Pileus Git - grits/blob - src/plugin-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 <gtk/gtk.h>
  20 #include <curl/curl.h>
  21 #include <GL/gl.h>
  22
  23 #include <stdio.h>
  24
  25 #include "aweather-gui.h"
  26 #include "data.h"
  27
  28 enum {
  29         LAYER_TOPO,
  30         LAYER_COUNTY,
  31         LAYER_RIVERS,
  32         LAYER_HIGHWAYS,
  33         LAYER_CITY,
  34         LAYER_COUNT
  35 };
  36
  37 typedef struct {
  38         gchar *fmt;
  39         float z;
  40         guint tex;
  41 } layer_t;
  42
  43 static layer_t layers[] = {
  44         [LAYER_TOPO]     = { "Overlays/" "Topo/"     "Short/" "%s_Topo_Short.jpg",     1, 0 },
  45         [LAYER_COUNTY]   = { "Overlays/" "County/"   "Short/" "%s_County_Short.gif",   3, 0 },
  46         [LAYER_RIVERS]   = { "Overlays/" "Rivers/"   "Short/" "%s_Rivers_Short.gif",   4, 0 },
  47         [LAYER_HIGHWAYS] = { "Overlays/" "Highways/" "Short/" "%s_Highways_Short.gif", 5, 0 },
  48         [LAYER_CITY]     = { "Overlays/" "Cities/"   "Short/" "%s_City_Short.gif",     6, 0 },
  49 };
  50
  51 static AWeatherGui *gui = NULL;
  52
  53 /**
  54  * Load an image into an OpenGL texture
  55  * \param  filename  Path to the image file
  56  * \return The OpenGL identifier for the texture
  57  */
  58 void load_texture(gchar *filename, gpointer _layer)
  59 {
  60         layer_t *layer = _layer;
  61         aweather_gui_gl_begin(gui);
  62
  63         /* Load image */
  64         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
  65         if (!pixbuf)
  66                 g_warning("Failed to load texture: %s", filename);
  67         guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
  68         int        width  = gdk_pixbuf_get_width(pixbuf);
  69         int        height = gdk_pixbuf_get_height(pixbuf);
  70         int        format = gdk_pixbuf_get_has_alpha(pixbuf) ? GL_RGBA : GL_RGB;
  71
  72         /* Create Texture */
  73         glGenTextures(1, &layer->tex);
  74         glBindTexture(GL_TEXTURE_2D, layer->tex); // 2d texture (x and y size)
  75
  76         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  77         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
  78                         format, GL_UNSIGNED_BYTE, pixels);
  79         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  80         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  81
  82         g_message("loaded image:  w=%-3d  h=%-3d  fmt=%x  px=(%02x,%02x,%02x,%02x)  img=%s",
  83                 width, height, format, pixels[0], pixels[1], pixels[2], pixels[3],
  84                 g_path_get_basename(filename));
  85
  86         aweather_gui_gl_end(gui);
  87
  88         /* Redraw */
  89         gtk_widget_queue_draw(aweather_gui_get_widget(gui, "drawing"));
  90 }
  91
  92 static void set_site(AWeatherView *view, gchar *site, gpointer user_data)
  93 {
  94         g_message("location changed to %s", site);
  95         for (int i = 0; i < LAYER_COUNT; i++) {
  96                 gchar *base = "http://radar.weather.gov/ridge/";
  97                 gchar *path  = g_strdup_printf(layers[i].fmt, site);
  98                 cache_file(base, path, load_texture, &layers[i]);
  99                 g_free(path);
 100         }
 101 }
 102
 103 static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
 104 {
 105         g_message("ridge:expose");
 106         glPushMatrix();
 107         glEnable(GL_TEXTURE_2D);
 108         glColor4f(1,1,1,1);
 109
 110         for (int i = 0; i < LAYER_COUNT; i++) {
 111                 glBindTexture(GL_TEXTURE_2D, layers[i].tex);
 112
 113                 glBegin(GL_POLYGON);
 114                 glTexCoord2f(0.0, 0.0); glVertex3f(250*1000*-1.0, 250*1000* 1.0, layers[i].z);
 115                 glTexCoord2f(0.0, 1.0); glVertex3f(250*1000*-1.0, 250*1000*-1.0, layers[i].z);
 116                 glTexCoord2f(1.0, 1.0); glVertex3f(250*1000* 1.0, 250*1000*-1.0, layers[i].z);
 117                 glTexCoord2f(1.0, 0.0); glVertex3f(250*1000* 1.0, 250*1000* 1.0, layers[i].z);
 118                 glEnd();
 119         }
 120
 121         glPopMatrix();
 122         return FALSE;
 123 }
 124
 125 gboolean ridge_init(AWeatherGui *_gui)
 126 {
 127         gui = _gui;
 128         GtkDrawingArea *drawing = GTK_DRAWING_AREA(aweather_gui_get_widget(gui, "drawing"));
 129         AWeatherView   *view    = aweather_gui_get_view(gui);
 130
 131         /* Set up OpenGL Stuff */
 132         g_signal_connect(drawing, "expose-event",     G_CALLBACK(expose),    NULL);
 133         g_signal_connect(view,    "location-changed", G_CALLBACK(set_site),  NULL);
 134
 135         return TRUE;
 136 }