRotatef(-lon, 0, 1, 0);
99 glDisable(GL_ALPHA_TEST);
101 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
106 glEnable(GL_CULL_FACE);
110 glDepthFunc(GL_LEQUAL);
111 glEnable(GL_DEPTH_TEST);
113 glEnable(GL_LINE_SMOOTH);
115 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
116 //glShadeModel(GL_FLAT);
118 g_mutex_lock(opengl->sphere_lock);
119 roam_sphere_update_view(opengl->sphere);
120 g_mutex_unlock(opengl->sphere_lock);
124 /********************
126 ********************/
127 static void _draw_tile(GisOpenGL *opengl, GisTile *tile, GList *triangles)
129 if (!tile || !tile->data)
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;
141 gdouble londist = e - w;
142 gdouble latdist = n - s;
144 gdouble xscale = tile->coords.e - tile->coords.w;
145 gdouble yscale = tile->coords.s - tile->coords.n;
147 for (GList *cur = triangles; cur; cur = cur->next) {
148 RoamTriangle *tri = cur->data;
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};
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;
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},
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 "
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 ",
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]);
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;
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;
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);
201 static void _draw_tiles(GisOpenGL *opengl, GisTile *tile)
203 /* Only draw children if possible */
204 gboolean has_children = FALSE;
206 gis_tile_foreach(tile, child)
207 if (child && child->data)
210 GList *triangles = NULL;
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;
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);
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,
231 triangles = g_list_concat(triangles, these);
235 triangles = roam_sphere_get_intersect(opengl->sphere, FALSE,
236 tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
239 _draw_tile(opengl, tile, triangles);
240 g_list_free(triangles);
243 static void _draw_marker(GisOpenGL *opengl, GisMarker *marker)
245 GisPoint *point = gis_object_center(marker);
247 gis_viewer_project(GIS_VIEWER(opengl),
248 point->lat, point->lon, point->elev,
251 gint win_width = GTK_WIDGET(opengl)->allocation.width;
252 gint win_height = GTK_WIDGET(opengl)->allocation.height;
253 py = win_height - py;
257 //g_debug("GisOpenGL: draw_marker - %s pz=%f ", marker->label, pz);
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);
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);
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);
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);
283 static void _draw_callback(GisOpenGL *opengl, GisCallback *callback)
285 callback->callback(callback, callback->user_data);
288 static void _draw_object(GisOpenGL *opengl, GisObject *object)
290 //g_debug("GisOpenGL: draw_object");
291 /* Skip out of range objects */
292 if (object->lod > 0) {
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)
304 /* Horizon testing */
305 gdouble c = EARTH_R+elev;
307 gdouble horizon = sqrt(c*c - a*a);
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);
328 glMatrixMode(GL_PROJECTION); glPopMatrix();
329 glMatrixMode(GL_MODELVIEW); glPopMatrix();
332 static void _load_object(GisOpenGL *opengl, GisObject *object)
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);
341 glEnable(GL_TEXTURE_2D);
342 glGenTextures(1, &marker->tex);
343 glBindTexture(GL_TEXTURE_2D, marker->tex);
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);
355 static void _unload_object(GisOpenGL *opengl, GisObject *object)
357 //g_debug("GisOpenGL: unload_object");
358 if (GIS_IS_MARKER(object)) {
359 GisMarker *marker = GIS_MARKER(object);
360 glDeleteTextures(1, &marker->tex);
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 */
376 static gboolean on_configure(GisOpenGL *opengl, GdkEventConfigure *event, gpointer _)
378 g_debug("GisOpenGL: on_configure");
380 double width = GTK_WIDGET(opengl)->allocation.width;
381 double height = GTK_WIDGET(opengl)->allocation.height;
383 /* Setup OpenGL Window */
384 glViewport(0, 0, width, height);
385 glMatrixMode(GL_PROJECTION);
387 double ang = atan(height/FOV_DIST);
388 gluPerspective(rad2deg(ang)*2, width/height, 1000, 10*EARTH_R);
391 g_mutex_lock(opengl->sphere_lock);
392 roam_sphere_update_errors(opengl->sphere);
393 g_mutex_unlock(opengl->sphere_lock);
399 static void on_realize(GisOpenGL *opengl, gpointer _)
401 g_debug("GisOpenGL: on_realize");
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();
408 _set_visuals(opengl);
409 on_configure(opengl, NULL, NULL);
412 static gboolean _draw_level(gpointer key, gpointer value, gpointer user_data)
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;
420 /* Draw opaque objects without sorting */
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));
426 /* Freeze depth buffer and draw transparent objects sorted */
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));
433 /* TODO: Prune empty levels */
435 g_debug("GisOpenGL: _draw_level - drew %d,%d objects",
440 static gboolean on_expose(GisOpenGL *opengl, GdkEventExpose *event, gpointer _)
442 g_debug("GisOpenGL: on_expose - begin");
444 glClear(GL_COLOR_BUFFER_BIT);
446 _set_visuals(opengl);
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);
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);
464 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(opengl));
465 gdk_gl_drawable_swap_buffers(gldrawable);
467 g_debug("GisOpenGL: on_expose - end\n");
471 static gboolean on_key_press(GisOpenGL *opengl, GdkEventKey *event, gpointer _)
473 g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
474 event->keyval, event->state, GDK_plus);
476 guint kv = event->keyval;
479 opengl->wireframe = !opengl->wireframe;
480 gtk_widget_queue_draw(GTK_WIDGET(opengl));
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));
492 static gboolean _update_errors_cb(gpointer _opengl)
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;
501 static void on_view_changed(GisOpenGL *opengl,
502 gdouble _1, gdouble _2, gdouble _3)
504 g_debug("GisOpenGL: on_view_changed");
505 _set_visuals(opengl);
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);
514 static gboolean on_idle(GisOpenGL *opengl)
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);
525 /*********************
526 * GisViewer methods *
527 *********************/
530 * @plugins: the plugins store to use
531 * @prefs: the preferences object to use
533 * Create a new OpenGL renderer.
535 * Returns: the new #GisOpenGL
537 GisViewer *gis_opengl_new(GisPlugins *plugins, GisPrefs *prefs)
539 g_debug("GisOpenGL: new");
540 GisViewer *opengl = g_object_new(GIS_TYPE_OPENGL, NULL);
541 gis_viewer_setup(opengl, plugins, prefs);
545 static void gis_opengl_center_position(GisViewer *_opengl, gdouble lat, gdouble lon, gdouble elev)
547 GisOpenGL *opengl = GIS_OPENGL(_opengl);
548 glRotatef(lon, 0, 1, 0);
549 glRotatef(-lat, 1, 0, 0);
550 glTranslatef(0, 0, elev2rad(elev));
553 static void gis_opengl_project(GisViewer *_opengl,
554 gdouble lat, gdouble lon, gdouble elev,
555 gdouble *px, gdouble *py, gdouble *pz)
557 GisOpenGL *opengl = GIS_OPENGL(_opengl);
559 lle2xyz(lat, lon, elev, &x, &y, &z);
561 opengl->sphere->view->model,
562 opengl->sphere->view->proj,
563 opengl->sphere->view->view,
567 static void gis_opengl_set_height_func(GisViewer *_opengl, GisTile *tile,
568 RoamHeightFunc height_func, gpointer user_data, gboolean update)
570 GisOpenGL *opengl = GIS_OPENGL(_opengl);
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]);
589 g_list_free(triangles);
590 g_mutex_unlock(opengl->sphere_lock);
593 static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
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]);
603 _gis_opengl_clear_height_func_rec(root->kids[0]);
604 _gis_opengl_clear_height_func_rec(root->kids[1]);
607 static void gis_opengl_clear_height_func(GisViewer *_opengl)
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]);
614 static gpointer gis_opengl_add(GisViewer *_opengl, GisObject *object,
615 gint key, gboolean sort)
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);
623 level = g_new0(struct RenderLevel, 1);
624 g_tree_insert(opengl->objects, (gpointer)key, level);
626 GList *list = sort ? &level->sorted : &level->unsorted;
627 /* Put the link in the list */
628 GList *link = g_new0(GList, 1);
631 link->next = list->next;
633 list->next->prev = link;
635 g_mutex_unlock(opengl->objects_lock);
639 static GisObject *gis_opengl_remove(GisViewer *_opengl, gpointer _link)
641 g_assert(GIS_IS_OPENGL(_opengl));
642 GisOpenGL *opengl = GIS_OPENGL(_opengl);
643 g_mutex_lock(opengl->objects_lock);
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;
650 link->next->prev = link->prev;
652 g_object_unref(object);
653 g_mutex_unlock(opengl->objects_lock);
660 static int _objects_cmp(gconstpointer _a, gconstpointer _b, gpointer _)
662 gint a = (int)_a, b = (int)_b;
666 static void _objects_free(gpointer value)
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);
676 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GIS_TYPE_VIEWER);
677 static void gis_opengl_init(GisOpenGL *opengl)
679 g_debug("GisOpenGL: init");
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);
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);
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();
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);
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);
706 g_signal_connect(opengl, "key-press-event", G_CALLBACK(on_key_press), NULL);
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);
711 static void gis_opengl_dispose(GObject *_opengl)
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;
719 if (opengl->sm_source[1]) {
720 g_source_remove(opengl->sm_source[1]);
721 opengl->sm_source[1] = 0;
723 if (opengl->ue_source) {
724 g_source_remove(opengl->ue_source);
725 opengl->ue_source = 0;
727 G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_opengl);
729 static void gis_opengl_finalize(GObject *_opengl)
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);
739 static void gis_opengl_class_init(GisOpenGLClass *klass)
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;
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;