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