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