Pileus Git - grits/blob - src/plugins/map.c

   1 /*
   2  * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
   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 "map.h"
  25
  26 #define MAX_RESOLUTION 500
  27 #define TILE_WIDTH     1024
  28 #define TILE_HEIGHT    512
  29
  30 struct _LoadTileData {
  31         GisPluginMap *self;
  32         GisTile       *tile;
  33         GdkPixbuf     *pixbuf;
  34 };
  35 static gboolean _load_tile_cb(gpointer _data)
  36 {
  37         struct _LoadTileData *data = _data;
  38         GisPluginMap *self   = data->self;
  39         GisTile       *tile   = data->tile;
  40         GdkPixbuf     *pixbuf = data->pixbuf;
  41         g_free(data);
  42
  43         /* Create Texture */
  44         g_debug("GisPluginMap: _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         GisPluginMap *self = _self;
  75         g_debug("GisPluginMap: _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("GisPluginMap: _load_tile - Error loading pixbuf %s", path);
  85                 g_remove(path);
  86         }
  87         g_free(path);
  88         g_debug("GisPluginMap: _load_tile end %p", g_thread_self());
  89 }
  90
  91 static gboolean _free_tile_cb(gpointer data)
  92 {
  93         glDeleteTextures(1, data);
  94         g_free(data);
  95         return FALSE;
  96 }
  97 static void _free_tile(GisTile *tile, gpointer _self)
  98 {
  99         GisPluginMap *self = _self;
 100         g_debug("GisPluginMap: _free_tile: %p=%d", tile->data, *(guint*)tile->data);
 101         g_idle_add_full(G_PRIORITY_LOW, _free_tile_cb, tile->data, NULL);
 102 }
 103
 104 static gpointer _update_tiles(gpointer _self)
 105 {
 106         g_debug("GisPluginMap: _update_tiles");
 107         GisPluginMap *self = _self;
 108         g_mutex_lock(self->mutex);
 109         gdouble lat, lon, elev;
 110         gis_viewer_get_location(self->viewer, &lat, &lon, &elev);
 111         gis_tile_update(self->tiles,
 112                         MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
 113                         lat, lon, elev,
 114                         _load_tile, self);
 115         gis_tile_gc(self->tiles, time(NULL)-10,
 116                         _free_tile, self);
 117         g_mutex_unlock(self->mutex);
 118         return NULL;
 119 }
 120
 121 /*************
 122  * Callbacks *
 123  *************/
 124 static void _on_location_changed(GisViewer *viewer,
 125                 gdouble lat, gdouble lon, gdouble elev, GisPluginMap *self)
 126 {
 127         g_thread_create(_update_tiles, self, FALSE, NULL);
 128 }
 129
 130 static gpointer _expose(GisCallback *callback, gpointer _self)
 131 {
 132         GisPluginMap *self = GIS_PLUGIN_MAP(_self);
 133         g_debug("GisPluginMap: expose viewer=%p tiles=%p,%p",
 134                         self->viewer, self->tiles, self->tiles->data);
 135         gis_viewer_render_tiles(self->viewer, self->tiles);
 136         return NULL;
 137 }
 138
 139 /***********
 140  * Methods *
 141  ***********/
 142 GisPluginMap *gis_plugin_map_new(GisViewer *viewer)
 143 {
 144         g_debug("GisPluginMap: new");
 145         GisPluginMap *self = g_object_new(GIS_TYPE_PLUGIN_MAP, NULL);
 146         self->viewer = g_object_ref(viewer);
 147
 148         /* Load initial tiles */
 149         _load_tile(self->tiles, self);
 150         g_thread_create(_update_tiles, self, FALSE, NULL);
 151
 152         /* Connect signals */
 153         self->sigid = g_signal_connect(self->viewer, "location-changed",
 154                         G_CALLBACK(_on_location_changed), self);
 155
 156         /* Add renderers */
 157         GisCallback *callback = gis_callback_new(_expose, self);
 158         gis_viewer_add(viewer, GIS_OBJECT(callback), GIS_LEVEL_WORLD, 0);
 159
 160         return self;
 161 }
 162
 163
 164 /****************
 165  * GObject code *
 166  ****************/
 167 /* Plugin init */
 168 static void gis_plugin_map_plugin_init(GisPluginInterface *iface);
 169 G_DEFINE_TYPE_WITH_CODE(GisPluginMap, gis_plugin_map, G_TYPE_OBJECT,
 170                 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
 171                         gis_plugin_map_plugin_init));
 172 static void gis_plugin_map_plugin_init(GisPluginInterface *iface)
 173 {
 174         g_debug("GisPluginMap: plugin_init");
 175         /* Add methods to the interface */
 176 }
 177 /* Class/Object init */
 178 static void gis_plugin_map_init(GisPluginMap *self)
 179 {
 180         g_debug("GisPluginMap: init");
 181         /* Set defaults */
 182         self->mutex  = g_mutex_new();
 183         self->tiles  = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
 184         self->wms    = gis_wms_new(
 185                 "http://labs.metacarta.com/wms/vmap0", "basic", "image/png",
 186                 "osm/", "png", TILE_WIDTH, TILE_HEIGHT);
 187 }
 188 static void gis_plugin_map_dispose(GObject *gobject)
 189 {
 190         g_debug("GisPluginMap: dispose");
 191         GisPluginMap *self = GIS_PLUGIN_MAP(gobject);
 192         /* Drop references */
 193         if (self->viewer) {
 194                 g_signal_handler_disconnect(self->viewer, self->sigid);
 195                 g_object_unref(self->viewer);
 196                 self->viewer = NULL;
 197         }
 198         G_OBJECT_CLASS(gis_plugin_map_parent_class)->dispose(gobject);
 199 }
 200 static void gis_plugin_map_finalize(GObject *gobject)
 201 {
 202         g_debug("GisPluginMap: finalize");
 203         GisPluginMap *self = GIS_PLUGIN_MAP(gobject);
 204         /* Free data */
 205         gis_tile_free(self->tiles, _free_tile, self);
 206         gis_wms_free(self->wms);
 207         g_mutex_free(self->mutex);
 208         G_OBJECT_CLASS(gis_plugin_map_parent_class)->finalize(gobject);
 209
 210 }
 211 static void gis_plugin_map_class_init(GisPluginMapClass *klass)
 212 {
 213         g_debug("GisPluginMap: class_init");
 214         GObjectClass *gobject_class = (GObjectClass*)klass;
 215         gobject_class->dispose  = gis_plugin_map_dispose;
 216         gobject_class->finalize = gis_plugin_map_finalize;
 217 }