2 * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
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/>.
18 /* Tessellation, "finding intersecting triangles" */
19 /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
20 /* http://www.opengl.org/wiki/Alpha_Blending */
24 #include <gdk/gdkkeysyms.h>
26 #include <gtk/gtkgl.h>
30 #include "gis-opengl.h"
34 #define FOV_DIST 2000.0
35 #define MPPX(dist) (4*dist/FOV_DIST)
42 static void set_visuals(GisOpenGL *self)
44 glMatrixMode(GL_MODELVIEW);
48 double lat, lon, elev, rx, ry, rz;
49 gis_viewer_get_location(self->viewer, &lat, &lon, &elev);
50 gis_viewer_get_rotation(self->viewer, &rx, &ry, &rz);
51 glRotatef(rx, 1, 0, 0);
52 glRotatef(rz, 0, 0, 1);
56 float light_ambient[] = {0.7f, 0.7f, 0.7f, 1.0f};
57 float light_diffuse[] = {2.0f, 2.0f, 2.0f, 1.0f};
59 float light_ambient[] = {0.2f, 0.2f, 0.2f, 1.0f};
60 float light_diffuse[] = {5.0f, 5.0f, 5.0f, 1.0f};
62 float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
63 glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
64 glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
65 glLightfv(GL_LIGHT0, GL_POSITION, light_position);
67 glEnable(GL_LIGHTING);
69 float material_ambient[] = {0.2, 0.2, 0.2, 1.0};
70 float material_diffuse[] = {0.8, 0.8, 0.8, 1.0};
71 float material_specular[] = {0.0, 0.0, 0.0, 1.0};
72 float material_emission[] = {0.0, 0.0, 0.0, 1.0};
73 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, material_ambient);
74 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, material_diffuse);
75 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
76 glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
77 glDisable(GL_TEXTURE_2D);
78 glDisable(GL_COLOR_MATERIAL);
81 glTranslatef(0, 0, -elev2rad(elev));
82 glRotatef(lat, 1, 0, 0);
83 glRotatef(-lon, 0, 1, 0);
86 gdouble rg = MAX(0, 1-(elev/20000));
87 gdouble blue = MAX(0, 1-(elev/50000));
88 glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f);
89 glColor4f(1, 1, 1, 1);
91 glDisable(GL_ALPHA_TEST);
93 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
98 glEnable(GL_CULL_FACE);
102 glDepthFunc(GL_LEQUAL);
103 glEnable(GL_DEPTH_TEST);
105 glEnable(GL_LINE_SMOOTH);
107 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
108 //glShadeModel(GL_FLAT);
110 roam_sphere_update_view(self->sphere);
117 static void on_realize(GisOpenGL *self, gpointer _)
119 g_debug("GisOpenGL: on_realize");
121 roam_sphere_update_errors(self->sphere);
123 static gboolean on_configure(GisOpenGL *self, GdkEventConfigure *event, gpointer _)
125 g_debug("GisOpenGL: on_configure");
126 gis_opengl_begin(self);
128 double width = GTK_WIDGET(self)->allocation.width;
129 double height = GTK_WIDGET(self)->allocation.height;
130 glViewport(0, 0, width, height);
132 glMatrixMode(GL_PROJECTION);
134 double ang = atan(height/FOV_DIST);
135 gluPerspective(rad2deg(ang)*2, width/height, 1, 20*EARTH_R);
138 roam_sphere_update_errors(self->sphere);
141 gis_opengl_end(self);
145 static void on_expose_plugin(GisPlugin *plugin, gchar *name, GisOpenGL *self)
148 glMatrixMode(GL_PROJECTION); glPushMatrix();
149 glMatrixMode(GL_MODELVIEW); glPushMatrix();
150 gis_plugin_expose(plugin);
151 glMatrixMode(GL_PROJECTION); glPopMatrix();
152 glMatrixMode(GL_MODELVIEW); glPopMatrix();
154 static gboolean on_expose(GisOpenGL *self, GdkEventExpose *event, gpointer _)
156 g_debug("GisOpenGL: on_expose - begin");
157 gis_opengl_begin(self);
159 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
162 gis_plugins_foreach(self->plugins, G_CALLBACK(on_expose_plugin), self);
164 if (self->wireframe) {
166 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
167 roam_sphere_draw(self->sphere);
171 glColor4f(0.0, 0.0, 9.0, 0.6);
172 glDisable(GL_TEXTURE_2D);
173 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
174 roam_sphere_draw(self->sphere);
176 //roam_sphere_draw_normals(self->sphere);
180 gis_opengl_end(self);
181 gis_opengl_flush(self);
182 g_debug("GisOpenGL: on_expose - end\n");
186 static gboolean on_button_press(GisOpenGL *self, GdkEventButton *event, gpointer _)
188 g_debug("GisOpenGL: on_button_press - Grabbing focus");
189 gtk_widget_grab_focus(GTK_WIDGET(self));
193 static gboolean on_key_press(GisOpenGL *self, GdkEventKey *event, gpointer _)
195 g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
196 event->keyval, event->state, GDK_plus);
198 double lat, lon, elev, pan;
199 gis_viewer_get_location(self->viewer, &lat, &lon, &elev);
200 pan = MIN(elev/(EARTH_R/2), 30);
201 guint kv = event->keyval;
203 if (kv == GDK_Left || kv == GDK_h) gis_viewer_pan(self->viewer, 0, -pan, 0);
204 else if (kv == GDK_Down || kv == GDK_j) gis_viewer_pan(self->viewer, -pan, 0, 0);
205 else if (kv == GDK_Up || kv == GDK_k) gis_viewer_pan(self->viewer, pan, 0, 0);
206 else if (kv == GDK_Right || kv == GDK_l) gis_viewer_pan(self->viewer, 0, pan, 0);
207 else if (kv == GDK_minus || kv == GDK_o) gis_viewer_zoom(self->viewer, 10./9);
208 else if (kv == GDK_plus || kv == GDK_i) gis_viewer_zoom(self->viewer, 9./10);
209 else if (kv == GDK_H) gis_viewer_rotate(self->viewer, 0, 0, -2);
210 else if (kv == GDK_J) gis_viewer_rotate(self->viewer, 2, 0, 0);
211 else if (kv == GDK_K) gis_viewer_rotate(self->viewer, -2, 0, 0);
212 else if (kv == GDK_L) gis_viewer_rotate(self->viewer, 0, 0, 2);
215 else if (kv == GDK_w) {self->wireframe = !self->wireframe; gtk_widget_queue_draw(GTK_WIDGET(self));}
217 else if (kv == GDK_n) roam_sphere_split_one(self->sphere);
218 else if (kv == GDK_p) roam_sphere_merge_one(self->sphere);
219 else if (kv == GDK_r) roam_sphere_split_merge(self->sphere);
220 else if (kv == GDK_u) roam_sphere_update_errors(self->sphere);
222 gtk_widget_queue_draw(GTK_WIDGET(self));
230 static gboolean _update_errors_cb(gpointer sphere)
232 roam_sphere_update_errors(sphere);
235 static void on_view_changed(GisViewer *viewer,
236 gdouble _1, gdouble _2, gdouble _3, GisOpenGL *self)
238 g_debug("GisOpenGL: on_view_changed");
240 gis_opengl_begin(self);
243 g_idle_add_full(G_PRIORITY_HIGH_IDLE+30, _update_errors_cb, self->sphere, NULL);
244 //roam_sphere_update_errors(self->sphere);
246 gis_opengl_redraw(self);
247 gis_opengl_end(self);
251 static gboolean on_idle(GisOpenGL *self)
253 //g_debug("GisOpenGL: on_idle");
255 gis_opengl_begin(self);
256 if (roam_sphere_split_merge(self->sphere))
257 gis_opengl_redraw(self);
258 gis_opengl_end(self);
267 GisOpenGL *gis_opengl_new(GisViewer *viewer, GisPlugins *plugins)
269 g_debug("GisOpenGL: new");
270 GisOpenGL *self = g_object_new(GIS_TYPE_OPENGL, NULL);
271 self->viewer = viewer;
272 self->plugins = plugins;
273 g_object_ref(viewer);
275 g_signal_connect(self->viewer, "location-changed", G_CALLBACK(on_view_changed), self);
276 g_signal_connect(self->viewer, "rotation-changed", G_CALLBACK(on_view_changed), self);
278 self->sphere = roam_sphere_new(self);
280 return g_object_ref(self);
283 void gis_opengl_center_position(GisOpenGL *self, gdouble lat, gdouble lon, gdouble elev)
285 glRotatef(lon, 0, 1, 0);
286 glRotatef(-lat, 1, 0, 0);
287 glTranslatef(0, 0, elev2rad(elev));
290 void gis_opengl_project(GisOpenGL *self,
291 gdouble lat, gdouble lon, gdouble elev,
292 gdouble *px, gdouble *py, gdouble *pz)
295 lle2xyz(lat, lon, elev, &x, &y, &z);
297 self->sphere->view->model,
298 self->sphere->view->proj,
299 self->sphere->view->view,
303 void gis_opengl_render_tile(GisOpenGL *self, GisTile *tile)
305 if (!tile || !tile->data)
307 GList *triangles = roam_sphere_get_intersect(self->sphere,
308 tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
310 g_warning("GisOpenGL: render_tiles - No triangles to draw: edges=%f,%f,%f,%f",
311 tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
312 //g_message("rendering %4d triangles for tile edges=%7.2f,%7.2f,%7.2f,%7.2f",
313 // g_list_length(triangles), tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
314 for (GList *cur = triangles; cur; cur = cur->next) {
315 RoamTriangle *tri = cur->data;
317 gdouble lat[3] = {tri->p.r->lat, tri->p.m->lat, tri->p.l->lat};
318 gdouble lon[3] = {tri->p.r->lon, tri->p.m->lon, tri->p.l->lon};
320 if (lon[0] < -90 || lon[1] < -90 || lon[2] < -90) {
321 if (lon[0] > 90) lon[0] -= 360;
322 if (lon[1] > 90) lon[1] -= 360;
323 if (lon[2] > 90) lon[2] -= 360;
326 gdouble n = tile->edge.n;
327 gdouble s = tile->edge.s;
328 gdouble e = tile->edge.e;
329 gdouble w = tile->edge.w;
331 gdouble londist = e - w;
332 gdouble latdist = n - s;
335 {(lon[0]-w)/londist, 1-(lat[0]-s)/latdist},
336 {(lon[1]-w)/londist, 1-(lat[1]-s)/latdist},
337 {(lon[2]-w)/londist, 1-(lat[2]-s)/latdist},
340 glEnable(GL_TEXTURE_2D);
341 glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
342 glBegin(GL_TRIANGLES);
343 glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
344 glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
345 glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
348 g_list_free(triangles);
351 void gis_opengl_render_tiles(GisOpenGL *opengl, GisTile *tile)
353 /* Only render children if possible */
354 gboolean has_children = TRUE;
356 gis_tile_foreach(tile, child)
357 if (!child || !child->data)
358 has_children = FALSE;
360 /* Only render children */
361 gis_tile_foreach(tile, child)
362 gis_opengl_render_tiles(opengl, child);
364 /* No children, render this tile */
365 gis_opengl_render_tile(opengl, tile);
368 void gis_opengl_set_height_func(GisOpenGL *self, GisTile *tile,
369 RoamHeightFunc height_func, gpointer user_data, gboolean update)
373 /* TODO: get points? */
374 GList *triangles = roam_sphere_get_intersect(self->sphere,
375 tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
376 for (GList *cur = triangles; cur; cur = cur->next) {
377 RoamTriangle *tri = cur->data;
378 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
379 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
380 points[i]->height_func = height_func;
381 points[i]->height_data = user_data;
382 roam_point_update_height(points[i]);
385 g_list_free(triangles);
388 static void _gis_opengl_clear_height_func_rec(RoamTriangle *root)
392 RoamPoint *points[] = {root->p.l, root->p.m, root->p.r, root->split};
393 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
394 points[i]->height_func = NULL;
395 points[i]->height_data = NULL;
396 roam_point_update_height(points[i]);
398 _gis_opengl_clear_height_func_rec(root->kids[0]);
399 _gis_opengl_clear_height_func_rec(root->kids[1]);
401 void gis_opengl_clear_height_func(GisOpenGL *self)
403 for (int i = 0; i < G_N_ELEMENTS(self->sphere->roots); i++)
404 _gis_opengl_clear_height_func_rec(self->sphere->roots[i]);
407 void gis_opengl_redraw(GisOpenGL *self)
409 g_debug("GisOpenGL: redraw");
410 gtk_widget_queue_draw(GTK_WIDGET(self));
412 void gis_opengl_begin(GisOpenGL *self)
414 g_assert(GIS_IS_OPENGL(self));
416 GdkGLContext *glcontext = gtk_widget_get_gl_context(GTK_WIDGET(self));
417 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
419 if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
420 g_assert_not_reached();
422 void gis_opengl_end(GisOpenGL *self)
424 g_assert(GIS_IS_OPENGL(self));
425 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
426 gdk_gl_drawable_gl_end(gldrawable);
428 void gis_opengl_flush(GisOpenGL *self)
430 g_assert(GIS_IS_OPENGL(self));
431 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
432 if (gdk_gl_drawable_is_double_buffered(gldrawable))
433 gdk_gl_drawable_swap_buffers(gldrawable);
436 gdk_gl_drawable_gl_end(gldrawable);
443 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GTK_TYPE_DRAWING_AREA);
444 static void gis_opengl_init(GisOpenGL *self)
446 g_debug("GisOpenGL: init");
448 GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
449 GDK_GL_MODE_RGBA | GDK_GL_MODE_DEPTH |
450 GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
452 g_error("Failed to create glconfig");
453 if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
454 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
455 g_error("GL lacks required capabilities");
456 g_object_unref(glconfig);
458 gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
459 gtk_widget_set_events(GTK_WIDGET(self),
460 GDK_BUTTON_PRESS_MASK |
461 GDK_ENTER_NOTIFY_MASK |
463 g_object_set(self, "can-focus", TRUE, NULL);
466 self->sm_source[0] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33, (GSourceFunc)on_idle, self, NULL);
467 self->sm_source[1] = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+10, 500, (GSourceFunc)on_idle, self, NULL);
470 g_signal_connect(self, "realize", G_CALLBACK(on_realize), NULL);
471 g_signal_connect(self, "configure-event", G_CALLBACK(on_configure), NULL);
472 g_signal_connect(self, "expose-event", G_CALLBACK(on_expose), NULL);
474 g_signal_connect(self, "button-press-event", G_CALLBACK(on_button_press), NULL);
475 g_signal_connect(self, "enter-notify-event", G_CALLBACK(on_button_press), NULL);
476 g_signal_connect(self, "key-press-event", G_CALLBACK(on_key_press), NULL);
478 static GObject *gis_opengl_constructor(GType gtype, guint n_properties,
479 GObjectConstructParam *properties)
481 g_debug("GisOpengl: constructor");
482 GObjectClass *parent_class = G_OBJECT_CLASS(gis_opengl_parent_class);
483 return parent_class->constructor(gtype, n_properties, properties);
485 static void gis_opengl_dispose(GObject *_self)
487 g_debug("GisOpenGL: dispose");
488 GisOpenGL *self = GIS_OPENGL(_self);
489 if (self->sm_source[0]) {
490 g_source_remove(self->sm_source[0]);
491 self->sm_source[0] = 0;
493 if (self->sm_source[1]) {
494 g_source_remove(self->sm_source[1]);
495 self->sm_source[1] = 0;
498 roam_sphere_free(self->sphere);
502 g_object_unref(self->viewer);
505 G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
507 static void gis_opengl_finalize(GObject *_self)
509 g_debug("GisOpenGL: finalize");
510 GisOpenGL *self = GIS_OPENGL(_self);
511 G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
513 static void gis_opengl_class_init(GisOpenGLClass *klass)
515 g_debug("GisOpenGL: class_init");
516 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
517 gobject_class->constructor = gis_opengl_constructor;
518 gobject_class->dispose = gis_opengl_dispose;
519 gobject_class->finalize = gis_opengl_finalize;