Pileus Git - grits/blob - src/plugins/sat.c

   1 /*
   2  * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
   3  *
   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.
   8  *
   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.
  13  *
  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/>.
  16  */
  17
  18 /**
  19  * SECTION:sat
  20  * @short_description: Satellite plugin
  21  *
  22  * #GisPluginSat provides overlays using satellite imagery. This is mostly
  23  * provided by NASA's Blue Marble Next Generation.
  24  */
  25
  26 #include <time.h>
  27 #include <glib/gstdio.h>
  28 #include <GL/gl.h>
  29
  30 #include <gis.h>
  31
  32 #include "sat.h"
  33
  34 #define MAX_RESOLUTION 500
  35 #define TILE_WIDTH     1024
  36 #define TILE_HEIGHT    512
  37
  38 struct _LoadTileData {
  39         GisPluginSat *sat;
  40         GisTile      *tile;
  41         GdkPixbuf    *pixbuf;
  42 };
  43 static gboolean _load_tile_cb(gpointer _data)
  44 {
  45         struct _LoadTileData *data = _data;
  46         GisPluginSat *sat    = data->sat;
  47         GisTile      *tile   = data->tile;
  48         GdkPixbuf    *pixbuf = data->pixbuf;
  49         g_free(data);
  50
  51         /* Create Texture */
  52         g_debug("GisPluginSat: _load_tile_cb start");
  53         guchar   *pixels = gdk_pixbuf_get_pixels(pixbuf);
  54         gboolean  alpha  = gdk_pixbuf_get_has_alpha(pixbuf);
  55         gint      width  = gdk_pixbuf_get_width(pixbuf);
  56         gint      height = gdk_pixbuf_get_height(pixbuf);
  57
  58         guint *tex = g_new0(guint, 1);
  59         glGenTextures(1, tex);
  60         glBindTexture(GL_TEXTURE_2D, *tex);
  61
  62         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  63         glPixelStorei(GL_PACK_ALIGNMENT, 1);
  64         glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
  65                         (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
  66         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  67         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  68         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
  69         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
  70         glFlush();
  71
  72         tile->data = tex;
  73         gtk_widget_queue_draw(GTK_WIDGET(sat->viewer));
  74         g_object_unref(pixbuf);
  75         return FALSE;
  76 }
  77
  78 static void _load_tile(GisTile *tile, gpointer _sat)
  79 {
  80         GisPluginSat *sat = _sat;
  81         g_debug("GisPluginSat: _load_tile start %p", g_thread_self());
  82         char *path = gis_wms_fetch(sat->wms, tile, GIS_ONCE, NULL, NULL);
  83         struct _LoadTileData *data = g_new0(struct _LoadTileData, 1);
  84         data->sat   = sat;
  85         data->tile   = tile;
  86         data->pixbuf = gdk_pixbuf_new_from_file(path, NULL);
  87         if (data->pixbuf) {
  88                 g_idle_add_full(G_PRIORITY_LOW, _load_tile_cb, data, NULL);
  89         } else {
  90                 g_warning("GisPluginSat: _load_tile - Error loading pixbuf %s", path);
  91                 g_free(data);
  92                 g_remove(path);
  93         }
  94         g_free(path);
  95         g_debug("GisPluginSat: _load_tile end %p", g_thread_self());
  96 }
  97
  98 static gboolean _free_tile_cb(gpointer data)
  99 {
 100         glDeleteTextures(1, data);
 101         g_free(data);
 102         return FALSE;
 103 }
 104 static void _free_tile(GisTile *tile, gpointer _sat)
 105 {
 106         GisPluginSat *sat = _sat;
 107         g_debug("GisPluginSat: _free_tile: %p=%d", tile->data, *(guint*)tile->data);
 108         g_idle_add_full(G_PRIORITY_LOW, _free_tile_cb, tile->data, NULL);
 109 }
 110
 111 static gpointer _update_tiles(gpointer _sat)
 112 {
 113         g_debug("GisPluginSat: _update_tiles");
 114         GisPluginSat *sat = _sat;
 115         g_mutex_lock(sat->mutex);
 116         gdouble lat, lon, elev;
 117         gis_viewer_get_location(sat->viewer, &lat, &lon, &elev);
 118         gis_tile_update(sat->tiles,
 119                         MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
 120                         lat, lon, elev,
 121                         _load_tile, sat);
 122         gis_tile_gc(sat->tiles, time(NULL)-10,
 123                         _free_tile, sat);
 124         g_mutex_unlock(sat->mutex);
 125         return NULL;
 126 }
 127
 128 /*************
 129  * Callbacks *
 130  *************/
 131 static void _on_location_changed(GisViewer *viewer,
 132                 gdouble lat, gdouble lon, gdouble elev, GisPluginSat *sat)
 133 {
 134         g_thread_create(_update_tiles, sat, FALSE, NULL);
 135 }
 136
 137 /***********
 138  * Methods *
 139  ***********/
 140 /**
 141  * gis_plugin_sat_new:
 142  * @viewer: the #GisViewer to use for drawing
 143  *
 144  * Create a new instance of the satellite plugin.
 145  *
 146  * Returns: the new #GisPluginSat
 147  */
 148 GisPluginSat *gis_plugin_sat_new(GisViewer *viewer)
 149 {
 150         g_debug("GisPluginSat: new");
 151         GisPluginSat *sat = g_object_new(GIS_TYPE_PLUGIN_SAT, NULL);
 152         sat->viewer = g_object_ref(viewer);
 153
 154         /* Load initial tiles */
 155         _load_tile(sat->tiles, sat);
 156         g_thread_create(_update_tiles, sat, FALSE, NULL);
 157
 158         /* Connect signals */
 159         sat->sigid = g_signal_connect(sat->viewer, "location-changed",
 160                         G_CALLBACK(_on_location_changed), sat);
 161
 162         /* Add renderers */
 163         gis_viewer_add(viewer, GIS_OBJECT(sat->tiles), GIS_LEVEL_WORLD, 0);
 164
 165         return sat;
 166 }
 167
 168
 169 /****************
 170  * GObject code *
 171  ****************/
 172 /* Plugin init */
 173 static void gis_plugin_sat_plugin_init(GisPluginInterface *iface);
 174 G_DEFINE_TYPE_WITH_CODE(GisPluginSat, gis_plugin_sat, G_TYPE_OBJECT,
 175                 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
 176                         gis_plugin_sat_plugin_init));
 177 static void gis_plugin_sat_plugin_init(GisPluginInterface *iface)
 178 {
 179         g_debug("GisPluginSat: plugin_init");
 180         /* Add methods to the interface */
 181 }
 182 /* Class/Object init */
 183 static void gis_plugin_sat_init(GisPluginSat *sat)
 184 {
 185         g_debug("GisPluginSat: init");
 186         /* Set defaults */
 187         sat->mutex = g_mutex_new();
 188         sat->tiles = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
 189         sat->wms   = gis_wms_new(
 190                 "http://www.nasa.network.com/wms", "bmng200406", "image/jpeg",
 191                 "bmng/", "jpg", TILE_WIDTH, TILE_HEIGHT);
 192 }
 193 static void gis_plugin_sat_dispose(GObject *gobject)
 194 {
 195         g_debug("GisPluginSat: dispose");
 196         GisPluginSat *sat = GIS_PLUGIN_SAT(gobject);
 197         /* Drop references */
 198         if (sat->viewer) {
 199                 g_signal_handler_disconnect(sat->viewer, sat->sigid);
 200                 g_object_unref(sat->viewer);
 201                 sat->viewer = NULL;
 202         }
 203         G_OBJECT_CLASS(gis_plugin_sat_parent_class)->dispose(gobject);
 204 }
 205 static void gis_plugin_sat_finalize(GObject *gobject)
 206 {
 207         g_debug("GisPluginSat: finalize");
 208         GisPluginSat *sat = GIS_PLUGIN_SAT(gobject);
 209         /* Free data */
 210         gis_tile_free(sat->tiles, _free_tile, sat);
 211         gis_wms_free(sat->wms);
 212         g_mutex_free(sat->mutex);
 213         G_OBJECT_CLASS(gis_plugin_sat_parent_class)->finalize(gobject);
 214
 215 }
 216 static void gis_plugin_sat_class_init(GisPluginSatClass *klass)
 217 {
 218         g_debug("GisPluginSat: class_init");
 219         GObjectClass *gobject_class = (GObjectClass*)klass;
 220         gobject_class->dispose  = gis_plugin_sat_dispose;
 221         gobject_class->finalize = gis_plugin_sat_finalize;
 222 }