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"
33 #define FOV_DIST 2000.0
34 #define MPPX(dist) (4*dist/FOV_DIST)
41 static void set_visuals(GisOpenGL *self)
43 glMatrixMode(GL_MODELVIEW);
47 double lat, lon, elev, rx, ry, rz;
48 gis_view_get_location(self->view, &lat, &lon, &elev);
49 gis_view_get_rotation(self->view, &rx, &ry, &rz);
50 glRotatef(rx, 1, 0, 0);
51 glRotatef(rz, 0, 0, 1);
55 float light_ambient[] = {0.7f, 0.7f, 0.7f, 1.0f};
56 float light_diffuse[] = {2.0f, 2.0f, 2.0f, 1.0f};
58 float light_ambient[] = {0.2f, 0.2f, 0.2f, 1.0f};
59 float light_diffuse[] = {5.0f, 5.0f, 5.0f, 1.0f};
61 float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
62 glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
63 glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
64 glLightfv(GL_LIGHT0, GL_POSITION, light_position);
66 glEnable(GL_LIGHTING);
68 float material_ambient[] = {0.2, 0.2, 0.2, 1.0};
69 float material_diffuse[] = {0.8, 0.8, 0.8, 1.0};
70 float material_specular[] = {0.0, 0.0, 0.0, 1.0};
71 float material_emission[] = {0.0, 0.0, 0.0, 1.0};
72 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, material_ambient);
73 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, material_diffuse);
74 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
75 glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
76 glDisable(GL_TEXTURE_2D);
77 glDisable(GL_COLOR_MATERIAL);
80 glTranslatef(0, 0, -elev2rad(elev));
81 glRotatef(lat, 1, 0, 0);
82 glRotatef(-lon, 0, 1, 0);
85 gdouble rg = MAX(0, 1-(elev/20000));
86 gdouble blue = MAX(0, 1-(elev/50000));
87 glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f);
89 glDisable(GL_ALPHA_TEST);
91 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
96 glEnable(GL_CULL_FACE);
100 glDepthFunc(GL_LEQUAL);
101 glEnable(GL_DEPTH_TEST);
103 glEnable(GL_LINE_SMOOTH);
105 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
106 //glShadeModel(GL_FLAT);
113 static void on_realize(GisOpenGL *self, gpointer _)
115 g_debug("GisOpenGL: on_realize");
117 roam_sphere_update_errors(self->sphere);
119 static gboolean on_configure(GisOpenGL *self, GdkEventConfigure *event, gpointer _)
121 g_debug("GisOpenGL: on_configure");
122 gis_opengl_begin(self);
124 double width = GTK_WIDGET(self)->allocation.width;
125 double height = GTK_WIDGET(self)->allocation.height;
126 glViewport(0, 0, width, height);
128 glMatrixMode(GL_PROJECTION);
130 double ang = atan(height/FOV_DIST);
131 gluPerspective(rad2deg(ang)*2, width/height, 1, 20*EARTH_R);
134 roam_sphere_update_errors(self->sphere);
137 gis_opengl_end(self);
141 static void on_expose_plugin(GisPlugin *plugin, gchar *name, GisOpenGL *self)
144 glMatrixMode(GL_PROJECTION); glPushMatrix();
145 glMatrixMode(GL_MODELVIEW); glPushMatrix();
146 gis_plugin_expose(plugin);
147 glMatrixMode(GL_PROJECTION); glPopMatrix();
148 glMatrixMode(GL_MODELVIEW); glPopMatrix();
150 static gboolean on_expose(GisOpenGL *self, GdkEventExpose *event, gpointer _)
152 g_debug("GisOpenGL: on_expose - begin");
153 gis_opengl_begin(self);
155 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
158 gis_plugins_foreach(self->plugins, G_CALLBACK(on_expose_plugin), self);
160 if (self->wireframe) {
162 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
163 roam_sphere_draw(self->sphere);
167 glColor4f(0.0, 0.0, 9.0, 0.6);
168 glDisable(GL_TEXTURE_2D);
169 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
170 roam_sphere_draw(self->sphere);
172 //roam_sphere_draw_normals(self->sphere);
176 gis_opengl_end(self);
177 gis_opengl_flush(self);
178 g_debug("GisOpenGL: on_expose - end\n");
182 static gboolean on_button_press(GisOpenGL *self, GdkEventButton *event, gpointer _)
184 g_debug("GisOpenGL: on_button_press - Grabbing focus");
185 gtk_widget_grab_focus(GTK_WIDGET(self));
189 static gboolean on_key_press(GisOpenGL *self, GdkEventKey *event, gpointer _)
191 g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
192 event->keyval, event->state, GDK_plus);
194 double lat, lon, elev, pan;
195 gis_view_get_location(self->view, &lat, &lon, &elev);
196 pan = MIN(elev/(EARTH_R/2), 30);
197 guint kv = event->keyval;
199 if (kv == GDK_Left || kv == GDK_h) gis_view_pan(self->view, 0, -pan, 0);
200 else if (kv == GDK_Down || kv == GDK_j) gis_view_pan(self->view, -pan, 0, 0);
201 else if (kv == GDK_Up || kv == GDK_k) gis_view_pan(self->view, pan, 0, 0);
202 else if (kv == GDK_Right || kv == GDK_l) gis_view_pan(self->view, 0, pan, 0);
203 else if (kv == GDK_minus || kv == GDK_o) gis_view_zoom(self->view, 10./9);
204 else if (kv == GDK_plus || kv == GDK_i) gis_view_zoom(self->view, 9./10);
205 else if (kv == GDK_H) gis_view_rotate(self->view, 0, 0, -2);
206 else if (kv == GDK_J) gis_view_rotate(self->view, 2, 0, 0);
207 else if (kv == GDK_K) gis_view_rotate(self->view, -2, 0, 0);
208 else if (kv == GDK_L) gis_view_rotate(self->view, 0, 0, 2);
211 else if (kv == GDK_w) {self->wireframe = !self->wireframe; gtk_widget_queue_draw(GTK_WIDGET(self));}
213 else if (kv == GDK_n) roam_sphere_split_one(self->sphere);
214 else if (kv == GDK_p) roam_sphere_merge_one(self->sphere);
215 else if (kv == GDK_r) roam_sphere_split_merge(self->sphere);
216 else if (kv == GDK_u) roam_sphere_update_errors(self->sphere);
218 gtk_widget_queue_draw(GTK_WIDGET(self));
226 static gboolean _update_errors_cb(gpointer sphere)
228 roam_sphere_update_errors(sphere);
231 static void on_view_changed(GisView *view,
232 gdouble _1, gdouble _2, gdouble _3, GisOpenGL *self)
234 g_debug("GisOpenGL: on_view_changed");
236 gis_opengl_begin(self);
239 g_idle_add_full(G_PRIORITY_HIGH_IDLE+30, _update_errors_cb, self->sphere, NULL);
240 //roam_sphere_update_errors(self->sphere);
242 gis_opengl_redraw(self);
243 gis_opengl_end(self);
247 static gboolean on_idle(GisOpenGL *self)
249 //g_debug("GisOpenGL: on_idle");
251 gis_opengl_begin(self);
252 if (roam_sphere_split_merge(self->sphere))
253 gis_opengl_redraw(self);
254 gis_opengl_end(self);
263 GisOpenGL *gis_opengl_new(GisWorld *world, GisView *view, GisPlugins *plugins)
265 g_debug("GisOpenGL: new");
266 GisOpenGL *self = g_object_new(GIS_TYPE_OPENGL, NULL);
269 self->plugins = plugins;
273 g_signal_connect(self->view, "location-changed", G_CALLBACK(on_view_changed), self);
274 g_signal_connect(self->view, "rotation-changed", G_CALLBACK(on_view_changed), self);
276 self->sphere = roam_sphere_new(self);
278 return g_object_ref(self);
281 void gis_opengl_center_position(GisOpenGL *self, gdouble lat, gdouble lon, gdouble elev)
283 glRotatef(lon, 0, 1, 0);
284 glRotatef(-lat, 1, 0, 0);
285 glTranslatef(0, 0, elev2rad(elev));
288 void gis_opengl_render_tile(GisOpenGL *self, GisTile *tile)
290 if (!tile || !tile->data)
292 GList *triangles = roam_sphere_get_intersect(self->sphere,
293 tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
295 g_warning("GisOpenGL: render_tiles - No triangles to draw: edges=%f,%f,%f,%f",
296 tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
297 //g_message("rendering %4d triangles for tile edges=%7.2f,%7.2f,%7.2f,%7.2f",
298 // g_list_length(triangles), tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
299 for (GList *cur = triangles; cur; cur = cur->next) {
300 RoamTriangle *tri = cur->data;
302 gdouble lat[3] = {tri->p.r->lat, tri->p.m->lat, tri->p.l->lat};
303 gdouble lon[3] = {tri->p.r->lon, tri->p.m->lon, tri->p.l->lon};
305 if (lon[0] < -90 || lon[1] < -90 || lon[2] < -90) {
306 if (lon[0] > 90) lon[0] -= 360;
307 if (lon[1] > 90) lon[1] -= 360;
308 if (lon[2] > 90) lon[2] -= 360;
311 gdouble n = tile->edge.n;
312 gdouble s = tile->edge.s;
313 gdouble e = tile->edge.e;
314 gdouble w = tile->edge.w;
316 gdouble londist = e - w;
317 gdouble latdist = n - s;
320 {(lon[0]-w)/londist, 1-(lat[0]-s)/latdist},
321 {(lon[1]-w)/londist, 1-(lat[1]-s)/latdist},
322 {(lon[2]-w)/londist, 1-(lat[2]-s)/latdist},
325 glEnable(GL_TEXTURE_2D);
326 glBindTexture(GL_TEXTURE_2D, *(guint*)tile->data);
327 glBegin(GL_TRIANGLES);
328 glNormal3dv(tri->p.r->norm); glTexCoord2dv(xy[0]); glVertex3dv((double*)tri->p.r);
329 glNormal3dv(tri->p.m->norm); glTexCoord2dv(xy[1]); glVertex3dv((double*)tri->p.m);
330 glNormal3dv(tri->p.l->norm); glTexCoord2dv(xy[2]); glVertex3dv((double*)tri->p.l);
333 g_list_free(triangles);
336 void gis_opengl_render_tiles(GisOpenGL *opengl, GisTile *tile)
338 /* Only render children if possible */
339 gboolean has_children = TRUE;
341 gis_tile_foreach(tile, child)
342 if (!child || !child->data)
343 has_children = FALSE;
345 /* Only render children */
346 gis_tile_foreach(tile, child)
347 gis_opengl_render_tiles(opengl, child);
349 /* No children, render this tile */
350 gis_opengl_render_tile(opengl, tile);
353 void gis_opengl_set_height_func(GisOpenGL *self, GisTile *tile,
354 RoamHeightFunc height_func, gpointer user_data, gboolean update)
358 /* TODO: get points? */
359 GList *triangles = roam_sphere_get_intersect(self->sphere,
360 tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
361 for (GList *cur = triangles; cur; cur = cur->next) {
362 RoamTriangle *tri = cur->data;
363 RoamPoint *points[] = {tri->p.l, tri->p.m, tri->p.r, tri->split};
364 for (int i = 0; i < G_N_ELEMENTS(points); i++) {
365 points[i]->height_func = height_func;
366 points[i]->height_data = user_data;
367 roam_point_update_height(points[i]);
370 g_list_free(triangles);
373 void gis_opengl_redraw(GisOpenGL *self)
375 g_debug("GisOpenGL: redraw");
376 gtk_widget_queue_draw(GTK_WIDGET(self));
378 void gis_opengl_begin(GisOpenGL *self)
380 g_assert(GIS_IS_OPENGL(self));
382 GdkGLContext *glcontext = gtk_widget_get_gl_context(GTK_WIDGET(self));
383 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
385 if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
386 g_assert_not_reached();
388 void gis_opengl_end(GisOpenGL *self)
390 g_assert(GIS_IS_OPENGL(self));
391 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
392 gdk_gl_drawable_gl_end(gldrawable);
395 void gis_opengl_flush(GisOpenGL *self)
397 g_assert(GIS_IS_OPENGL(self));
398 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
399 if (gdk_gl_drawable_is_double_buffered(gldrawable))
400 gdk_gl_drawable_swap_buffers(gldrawable);
403 gdk_gl_drawable_gl_end(gldrawable);
410 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GTK_TYPE_DRAWING_AREA);
411 static void gis_opengl_init(GisOpenGL *self)
413 g_debug("GisOpenGL: init");
415 GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
416 GDK_GL_MODE_RGBA | GDK_GL_MODE_DEPTH |
417 GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
419 g_error("Failed to create glconfig");
420 if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
421 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
422 g_error("GL lacks required capabilities");
423 g_object_unref(glconfig);
425 gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
426 gtk_widget_set_events(GTK_WIDGET(self),
427 GDK_BUTTON_PRESS_MASK |
428 GDK_ENTER_NOTIFY_MASK |
430 g_object_set(self, "can-focus", TRUE, NULL);
433 self->sm_source = g_timeout_add_full(G_PRIORITY_HIGH_IDLE+30, 33, (GSourceFunc)on_idle, self, NULL);
436 g_signal_connect(self, "realize", G_CALLBACK(on_realize), NULL);
437 g_signal_connect(self, "configure-event", G_CALLBACK(on_configure), NULL);
438 g_signal_connect(self, "expose-event", G_CALLBACK(on_expose), NULL);
440 g_signal_connect(self, "button-press-event", G_CALLBACK(on_button_press), NULL);
441 g_signal_connect(self, "enter-notify-event", G_CALLBACK(on_button_press), NULL);
442 g_signal_connect(self, "key-press-event", G_CALLBACK(on_key_press), NULL);
444 static GObject *gis_opengl_constructor(GType gtype, guint n_properties,
445 GObjectConstructParam *properties)
447 g_debug("GisOpengl: constructor");
448 GObjectClass *parent_class = G_OBJECT_CLASS(gis_opengl_parent_class);
449 return parent_class->constructor(gtype, n_properties, properties);
451 static void gis_opengl_dispose(GObject *_self)
453 g_debug("GisOpenGL: dispose");
454 GisOpenGL *self = GIS_OPENGL(_self);
455 if (self->sm_source) {
456 g_source_remove(self->sm_source);
460 roam_sphere_free(self->sphere);
464 g_object_unref(self->world);
468 g_object_unref(self->view);
471 G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
473 static void gis_opengl_finalize(GObject *_self)
475 g_debug("GisOpenGL: finalize");
476 GisOpenGL *self = GIS_OPENGL(_self);
477 G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
479 static void gis_opengl_class_init(GisOpenGLClass *klass)
481 g_debug("GisOpenGL: class_init");
482 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
483 gobject_class->constructor = gis_opengl_constructor;
484 gobject_class->dispose = gis_opengl_dispose;
485 gobject_class->finalize = gis_opengl_finalize;