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 void roam_queue_draw(WmsCacheNode *node, gpointer _self)
44 gtk_widget_queue_draw(GTK_WIDGET(_self));
47 static void set_camera(GisOpenGL *self)
49 glMatrixMode(GL_MODELVIEW);
51 double lat, lon, elev, rx, ry, rz;
52 gis_view_get_location(self->view, &lat, &lon, &elev);
53 gis_view_get_rotation(self->view, &rx, &ry, &rz);
54 glRotatef(rx, 1, 0, 0);
55 glRotatef(rz, 0, 0, 1);
56 glTranslatef(0, 0, -elev2rad(elev));
57 glRotatef(lat, 1, 0, 0);
58 glRotatef(-lon, 0, 1, 0);
61 static void set_visuals(GisOpenGL *self)
64 glMatrixMode(GL_MODELVIEW);
67 float light_ambient[] = {0.7f, 0.7f, 0.7f, 1.0f};
68 float light_diffuse[] = {2.0f, 2.0f, 2.0f, 1.0f};
70 float light_ambient[] = {0.2f, 0.2f, 0.2f, 1.0f};
71 float light_diffuse[] = {5.0f, 5.0f, 5.0f, 1.0f};
73 float light_position[] = {-13*EARTH_R, 1*EARTH_R, 3*EARTH_R, 1.0f};
74 glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
75 glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
76 glLightfv(GL_LIGHT0, GL_POSITION, light_position);
78 glEnable(GL_LIGHTING);
80 float material_ambient[] = {0.2, 0.2, 0.2, 1.0};
81 float material_diffuse[] = {0.8, 0.8, 0.8, 1.0};
82 float material_specular[] = {0.0, 0.0, 0.0, 1.0};
83 float material_emission[] = {0.0, 0.0, 0.0, 1.0};
84 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, material_ambient);
85 glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, material_diffuse);
86 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, material_specular);
87 glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, material_emission);
88 glDisable(GL_TEXTURE_2D);
89 glDisable(GL_COLOR_MATERIAL);
95 gdouble lat, lon, elev;
96 gis_view_get_location(self->view, &lat, &lon, &elev);
97 gdouble rg = MAX(0, 1-(elev/20000));
98 gdouble blue = MAX(0, 1-(elev/50000));
99 glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f);
101 glDisable(GL_ALPHA_TEST);
103 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
108 glEnable(GL_CULL_FACE);
112 glDepthFunc(GL_LEQUAL);
113 glEnable(GL_DEPTH_TEST);
115 glEnable(GL_LINE_SMOOTH);
117 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
118 //glShadeModel(GL_FLAT);
125 static void on_realize(GisOpenGL *self, gpointer _)
127 g_debug("GisOpenGL: on_realize");
129 roam_sphere_update_errors(self->sphere);
131 static gboolean on_configure(GisOpenGL *self, GdkEventConfigure *event, gpointer _)
133 g_debug("GisOpenGL: on_configure");
134 gis_opengl_begin(self);
136 double width = GTK_WIDGET(self)->allocation.width;
137 double height = GTK_WIDGET(self)->allocation.height;
138 glViewport(0, 0, width, height);
140 glMatrixMode(GL_PROJECTION);
142 double ang = atan(height/FOV_DIST);
143 gluPerspective(rad2deg(ang)*2, width/height, 1, 20*EARTH_R);
146 roam_sphere_update_errors(self->sphere);
149 gis_opengl_end(self);
153 static void on_expose_plugin(GisPlugin *plugin, gchar *name, GisOpenGL *self)
156 glMatrixMode(GL_PROJECTION); glPushMatrix();
157 glMatrixMode(GL_MODELVIEW); glPushMatrix();
158 gis_plugin_expose(plugin);
159 glMatrixMode(GL_PROJECTION); glPopMatrix();
160 glMatrixMode(GL_MODELVIEW); glPopMatrix();
162 static gboolean on_expose(GisOpenGL *self, GdkEventExpose *event, gpointer _)
164 g_debug("GisOpenGL: on_expose - begin");
165 gis_opengl_begin(self);
167 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
171 glEnable(GL_TEXTURE_2D);
172 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
173 roam_sphere_draw(self->sphere);
176 glColor4f(0.0, 0.0, 9.0, 0.6);
177 glDisable(GL_TEXTURE_2D);
178 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
179 roam_sphere_draw(self->sphere);
181 //roam_sphere_draw_normals(self->sphere);
184 gis_plugins_foreach(self->plugins, G_CALLBACK(on_expose_plugin), self);
187 gis_opengl_end(self);
188 gis_opengl_flush(self);
189 g_debug("GisOpenGL: on_expose - end\n");
193 static gboolean on_button_press(GisOpenGL *self, GdkEventButton *event, gpointer _)
195 g_debug("GisOpenGL: on_button_press - Grabbing focus");
196 gtk_widget_grab_focus(GTK_WIDGET(self));
200 static gboolean on_key_press(GisOpenGL *self, GdkEventKey *event, gpointer _)
202 g_debug("GisOpenGL: on_key_press - key=%x, state=%x, plus=%x",
203 event->keyval, event->state, GDK_plus);
205 double lat, lon, elev, pan;
206 gis_view_get_location(self->view, &lat, &lon, &elev);
207 pan = MIN(elev/(EARTH_R/2), 30);
208 guint kv = event->keyval;
209 if (kv == GDK_Left || kv == GDK_h) gis_view_pan(self->view, 0, -pan, 0);
210 else if (kv == GDK_Down || kv == GDK_j) gis_view_pan(self->view, -pan, 0, 0);
211 else if (kv == GDK_Up || kv == GDK_k) gis_view_pan(self->view, pan, 0, 0);
212 else if (kv == GDK_Right || kv == GDK_l) gis_view_pan(self->view, 0, pan, 0);
213 else if (kv == GDK_minus || kv == GDK_o) gis_view_zoom(self->view, 10./9);
214 else if (kv == GDK_plus || kv == GDK_i) gis_view_zoom(self->view, 9./10);
215 else if (kv == GDK_H) gis_view_rotate(self->view, 0, 0, -2);
216 else if (kv == GDK_J) gis_view_rotate(self->view, 2, 0, 0);
217 else if (kv == GDK_K) gis_view_rotate(self->view, -2, 0, 0);
218 else if (kv == GDK_L) gis_view_rotate(self->view, 0, 0, 2);
222 else if (kv == GDK_n) roam_sphere_split_one(self->sphere);
223 else if (kv == GDK_p) roam_sphere_merge_one(self->sphere);
224 else if (kv == GDK_r) roam_sphere_split_merge(self->sphere);
225 else if (kv == GDK_u) roam_sphere_update_errors(self->sphere);
226 gtk_widget_queue_draw(GTK_WIDGET(self));
232 static void on_view_changed(GisView *view,
233 gdouble _1, gdouble _2, gdouble _3, GisOpenGL *self)
235 g_debug("GisOpenGL: on_view_changed");
236 gis_opengl_begin(self);
239 roam_sphere_update_errors(self->sphere);
241 gis_opengl_redraw(self);
242 gis_opengl_end(self);
245 static gboolean on_idle(GisOpenGL *self)
247 //g_debug("GisOpenGL: on_idle");
248 gis_opengl_begin(self);
249 if (roam_sphere_split_merge(self->sphere))
250 gis_opengl_redraw(self);
251 gis_opengl_end(self);
259 GisOpenGL *gis_opengl_new(GisWorld *world, GisView *view, GisPlugins *plugins)
261 g_debug("GisOpenGL: new");
262 GisOpenGL *self = g_object_new(GIS_TYPE_OPENGL, NULL);
265 self->plugins = plugins;
269 g_signal_connect(self->view, "location-changed", G_CALLBACK(on_view_changed), self);
270 g_signal_connect(self->view, "rotation-changed", G_CALLBACK(on_view_changed), self);
272 self->sphere = roam_sphere_new(self);
274 return g_object_ref(self);
277 void gis_opengl_center_position(GisOpenGL *self, gdouble lat, gdouble lon, gdouble elev)
279 glRotatef(lon, 0, 1, 0);
280 glRotatef(-lat, 1, 0, 0);
281 glTranslatef(0, 0, elev2rad(elev));
284 void gis_opengl_redraw(GisOpenGL *self)
286 g_debug("GisOpenGL: redraw");
287 gtk_widget_queue_draw(GTK_WIDGET(self));
289 void gis_opengl_begin(GisOpenGL *self)
291 g_assert(GIS_IS_OPENGL(self));
293 GdkGLContext *glcontext = gtk_widget_get_gl_context(GTK_WIDGET(self));
294 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
296 if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
297 g_assert_not_reached();
299 void gis_opengl_end(GisOpenGL *self)
301 g_assert(GIS_IS_OPENGL(self));
302 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
303 gdk_gl_drawable_gl_end(gldrawable);
305 void gis_opengl_flush(GisOpenGL *self)
307 g_assert(GIS_IS_OPENGL(self));
308 GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(self));
309 if (gdk_gl_drawable_is_double_buffered(gldrawable))
310 gdk_gl_drawable_swap_buffers(gldrawable);
313 gdk_gl_drawable_gl_end(gldrawable);
320 G_DEFINE_TYPE(GisOpenGL, gis_opengl, GTK_TYPE_DRAWING_AREA);
321 static void gis_opengl_init(GisOpenGL *self)
323 g_debug("GisOpenGL: init");
325 GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
326 GDK_GL_MODE_RGBA | GDK_GL_MODE_DEPTH |
327 GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
329 g_error("Failed to create glconfig");
330 if (!gtk_widget_set_gl_capability(GTK_WIDGET(self),
331 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
332 g_error("GL lacks required capabilities");
333 g_object_unref(glconfig);
335 gtk_widget_set_size_request(GTK_WIDGET(self), 600, 550);
336 gtk_widget_set_events(GTK_WIDGET(self),
337 GDK_BUTTON_PRESS_MASK |
338 GDK_ENTER_NOTIFY_MASK |
340 g_object_set(self, "can-focus", TRUE, NULL);
343 self->sm_source = g_timeout_add(10, (GSourceFunc)on_idle, self);
346 g_signal_connect(self, "realize", G_CALLBACK(on_realize), NULL);
347 g_signal_connect(self, "configure-event", G_CALLBACK(on_configure), NULL);
348 g_signal_connect(self, "expose-event", G_CALLBACK(on_expose), NULL);
350 g_signal_connect(self, "button-press-event", G_CALLBACK(on_button_press), NULL);
351 g_signal_connect(self, "enter-notify-event", G_CALLBACK(on_button_press), NULL);
352 g_signal_connect(self, "key-press-event", G_CALLBACK(on_key_press), NULL);
354 static GObject *gis_opengl_constructor(GType gtype, guint n_properties,
355 GObjectConstructParam *properties)
357 g_debug("GisOpengl: constructor");
358 GObjectClass *parent_class = G_OBJECT_CLASS(gis_opengl_parent_class);
359 return parent_class->constructor(gtype, n_properties, properties);
361 static void gis_opengl_dispose(GObject *_self)
363 g_debug("GisOpenGL: dispose");
364 GisOpenGL *self = GIS_OPENGL(_self);
365 if (self->sm_source) {
366 g_source_remove(self->sm_source);
370 roam_sphere_free(self->sphere);
374 g_object_unref(self->world);
378 g_object_unref(self->view);
381 G_OBJECT_CLASS(gis_opengl_parent_class)->dispose(_self);
383 static void gis_opengl_finalize(GObject *_self)
385 g_debug("GisOpenGL: finalize");
386 GisOpenGL *self = GIS_OPENGL(_self);
387 G_OBJECT_CLASS(gis_opengl_parent_class)->finalize(_self);
389 static void gis_opengl_class_init(GisOpenGLClass *klass)
391 g_debug("GisOpenGL: class_init");
392 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
393 gobject_class->constructor = gis_opengl_constructor;
394 gobject_class->dispose = gis_opengl_dispose;
395 gobject_class->finalize = gis_opengl_finalize;