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