Pileus Git - grits/blob - src/plugins/ridge.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 <config.h>
  19 #include <stdio.h>
  20 #include <gtk/gtk.h>
  21 #include <curl/curl.h>
  22 #include <GL/gl.h>
  23
  24 #include <gis/gis.h>
  25
  26 #include "ridge.h"
  27
  28
  29 /*********************
  30  * Overlay constants *
  31  *********************/
  32 enum {
  33         LAYER_TOPO,
  34         LAYER_COUNTY,
  35         LAYER_RIVERS,
  36         LAYER_HIGHWAYS,
  37         LAYER_CITY,
  38         LAYER_COUNT
  39 };
  40
  41 typedef struct {
  42         gchar *name;
  43         gchar *fmt;
  44         gboolean enabled;
  45         float z;
  46         guint tex;
  47 } layer_t;
  48
  49 static layer_t layers[] = {
  50         [LAYER_TOPO]     = {"Topo",     "Overlays/Topo/Short/%s_Topo_Short.jpg",         TRUE,  1, 0},
  51         [LAYER_COUNTY]   = {"Counties", "Overlays/County/Short/%s_County_Short.gif",     TRUE,  3, 0},
  52         [LAYER_RIVERS]   = {"Rivers",   "Overlays/Rivers/Short/%s_Rivers_Short.gif",     FALSE, 4, 0},
  53         [LAYER_HIGHWAYS] = {"Highways", "Overlays/Highways/Short/%s_Highways_Short.gif", FALSE, 5, 0},
  54         [LAYER_CITY]     = {"Cities",   "Overlays/Cities/Short/%s_City_Short.gif",       TRUE,  6, 0},
  55 };
  56
  57
  58 /***********
  59  * Helpers *
  60  ***********/
  61 /*
  62  * Load an image into an OpenGL texture
  63  * \param  filename  Path to the image file
  64  * \return The OpenGL identifier for the texture
  65  */
  66 void load_texture(GisPluginRidge *self, layer_t *layer, gchar *filename)
  67 {
  68         gis_opengl_begin(self->opengl);
  69
  70         /* Load image */
  71         GError *error = NULL;
  72         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, &error);
  73         if (!pixbuf || error) {
  74                 g_warning("Failed to load texture: %s", filename);
  75                 return;
  76         }
  77         guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
  78         int        width  = gdk_pixbuf_get_width(pixbuf);
  79         int        height = gdk_pixbuf_get_height(pixbuf);
  80         int        format = gdk_pixbuf_get_has_alpha(pixbuf) ? GL_RGBA : GL_RGB;
  81
  82         /* Create Texture */
  83         glDeleteTextures(1, &layer->tex);
  84         glGenTextures(1, &layer->tex);
  85         glBindTexture(GL_TEXTURE_2D, layer->tex); // 2d texture (x and y size)
  86
  87         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  88         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
  89                         format, GL_UNSIGNED_BYTE, pixels);
  90         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  91         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  92
  93         char *base = g_path_get_basename(filename);
  94         g_debug("GisPluginRidge: load_texture - "
  95                 "w=%-3d  h=%-3d  fmt=%x  px=(%02x,%02x,%02x,%02x)  img=%s",
  96                 width, height, format, pixels[0], pixels[1], pixels[2], pixels[3],
  97                 base);
  98         g_free(base);
  99
 100         gis_opengl_end(self->opengl);
 101
 102         g_object_unref(pixbuf);
 103
 104         /* Redraw */
 105         gis_opengl_redraw(self->opengl);
 106 }
 107
 108
 109 /*****************
 110  * ASync helpers *
 111  *****************/
 112 typedef struct {
 113         GisPluginRidge *self;
 114         layer_t *layer;
 115 } cached_t;
 116 void cached_cb(gchar *filename, gboolean updated, gpointer _udata)
 117 {
 118         cached_t *udata = _udata;
 119         load_texture(udata->self, udata->layer, filename);
 120         g_free(udata);
 121 }
 122
 123
 124 /*************
 125  * callbacks *
 126  *************/
 127 static void on_site_changed(GisView *view, gchar *site, GisPluginRidge *self)
 128 {
 129         g_debug("GisPluginRidge: on_site_changed - site=%s", site);
 130         if (site == NULL || site[0] == '\0')
 131                 return;
 132         for (int i = 0; i < LAYER_COUNT; i++) {
 133                 gchar *base = "http://radar.weather.gov/ridge/";
 134                 gchar *path  = g_strdup_printf(layers[i].fmt, site+1);
 135                 cached_t *udata = g_malloc(sizeof(cached_t));
 136                 udata->self  = self;
 137                 udata->layer = &layers[i];
 138                 cache_file(base, path, GIS_ONCE, NULL, cached_cb, udata);
 139                 g_free(path);
 140         }
 141 }
 142
 143 void toggle_layer(GtkToggleButton *check, GisPluginRidge *self)
 144 {
 145         layer_t *layer = g_object_get_data(G_OBJECT(check), "layer");
 146         layer->enabled = gtk_toggle_button_get_active(check);
 147         gis_opengl_redraw(self->opengl);
 148 }
 149
 150
 151 /***********
 152  * Methods *
 153  ***********/
 154 GisPluginRidge *gis_plugin_ridge_new(GisWorld *world, GisView *view, GisOpenGL *opengl)
 155 {
 156         GisPluginRidge *self = g_object_new(GIS_TYPE_PLUGIN_RIDGE, NULL);
 157         self->world  = world;
 158         self->view   = view;
 159         self->opengl = opengl;
 160
 161         g_signal_connect(view, "site-changed", G_CALLBACK(on_site_changed), self);
 162         on_site_changed(view, gis_view_get_site(view), self);
 163
 164         return self;
 165 }
 166
 167 static GtkWidget *gis_plugin_ridge_get_config(GisPlugin *_self)
 168 {
 169         GisPluginRidge *self = GIS_PLUGIN_RIDGE(_self);
 170         GtkWidget *body = gtk_alignment_new(0.5, 0, 0, 0);
 171         GtkWidget *hbox = gtk_hbox_new(FALSE, 10);
 172         for (int i = 0; i < LAYER_COUNT; i++) {
 173                 GtkWidget *check = gtk_check_button_new_with_label(layers[i].name);
 174                 gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(check), layers[i].enabled);
 175                 gtk_box_pack_start(GTK_BOX(hbox), check, FALSE, TRUE, 0);
 176                 g_object_set_data(G_OBJECT(check), "layer", &layers[i]);
 177                 g_signal_connect(check, "toggled", G_CALLBACK(toggle_layer), self);
 178         }
 179         gtk_container_add(GTK_CONTAINER(body), hbox);
 180         return body;
 181 }
 182
 183 static void gis_plugin_ridge_expose(GisPlugin *_self)
 184 {
 185         GisPluginRidge *self = GIS_PLUGIN_RIDGE(_self);
 186
 187         g_debug("GisPluginRidge: expose");
 188         glEnable(GL_TEXTURE_2D);
 189         glColor4f(1,1,1,1);
 190
 191         for (int i = 0; i < LAYER_COUNT; i++) {
 192                 if (!layers[i].enabled)
 193                         continue;
 194                 glBindTexture(GL_TEXTURE_2D, layers[i].tex);
 195                 glBegin(GL_POLYGON);
 196                 glTexCoord2f(0.0, 0.0); glVertex3f(240*1000*-1.0, 282*1000* 1.0, layers[i].z);
 197                 glTexCoord2f(0.0, 1.0); glVertex3f(240*1000*-1.0, 282*1000*-1.0, layers[i].z);
 198                 glTexCoord2f(1.0, 1.0); glVertex3f(240*1000* 1.0, 282*1000*-1.0, layers[i].z);
 199                 glTexCoord2f(1.0, 0.0); glVertex3f(240*1000* 1.0, 282*1000* 1.0, layers[i].z);
 200                 glEnd();
 201         }
 202 }
 203
 204
 205 /****************
 206  * GObject code *
 207  ****************/
 208 /* Plugin init */
 209 static void gis_plugin_ridge_plugin_init(GisPluginInterface *iface);
 210 G_DEFINE_TYPE_WITH_CODE(GisPluginRidge, gis_plugin_ridge, G_TYPE_OBJECT,
 211                 G_IMPLEMENT_INTERFACE(GIS_TYPE_PLUGIN,
 212                         gis_plugin_ridge_plugin_init));
 213 static void gis_plugin_ridge_plugin_init(GisPluginInterface *iface)
 214 {
 215         g_debug("GisPluginRidge: plugin_init");
 216         /* Add methods to the interface */
 217         iface->expose     = gis_plugin_ridge_expose;
 218         iface->get_config = gis_plugin_ridge_get_config;
 219 }
 220 /* Class/Object init */
 221 static void gis_plugin_ridge_init(GisPluginRidge *self)
 222 {
 223         g_debug("GisPluginRidge: init");
 224         /* Set defaults */
 225 }
 226 static void gis_plugin_ridge_dispose(GObject *gobject)
 227 {
 228         g_debug("GisPluginRidge: dispose");
 229         GisPluginRidge *self = GIS_PLUGIN_RIDGE(gobject);
 230         /* Drop references */
 231         G_OBJECT_CLASS(gis_plugin_ridge_parent_class)->dispose(gobject);
 232 }
 233 static void gis_plugin_ridge_finalize(GObject *gobject)
 234 {
 235         g_debug("GisPluginRidge: finalize");
 236         GisPluginRidge *self = GIS_PLUGIN_RIDGE(gobject);
 237         /* Free data */
 238         G_OBJECT_CLASS(gis_plugin_ridge_parent_class)->finalize(gobject);
 239
 240 }
 241 static void gis_plugin_ridge_class_init(GisPluginRidgeClass *klass)
 242 {
 243         g_debug("GisPluginRidge: class_init");
 244         GObjectClass *gobject_class = (GObjectClass*)klass;
 245         gobject_class->dispose  = gis_plugin_ridge_dispose;
 246         gobject_class->finalize = gis_plugin_ridge_finalize;
 247 }
 248