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_view_get_location(self->view, &lat, &lon, &elev);
50 gis_view_get_rotation(self->view, &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);
90 glDisable(GL_ALPHA_TEST);
92 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
97 glEnable(GL_CULL_FACE);
101 glDepthFunc(GL_LEQUAL);
102 glEnable(GL_DEPTH_TEST);
104 glEnable(GL_LINE_SMOOTH);
106 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
107 //glShadeModel(GL_FLAT);
114 static void on_realize(GisOpenGL *self, gpointer _)
116 g_debug("GisOpenGL: on_realize");
118 roam_sphere_update_errors(self->sphere);
120 static gboolean on_configure(GisOpenGL *self, GdkEventConfigure *event, gpointer _)
122 g_debug("GisOpenGL: on_configure");
123 gis_opengl_begin(self);
125 double width = GTK_WIDGET(self)->allocation.width;
126 double height = GTK_WIDGET(self)->allocation.height;
127 glViewport(0, 0, width, height);
129 glMatrixMode(GL_PROJECTION);
131 double ang = atan(height/FOV_DIST);
132 gluPerspective(rad2deg(ang)*2, width/height, 1, 20*EARTH_R);
135 roam_sphere_update_errors(self->sphere);
138 gis_opengl_end(self);
142 static void on_expose_plugin(GisPlugin *plugin, gchar *name, GisOpenGL *self)
145 glMatrixMode(GL_PROJECTION); glPushMatrix();
146 glMatrixMode(GL_MODELVIEW); glPushMatrix();
147 gis_plugin_expose(plugin);
148 glMatrixMode(GL_PROJECTION); glPopMatrix();
149 glMatrixMode(GL_MODELVIEW); glPopMatrix();
151 static gboolean on_expose(GisOpenGL *self, GdkEventExpose *event, gpointer _)
153 g_debug("GisOpenGL: on_expose - begin");
154 gis_opengl_begin(self);
156 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
159 gis_plugins_foreach(self->plugins, G_CALLBACK(on_expose_plugin), self);
161 if (self->wireframe) {
163 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
164 roam_sphere_draw(self->sphere);
168 glColor4f(0.0, 0.0, 9.0, 0.6);
169 glDisable(GL_TEXTURE_2D);
170 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
171 roam_sphere_draw(self->sphere);
173 //roam_sphere_draw_normals(self->sphere);
177 gis_opengl_end(self);
178 gis_opengl_flush(self);
179 g_debug("GisOpenGL: on_expose - end\n");
183 static gboolean on_button_press(GisOpenGL *self, GdkEventButton *event, gpointer _)
185 g_debug("GisOpenGL: on_button_press - Grabbing focus");
186 gtk_widget_grab_focus(GTK_WIDGET(self));
190 static gboolean on_key_press(GisOpenGL *self, GdkEventKey *event, gpointer _)
192 g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
193 event->keyval, event->state, GDK_plus);
195 double lat, lon, elev, pan;
196 gis_view_get_location(self->view, &lat, &lon, &elev);
197 pan = MIN(elev/(EARTH_R/2), 30);
198 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);
217 gtk_widget_queue_draw(GTK_WIDGET(self));
223 static void on_view_changed(GisView *view,
224 gdouble _1, gdouble _2, gdouble _3, GisOpenGL *self)
226 g_debug("GisOpenGL: on_view_changed");
227 gis_opengl_begin(self);
230 roam_sphere_update_errors(self->sphere);
232 gis_opengl_redraw(self);
233 gis_opengl_end(self);
236 static gboolean on_idle(GisOpenGL *self)
238 //g_debug("GisOpenGL: on_idle");
239 gis_opengl_begin(self);
240 if (roam_sphere_split_merge(self->sphere))
241 gis_opengl_redraw(self);
242 gis_opengl_end(self);
250 GisOpenGL *gis_opengl_new(GisWorld *world, GisView *view, GisPlugins *plugins)
252 g_debug("GisOpenGL: new");
253 GisOpenGL *self = g_object_new(GIS_TYPE_OPENGL, NULL);
256 self->plugins = plugins;
260 g_signal_connect(self->view, "location-changed", G_CALLBACK(on_view_changed), self);
261 g_signal_connect(self->view, "rotation-changed", G_CALLBACK(on_view_changed), self);
263 self->sphere = roam_sphere_new(self);
265 return g_object_ref(self);
268 void gis_opengl_center_position(GisOpenGL *self, gdouble lat, gdouble lon, gdouble elev)
270 glRotatef(lon, 0, 1, 0);
271 glRotatef(-lat, 1, 0, 0);
272 glTranslatef(0, 0, elev2rad(elev));
275 void gis_opengl_redraw(GisOpenGL *self)
277 g_debug("GisOpenGL: redraw");
278 gtk_widget_queue_draw(GTK_WIDGET(self));
280 void gis_opengl_begin(GisOpenGL *self)
282 g_assert(GIS_IS_OPENGL(self));
284 GdkGLContext *glcontext = gtk_widget_get_gl_context(GTK_WIDGET(self));
285 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
287 if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
288 g_assert_not_reached();
290 void gis_opengl_end(GisOpenGL *self)
292 g_assert(GIS_IS_OPENGL(self));
293 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
294 gdk_gl_drawable_gl_end(gldrawable);
296 void gis_opengl_flush(GisOpenGL *self)
298 g_assert(GIS_IS_OPENGL(self));
299 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
300 if (gdk_gl_drawable_is_double_buffered(gldrawable))
301 gdk_gl_drawable_swap_buffers(gldrawable);
304 gdk_gl_drawable_gl_end(gldrawable);
311 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GTK_TYPE_DRAWING_AREA);
312 static void gis_opengl_init(GisOpenGL *self)
314 g_debug("GisOpenGL: init");
316 GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
317 GDK_GL_MODE_RGBA | GDK_GL_MODE_DEPTH |
318 GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
320 g_error("Failed to create glconfig");
321 if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
322 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
323 g_error("GL lacks required capabilities");
324 g_object_unref(glconfig);
326 gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
327 gtk_widget_set_events(GTK_WIDGET(self),
328 GDK_BUTTON_PRESS_MASK |
329 GDK_ENTER_NOTIFY_MASK |
331 g_object_set(self, "can-focus", TRUE, NULL);
334 self->sm_source = g_timeout_add(10, (GSourceFunc)on_idle, self);
337 g_signal_connect(self, "realize", G_CALLBACK(on_realize), NULL);
338 g_signal_connect(self, "configure-event", G_CALLBACK(on_configure), NULL);
339 g_signal_connect(self, "expose-event", G_CALLBACK(on_expose), NULL);
341 g_signal_connect(self, "button-press-event", G_CALLBACK(on_button_press), NULL);
342 g_signal_connect(self, "enter-notify-event", G_CALLBACK(on_button_press), NULL);
343 g_signal_connect(self, "key-press-event", G_CALLBACK(on_key_press), NULL);
345 static GObject *gis_opengl_constructor(GType gtype, guint n_properties,
346 GObjectConstructParam *properties)
348 g_debug("GisOpengl: constructor");
349 GObjectClass *parent_class = G_OBJECT_CLASS(gis_opengl_parent_class);
350 return parent_class->constructor(gtype, n_properties, properties);
352 static void gis_opengl_dispose(GObject *_self)
354 g_debug("GisOpenGL: dispose");
355 GisOpenGL *self = GIS_OPENGL(_self);
356 if (self->sm_source) {
357 g_source_remove(self->sm_source);
361 roam_sphere_free(self->sphere);
365 g_object_unref(self->world);
369 g_object_unref(self->view);
372 G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
374 static void gis_opengl_finalize(GObject *_self)
376 g_debug("GisOpenGL: finalize");
377 GisOpenGL *self = GIS_OPENGL(_self);
378 G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
380 static void gis_opengl_class_init(GisOpenGLClass *klass)
382 g_debug("GisOpenGL: class_init");
383 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
384 gobject_class->constructor = gis_opengl_constructor;
385 gobject_class->dispose = gis_opengl_dispose;
386 gobject_class->finalize = gis_opengl_finalize;