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;
198 if (kv == GDK_Left || kv == GDK_h) gis_view_pan(self->view, 0, -pan, 0);
199 else if (kv == GDK_Down || kv == GDK_j) gis_view_pan(self->view, -pan, 0, 0);
200 else if (kv == GDK_Up || kv == GDK_k) gis_view_pan(self->view, pan, 0, 0);
201 else if (kv == GDK_Right || kv == GDK_l) gis_view_pan(self->view, 0, pan, 0);
202 else if (kv == GDK_minus || kv == GDK_o) gis_view_zoom(self->view, 10./9);
203 else if (kv == GDK_plus || kv == GDK_i) gis_view_zoom(self->view, 9./10);
204 else if (kv == GDK_H) gis_view_rotate(self->view, 0, 0, -2);
205 else if (kv == GDK_J) gis_view_rotate(self->view, 2, 0, 0);
206 else if (kv == GDK_K) gis_view_rotate(self->view, -2, 0, 0);
207 else if (kv == GDK_L) gis_view_rotate(self->view, 0, 0, 2);
210 else if (kv == GDK_w) {self->wireframe = !self->wireframe; gtk_widget_queue_draw(GTK_WIDGET(self));}
212 else if (kv == GDK_n) roam_sphere_split_one(self->sphere);
213 else if (kv == GDK_p) roam_sphere_merge_one(self->sphere);
214 else if (kv == GDK_r) roam_sphere_split_merge(self->sphere);
215 else if (kv == GDK_u) roam_sphere_update_errors(self->sphere);
216 gtk_widget_queue_draw(GTK_WIDGET(self));
222 static void on_view_changed(GisView *view,
223 gdouble _1, gdouble _2, gdouble _3, GisOpenGL *self)
225 g_debug("GisOpenGL: on_view_changed");
226 gis_opengl_begin(self);
229 roam_sphere_update_errors(self->sphere);
231 gis_opengl_redraw(self);
232 gis_opengl_end(self);
235 static gboolean on_idle(GisOpenGL *self)
237 //g_debug("GisOpenGL: on_idle");
238 gis_opengl_begin(self);
239 if (roam_sphere_split_merge(self->sphere))
240 gis_opengl_redraw(self);
241 gis_opengl_end(self);
249 GisOpenGL *gis_opengl_new(GisWorld *world, GisView *view, GisPlugins *plugins)
251 g_debug("GisOpenGL: new");
252 GisOpenGL *self = g_object_new(GIS_TYPE_OPENGL, NULL);
255 self->plugins = plugins;
259 g_signal_connect(self->view, "location-changed", G_CALLBACK(on_view_changed), self);
260 g_signal_connect(self->view, "rotation-changed", G_CALLBACK(on_view_changed), self);
262 self->sphere = roam_sphere_new(self);
264 return g_object_ref(self);
267 void gis_opengl_center_position(GisOpenGL *self, gdouble lat, gdouble lon, gdouble elev)
269 glRotatef(lon, 0, 1, 0);
270 glRotatef(-lat, 1, 0, 0);
271 glTranslatef(0, 0, elev2rad(elev));
274 void gis_opengl_redraw(GisOpenGL *self)
276 g_debug("GisOpenGL: redraw");
277 gtk_widget_queue_draw(GTK_WIDGET(self));
279 void gis_opengl_begin(GisOpenGL *self)
281 g_assert(GIS_IS_OPENGL(self));
283 GdkGLContext *glcontext = gtk_widget_get_gl_context(GTK_WIDGET(self));
284 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
286 if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
287 g_assert_not_reached();
289 void gis_opengl_end(GisOpenGL *self)
291 g_assert(GIS_IS_OPENGL(self));
292 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
293 gdk_gl_drawable_gl_end(gldrawable);
295 void gis_opengl_flush(GisOpenGL *self)
297 g_assert(GIS_IS_OPENGL(self));
298 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
299 if (gdk_gl_drawable_is_double_buffered(gldrawable))
300 gdk_gl_drawable_swap_buffers(gldrawable);
303 gdk_gl_drawable_gl_end(gldrawable);
310 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GTK_TYPE_DRAWING_AREA);
311 static void gis_opengl_init(GisOpenGL *self)
313 g_debug("GisOpenGL: init");
315 GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
316 GDK_GL_MODE_RGBA | GDK_GL_MODE_DEPTH |
317 GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
319 g_error("Failed to create glconfig");
320 if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
321 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
322 g_error("GL lacks required capabilities");
323 g_object_unref(glconfig);
325 gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
326 gtk_widget_set_events(GTK_WIDGET(self),
327 GDK_BUTTON_PRESS_MASK |
328 GDK_ENTER_NOTIFY_MASK |
330 g_object_set(self, "can-focus", TRUE, NULL);
333 self->sm_source = g_timeout_add(10, (GSourceFunc)on_idle, self);
336 g_signal_connect(self, "realize", G_CALLBACK(on_realize), NULL);
337 g_signal_connect(self, "configure-event", G_CALLBACK(on_configure), NULL);
338 g_signal_connect(self, "expose-event", G_CALLBACK(on_expose), NULL);
340 g_signal_connect(self, "button-press-event", G_CALLBACK(on_button_press), NULL);
341 g_signal_connect(self, "enter-notify-event", G_CALLBACK(on_button_press), NULL);
342 g_signal_connect(self, "key-press-event", G_CALLBACK(on_key_press), NULL);
344 static GObject *gis_opengl_constructor(GType gtype, guint n_properties,
345 GObjectConstructParam *properties)
347 g_debug("GisOpengl: constructor");
348 GObjectClass *parent_class = G_OBJECT_CLASS(gis_opengl_parent_class);
349 return parent_class->constructor(gtype, n_properties, properties);
351 static void gis_opengl_dispose(GObject *_self)
353 g_debug("GisOpenGL: dispose");
354 GisOpenGL *self = GIS_OPENGL(_self);
355 if (self->sm_source) {
356 g_source_remove(self->sm_source);
360 roam_sphere_free(self->sphere);
364 g_object_unref(self->world);
368 g_object_unref(self->view);
371 G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
373 static void gis_opengl_finalize(GObject *_self)
375 g_debug("GisOpenGL: finalize");
376 GisOpenGL *self = GIS_OPENGL(_self);
377 G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
379 static void gis_opengl_class_init(GisOpenGLClass *klass)
381 g_debug("GisOpenGL: class_init");
382 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
383 gobject_class->constructor = gis_opengl_constructor;
384 gobject_class->dispose = gis_opengl_dispose;
385 gobject_class->finalize = gis_opengl_finalize;