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