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 *self;
  32         GisTile      *tile;
  33         GdkPixbuf    *pixbuf;
  34 };
  35 static gboolean _load_tile_cb(gpointer _data)
  36 {
  37         struct _LoadTileData *data = _data;
  38         GisPluginSat *self   = data->self;
  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         gis_viewer_begin(self->viewer);
  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, width, height, 0,
  58                         (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
  59         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  60         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  61         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
  62         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
  63         glFlush();
  64         gis_viewer_end(self->viewer);
  65
  66         tile->data = tex;
  67         gtk_widget_queue_draw(GTK_WIDGET(self->viewer));
  68         g_object_unref(pixbuf);
  69         return FALSE;
  70 }
  71
  72 static void _load_tile(GisTile *tile, gpointer _self)
  73 {
  74         GisPluginSat *self = _self;
  75         g_debug("GisPluginSat: _load_tile start %p", g_thread_self());
  76         char *path = gis_wms_make_local(self->wms, tile);
  77         struct _LoadTileData *data = g_new0(struct _LoadTileData, 1);
  78         data->self   = self;
  79         data->tile   = tile;
  80         data->pixbuf = gdk_pixbuf_new_from_file(path, NULL);
  81         if (data->pixbuf) {
  82                 g_idle_add_full(G_PRIORITY_LOW, _load_tile_cb, data, NULL);
  83         } else {
  84                 g_warning("GisPluginSat: _load_tile - Error loading pixbuf %s", path);
  85                 g_free(data);
  86                 g_remove(path);
  87         }
  88         g_free(path);
  89         g_debug("GisPluginSat: _load_tile end %p", g_thread_self());
  90 }
  91
  92 static gboolean _free_tile_cb(gpointer data)
  93 {
  94         glDeleteTextures(1, data);
  95         g_free(data);
  96         return FALSE;
  97 }
  98 static void _free_tile(GisTile *tile, gpointer _self)
  99 {
 100         GisPluginSat *self = _self;
 101         g_debug("GisPluginSat: _free_tile: %p=%d", tile->data, *(guint*)tile->data);
 102         g_idle_add_full(G_PRIORITY_LOW, _free_tile_cb, tile->data, NULL);
 103 }
 104
 105 static gpointer _update_tiles(gpointer _self)
 106 {
 107         g_debug("GisPluginSat: _update_tiles");
 108         GisPluginSat *self = _self;
 109         g_mutex_lock(self->mutex);
 110         gdouble lat, lon, elev;
 111         gis_viewer_get_location(self->viewer, &lat, &lon, &elev);
 112         gis_tile_update(self->tiles,
 113                         MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
 114                         lat, lon, elev,
 115                         _load_tile, self);
 116         gis_tile_gc(self->tiles, time(NULL)-10,
 117                         _free_tile, self);
 118         g_mutex_unlock(self->mutex);
 119         return NULL;
 120 }
 121
 122 /*************
 123  * Callbacks *
 124  *************/
 125 static void _on_location_changed(GisViewer *viewer,
 126                 gdouble lat, gdouble lon, gdouble elev, GisPluginSat *self)
 127 {
 128         g_thread_create(_update_tiles, self, FALSE, NULL);
 129 }
 130
 131 static gpointer _expose(GisCallback *callback, gpointer _self)
 132 {
 133         GisPluginSat *self = GIS_PLUGIN_SAT(_self);
 134         g_debug("GisPluginSat: expose viewer=%p tiles=%p,%p",
 135                         self->viewer, self->tiles, self->tiles->data);
 136         gis_viewer_render_tiles(self->viewer, self->tiles);
 137         return NULL;
 138 }
 139
 140 /***********
 141  * Methods *
 142  ***********/
 143 GisPluginSat *gis_plugin_sat_new(GisViewer *viewer)
 144 {
 145         g_debug("GisPluginSat: new");
 146         GisPluginSat *self = g_object_new(GIS_TYPE_PLUGIN_SAT, NULL);
 147         self->viewer = g_object_ref(viewer);
 148
 149         /* Load initial tiles */
 150         _load_tile(self->tiles, self);
 151         g_thread_create(_update_tiles, self, FALSE, NULL);
 152
 153         /* Connect signals */
 154         self->sigid = g_signal_connect(self->viewer, "location-changed",
 155                         G_CALLBACK(_on_location_changed), self);
 156
 157         /* Add renderers */
 158         GisCallback *callback = gis_callback_new(_expose, self);
 159         gis_viewer_add(viewer, GIS_OBJECT(callback), GIS_LEVEL_WORLD, 0);
 160
 161         return self;
 162 }
 163
 164
 165 /****************
 166  * GObject code *
 167  ****************/
 168 /* Plugin init */
 169 static void gis_plugin_sat_plugin_init(GisPluginInterface *iface);
 170 G_DEFINE_TYPE_WITH_CODE(GisPluginSat, gis_plugin_sat, G_TYPE_OBJECT,
 171                 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
 172                         gis_plugin_sat_plugin_init));
 173 static void gis_plugin_sat_plugin_init(GisPluginInterface *iface)
 174 {
 175         g_debug("GisPluginSat: plugin_init");
 176         /* Add methods to the interface */
 177 }
 178 /* Class/Object init */
 179 static void gis_plugin_sat_init(GisPluginSat *self)
 180 {
 181         g_debug("GisPluginSat: init");
 182         /* Set defaults */
 183         self->mutex = g_mutex_new();
 184         self->tiles = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
 185         self->wms   = gis_wms_new(
 186                 "http://www.nasa.network.com/wms", "bmng200406", "image/jpeg",
 187                 "bmng/", "jpg", TILE_WIDTH, TILE_HEIGHT);
 188 }
 189 static void gis_plugin_sat_dispose(GObject *gobject)
 190 {
 191         g_debug("GisPluginSat: dispose");
 192         GisPluginSat *self = GIS_PLUGIN_SAT(gobject);
 193         /* Drop references */
 194         if (self->viewer) {
 195                 g_signal_handler_disconnect(self->viewer, self->sigid);
 196                 g_object_unref(self->viewer);
 197                 self->viewer = NULL;
 198         }
 199         G_OBJECT_CLASS(gis_plugin_sat_parent_class)->dispose(gobject);
 200 }
 201 static void gis_plugin_sat_finalize(GObject *gobject)
 202 {
 203         g_debug("GisPluginSat: finalize");
 204         GisPluginSat *self = GIS_PLUGIN_SAT(gobject);
 205         /* Free data */
 206         gis_tile_free(self->tiles, _free_tile, self);
 207         gis_wms_free(self->wms);
 208         g_mutex_free(self->mutex);
 209         G_OBJECT_CLASS(gis_plugin_sat_parent_class)->finalize(gobject);
 210
 211 }
 212 static void gis_plugin_sat_class_init(GisPluginSatClass *klass)
 213 {
 214         g_debug("GisPluginSat: class_init");
 215         GObjectClass *gobject_class = (GObjectClass*)klass;
 216         gobject_class->dispose  = gis_plugin_sat_dispose;
 217         gobject_class->finalize = gis_plugin_sat_finalize;
 218 }