renaming to plugins

[grits] / src / plugin-ridge.c

diff --git a/src/plugin-ridge.c b/src/plugin-ridge.c
new file mode 100644 (file)
index 0000000..3e08d00
--- /dev/null
+++ b/src/plugin-ridge.c
@@ -0,0 +1,142 @@
+#include <config.h>
+#include <gtk/gtk.h>
+#include <curl/curl.h>
+#include <GL/gl.h>
+
+#include <stdio.h>
+
+enum {
+       LAYER_TOPO,
+       LAYER_COUNTY,
+       LAYER_RIVERS,
+       LAYER_HIGHWAYS,
+       LAYER_CITY,
+       LAYER_COUNT
+};
+
+static struct {
+       char *fmt;
+       float z;
+       guint tex;
+} layers[] = {
+       [LAYER_TOPO]     = { "Overlays/" "Topo/"     "Short/" "%s_Topo_Short.jpg",     1, 0 },
+       [LAYER_COUNTY]   = { "Overlays/" "County/"   "Short/" "%s_County_Short.gif",   3, 0 },
+       [LAYER_RIVERS]   = { "Overlays/" "Rivers/"   "Short/" "%s_Rivers_Short.gif",   4, 0 },
+       [LAYER_HIGHWAYS] = { "Overlays/" "Highways/" "Short/" "%s_Highways_Short.gif", 5, 0 },
+       [LAYER_CITY]     = { "Overlays/" "Cities/"   "Short/" "%s_City_Short.gif",     6, 0 },
+};
+
+static CURL *curl_handle;
+
+
+/**
+ * Cache a image from Ridge to the local disk
+ * \param  path  Path to the Ridge file, starting after /ridge/
+ * \return The local path to the cached image
+ */
+char *cache_image(char *path)
+{
+       gchar base[] = "http://radar.weather.gov/ridge/";
+       gchar *url   = g_strconcat(base, path, NULL);
+       gchar *local = g_build_filename(g_get_user_cache_dir(), PACKAGE, path, NULL);
+       if (!g_file_test(local, G_FILE_TEST_EXISTS)) {
+               if (!g_file_test(g_path_get_dirname(local), G_FILE_TEST_IS_DIR)) {
+                       //g_printerr("Making directory %s\n", g_path_get_dirname(local));
+                       g_mkdir_with_parents(g_path_get_dirname(local), 0755);
+               }
+               //g_printerr("Fetching image %s -> %s\n", url, local);
+               long http_code;
+               FILE *cached_image = fopen(local, "w+");
+               curl_easy_setopt(curl_handle, CURLOPT_URL, url);
+               curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, cached_image);
+               curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, NULL);
+               curl_easy_perform(curl_handle);
+               curl_easy_getinfo(curl_handle, CURLINFO_RESPONSE_CODE, &http_code);
+               fflush(cached_image);
+               if (http_code != 200) {
+                       g_message("http %ld while fetching %s", http_code, url);
+                       remove(local);
+                       return NULL;
+               }
+       }
+       return local;
+}
+
+/**
+ * Load an image into an OpenGL texture
+ * \param  filename  Path to the image file
+ * \return The OpenGL identifier for the texture
+ */
+guint load_texture(char *filename)
+{
+       /* Load image */
+       GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
+       guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
+       int        width  = gdk_pixbuf_get_width(pixbuf);
+       int        height = gdk_pixbuf_get_height(pixbuf);
+       int        format = gdk_pixbuf_get_has_alpha(pixbuf) ? GL_RGBA : GL_RGB;
+
+       /* Create Texture */
+       guint id;
+       glGenTextures(1, &id);
+       glBindTexture(GL_TEXTURE_2D, id);   // 2d texture (x and y size)
+
+       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
+                       format, GL_UNSIGNED_BYTE, pixels);
+       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+       g_message("loaded image:  w=%-3d  h=%-3d  fmt=%x  px=(%02x,%02x,%02x,%02x)  img=%s",
+               width, height, format, pixels[0], pixels[1], pixels[2], pixels[3],
+               g_path_get_basename(filename));
+       return id;
+}
+
+static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
+{
+       g_message("ridge:expose");
+       glPushMatrix();
+       glEnable(GL_TEXTURE_2D);
+       glColor4f(1,1,1,1);
+
+       for (int i = 0; i < LAYER_COUNT; i++) {
+               glBindTexture(GL_TEXTURE_2D, layers[i].tex);
+
+               glBegin(GL_POLYGON);
+               glTexCoord2f(0.0, 0.0); glVertex3f(500*1000*-1.0, 500*1000* 1.0, layers[i].z);
+               glTexCoord2f(0.0, 1.0); glVertex3f(500*1000*-1.0, 500*1000*-1.0, layers[i].z);
+               glTexCoord2f(1.0, 1.0); glVertex3f(500*1000* 1.0, 500*1000*-1.0, layers[i].z);
+               glTexCoord2f(1.0, 0.0); glVertex3f(500*1000* 1.0, 500*1000* 1.0, layers[i].z);
+               glEnd();
+       }
+
+       glPopMatrix();
+       return FALSE;
+}
+
+static gboolean configure(GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
+{
+       for (int i = 0; i < LAYER_COUNT; i++) {
+               if (layers[i].tex != 0)
+                       continue;
+               char *path  = g_strdup_printf(layers[i].fmt, "IND");
+               char *local = cache_image(path);
+               layers[i].tex = load_texture(local);
+               g_free(local);
+               g_free(path);
+       }
+       return FALSE;
+}
+
+gboolean ridge_init(GtkDrawingArea *drawing, GtkNotebook *config)
+{
+       /* Set up OpenGL Stuff */
+       g_signal_connect(drawing, "expose-event",    G_CALLBACK(expose),    NULL);
+       g_signal_connect(drawing, "configure-event", G_CALLBACK(configure), NULL);
+
+       curl_global_init(CURL_GLOBAL_ALL);
+       curl_handle = curl_easy_init();
+
+       return TRUE;
+}