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

   1 /*
   2  * Copyright (C) 2009-2011 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  * #GritsPluginSat 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
  29 #include <grits.h>
  30
  31 #include "sat.h"
  32
  33 #define MAX_RESOLUTION 500
  34 #define TILE_WIDTH     1024
  35 #define TILE_HEIGHT    512
  36
  37 struct _LoadTileData {
  38         GritsPluginSat *sat;
  39         GritsTile      *tile;
  40         guint8         *pixels;
  41         gboolean        alpha;
  42         gint            width;
  43         gint            height;
  44 };
  45 static gboolean _load_tile_cb(gpointer _data)
  46 {
  47         struct _LoadTileData *data = _data;
  48         g_debug("GritsPluginSat: _load_tile_cb start");
  49         if (data->sat->aborted) {
  50                 g_debug("GritsPluginSat: _load_tile - aborted");
  51                 return FALSE;
  52         }
  53
  54         guint *tex = g_new0(guint, 1);
  55         glGenTextures(1, tex);
  56         glBindTexture(GL_TEXTURE_2D, *tex);
  57
  58         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  59         glPixelStorei(GL_PACK_ALIGNMENT, 1);
  60         glTexImage2D(GL_TEXTURE_2D, 0, 4, data->width, data->height, 0,
  61                         (data->alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, data->pixels);
  62         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  63         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  64         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  65         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  66         glFlush();
  67
  68         data->tile->data = tex;
  69         gtk_widget_queue_draw(GTK_WIDGET(data->sat->viewer));
  70         g_free(data->pixels);
  71         g_free(data);
  72         return FALSE;
  73 }
  74
  75 static void _load_tile(GritsTile *tile, gpointer _sat)
  76 {
  77         GritsPluginSat *sat = _sat;
  78         g_debug("GritsPluginSat: _load_tile start %p", g_thread_self());
  79         if (sat->aborted) {
  80                 g_debug("GritsPluginSat: _load_tile - aborted");
  81                 return;
  82         }
  83
  84         /* Download tile */
  85         gchar *path = grits_wms_fetch(sat->wms, tile, GRITS_ONCE, NULL, NULL);
  86         if (!path) return; // Canceled/error
  87
  88         /* Load pixbuf */
  89         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(path, NULL);
  90         if (!pixbuf) {
  91                 g_warning("GritsPluginSat: _load_tile - Error loading pixbuf %s", path);
  92                 g_remove(path);
  93                 g_free(path);
  94                 return;
  95         }
  96         g_free(path);
  97
  98         /* Copy pixbuf data for callback */
  99         struct _LoadTileData *data = g_new0(struct _LoadTileData, 1);
 100         data->sat    = sat;
 101         data->tile   = tile;
 102         data->pixels = gdk_pixbuf_get_pixels(pixbuf);
 103         data->alpha  = gdk_pixbuf_get_has_alpha(pixbuf);
 104         data->width  = gdk_pixbuf_get_width(pixbuf);
 105         data->height = gdk_pixbuf_get_height(pixbuf);
 106         data->pixels = g_memdup(data->pixels,
 107                         data->width * data->height * (data->alpha ? 4 : 3));
 108         g_object_unref(pixbuf);
 109
 110         /* Draw a border */
 111         //gint border = 10;
 112         //gint stride = gdk_pixbuf_get_rowstride(pixbuf);
 113         //for (int i = 0; i < border; i++) {
 114         //      memset(&pixels[(       i)*stride], 0xff, stride);
 115         //      memset(&pixels[(height-i)*stride], 0xff, stride);
 116         //}
 117         //for (int i = 0; i < height; i++) {
 118         //      memset(&pixels[(i*stride)], 0xff, border*4);
 119         //      memset(&pixels[(i*stride)+((width-border)*4)], 0xff, border*4);
 120         //}
 121
 122         /* Load the GL texture from the main thread */
 123         g_idle_add_full(G_PRIORITY_LOW, _load_tile_cb, data, NULL);
 124         g_debug("GritsPluginSat: _load_tile end %p", g_thread_self());
 125 }
 126
 127 static gboolean _free_tile_cb(gpointer data)
 128 {
 129         glDeleteTextures(1, data);
 130         g_free(data);
 131         return FALSE;
 132 }
 133 static void _free_tile(GritsTile *tile, gpointer _sat)
 134 {
 135         g_debug("GritsPluginSat: _free_tile: %p", tile->data);
 136         if (tile->data)
 137                 g_idle_add_full(G_PRIORITY_LOW, _free_tile_cb, tile->data, NULL);
 138 }
 139
 140 static void _update_tiles(gpointer _, gpointer _sat)
 141 {
 142         g_debug("GritsPluginSat: _update_tiles");
 143         GritsPluginSat *sat = _sat;
 144         GritsPoint eye;
 145         grits_viewer_get_location(sat->viewer, &eye.lat, &eye.lon, &eye.elev);
 146         grits_tile_update(sat->tiles, &eye,
 147                         MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
 148                         _load_tile, sat);
 149         grits_tile_gc(sat->tiles, time(NULL)-10,
 150                         _free_tile, sat);
 151 }
 152
 153 /*************
 154  * Callbacks *
 155  *************/
 156 static void _on_location_changed(GritsViewer *viewer,
 157                 gdouble lat, gdouble lon, gdouble elev, GritsPluginSat *sat)
 158 {
 159         g_thread_pool_push(sat->threads, NULL+1, NULL);
 160 }
 161
 162 /***********
 163  * Methods *
 164  ***********/
 165 /**
 166  * grits_plugin_sat_new:
 167  * @viewer: the #GritsViewer to use for drawing
 168  *
 169  * Create a new instance of the satellite plugin.
 170  *
 171  * Returns: the new #GritsPluginSat
 172  */
 173 GritsPluginSat *grits_plugin_sat_new(GritsViewer *viewer)
 174 {
 175         g_debug("GritsPluginSat: new");
 176         GritsPluginSat *sat = g_object_new(GRITS_TYPE_PLUGIN_SAT, NULL);
 177         sat->viewer = g_object_ref(viewer);
 178
 179         /* Load initial tiles */
 180         _update_tiles(NULL, sat);
 181
 182         /* Connect signals */
 183         sat->sigid = g_signal_connect(sat->viewer, "location-changed",
 184                         G_CALLBACK(_on_location_changed), sat);
 185
 186         /* Add renderers */
 187         grits_viewer_add(viewer, GRITS_OBJECT(sat->tiles), GRITS_LEVEL_WORLD, FALSE);
 188
 189         return sat;
 190 }
 191
 192
 193 /****************
 194  * GObject code *
 195  ****************/
 196 /* Plugin init */
 197 static void grits_plugin_sat_plugin_init(GritsPluginInterface *iface);
 198 G_DEFINE_TYPE_WITH_CODE(GritsPluginSat, grits_plugin_sat, G_TYPE_OBJECT,
 199                 G_IMPLEMENT_INTERFACE(GRITS_TYPE_PLUGIN,
 200                         grits_plugin_sat_plugin_init));
 201 static void grits_plugin_sat_plugin_init(GritsPluginInterface *iface)
 202 {
 203         g_debug("GritsPluginSat: plugin_init");
 204         /* Add methods to the interface */
 205 }
 206 /* Class/Object init */
 207 static void grits_plugin_sat_init(GritsPluginSat *sat)
 208 {
 209         g_debug("GritsPluginSat: init");
 210         /* Set defaults */
 211         sat->threads = g_thread_pool_new(_update_tiles, sat, 1, FALSE, NULL);
 212         sat->tiles = grits_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
 213         sat->wms   = grits_wms_new(
 214                 "http://www.nasa.network.com/wms", "bmng200406", "image/jpeg",
 215                 "bmng/", "jpg", TILE_WIDTH, TILE_HEIGHT);
 216         g_object_ref(sat->tiles);
 217 }
 218 static void grits_plugin_sat_dispose(GObject *gobject)
 219 {
 220         g_debug("GritsPluginSat: dispose");
 221         GritsPluginSat *sat = GRITS_PLUGIN_SAT(gobject);
 222         sat->aborted = TRUE;
 223         /* Drop references */
 224         if (sat->viewer) {
 225                 GritsViewer *viewer = sat->viewer;
 226                 sat->viewer = NULL;
 227                 g_signal_handler_disconnect(viewer, sat->sigid);
 228                 grits_viewer_remove(viewer, GRITS_OBJECT(sat->tiles));
 229                 g_object_unref(sat->tiles);
 230                 soup_session_abort(sat->wms->http->soup);
 231                 g_thread_pool_free(sat->threads, TRUE, TRUE);
 232                 while (gtk_events_pending())
 233                         gtk_main_iteration();
 234                 g_object_unref(viewer);
 235         }
 236         G_OBJECT_CLASS(grits_plugin_sat_parent_class)->dispose(gobject);
 237 }
 238 static void grits_plugin_sat_finalize(GObject *gobject)
 239 {
 240         g_debug("GritsPluginSat: finalize");
 241         GritsPluginSat *sat = GRITS_PLUGIN_SAT(gobject);
 242         /* Free data */
 243         grits_wms_free(sat->wms);
 244         grits_tile_free(sat->tiles, _free_tile, sat);
 245         G_OBJECT_CLASS(grits_plugin_sat_parent_class)->finalize(gobject);
 246
 247 }
 248 static void grits_plugin_sat_class_init(GritsPluginSatClass *klass)
 249 {
 250         g_debug("GritsPluginSat: class_init");
 251         GObjectClass *gobject_class = (GObjectClass*)klass;
 252         gobject_class->dispose  = grits_plugin_sat_dispose;
 253         gobject_class->finalize = grits_plugin_sat_finalize;
 254 }