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