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         gchar            *path;
  92         GisTile          *tile;
  93         GdkPixbuf        *pixbuf;
  94         struct _TileData *data;
  95 };
  96 static guint16 *_load_bil(gchar *path)
  97 {
  98         gchar *data;
  99         g_file_get_contents(path, &data, NULL, NULL);
 100         g_debug("GisPluginSrtm: load_bil %p", data);
 101         return (guint16*)data;
 102 }
 103 static GdkPixbuf *_load_pixbuf(guint16 *bil)
 104 {
 105         GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, TILE_WIDTH, TILE_HEIGHT);
 106         guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
 107         gint       stride = gdk_pixbuf_get_rowstride(pixbuf);
 108         gint       nchan  = gdk_pixbuf_get_n_channels(pixbuf);
 109
 110         for (int r = 0; r < TILE_HEIGHT; r++) {
 111                 for (int c = 0; c < TILE_WIDTH; c++) {
 112                         gint16 value = bil[r*TILE_WIDTH + c];
 113                         //guchar color = (float)(MAX(value,0))/8848 * 255;
 114                         guchar color = (float)value/8848 * 255;
 115                         pixels[r*stride + c*nchan + 0] = color;
 116                         pixels[r*stride + c*nchan + 1] = color;
 117                         pixels[r*stride + c*nchan + 2] = color;
 118                         if (nchan == 4)
 119                                 pixels[r*stride + c*nchan + 3] = 128;
 120                 }
 121         }
 122         g_debug("GisPluginSrtm: load_pixbuf %p", pixbuf);
 123         return pixbuf;
 124 }
 125 static guint _load_opengl(GdkPixbuf *pixbuf)
 126 {
 127         /* Load image */
 128         guchar *pixels = gdk_pixbuf_get_pixels(pixbuf);
 129         gint    alpha  = gdk_pixbuf_get_has_alpha(pixbuf);
 130         gint    nchan  = 4; // gdk_pixbuf_get_n_channels(pixbuf);
 131         gint    width  = gdk_pixbuf_get_width(pixbuf);
 132         gint    height = gdk_pixbuf_get_height(pixbuf);
 133
 134         /* Create Texture */
 135         guint opengl;
 136         glGenTextures(1, &opengl);
 137         glBindTexture(GL_TEXTURE_2D, opengl);
 138
 139         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 140         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 141         glTexImage2D(GL_TEXTURE_2D, 0, nchan, width, height, 0,
 142                         (alpha ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, pixels);
 143         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 144         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 145         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
 146         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
 147
 148         g_debug("GisPluginSrtm: load_opengl %d", opengl);
 149         return opengl;
 150 }
 151 static gboolean _load_tile_cb(gpointer _load)
 152 {
 153         struct _LoadTileData *load = _load;
 154         g_debug("GisPluginSrtm: _load_tile_cb: %s", load->path);
 155         GisPluginSrtm    *self   = load->self;
 156         GisTile          *tile   = load->tile;
 157         GdkPixbuf        *pixbuf = load->pixbuf;
 158         struct _TileData *data   = load->data;
 159         g_free(load->path);
 160         g_free(load);
 161
 162         if (LOAD_OPENGL)
 163                 data->opengl = _load_opengl(pixbuf);
 164
 165         tile->data = data;
 166
 167         /* Do necessasairy processing */
 168         /* TODO: Lock this and move to thread, can remove self from _load then */
 169         if (LOAD_BIL)
 170                 gis_viewer_set_height_func(self->viewer, tile, _height_func, self, TRUE);
 171
 172         /* Cleanup unneeded things */
 173         if (!LOAD_BIL)
 174                 g_free(data->bil);
 175         if (LOAD_OPENGL)
 176                 g_object_unref(pixbuf);
 177
 178         return FALSE;
 179 }
 180 static void _load_tile(GisTile *tile, gpointer _self)
 181 {
 182         GisPluginSrtm *self = _self;
 183
 184         struct _LoadTileData *load = g_new0(struct _LoadTileData, 1);
 185         load->path = gis_wms_make_local(self->wms, tile);
 186         g_debug("GisPluginSrtm: _load_tile: %s", load->path);
 187         load->self = self;
 188         load->tile = tile;
 189         load->data = g_new0(struct _TileData, 1);
 190         if (LOAD_BIL || LOAD_OPENGL)
 191                 load->data->bil = _load_bil(load->path);
 192         if (LOAD_OPENGL)
 193                 load->pixbuf = _load_pixbuf(load->data->bil);
 194
 195         g_idle_add_full(G_PRIORITY_LOW, _load_tile_cb, load, NULL);
 196 }
 197
 198 static gboolean _free_tile_cb(gpointer _data)
 199 {
 200         struct _TileData *data = _data;
 201         if (LOAD_BIL)
 202                 g_free(data->bil);
 203         if (LOAD_OPENGL)
 204                 glDeleteTextures(1, &data->opengl);
 205         g_free(data);
 206         return FALSE;
 207 }
 208 static void _free_tile(GisTile *tile, gpointer _self)
 209 {
 210         GisPluginSrtm *self = _self;
 211         g_debug("GisPluginSrtm: _free_tile: %p=%d", tile->data, *(guint*)tile->data);
 212         g_idle_add_full(G_PRIORITY_LOW, _free_tile_cb, tile->data, NULL);
 213 }
 214
 215 static gpointer _update_tiles(gpointer _self)
 216 {
 217         GisPluginSrtm *self = _self;
 218         g_mutex_lock(self->mutex);
 219         gdouble lat, lon, elev;
 220         gis_viewer_get_location(self->viewer, &lat, &lon, &elev);
 221         gis_tile_update(self->tiles,
 222                         MAX_RESOLUTION, TILE_WIDTH, TILE_WIDTH,
 223                         lat, lon, elev,
 224                         _load_tile, self);
 225         gis_tile_gc(self->tiles, time(NULL)-10,
 226                         _free_tile, self);
 227         g_mutex_unlock(self->mutex);
 228         return NULL;
 229 }
 230
 231 /*************
 232  * Callbacks *
 233  *************/
 234 static void _on_location_changed(GisViewer *viewer,
 235                 gdouble lat, gdouble lon, gdouble elev, GisPluginSrtm *self)
 236 {
 237         g_thread_create(_update_tiles, self, FALSE, NULL);
 238 }
 239
 240 static gpointer _expose(GisCallback *callback, gpointer _self)
 241 {
 242         GisPluginSrtm *self = GIS_PLUGIN_SRTM(_self);
 243         g_debug("GisPluginSrtm: expose tiles=%p data=%p",
 244                 self->tiles, self->tiles->data);
 245         if (LOAD_OPENGL)
 246                 gis_viewer_render_tiles(self->viewer, self->tiles);
 247         return NULL;
 248 }
 249
 250 /***********
 251  * Methods *
 252  ***********/
 253 GisPluginSrtm *gis_plugin_srtm_new(GisViewer *viewer)
 254 {
 255         g_debug("GisPluginSrtm: new");
 256         GisPluginSrtm *self = g_object_new(GIS_TYPE_PLUGIN_SRTM, NULL);
 257         self->viewer = g_object_ref(viewer);
 258
 259         /* Load initial tiles */
 260         _load_tile(self->tiles, self);
 261         g_thread_create(_update_tiles, self, FALSE, NULL);
 262
 263         /* Connect signals */
 264         self->sigid = g_signal_connect(self->viewer, "location-changed",
 265                         G_CALLBACK(_on_location_changed), self);
 266
 267         /* Add renderers */
 268         GisCallback *callback = gis_callback_new(_expose, self);
 269         gis_viewer_add(viewer, GIS_OBJECT(callback), GIS_LEVEL_WORLD, 0);
 270
 271         return self;
 272 }
 273
 274
 275 /****************
 276  * GObject code *
 277  ****************/
 278 /* Plugin init */
 279 static void gis_plugin_srtm_plugin_init(GisPluginInterface *iface);
 280 G_DEFINE_TYPE_WITH_CODE(GisPluginSrtm, gis_plugin_srtm, G_TYPE_OBJECT,
 281                 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
 282                         gis_plugin_srtm_plugin_init));
 283 static void gis_plugin_srtm_plugin_init(GisPluginInterface *iface)
 284 {
 285         g_debug("GisPluginSrtm: plugin_init");
 286         /* Add methods to the interface */
 287 }
 288 /* Class/Object init */
 289 static void gis_plugin_srtm_init(GisPluginSrtm *self)
 290 {
 291         g_debug("GisPluginSrtm: init");
 292         /* Set defaults */
 293         self->mutex = g_mutex_new();
 294         self->tiles = gis_tile_new(NULL, NORTH, SOUTH, EAST, WEST);
 295         self->wms   = gis_wms_new(
 296                 "http://www.nasa.network.com/elev", "srtm30", "application/bil",
 297                 "srtm/", "bil", TILE_WIDTH, TILE_HEIGHT);
 298 }
 299 static void gis_plugin_srtm_dispose(GObject *gobject)
 300 {
 301         g_debug("GisPluginSrtm: dispose");
 302         GisPluginSrtm *self = GIS_PLUGIN_SRTM(gobject);
 303         /* Drop references */
 304         if (LOAD_BIL)
 305                 gis_viewer_clear_height_func(self->viewer);
 306         if (self->viewer) {
 307                 g_signal_handler_disconnect(self->viewer, self->sigid);
 308                 g_object_unref(self->viewer);
 309                 self->viewer = NULL;
 310         }
 311         G_OBJECT_CLASS(gis_plugin_srtm_parent_class)->dispose(gobject);
 312 }
 313 static void gis_plugin_srtm_finalize(GObject *gobject)
 314 {
 315         g_debug("GisPluginSrtm: finalize");
 316         GisPluginSrtm *self = GIS_PLUGIN_SRTM(gobject);
 317         /* Free data */
 318         gis_tile_free(self->tiles, _free_tile, self);
 319         gis_wms_free(self->wms);
 320         g_mutex_free(self->mutex);
 321         G_OBJECT_CLASS(gis_plugin_srtm_parent_class)->finalize(gobject);
 322
 323 }
 324 static void gis_plugin_srtm_class_init(GisPluginSrtmClass *klass)
 325 {
 326         g_debug("GisPluginSrtm: class_init");
 327         GObjectClass *gobject_class = (GObjectClass*)klass;
 328         gobject_class->dispose  = gis_plugin_srtm_dispose;
 329         gobject_class->finalize = gis_plugin_srtm_finalize;
 330 }