Pileus Git - grits/blob - src/plugin-ridge.c

   1 #include <config.h>
   2 #include <gtk/gtk.h>
   3 #include <curl/curl.h>
   4 #include <GL/gl.h>
   5
   6 #include <stdio.h>
   7
   8 #include "aweather-gui.h"
   9
  10 enum {
  11         LAYER_TOPO,
  12         LAYER_COUNTY,
  13         LAYER_RIVERS,
  14         LAYER_HIGHWAYS,
  15         LAYER_CITY,
  16         LAYER_COUNT
  17 };
  18
  19 static struct {
  20         char *fmt;
  21         float z;
  22         guint tex;
  23 } layers[] = {
  24         [LAYER_TOPO]     = { "Overlays/" "Topo/"     "Short/" "%s_Topo_Short.jpg",     1, 0 },
  25         [LAYER_COUNTY]   = { "Overlays/" "County/"   "Short/" "%s_County_Short.gif",   3, 0 },
  26         [LAYER_RIVERS]   = { "Overlays/" "Rivers/"   "Short/" "%s_Rivers_Short.gif",   4, 0 },
  27         [LAYER_HIGHWAYS] = { "Overlays/" "Highways/" "Short/" "%s_Highways_Short.gif", 5, 0 },
  28         [LAYER_CITY]     = { "Overlays/" "Cities/"   "Short/" "%s_City_Short.gif",     6, 0 },
  29 };
  30
  31 static CURL *curl_handle;
  32
  33 /**
  34  * Cache a image from Ridge to the local disk
  35  * \param  path  Path to the Ridge file, starting after /ridge/
  36  * \return The local path to the cached image
  37  */
  38 char *cache_image(char *path)
  39 {
  40         gchar base[] = "http://radar.weather.gov/ridge/";
  41         gchar *url   = g_strconcat(base, path, NULL);
  42         gchar *local = g_build_filename(g_get_user_cache_dir(), PACKAGE, path, NULL);
  43         if (!g_file_test(local, G_FILE_TEST_EXISTS)) {
  44                 if (!g_file_test(g_path_get_dirname(local), G_FILE_TEST_IS_DIR)) {
  45                         //g_printerr("Making directory %s\n", g_path_get_dirname(local));
  46                         g_mkdir_with_parents(g_path_get_dirname(local), 0755);
  47                 }
  48                 //g_printerr("Fetching image %s -> %s\n", url, local);
  49                 long http_code;
  50                 FILE *cached_image = fopen(local, "w+");
  51                 curl_easy_setopt(curl_handle, CURLOPT_URL, url);
  52                 curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, cached_image);
  53                 curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, NULL);
  54                 curl_easy_perform(curl_handle);
  55                 curl_easy_getinfo(curl_handle, CURLINFO_RESPONSE_CODE, &http_code);
  56                 fflush(cached_image);
  57                 if (http_code != 200) {
  58                         g_message("http %ld while fetching %s", http_code, url);
  59                         remove(local);
  60                         return NULL;
  61                 }
  62         }
  63         return local;
  64 }
  65
  66 /**
  67  * Load an image into an OpenGL texture
  68  * \param  filename  Path to the image file
  69  * \return The OpenGL identifier for the texture
  70  */
  71 guint load_texture(char *filename)
  72 {
  73         /* Load image */
  74         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
  75         guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
  76         int        width  = gdk_pixbuf_get_width(pixbuf);
  77         int        height = gdk_pixbuf_get_height(pixbuf);
  78         int        format = gdk_pixbuf_get_has_alpha(pixbuf) ? GL_RGBA : GL_RGB;
  79
  80         /* Create Texture */
  81         guint id;
  82         glGenTextures(1, &id);
  83         glBindTexture(GL_TEXTURE_2D, id);   // 2d texture (x and y size)
  84
  85         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  86         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
  87                         format, GL_UNSIGNED_BYTE, pixels);
  88         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  89         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  90
  91         g_message("loaded image:  w=%-3d  h=%-3d  fmt=%x  px=(%02x,%02x,%02x,%02x)  img=%s",
  92                 width, height, format, pixels[0], pixels[1], pixels[2], pixels[3],
  93                 g_path_get_basename(filename));
  94         return id;
  95 }
  96
  97 static void set_site(AWeatherView *view, char *site, AWeatherGui *gui)
  98 {
  99         g_message("location changed to %s", site);
 100         aweather_gui_gl_begin(gui);
 101         for (int i = 0; i < LAYER_COUNT; i++) {
 102                 if (layers[i].tex != 0)
 103                         continue;
 104                 char *path  = g_strdup_printf(layers[i].fmt, site);
 105                 char *local = cache_image(path);
 106                 layers[i].tex = load_texture(local);
 107                 g_free(local);
 108                 g_free(path);
 109         }
 110         aweather_gui_gl_end(gui);
 111 }
 112
 113 static gboolean expose(GtkWidget *da, GdkEventExpose *event, AWeatherGui *gui)
 114 {
 115         //g_message("ridge:expose");
 116         aweather_gui_gl_begin(gui);
 117         glPushMatrix();
 118         glEnable(GL_TEXTURE_2D);
 119         glColor4f(1,1,1,1);
 120
 121         for (int i = 0; i < LAYER_COUNT; i++) {
 122                 glBindTexture(GL_TEXTURE_2D, layers[i].tex);
 123
 124                 glBegin(GL_POLYGON);
 125                 glTexCoord2f(0.0, 0.0); glVertex3f(500*1000*-1.0, 500*1000* 1.0, layers[i].z);
 126                 glTexCoord2f(0.0, 1.0); glVertex3f(500*1000*-1.0, 500*1000*-1.0, layers[i].z);
 127                 glTexCoord2f(1.0, 1.0); glVertex3f(500*1000* 1.0, 500*1000*-1.0, layers[i].z);
 128                 glTexCoord2f(1.0, 0.0); glVertex3f(500*1000* 1.0, 500*1000* 1.0, layers[i].z);
 129                 glEnd();
 130         }
 131
 132         glPopMatrix();
 133         aweather_gui_gl_end(gui);
 134         return FALSE;
 135 }
 136
 137 gboolean ridge_init(AWeatherGui *gui)
 138 {
 139         GtkDrawingArea *drawing = aweather_gui_get_drawing(gui);
 140         AWeatherView *view = aweather_gui_get_view(gui);
 141
 142         /* Set up OpenGL Stuff */
 143         g_signal_connect(drawing, "expose-event",     G_CALLBACK(expose),    gui);
 144         g_signal_connect(view,    "location-changed", G_CALLBACK(set_site),  gui);
 145
 146         curl_global_init(CURL_GLOBAL_ALL);
 147         curl_handle = curl_easy_init();
 148
 149         return TRUE;
 150 }