2 * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
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/>.
20 * @short_description: Environment plugin
22 * #GisPluginEnv provides environmental information such as sky images. It can
23 * also paint a blank overlay on the surface so that other plugins can draw
24 * transparent overlays nicely.
28 #include <gtk/gtkgl.h>
38 static void expose(GisCallback *callback, GisOpenGL *opengl, gpointer _env)
40 GisPluginEnv *env = GIS_PLUGIN_ENV(_env);
41 g_debug("GisPluginEnv: expose");
43 gdouble lat, lon, elev;
44 gis_viewer_get_location(env->viewer, &lat, &lon, &elev);
47 gdouble rg = MAX(0, 1-(elev/20000));
48 gdouble blue = MAX(0, 1-(elev/50000));
49 glClearColor(MIN(0.65,rg), MIN(0.65,rg), MIN(1,blue), 1.0f);
50 glClear(GL_COLOR_BUFFER_BIT);
52 /* Attempt to render an atmosphere */
54 glEnable(GL_COLOR_MATERIAL);
55 glDisable(GL_CULL_FACE);
56 glDisable(GL_LIGHTING);
58 glBlendFunc(GL_ONE, GL_ONE);
60 glMatrixMode(GL_MODELVIEW);
63 for (elev = -EARTH_R; elev < 0; elev += EARTH_R/10) {
65 glColor4f(0.3, 0.3, 1.0, 0.2);
66 gis_viewer_center_position(env->viewer, lat, lon, elev);
68 glBegin(GL_TRIANGLE_FAN);
70 for (gdouble i = 0; i <= 2*G_PI; i += G_PI/10) {
71 gint rad = 1*EARTH_R + 300000;
72 glVertex3f(rad*sin(i), rad*cos(i), 0);
73 g_message("%f %f %f", 3*EARTH_R*sin(i), 3*EARTH_R*cos(i), 0.);
87 * @viewer: the #GisViewer to use for drawing
88 * @prefs: the #GisPrefs for storing configurations
90 * Create a new instance of the environment plugin.
92 * Returns: the new #GisPluginEnv
94 GisPluginEnv *gis_plugin_env_new(GisViewer *viewer, GisPrefs *prefs)
96 g_debug("GisPluginEnv: new");
97 GisPluginEnv *env = g_object_new(GIS_TYPE_PLUGIN_ENV, NULL);
98 env->viewer = g_object_ref(viewer);
101 GisCallback *callback = gis_callback_new(expose, env);
102 GisTile *background = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
103 glGenTextures(1, &env->tex);
104 background->data = &env->tex;
108 ref1 = gis_viewer_add(viewer, GIS_OBJECT(callback), GIS_LEVEL_BACKGROUND, FALSE);
109 ref2 = gis_viewer_add(viewer, GIS_OBJECT(background), GIS_LEVEL_BACKGROUND, FALSE);
110 env->refs = g_list_prepend(env->refs, ref1);
111 env->refs = g_list_prepend(env->refs, ref2);
121 static void gis_plugin_env_plugin_init(GisPluginInterface *iface);
122 G_DEFINE_TYPE_WITH_CODE(GisPluginEnv, gis_plugin_env, G_TYPE_OBJECT,
123 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
124 gis_plugin_env_plugin_init));
125 static void gis_plugin_env_plugin_init(GisPluginInterface *iface)
127 g_debug("GisPluginEnv: plugin_init");
128 /* Add methods to the interface */
130 /* Class/Object init */
131 static void gis_plugin_env_init(GisPluginEnv *env)
133 g_debug("GisPluginEnv: init");
136 static void gis_plugin_env_dispose(GObject *gobject)
138 g_debug("GisPluginEnv: dispose");
139 GisPluginEnv *env = GIS_PLUGIN_ENV(gobject);
140 /* Drop references */
142 for (GList *cur = env->refs; cur; cur = cur->next)
143 gis_viewer_remove(env->viewer, cur->data);
144 g_list_free(env->refs);
145 g_object_unref(env->viewer);
146 glDeleteTextures(1, &env->tex);
149 G_OBJECT_CLASS(gis_plugin_env_parent_class)->dispose(gobject);
151 static void gis_plugin_env_class_init(GisPluginEnvClass *klass)
153 g_debug("GisPluginEnv: class_init");
154 GObjectClass *gobject_class = (GObjectClass*)klass;
155 gobject_class->dispose = gis_plugin_env_dispose;