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