Pileus Git - grits/blob - src/plugins/srtm.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 <gtk/gtkgl.h>
  19 #include <GL/gl.h>
  20
  21 #include <gis.h>
  22
  23 #include "srtm.h"
  24
  25 #define MAX_RESOLUTION 500
  26 #define TILE_WIDTH     1024
  27 #define TILE_HEIGHT    512
  28
  29 struct _TileData {
  30         /* OpenGL has to be first to make gis_opengl_render_tiles happy */
  31         guint      opengl;
  32         guint16   *bil;
  33 };
  34
  35 static gdouble _height_func(gdouble lat, gdouble lon, gpointer _self)
  36 {
  37         GisPluginSrtm *self = _self;
  38         if (!self) return 0;
  39
  40         GisTile *tile = gis_tile_find(self->tiles, lat, lon);
  41         if (!tile) return 0;
  42
  43         struct _TileData *data = tile->data;
  44         if (!data) return 0;
  45
  46         guint16 *bil  = data->bil;
  47         if (!bil)  return 0;
  48
  49         gint w = TILE_WIDTH;
  50         gint h = TILE_HEIGHT;
  51
  52         gdouble ymin  = tile->edge.s;
  53         gdouble ymax  = tile->edge.n;
  54         gdouble xmin  = tile->edge.w;
  55         gdouble xmax  = tile->edge.e;
  56
  57         gdouble xdist = xmax - xmin;
  58         gdouble ydist = ymax - ymin;
  59
  60         gdouble x =    (lon-xmin)/xdist  * w;
  61         gdouble y = (1-(lat-ymin)/ydist) * h;
  62
  63         gdouble x_rem = x - (int)x;
  64         gdouble y_rem = y - (int)y;
  65         guint x_flr = (int)x;
  66         guint y_flr = (int)y;
  67
  68         /* TODO: Fix interpolation at edges:
  69          *   - Pad these at the edges instead of wrapping/truncating
  70          *   - Figure out which pixels to index (is 0,0 edge, center, etc) */
  71         gint16 px00 = bil[MIN((y_flr  ),h-1)*w + MIN((x_flr  ),w-1)];
  72         gint16 px10 = bil[MIN((y_flr  ),h-1)*w + MIN((x_flr+1),w-1)];
  73         gint16 px01 = bil[MIN((y_flr+1),h-1)*w + MIN((x_flr  ),w-1)];
  74         gint16 px11 = bil[MIN((y_flr+1),h-1)*w + MIN((x_flr+1),w-1)];
  75
  76         gdouble elev =
  77                 px00 * (1-x_rem) * (1-y_rem) +
  78                 px10 * (  x_rem) * (1-y_rem) +
  79                 px01 * (1-x_rem) * (  y_rem) +
  80                 px11 * (  x_rem) * (  y_rem);
  81         return elev;
  82 }
  83
  84 /**********************
  85  * Loader and Freeers *
  86  **********************/
  87 #define LOAD_BIL    TRUE
  88 #define LOAD_OPENGL FALSE
  89 struct _LoadTileData {
  90         GisPluginSrtm    *self;
  91         GisTile          *tile;
  92         GdkPixbuf        *pixbuf;
  93         struct _TileData *data;
  94 };
  95 static guint16 *_load_bil(gchar *path)
  96 {
  97         gchar *data;
  98         g_file_get_contents(path, &data, NULL, NULL);
  99         g_debug("GisPluginSrtm: load_bil %p", data);
 100         return (guint16*)data;
 101 }
 102 static GdkPixbuf *_load_pixbuf(guint16 *bil)
 103 {
 104         GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, TILE_WIDTH, TILE_HEIGHT);
 105         guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
 106         gint       stride = gdk_pixbuf_get_rowstride(pixbuf);
 107         gint       nchan  = gdk_pixbuf_get_n_channels(pixbuf);
 108
 109         for (int r = 0; r < TILE_HEIGHT; r++) {
 110                 for (int c = 0; c < TILE_WIDTH; c++) {
 111                         gint16 value = bil[r*TILE_WIDTH + c];
 112                         //guchar color = (float)(MAX(value,0))/8848 * 255;
 113                         guchar color = (float)value/8848 * 255;
 114                         pixels[r*stride + c*nchan + 0] = color;
 115                         pixels[r*stride + c*nchan + 1] = color;
 116                         pixels[r*stride + c*nchan + 2] = color;
 117                         if (nchan == 4)
 118                                 pixels[r*stride + c*nchan + 3] = 128;
 119                 }
 120         }
 121         g_debug("GisPluginSrtm: load_pixbuf %p", pixbuf);
 122         return pixbuf;
 123 }
 124 static guint _load_opengl(GdkPixbuf *pixbuf)
 125 {
 126         /* Load image */
 127         guchar *pixels = gdk_pixbuf_get_pixels(pixbuf);
 128         gint    alpha  = gdk_pixbuf_get_has_alpha(pixbuf);
 129         gint    nchan  = 4; // gdk_pixbuf_get_n_channels(pixbuf);
 130         gint    width  = gdk_pixbuf_get_width(pixbuf);
 131         gint    height = gdk_pixbuf_get_height(pixbuf);
 132
 133         /* Create Texture */
 134         guint opengl;
 135         glGenTextures(1, &opengl);
 136         glBindTexture(GL_TEXTURE_2D, opengl);
 137
 138         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 139         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 140         glTexImage2D(GL_TEXTURE_2D, 0, nchan, width, height, 0,
 141                         (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
 142         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 143         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 144         //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
 145         //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
 146
 147         g_debug("GisPluginSrtm: load_opengl %d", opengl);
 148         return opengl;
 149 }
 150 static gboolean _load_tile_cb(gpointer _load)
 151 {
 152         struct _LoadTileData *load = _load;
 153         GisPluginSrtm    *self   = load->self;
 154         GisTile          *tile   = load->tile;
 155         GdkPixbuf        *pixbuf = load->pixbuf;
 156         struct _TileData *data   = load->data;
 157         g_free(load);
 158
 159         if (LOAD_OPENGL)
 160                 data->opengl = _load_opengl(pixbuf);
 161
 162         /* Do necessasairy processing */
 163         /* TODO: Lock this and move to thread, can remove self from _load then */
 164         if (LOAD_BIL)
 165                 gis_opengl_set_height_func(self->opengl, tile, _height_func, self, TRUE);
 166
 167         /* Cleanup unneeded things */
 168         if (!LOAD_BIL)
 169                 g_free(data->bil);
 170         if (LOAD_OPENGL)
 171                 g_object_unref(pixbuf);
 172
 173         tile->data = data;
 174         return FALSE;
 175 }
 176 static void _load_tile(GisTile *tile, gpointer _self)
 177 {
 178         GisPluginSrtm *self = _self;
 179
 180         g_debug("GisPluginSrtm: _load_tile");
 181         gchar *path = gis_wms_make_local(self->wms, tile);
 182         struct _LoadTileData *load = g_new0(struct _LoadTileData, 1);
 183         load->self = self;
 184         load->tile = tile;
 185         load->data = g_new0(struct _TileData, 1);
 186         if (LOAD_BIL || LOAD_OPENGL)
 187                 load->data->bil = _load_bil(path);
 188         if (LOAD_OPENGL)
 189                 load->pixbuf = _load_pixbuf(load->data->bil);
 190
 191         g_idle_add_full(G_PRIORITY_LOW, _load_tile_cb, load, NULL);
 192         g_free(path);
 193 }
 194
 195 static gboolean _free_tile_cb(gpointer _data)
 196 {
 197         struct _TileData *data = _data;
 198         if (LOAD_BIL)
 199                 g_free(data->bil);
 200         if (LOAD_OPENGL)
 201                 glDeleteTextures(1, &data->opengl);
 202         g_free(data);
 203         return FALSE;
 204 }
 205 static void _free_tile(GisTile *tile, gpointer _self)
 206 {
 207         GisPluginSrtm *self = _self;
 208         g_debug("GisPluginSrtm: _free_tile: %p=%d", tile->data, *(guint*)tile->data);
 209         g_idle_add_full(G_PRIORITY_LOW, _free_tile_cb, tile->data, NULL);
 210 }
 211
 212 static gpointer _update_tiles(gpointer _self)
 213 {
 214         GisPluginSrtm *self = _self;
 215         g_mutex_lock(self->mutex);
 216         gdouble lat, lon, elev;
 217         gis_view_get_location(self->view, &lat, &lon, &elev);
 218         gis_tile_update(self->tiles,
 219                         MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
 220                         lat, lon, elev,
 221                         _load_tile, self);
 222         gis_tile_gc(self->tiles, time(NULL)-10,
 223                         _free_tile, self);
 224         g_mutex_unlock(self->mutex);
 225         return NULL;
 226 }
 227
 228 /*************
 229  * Callbacks *
 230  *************/
 231 static void _on_location_changed(GisView *view, gdouble lat, gdouble lon, gdouble elev,
 232                 GisPluginSrtm *self)
 233 {
 234         g_thread_create(_update_tiles, self, FALSE, NULL);
 235 }
 236
 237 /***********
 238  * Methods *
 239  ***********/
 240 GisPluginSrtm *gis_plugin_srtm_new(GisWorld *world, GisView *view, GisOpenGL *opengl)
 241 {
 242         g_debug("GisPluginSrtm: new");
 243         GisPluginSrtm *self = g_object_new(GIS_TYPE_PLUGIN_SRTM, NULL);
 244         self->view   = view;
 245         self->opengl = opengl;
 246
 247         /* Load initial tiles */
 248         _load_tile(self->tiles, self);
 249         g_thread_create(_update_tiles, self, FALSE, NULL);
 250
 251         /* Connect signals */
 252         self->sigid = g_signal_connect(self->view, "location-changed",
 253                         G_CALLBACK(_on_location_changed), self);
 254
 255         return self;
 256 }
 257
 258 static void gis_plugin_srtm_expose(GisPlugin *_self)
 259 {
 260         GisPluginSrtm *self = GIS_PLUGIN_SRTM(_self);
 261         g_debug("GisPluginSrtm: expose tiles=%p data=%p",
 262                 self->tiles, self->tiles->data);
 263         if (LOAD_OPENGL)
 264                 gis_opengl_render_tiles(self->opengl, self->tiles);
 265 }
 266
 267
 268 /****************
 269  * GObject code *
 270  ****************/
 271 /* Plugin init */
 272 static void gis_plugin_srtm_plugin_init(GisPluginInterface *iface);
 273 G_DEFINE_TYPE_WITH_CODE(GisPluginSrtm, gis_plugin_srtm, G_TYPE_OBJECT,
 274                 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
 275                         gis_plugin_srtm_plugin_init));
 276 static void gis_plugin_srtm_plugin_init(GisPluginInterface *iface)
 277 {
 278         g_debug("GisPluginSrtm: plugin_init");
 279         /* Add methods to the interface */
 280         iface->expose = gis_plugin_srtm_expose;
 281 }
 282 /* Class/Object init */
 283 static void gis_plugin_srtm_init(GisPluginSrtm *self)
 284 {
 285         g_debug("GisPluginSrtm: init");
 286         /* Set defaults */
 287         self->mutex = g_mutex_new();
 288         self->tiles = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
 289         self->wms   = gis_wms_new(
 290                 "http://www.nasa.network.com/elev", "srtm30", "application/bil",
 291                 "srtm/", "bil", TILE_WIDTH, TILE_HEIGHT);
 292 }
 293 static void gis_plugin_srtm_dispose(GObject *gobject)
 294 {
 295         g_debug("GisPluginSrtm: dispose");
 296         GisPluginSrtm *self = GIS_PLUGIN_SRTM(gobject);
 297         /* Drop references */
 298         g_signal_handler_disconnect(self->view, self->sigid);
 299         if (LOAD_BIL)
 300                 gis_opengl_clear_height_func(self->opengl);
 301         G_OBJECT_CLASS(gis_plugin_srtm_parent_class)->dispose(gobject);
 302 }
 303 static void gis_plugin_srtm_finalize(GObject *gobject)
 304 {
 305         g_debug("GisPluginSrtm: finalize");
 306         GisPluginSrtm *self = GIS_PLUGIN_SRTM(gobject);
 307         /* Free data */
 308         gis_tile_free(self->tiles, _free_tile, self);
 309         gis_wms_free(self->wms);
 310         g_mutex_free(self->mutex);
 311         G_OBJECT_CLASS(gis_plugin_srtm_parent_class)->finalize(gobject);
 312
 313 }
 314 static void gis_plugin_srtm_class_init(GisPluginSrtmClass *klass)
 315 {
 316         g_debug("GisPluginSrtm: class_init");
 317         GObjectClass *gobject_class = (GObjectClass*)klass;
 318         gobject_class->dispose  = gis_plugin_srtm_dispose;
 319         gobject_class->finalize = gis_plugin_srtm_finalize;
 320 }