2 * Copyright (C) 2009-2011 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 * #GritsPluginEnv 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.
37 static void expose_sky(GritsCallback *sky, GritsOpenGL *opengl, gpointer _env)
39 GritsPluginEnv *env = GRITS_PLUGIN_ENV(_env);
40 g_debug("GritsPluginEnv: expose_sky");
42 gdouble lat, lon, elev;
43 grits_viewer_get_location(env->viewer, &lat, &lon, &elev);
46 gdouble rg = MAX(0, 1-(elev/40000));
47 gdouble blue = MAX(0, 1-(elev/100000));
48 glClearColor(MIN(0.4,rg), MIN(0.4,rg), MIN(1,blue), 1.0f);
49 glClear(GL_COLOR_BUFFER_BIT);
51 /* Attempt to render an atmosphere */
52 glEnable(GL_COLOR_MATERIAL);
53 glDisable(GL_CULL_FACE);
54 glDisable(GL_LIGHTING);
55 glMatrixMode(GL_MODELVIEW);
56 glBlendFunc(GL_SRC_ALPHA, GL_DST_ALPHA);
57 grits_viewer_center_position(env->viewer, lat, lon, -EARTH_R);
59 gdouble ds = EARTH_R+elev; // distance to self
60 gdouble da = EARTH_R+300000; // distance to top of atmosphere
61 gdouble dg = EARTH_R-100000; // distance to top of atmosphere
62 gdouble ang = acos(EARTH_R/ds); // angle to horizon
65 gdouble ar = sin(ang)*da; // top of quad fan "atomosphere"j
66 gdouble az = cos(ang)*da; //
68 gdouble gr = sin(ang)*dg; // bottom of quad fan "ground"
69 gdouble gz = cos(ang)*dg; //
71 glBegin(GL_QUAD_STRIP);
72 for (gdouble i = 0; i <= 2*G_PI; i += G_PI/30) {
73 glColor4f(0.3, 0.3, 1.0, 1.0); glVertex3f(gr*sin(i), gr*cos(i), gz);
74 glColor4f(0.3, 0.3, 1.0, 0.0); glVertex3f(ar*sin(i), ar*cos(i), az);
79 static void expose_hud(GritsCallback *hud, GritsOpenGL *opengl, gpointer _env)
81 GritsPluginEnv *env = GRITS_PLUGIN_ENV(_env);
82 g_debug("GritsPluginEnv: expose_hud");
84 grits_viewer_get_rotation(env->viewer, &x, &y, &z);
86 /* Setup projection */
87 gint win_width = GTK_WIDGET(opengl)->allocation.width;
88 gint win_height = GTK_WIDGET(opengl)->allocation.height;
89 float scale = MIN(win_width, win_height) / 10.0;
90 float offset = scale+20;
91 glTranslatef(offset, offset, 0);
94 float light_ambient[] = {0.1f, 0.1f, 0.0f, 1.0f};
95 float light_diffuse[] = {0.9f, 0.9f, 0.9f, 1.0f};
96 float light_position[] = {-50.0f, -40.0f, -80.0f, 1.0f};
97 glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
98 glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
99 glLightfv(GL_LIGHT0, GL_POSITION, light_position);
102 glClear(GL_DEPTH_BUFFER_BIT);
103 glEnable(GL_COLOR_MATERIAL);
104 glEnable(GL_DEPTH_TEST);
105 glDisable(GL_CULL_FACE);
108 glRotatef(x, 1, 0, 0);
109 glRotatef(-z, 0, 0, 1);
110 glRotatef(-90, 0, 0, 1);
111 glRotatef(-90, 1, 0, 0);
112 glColor4f(0.9, 0.9, 0.7, 1.0);
113 glutSolidTeapot(scale * 0.5);
116 static void click_hud(GritsCallback *hud, GritsViewer *viewer)
118 grits_viewer_set_rotation(viewer, 0, 0, 0);
125 * grits_plugin_env_new:
126 * @viewer: the #GritsViewer to use for drawing
127 * @prefs: the #GritsPrefs for storing configurations
129 * Create a new instance of the environment plugin.
131 * Returns: the new #GritsPluginEnv
133 GritsPluginEnv *grits_plugin_env_new(GritsViewer *viewer, GritsPrefs *prefs)
135 g_debug("GritsPluginEnv: new");
136 GritsPluginEnv *env = g_object_new(GRITS_TYPE_PLUGIN_ENV, NULL);
137 env->viewer = g_object_ref(viewer);
140 GritsCallback *sky = grits_callback_new(expose_sky, env);
141 GritsCallback *hud = grits_callback_new(expose_hud, env);
142 grits_viewer_add(viewer, GRITS_OBJECT(sky), GRITS_LEVEL_BACKGROUND, FALSE);
143 grits_viewer_add(viewer, GRITS_OBJECT(hud), GRITS_LEVEL_HUD, FALSE);
144 g_signal_connect(hud, "clicked", G_CALLBACK(click_hud), viewer);
145 env->refs = g_list_prepend(env->refs, sky);
146 env->refs = g_list_prepend(env->refs, hud);
149 //GritsTile *background = grits_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
150 //glGenTextures(1, &env->tex);
151 //background->data = &env->tex;
152 //grits_viewer_add(viewer, GRITS_OBJECT(background), GRITS_LEVEL_BACKGROUND, FALSE);
153 //env->refs = g_list_prepend(env->refs, background);
163 static void grits_plugin_env_plugin_init(GritsPluginInterface *iface);
164 G_DEFINE_TYPE_WITH_CODE(GritsPluginEnv, grits_plugin_env, G_TYPE_OBJECT,
165 G_IMPLEMENT_INTERFACE(GRITS_TYPE_PLUGIN,
166 grits_plugin_env_plugin_init));
167 static void grits_plugin_env_plugin_init(GritsPluginInterface *iface)
169 g_debug("GritsPluginEnv: plugin_init");
170 /* Add methods to the interface */
172 /* Class/Object init */
173 static void grits_plugin_env_init(GritsPluginEnv *env)
175 g_debug("GritsPluginEnv: init");
178 static void grits_plugin_env_dispose(GObject *gobject)
180 g_debug("GritsPluginEnv: dispose");
181 GritsPluginEnv *env = GRITS_PLUGIN_ENV(gobject);
182 /* Drop references */
184 for (GList *cur = env->refs; cur; cur = cur->next)
185 grits_viewer_remove(env->viewer, cur->data);
186 g_list_free(env->refs);
187 g_object_unref(env->viewer);
188 glDeleteTextures(1, &env->tex);
191 G_OBJECT_CLASS(grits_plugin_env_parent_class)->dispose(gobject);
193 static void grits_plugin_env_class_init(GritsPluginEnvClass *klass)
195 g_debug("GritsPluginEnv: class_init");
196 int argc = 1; char *argv[] = {"", NULL};
197 glutInit(&argc, argv);
198 GObjectClass *gobject_class = (GObjectClass*)klass;
199 gobject_class->dispose = grits_plugin_env_dispose;